We have entered into an at the market offering agreement (the “Sales Agreement”) with H.C. Wainwright & Co., LLC (“Wainwright”), dated May 23, 2023, relating to the sale of shares of our Class A common stock, par value $0.0001 per share (“Class A common stock”) offered by this prospectus supplement. In accordance with the terms of the Sales Agreement, under this prospectus supplement we may offer and sell shares of our Class A common stock having an aggregate offering price of up to $15,000,000 from time to time through Wainwright, acting as sales agent or principal.

Sales of our Class A common stock, if any, under this prospectus supplement will be made by any method permitted that is deemed an “at the market offering” as defined in Rule 415(a)(4) under the Securities Act of 1933, as amended (the “Securities Act”). If we and Wainwright agree on any method of distribution other than sales of shares of our Class A common stock on or through the Nasdaq Global Market or another existing trading market in the United States at market prices, we will file a prospectus supplement providing all information about such offering as required by Rule 424(b) under the Securities Act. Wainwright is not required to sell any specific amount, but will act as our sales agent using commercially reasonable efforts consistent with their normal trading and sales practices on mutually agreed terms between Wainwright and us. There is no arrangement for funds to be received in any escrow, trust or similar arrangement.

Wainwright will be entitled to compensation at a commission rate equal to 3.0% of the gross sales price of the shares of our Class A common stock sold through it pursuant to the Sales Agreement. See “Plan of Distribution” beginning on page S-14 for additional information regarding the compensation to be paid to Wainwright. In connection with the sale of the Class A common stock on our behalf, Wainwright may be deemed to be an “underwriter” within the meaning of the Securities Act and the compensation of Wainwright may be deemed to be underwriting commissions or discounts. We have also agreed to provide indemnification and contribution to Wainwright with respect to certain liabilities, including liabilities under the Securities Act.

You should carefully read this prospectus supplement and any prospectus supplement before you invest. You should also read the documents we refer to in the “Where You Can Find More Information” section of this prospectus supplement for information on us and our financial statements.

We are an “emerging growth company” and a “smaller reporting company” under applicable federal securities laws and will be subject to reduced reporting requirements. This prospectus supplement complies with the requirements that apply to an issuer that is an emerging growth company. We have two classes of common stock: Class A common stock and Class V common stock. Each share of Class V common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by stockholders generally. Holders of Class A common stock and Class V common stock vote together as a single class on all matters presented to our stockholders for their vote or approval, except as otherwise required by applicable law or by our second amended and restated certificate of incorporation (as amended, the “second amended and restated certificate of incorporation”). Q Power LLC, which is controlled by Greg Beard, our Chairman and Chief Executive Officer, and Bill Spence, together with Messrs. Beard and Spence, held approximately 39.4% of the total voting stock outstanding as of May 5, 2023, including 100% of the Class V common stock outstanding, which votes together with the Class A common stock as a single class.

Our Class A common stock is listed on the Nasdaq Global Market under the symbol “SDIG.” On May 19, 2023, the closing price of our Class A common stock was $6.45 per share. As of May 19, 2023, the aggregate market value of our common stock held by our non-affiliates, as calculated pursuant to the rules of the Securities and Exchange Commission (the “SEC”), was approximately $53.6 million, based upon 4,742,615 shares of our outstanding common stock held by non-affiliates at the per share price of $11.30, the closing sale price of our Class A common stock on The Nasdaq Global Market on April 18, 2023 (as adjusted for the Reverse Stock Split). Pursuant to General Instruction I.B.6 of Form S-3, in no event will we sell securities in a public offering with a value exceeding more than one-third of our “public float” (i.e., the market value of our common stock held by our non-affiliates) in any 12-month period so long as our public float remains below $75.0 million. We have not sold any securities in reliance on General Instruction I.B.6 of Form S-3 during the 12 calendar months prior to and including the date of this prospectus.

Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

Investing in our Class A common stock involves risks. See “Risk Factors” beginning on page S-8 and in the documents we file with the SEC that are incorporated by reference into this prospectus supplement to read about factors you should consider before buying shares of our Class A common stock.

This prospectus supplement is part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the “SEC”) utilizing a “shelf” registration process. Under this shelf registration process, we may offer and sell shares of our Class A common stock having an aggregate offering price up to $15,000,000, from time to time, in one or more offerings under this prospectus supplement at prices and on terms to be determined by market conditions at the time of offering.

We provide information to you about this offering of our Class A common stock in two separate documents that are bound together: (1) this prospectus supplement, which describes the specific details regarding this offering; and (2) the accompanying base prospectus, which provides general information, some of which may not apply to this offering. Generally, when we refer to this “prospectus supplement,” we are referring to both documents combined. If information in this prospectus supplement is inconsistent with the accompanying base prospectus, you should rely on this prospectus supplement. To the extent there is a conflict between the information contained in this prospectus supplement, on the one hand, and the information contained in any document incorporated by reference in this prospectus supplement, on the other hand, you should rely on the information in this prospectus supplement. If any statement in one of these documents is inconsistent with a statement in another document having a later date—for example, a document incorporated by reference in this prospectus supplement—the statement in the document having the later date modifies or supersedes the earlier statement.

We have not, and Wainwright has not, authorized anyone to provide you with information other than that contained in this prospectus supplement, the accompanying base prospectus and any free writing prospectus. We are not, and Wainwright is not, making an offer to sell or soliciting any offer to buy these securities in any jurisdiction where the offer or sale is not permitted or in which the person making that offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation. You should assume that the information appearing in this prospectus supplement, the accompanying base prospectus, the documents incorporated by reference herein and therein and any free writing prospectus that we have authorized for use in connection with this offering is accurate only as of the date of those respective documents. Our business, financial condition, results of operations and prospects may have changed since those dates. You should read this prospectus supplement, the accompanying base prospectus, the documents incorporated by reference herein and therein and any free writing prospectus that we have authorized for use in connection with this offering in their entirety before making an investment decision.

Before buying any of the Class A common stock that we are offering, we urge you to carefully read this prospectus supplement, the accompanying base prospectus and all of the information incorporated by reference herein and therein, as well as the additional information described under the headings “Where You Can Find More Information” and “Incorporation of Certain Information by Reference.” This prospectus supplement contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus supplement is a part, and you may obtain copies of those documents as described below under the heading “Where You Can Find More Information.” These documents contain important information that you should consider when making your investment decision.

We are offering to sell, and seeking offers to buy, shares of Class A common stock only in jurisdictions where offers and sales are permitted. The distribution of this prospectus supplement and the offering of the Class A common stock in certain jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus supplement must inform themselves about, and observe any restrictions relating to, the offering of the Class A common stock and the distribution of this prospectus supplement outside the United States. This prospectus supplement does not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to buy, any securities offered by this prospectus supplement by any person in any jurisdiction in which it is unlawful for such person to make such an offer or solicitation.

This prospectus supplement contains forward-looking statements that are subject to a number of risks and uncertainties, many of which are beyond our control. See “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” appearing in this prospectus supplement and in the documents we file with the SEC that are incorporated by reference into this prospectus supplement.

The market data and certain other statistical information used or incorporated by reference into this prospectus supplement are based on independent industry publications, publicly available information, business organizations, government publications and other published independent sources. Some data is also based on our good faith estimates. Although we believe these third-party sources are reliable as of their respective dates, we have not independently verified the accuracy or completeness of this information. Market share data is subject to change and may be limited by the availability of raw data, the voluntary nature of the data gathering process and other limitations in any statistical survey of market share data. Accordingly, you are cautioned not to place undue reliance on such market share data or any other such estimates. The industry in which we operate is subject to a high degree of uncertainty and risk due to a variety of factors, including those described in the section entitled “Risk Factors” appearing in this prospectus supplement and in the documents we file with the SEC that are incorporated by reference into this prospectus supplement. These and other factors could cause results to differ materially from those expressed in these publications.

We rely on various trade names that we use in connection with the operation of our business. This prospectus supplement may also contain trademarks, service marks and trade names of third parties, which are the property of their respective owners. Our use or display of third parties’ trademarks, service marks, trade names or products in this prospectus supplement is not intended to, and does not imply a relationship with, or endorsement or sponsorship by us. Solely for convenience, the trademarks, service marks and trade names referred to in this prospectus supplement may appear without the ®, TM or SM symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or the right of the applicable licensor to these trademarks, service marks and trade names.

Certain monetary amounts, percentages and other figures included in this prospectus supplement have been subject to rounding adjustments. Percentage amounts included in this prospectus supplement have not in all cases been calculated on the basis of such rounded figures, but on the basis of such amounts prior to rounding. For this reason, percentage amounts in this prospectus supplement may vary from those obtained by performing the same calculations using the figures in our combined financial statements included elsewhere in this prospectus supplement. Certain other amounts that appear in this prospectus supplement may not sum due to rounding.

On May 15, 2023, we effected a 1-for-10 reverse stock split of the shares of our Class A common stock and our Class V common stock, par value $0.0001 per share (the “Class V common stock”) (the “Reverse Stock Split”). Every 10 shares of issued and outstanding Class A common stock and Class V common stock were automatically combined into one issued and outstanding share of Class A common stock or Class V common stock, as applicable. Any fractional shares that would otherwise have resulted from the Reverse Stock Split were rounded up to the next whole number. Unless otherwise indicated, the number of shares of Class A common stock and Class V common stock presented in this prospectus supplement is adjusted to reflect the Reverse Stock Split.

We are subject to the informational requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and in accordance therewith file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information regarding registrants that file electronically with the SEC. The website address of the SEC is www.sec.gov.

We make available free of charge on or through our website at www.ir.strongholddigitalmining.com, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with or otherwise furnish it to the SEC.

We have filed with the SEC a registration statement under the Securities Act of 1933, as amended (the “Securities Act”), relating to the offering of these securities. The registration statement, including the attached exhibits, contains additional relevant information about us and the securities. This prospectus supplement does not contain all of the information set forth in the registration statement. You can obtain a copy of the registration statement for free at www.sec.gov. The registration statement and the documents referred to below under “Incorporation of Certain Information By Reference” are also available on our website, www.ir.strongholddigitalmining.com.

We have not incorporated by reference into this prospectus supplement the information on our website, and you should not consider it to be a part of this prospectus supplement.

The SEC allows us to “incorporate by reference” into this prospectus supplement the information we file with the SEC. This means that we can disclose important information to you by referring you to those documents without restating that information in this document. The information incorporated by reference into this prospectus supplement is considered to be part of this prospectus supplement, and information in documents that we file later with the SEC will automatically update and supersede information contained in documents filed earlier with the SEC or contained in this prospectus supplement. We incorporate by reference in this prospectus supplement the documents listed below and all documents that we may subsequently file with the SEC under Sections 13(a), 13(c), 14, or 15(d) of the Exchange Act, after the date on which the registration statement was initially filed with the SEC (including all such documents that we may file with the SEC after the date the registration statement was initially filed and prior to the effectiveness of the registration statement) until all offerings under the registration statement of which this prospectus supplement forms a part are completed or terminated, provided, however, that we are not incorporating, in each case, any documents or information deemed to have been furnished and not filed in accordance with SEC rules:

We will provide to each person, including any beneficial owner, to whom a copy of this prospectus supplement is delivered, a copy of any or all of the information that we have incorporated by reference into this prospectus supplement. We will provide this information upon written or oral request at no cost to the requester. Requests for these documents should be directed to Stronghold Digital Mining, Inc., 595 Madison Avenue, 28th Floor, New York, New York 10022, telephone (845) 579-5992. We also maintain a website at www.strongholddigitalmining.com where incorporated reports or other documents filed with the SEC may be accessed. We have not incorporated by reference into this prospectus supplement the information contained in, or that can be accessed through, our website, and you should not consider it to be part of this prospectus supplement.

You should rely only on the information contained in this prospectus supplement, including information incorporated by reference as described above, or any prospectus supplement or post-effective amendment that we have specifically referred you to. We have not authorized anyone else to provide you with different information. You should not assume that the information in this prospectus supplement or any prospectus supplement or post-effective amendment is accurate as of any date other than the date on the front of those documents or that any document incorporated by reference is accurate as of any date other than its filing date. You should not consider this prospectus supplement to be an offer or solicitation relating to the securities in any jurisdiction in which such an offer or solicitation relating to the securities is not authorized. Furthermore, you should not consider this prospectus supplement to be an offer or solicitation relating to the securities if the person making the offer or solicitation is not qualified to do so, or if it is unlawful for you to receive such an offer or solicitation.

An investment in our Class A common stock involves a high degree of risk. You should carefully consider the information described below and set forth under “Risk Factors” contained in our most recent Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “2022 Form 10-K”), and any updates in our subsequently filed Quarterly Reports on Form 10-Q or Current Reports on Form 8-K, together with the other information contained in or incorporated by reference into this prospectus supplement, including the risk factors described in our filings with the SEC that are incorporated by reference into this prospectus supplement, before investing in our Class A common stock. The occurrence of any of these risks could materially and adversely affect our business, financial condition, results of operations, in which case the trading price of our Class A common stock could decline and you could lose all or part of your investment. The risks and uncertainties we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our operations. The occurrence of any of these risks might cause you to lose all or part of your investment in the offered securities.

Our management will have broad discretion over the use of proceeds from this offering, and we could spend the proceeds from this offering in ways our stockholders may not agree with or that do not yield a favorable return, if at all. Because of the number and variability of factors that will determine our use of the proceeds from this offering, their ultimate use may vary substantially from their currently intended use. We expect to use the net proceeds from this offering for general corporate purposes, which may include, among other things, purchase of miners, repayment or refinancing of debt or funding acquisitions, capital expenditures or working capital. If we do not invest or apply the proceeds from this offering in ways that enhance stockholder value, we may fail to achieve expected financial results, which could cause our stock price to decline.

The trading price of our Class A common stock has been, and is likely to continue to be, volatile, and may be influenced by various factors beyond our control as well as those discussed in our “Risk Factors” set forth in our 2022 Form 10-K, including, but not limited to:

In addition, the stock markets in general, and the markets for crypto asset mining stocks in particular, have experienced extreme volatility that may have been unrelated to the operating performance of the issuer. These broad market fluctuations may adversely affect the trading price or liquidity of our Class A common stock. In the past, when the trading price of a stock has been volatile, holders of that stock have sometimes instituted securities class action litigation against the issuer. If any of our stockholders were to bring such a lawsuit against us, we could incur substantial costs defending the lawsuit and the attention of our management would be diverted from the operation of our business.

The sale of a substantial number of shares of our Class A common stock or other equity-related securities in the public markets, or the perception that such sales could occur, could depress the market price of our Class A common stock and impair our ability to raise capital through the sale of additional equity securities. We may sell large quantities of our Class A common stock at any time pursuant to this prospectus supplement or in one or more separate offerings. We cannot predict the effect that future sales of Class A common stock or other equity-related securities would have on the market price of our Class A common stock.

Subject to certain limitations in the Sales Agreement and compliance with applicable law, we have the discretion to deliver a sales notice to Wainwright at any time throughout the term of the Sales Agreement. The number of shares that are sold by Wainwright after delivering a sales notice will fluctuate based on the market price of our Class A common stock during the sales period and limits we set with Wainwright. Because the price per share of each share sold will fluctuate based on the market price of our Class A common stock during the sales period, it is not possible at this stage to predict the number of shares that will be ultimately issued.

Investors who purchase shares in this offering at different times will likely pay different prices, and so may experience different outcomes in their investment results. We will have discretion, subject to market demand, to vary the timing, prices, and numbers of shares sold, and there is no minimum or maximum sales price. Investors may experience a decline in the value of their shares as a result of share sales made at prices lower than the prices they paid.

The information in this prospectus supplement includes “forward-looking statements.” All statements, other than statements of historical fact included in this prospectus supplement, regarding our strategy, future operations, financial position, estimated revenues and losses, projected costs, prospects, plans and objectives of management are forward-looking statements. When used in this prospectus supplement, the words “may,” “might,” “will,” “should,” “seek,” “approximately,” “plan,” “possible,” “potential,” “predict,” “continue,” “could,” “believe,” “anticipate,” “intend,” “estimate,” “expect,” “project” or the negative of such terms or other similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain such identifying words. These forward-looking statements are based on our current expectations and assumptions about future events and are based on currently available information as to the outcome and timing of future events. When considering forward-looking statements, you should keep in mind the risk factors and other cautionary statements described under the heading “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business” included in this prospectus supplement or included in the 2022 Form 10-K, or any subsequent filings with the SEC under the Exchange Act and in the other documents incorporated by reference in this prospectus supplement. These forward-looking statements are based on management’s current belief, based on currently available information, as to the outcome and timing of future events.

Forward-looking statements may include statements about:

We caution you that these forward-looking statements are subject to a variety of risks and uncertainties, most of which are difficult to predict and many of which are beyond our control. These risks include, but are not

limited to, decline in demand for our products and services, the seasonality and volatility of the crypto asset industry, our acquisition strategies, the inability to comply with developments and changes in regulation, cash flow and access to capital, maintenance of third party relationships, the COVID-19 pandemic and the other risks described under “Risk Factors” in this prospectus supplement and in the documents we file with the SEC that are incorporated by reference into this prospectus supplement.

Should one or more of the risks or uncertainties described in this prospectus supplement occur, or should underlying assumptions prove incorrect, our actual results and plans could differ materially from those expressed in any forward-looking statements.

All forward-looking statements, expressed or implied, included in this prospectus supplement are expressly qualified in their entirety by this cautionary statement. This cautionary statement should also be considered in connection with any subsequent written or oral forward-looking statements that we or persons acting on our behalf may issue.

Any forward-looking statement that we make in this prospectus supplement speaks only as of the date of such statement. Except as otherwise required by applicable law, we disclaim any duty to update any forward-looking statements, all of which are expressly qualified by the statements in this section, to reflect events or circumstances after the date of this prospectus supplement.

We may issue and sell shares of our Class A common stock having aggregate sales proceeds of up to $15,000,000 from time to time. Because there is no minimum offering amount required as a condition to close this offering, the actual total public offering amount, commissions and proceeds to us, if any, are not determinable at this time. There can be no assurance that we will be able to sell any shares under or fully utilize the Sales Agreement with Wainwright.

We intend to use the net proceeds from this offering for general corporate purposes, which may include, among other things, purchase of miners, repayment or refinancing of debt or funding acquisitions, capital expenditures or working capital.

We have never declared or paid any cash dividends on our capital stock, and we do not currently intend to pay any cash dividends for the foreseeable future. We expect to retain future earnings, if any, to finance the growth and development of our business. Any future determination to pay dividends on our Class A common stock will be at the discretion of the board of directors and will depend upon, among other factors, our financial condition, operating results, current and anticipated cash needs, plans for expansion and other factors that the board of directors may deem relevant.

We have entered into the Sales Agreement with Wainwright under which we may issue and sell shares of our Class A common stock having an aggregate gross sales price of up to $15,000,000 from time to time through Wainwright acting as agent. The Sales Agreement has been filed as an exhibit to the registration statement of which this prospectus supplement and accompanying prospectus form a part.

Upon delivery of a placement notice and subject to the terms and conditions of the Sales Agreement, Wainwright may sell our Class A common stock by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act, including sales made directly on The Nasdaq Global Market or any other existing trading market of our Class A common stock. We may instruct Wainwright not to sell Class A common stock if the sales cannot be effected at or above the price designated by us from time to time. We or Wainwright may suspend the offering of Class A common stock upon notice and subject to other conditions. If we and Wainwright agree on any method of distribution other than sales of shares of our Class A common stock on or through the Nasdaq Global Market or another existing trading market in the United States at market prices, we will file a prospectus supplement providing all information about such offering as required by Rule 424(b) under the Securities Act.

We will pay Wainwright commissions, in cash, for its services in acting as agent in the sale of our Class A common stock. Wainwright will be entitled to compensation at a fixed commission rate equal to 3.0% of the gross sales price per share sold pursuant to the Sales Agreement. Because there is no minimum offering amount required as a condition to close this offering, the actual total public offering amount, commissions and proceeds to us, if any, are not determinable at this time. We have also agreed to reimburse Wainwright for certain specified expenses, including the fees and disbursements of its legal counsel in an amount up to $50,000, in addition to up to $2,500 per due diligence update session for Wainwright’s counsel’s fees and any incidental expenses to be reimbursed by us. We will report at least quarterly the number of shares of Class A common stock sold through Wainwright under the Sales Agreement, the net proceeds to us and the compensation paid by us to Wainwright in connection with the sales of Class A common stock.

Settlement for sales of Class A common stock will generally occur on the second business day following the date on which any sales are made or such shorter settlement cycle as may be in effect under Exchange Act Rule 15c6-1 from time to time, or on some other date that is agreed upon by us and Wainwright in connection with a particular transaction, in return for payment of the net proceeds to us. Sales of our Class A common stock as contemplated in this prospectus supplement will be settled through the facilities of The Depository Trust Company or by such other means as we and Wainwright may agree upon. There is no arrangement for funds to be received in an escrow, trust or similar arrangement.

Wainwright will use its commercially reasonable efforts, consistent with its sales and trading practices, to sell shares of our Class A common stock under the terms and subject to the conditions set forth in the Sales Agreement. In connection with the sale of the Class A common stock on our behalf, Wainwright will be deemed to be an “underwriter” within the meaning of the Securities Act and the compensation of Wainwright will be deemed to be underwriting commissions or discounts. We have agreed to provide indemnification and contribution to Wainwright against certain civil liabilities, including liabilities under the Securities Act.

The offering of our Class A common stock pursuant to the Sales Agreement will terminate upon the termination of the Sales Agreement or as otherwise permitted therein. We or Wainwright may suspend the offering of the Class A common stock being made through Wainwright under the Sales Agreement upon proper notice to the other party.

Our Class A common stock is listed on The Nasdaq Global Market and trades under the symbol “SDIG.” The transfer agent and registrar for our Class A common stock is American Stock Transfer & Trust Company, LLC.

Wainwright and its affiliates have provided, and may in the future provide, various investment banking, commercial banking and other financial services for us and our affiliates, for which services they may in the future receive customary fees. To the extent required by Regulation M promulgated under the Exchange Act, Wainwright will not engage in any market making activities involving our Class A common stock while the offering is ongoing under this prospectus supplement.

This prospectus supplement and the accompanying base prospectus in electronic format may be made available on a website maintained by Wainwright and Wainwright may distribute this prospectus supplement and the accompanying base prospectus electronically.

Vinson & Elkins L.L.P., New York, New York, will pass upon certain legal matters relating to the issuance and sale of the securities offered hereby on behalf of Stronghold Digital Mining, Inc. H.C. Wainwright & Co., LLC is being represented in connection with this offering by Ellenoff Grossman & Schole LLP.

The audited financial statements of Stronghold Digital Mining, Inc. incorporated by reference into this registration statement have been so included in reliance upon the report of Urish Popeck & Co., LLC, independent registered public accounting firm, upon the authority of said firm as experts in accounting and auditing.

We may offer and sell, from time to time, in one or more offerings, up to an aggregate of $25,000,000 of our Class A common stock, par value $0.0001 per share (the “Class A common stock”), shares of preferred stock, warrants, depositary shares, stock purchase contracts, units, and rights.

We may offer and sell these securities in amounts, at prices and on terms to be determined by market conditions and other factors at the time of the offering. We may offer and sell these securities to or through one or more underwriters, dealers and agents, or directly to purchasers, on a continuous or delayed basis. See “Plan of Distribution.” This prospectus describes the general terms of these securities and the general manner in which we will offer the securities. The specific terms of any securities we offer will be included in a supplement to this prospectus. The prospectus supplement will also describe the specific manner in which we will offer the securities.

You should carefully read this prospectus and any prospectus supplement before you invest. You should also read the documents we refer to in the “Where You Can Find More Information” section of this prospectus for information on us and our financial statements.

Our Class A common stock is listed on The Nasdaq Global Market under the symbol “SDIG.” On May 19, 2023, the closing price of our Class A common stock was $6.45 per share. As of May 19, 2023, the aggregate market value of our common stock held by our non-affiliates, as calculated pursuant to the rules of the Securities and Exchange Commission (the “SEC”), was approximately $53.6 million, based upon 4,742,615 shares of our outstanding common stock held by non-affiliates at the per share price of $11.30, the closing sale price of our Class A common stock on The Nasdaq Global Market on April 18, 2023 (as adjusted for the Reverse Stock Split). Pursuant to General Instruction I.B.6 of Form S-3, in no event will we sell securities in a public offering with a value exceeding more than one-third of our “public float” (i.e., the market value of our common stock held by our non-affiliates) in any 12-month period so long as our public float remains below $75.0 million. We have not sold any securities in reliance on General Instruction I.B.6 of Form S-3 during the 12 calendar months prior to and including the date of this prospectus.

We are an “emerging growth company” and a “smaller reporting company” under applicable federal securities laws and will be subject to reduced reporting requirements. This prospectus complies with the requirements that apply to an issuer that is an emerging growth company. We have two classes of common stock: Class A common stock and Class V common stock. Each share of Class V common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by stockholders generally. Holders of Class A common stock and Class V common stock vote together as a single class on all matters presented to our stockholders for their vote or approval, except as otherwise required by applicable law or by our second amended and restated certificate of incorporation (as amended, the “second amended and restated certificate of incorporation”). Q Power LLC, which is controlled by Greg Beard, our Chairman and Chief Executive Officer, and Bill Spence, together with Messrs. Beard and Spence, held approximately 39.4% of the total voting stock outstanding as of May 5, 2023, including 100% of the Class V common stock outstanding, which votes together with the Class A common stock as a single class.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

Investing in our Class A common stock involves risks. See “Risk Factors” beginning on page 6 and in the documents we file with the SEC that are incorporated by reference into this prospectus to read about factors you should consider before buying shares of our Class A common stock.

This prospectus is part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the “SEC”) utilizing a “shelf” registration process. Under this shelf registration process, we may offer and sell, from time to time, in one or more offerings, up to $25.0 million of our Class A common stock.

We may file one or more prospectus supplements, or, if appropriate, post-effective amendments, to accompany this prospectus to add, update or change information contained in this prospectus. Each time we offer securities, we will provide you with this prospectus and a prospectus supplement, or post-effective amendment, if applicable, that will describe, among other things, the specific amounts and prices and terms of the shares of the securities being offered. If the information varies between this prospectus and the accompanying prospectus supplement, or post-effective amendment, if any, you should rely on the information in the accompanying prospectus supplement or post-effective amendment. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to the offering. You should read both this prospectus and the accompanying prospectus supplement or post-effective amendment, if any, and any free writing prospectus together with the additional information described under “Where You Can Find More Information.” You should also carefully consider, among other things, the matters discussed in the section entitled “Risk Factors” herein, and the accompanying prospectus supplement or post-effective amendment, if any, and any related free writing prospectus, and under similar headings in any other documents that are incorporated by reference into this prospectus, and the accompanying prospectus supplement or post-effective amendment, if any, and any related free writing prospectus.

This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under the heading “Where You Can Find More Information.”

You should rely only on the information contained or incorporated by reference in this prospectus or in any prospectus supplement or post-effective amendment or free-writing prospectus we may authorize to be delivered or made available to you. We have not authorized anyone to provide you with information different from that contained or incorporated by reference in this prospectus and any free writing prospectus we have prepared. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. Offers to sell, and solicitations of offers to buy, shares of our Class A common stock are being made only in jurisdictions where offers and sales are permitted. The information in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or of any sale of our Class A common stock. Our business, financial condition, results of operations and prospects may have changed since the date of this prospectus.

This prospectus contains forward-looking statements that are subject to a number of risks and uncertainties, many of which are beyond our control. See “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” appearing in this prospectus and in the documents we file with the SEC that are incorporated by reference into this prospectus.

The market data and certain other statistical information used or incorporated by reference into this prospectus are based on independent industry publications, publicly available information, business organizations, government publications and other published independent sources. Some data is also based on our good faith estimates. Although we believe these third-party sources are reliable as of their respective dates, we have not independently verified the accuracy or completeness of this information. Market share data is subject to change and may be limited by the availability of raw data, the voluntary nature of the data gathering process and other limitations in any statistical survey of market share data. Accordingly, you are cautioned not to place undue reliance on such market share data or any other such estimates. The industry in which we operate is subject to a

high degree of uncertainty and risk due to a variety of factors, including those described in the section entitled “Risk Factors” appearing in this prospectus and in the documents we file with the SEC that are incorporated by reference into this prospectus. These and other factors could cause results to differ materially from those expressed in these publications.

We rely on various trade names that we use in connection with the operation of our business. This prospectus may also contain trademarks, service marks and trade names of third parties, which are the property of their respective owners. Our use or display of third parties’ trademarks, service marks, trade names or products in this prospectus is not intended to, and does not imply a relationship with, or endorsement or sponsorship by us. Solely for convenience, the trademarks, service marks and trade names referred to in this prospectus may appear without the ®, TM or SM symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or the right of the applicable licensor to these trademarks, service marks and trade names.

Certain monetary amounts, percentages and other figures included in this prospectus have been subject to rounding adjustments. Percentage amounts included in this prospectus have not in all cases been calculated on the basis of such rounded figures, but on the basis of such amounts prior to rounding. For this reason, percentage amounts in this prospectus may vary from those obtained by performing the same calculations using the figures in our combined financial statements included elsewhere in this prospectus. Certain other amounts that appear in this prospectus may not sum due to rounding.

On May 15, 2023, we effected a 1-for-10 reverse stock split of the shares of our Class A common stock and our Class V common stock, par value $0.0001 per share (the “Class V common stock”) (the “Reverse Stock Split”). Every 10 shares of issued and outstanding Class A common stock and Class V common stock were automatically combined into one issued and outstanding share of Class A common stock or Class V common stock, as applicable. Any fractional shares that would otherwise have resulted from the Reverse Stock Split were rounded up to the next whole number. Unless otherwise indicated, the number of shares of Class A common stock and Class V common stock presented in this prospectus is adjusted to reflect the Reverse Stock Split.

We are subject to the informational requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and in accordance therewith file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information regarding registrants that file electronically with the SEC. The website address of the SEC is www.sec.gov.

We make available free of charge on or through our website at www.ir.strongholddigitalmining.com, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with or otherwise furnish it to the SEC.

We have filed with the SEC a registration statement under the Securities Act of 1933, as amended (the “Securities Act”), relating to the offering of these securities. The registration statement, including the attached exhibits, contains additional relevant information about us and the securities. This prospectus does not contain all of the information set forth in the registration statement. You can obtain a copy of the registration statement for free at www.sec.gov. The registration statement and the documents referred to below under “Incorporation of Certain Information By Reference” are also available on our website, www.ir.strongholddigitalmining.com.

We have not incorporated by reference into this prospectus the information on our website, and you should not consider it to be a part of this prospectus.

The SEC allows us to “incorporate by reference” into this prospectus the information we file with the SEC. This means that we can disclose important information to you by referring you to those documents without restating that information in this document. The information incorporated by reference into this prospectus is considered to be part of this prospectus, and information in documents that we file later with the SEC will automatically update and supersede information contained in documents filed earlier with the SEC or contained in this prospectus. We incorporate by reference in this prospectus the documents listed below and all documents that we may subsequently file with the SEC under Sections 13(a), 13(c), 14, or 15(d) of the Exchange Act, after the date on which the registration statement was initially filed with the SEC (including all such documents that we may file with the SEC after the date the registration statement was initially filed and prior to the effectiveness of the registration statement) until all offerings under the registration statement of which this prospectus forms a part are completed or terminated, provided, however, that we are not incorporating, in each case, any documents or information deemed to have been furnished and not filed in accordance with SEC rules:

We will provide to each person, including any beneficial owner, to whom a copy of this prospectus is delivered, a copy of any or all of the information that we have incorporated by reference into this prospectus. We will provide this information upon written or oral request at no cost to the requester. Requests for these documents should be directed to Stronghold Digital Mining, Inc., 595 Madison Avenue, 28th Floor, New York, New York 10022, telephone (845) 579-5992. We also maintain a website at www.strongholddigitalmining.com where incorporated reports or other documents filed with the SEC may be accessed. We have not incorporated by reference into this prospectus the information contained in, or that can be accessed through, our website, and you should not consider it to be part of this prospectus.

You should rely only on the information contained in this prospectus, including information incorporated by reference as described above, or any prospectus supplement or post-effective amendment that we have specifically referred you to. We have not authorized anyone else to provide you with different information. You should not assume that the information in this prospectus or any prospectus supplement or post-effective amendment is accurate as of any date other than the date on the front of those documents or that any document incorporated by reference is accurate as of any date other than its filing date. You should not consider this prospectus to be an offer or solicitation relating to the securities in any jurisdiction in which such an offer or solicitation relating to the securities is not authorized. Furthermore, you should not consider this prospectus to be an offer or solicitation relating to the securities if the person making the offer or solicitation is not qualified to do so, or if it is unlawful for you to receive such an offer or solicitation.

Except as otherwise indicated or required by the context, all references in this prospectus to the “Company,” “we,” “us” or “our” relate to Stronghold Digital Mining, Inc. (“Stronghold Inc.”) and its consolidated subsidiaries following the reorganization of the Company effected on April 1, 2021. References in this prospectus to “Q Power” refer to Q Power LLC, which prior to the reorganization (i) was the sole regarded owner of Stronghold Digital Mining LLC (f/k/a Stronghold Power LLC) (“SDM”) and (ii) indirectly held 70% of the limited partner interests and 100% of the general partner interests in Scrubgrass Reclamation Company, L.P. (f/k/a Scrubgrass Generating Company, L.P.) (“Scrubgrass LP”).

We are a low-cost, environmentally beneficial, vertically integrated crypto asset mining company currently focused on mining Bitcoin and environmental remediation and reclamation services. We wholly own and operate two coal refuse power generation facilities that we have upgraded: (i) our first reclamation facility located on a 650-acre site in Scrubgrass Township, Venango County, Pennsylvania, which we acquired the remaining interest of in April 2021 and has the capacity to generate approximately 83.5 megawatts (“MW”) of electricity and (ii) a facility located near Nesquehoning, Pennsylvania, which we acquired in November 2021 and which has the capacity to generate approximately 80 MW of electricity, each of which is as an Alternative Energy System because coal refuse is classified under Pennsylvania law as a Tier II Alternative Energy Source (large-scale hydropower is also classified in this tier). We are committed to generating our energy and managing our assets sustainably, and we believe that we are one of the first vertically integrated crypto asset mining companies with a focus on environmentally beneficial operations.

As a company with less than $1.235 billion in revenue during our last fiscal year, we qualify as an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). An emerging growth company may take advantage of specified reduced reporting and other requirements that are otherwise applicable generally to public companies. These provisions include:

We may take advantage of these provisions until the last day of our fiscal year following the fifth anniversary of the completion of our initial public offering (the “IPO”) or such earlier time that we are no longer an emerging growth company. We would cease to be an emerging growth company upon the earliest of: (i) the last day of the first fiscal year in which our annual gross revenues are $1.235 billion or more; (ii) the date on which we have, during the previous three-year period, issued more than $1.0 billion in non-convertible debt securities; (iii) on the last day of the fiscal year following the date of the fifth anniversary of our first sale of common equity securities under an effective registration statement or (iv) the date on which we are deemed to be a “large accelerated filer,” which will occur as of the end of any fiscal year in which we (x) have an aggregate market value of our common stock held by non-affiliates of $700 million or more as of the last business day of our most recently completed second fiscal quarter, (y) have been required to file annual and quarterly reports under the Exchange Act, for a period of at least 12 months and (z) have filed at least one annual report pursuant to the Exchange Act.

We have elected to take advantage of the reduced disclosure obligations listed above in this prospectus, and may elect to take advantage of other reduced reporting requirements in future filings. In particular, we have elected to adopt

the reduced disclosure with respect to our executive compensation disclosure. As a result of this election, the information that we provide stockholders may be different than you might get from other public companies.

The JOBS Act permits an emerging growth company like us to take advantage of an extended transition period to comply with new or revised accounting standards applicable to public companies. We have elected to use this extended transition period and, as a result, we will adopt new or revised accounting standards on the relevant dates on which adoption of such standards is required for private companies. Our election to use the transition periods permitted by this election may make it difficult to compare our financial statements to those of non-emerging growth companies and other emerging growth companies that have opted out of the extended transition periods permitted under the JOBS Act and that will comply with new or revised financial accounting standards. If we were to subsequently elect instead to comply with public company effective dates, such election would be irrevocable pursuant to the JOBS Act.

Additionally, we are a “smaller reporting company” as defined in Item 10(f)(1) of Regulation S-K. Smaller reporting companies may take advantage of certain reduced disclosure obligations, including, among other things, providing only two years of audited financial statements. We will remain a smaller reporting company until the last day of the fiscal year in which (1) the market value of our common stock held by non-affiliates exceeds $250 million as of the end of that fiscal year’s second fiscal quarter and (2) our annual revenues exceeded $100 million during such completed fiscal year and the market value of our common stock held by non-affiliates exceeds $700 million as of the end of that fiscal year’s second fiscal quarter.

Our principal executive offices are located at 595 Madison Avenue, 28th Floor, New York, New York 10022, and our telephone number at that address is (845) 579-5992. Our website address is www.strongholddigitalmining.com. Information contained on our website does not constitute part of this prospectus.

An investment in our Class A common stock involves a high degree of risk. You should carefully consider the information set forth under “Risk Factors” contained in our most recent Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “2022 Form 10-K”), and any updates in our subsequently filed Quarterly Reports on Form 10-Q or Current Reports on Form 8-K, together with the other information contained in or incorporated by reference into this prospectus, including the risk factors described in our filings with the SEC, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our audited consolidated financial statements and related notes that are incorporated by reference into this prospectus before investing in our Class A common stock. The occurrence of any of these risks could materially and adversely affect our business, financial condition, results of operations, in which case the trading price of our Class A common stock could decline and you could lose all or part of your investment.

The information in this prospectus includes “forward-looking statements.” All statements, other than statements of historical fact included in this prospectus, regarding our strategy, future operations, financial position, estimated revenues and losses, projected costs, prospects, plans and objectives of management are forward-looking statements. When used in this prospectus, the words “may,” “might,” “will,” “should,” “seek,” “approximately,” “plan,” “possible,” “potential,” “predict,” “continue,” “could,” “believe,” “anticipate,” “intend,” “estimate,” “expect,” “project” or the negative of such terms or other similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain such identifying words. These forward-looking statements are based on our current expectations and assumptions about future events and are based on currently available information as to the outcome and timing of future events. When considering forward-looking statements, you should keep in mind the risk factors and other cautionary statements described under the heading “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business” included in this prospectus or included in the 2022 Form 10-K, or any subsequent filings with the SEC under the Exchange Act and in the other documents incorporated by reference in this prospectus. These forward-looking statements are based on management’s current belief, based on currently available information, as to the outcome and timing of future events.

Forward-looking statements may include statements about:

We caution you that these forward-looking statements are subject to a variety of risks and uncertainties, most of which are difficult to predict and many of which are beyond our control. These risks include, but are not limited to, decline in demand for our products and services, the seasonality and volatility of the crypto asset

industry, our acquisition strategies, the inability to comply with developments and changes in regulation, cash flow and access to capital, maintenance of third party relationships, the COVID-19 pandemic and the other risks described under “Risk Factors” in this prospectus and in the documents we file with the SEC that are incorporated by reference into this prospectus.

Should one or more of the risks or uncertainties described in this prospectus occur, or should underlying assumptions prove incorrect, our actual results and plans could differ materially from those expressed in any forward-looking statements.

All forward-looking statements, expressed or implied, included in this prospectus are expressly qualified in their entirety by this cautionary statement. This cautionary statement should also be considered in connection with any subsequent written or oral forward-looking statements that we or persons acting on our behalf may issue.

Any forward-looking statement that we make in this prospectus speaks only as of the date of such statement. Except as otherwise required by applicable law, we disclaim any duty to update any forward-looking statements, all of which are expressly qualified by the statements in this section, to reflect events or circumstances after the date of this prospectus.

Unless otherwise indicated to the contrary in an accompanying prospectus supplement or post-effective amendment, we will use the net proceeds from the sale of the securities covered by this prospectus for general corporate purposes, which may include, among other things, purchase of miners, repayment or refinancing of debt or funding acquisitions, capital expenditures or working capital.

Any specific allocation of the net proceeds of an offering of securities to a specific purpose will be determined at the time of such offering and will be described in the related prospectus supplement.

The authorized capital stock of Stronghold Inc. consists of 238,000,000 shares of Class A common stock, $0.0001 par value per share, 50,000,000 shares of Class V common stock, $0.0001 par value per share, and 50,000,000 shares of preferred stock, $0.0001 par value per share, of which a series of 23,102 shares of Series C Preferred Stock has been designated. As of May 1, 2023, there were 5,300,275 shares of Class A common stock, 2,605,760 shares of Class V common stock, and 21,542 shares of Series C Preferred Stock issued and outstanding. As of May 1, 2023 there were 41 stockholders of record of our Class A common stock, one stockholder of record of our Class V common stock and three stockholders of record of our Series C Preferred Stock.

The following summary of the capital stock, our second amended and restated certificate of incorporation and amended and restated bylaws of Stronghold Inc. does not purport to be complete and is qualified in its entirety by reference to the provisions of applicable law and to our second amended and restated certificate of incorporation and amended and restated bylaws, which are filed as exhibits to the registration statement of which this prospectus is a part.

Voting Rights. Holders of shares of Class A common stock are entitled to one vote per share held of record on all matters to be voted upon by the stockholders. The holders of Class A common stock do not have cumulative voting rights in the election of directors.

Dividend Rights. Holders of shares of our Class A common stock are entitled to ratably receive dividends when and if declared by our Board out of funds legally available for that purpose, subject to any statutory or contractual restrictions on the payment of dividends and to any prior rights and preferences that may be applicable to any outstanding preferred stock.

Liquidation Rights. Upon our liquidation, dissolution, distribution of assets or other winding up, the holders of Class A common stock are entitled to receive ratably the assets available for distribution to the stockholders after payment of liabilities and the liquidation preference of any of our outstanding shares of preferred stock.

Other Matters. The shares of Class A common stock have no preemptive or conversion rights and are not subject to further calls or assessment by us. There are no redemption or sinking fund provisions applicable to the Class A common stock. All issued and outstanding shares of our Class A common stock are fully paid and non-assessable.

Voting Rights. Holders of shares of our Class V common stock are entitled to one vote per share held of record on all matters to be voted upon by the stockholders. Holders of shares of our Class A common stock and Class V common stock vote together as a single class on all matters presented to our stockholders for their vote or approval.

Dividend and Liquidation Rights. Holders of our Class V common stock do not have any right to receive dividends, unless (i) the dividend consists of shares of our Class V common stock or of rights, options, warrants or other securities convertible or exercisable into or exchangeable or redeemable for shares of Class V common stock paid proportionally with respect to each outstanding share of Class V common stock and (ii) a dividend consisting of shares of Class A common stock or of rights, options, warrants or other securities convertible or exercisable into or exchangeable or redeemable for shares for Class A common stock on equivalent terms is simultaneously paid to the holders of Class A common stock. Holders of our Class V common stock do not have any right to receive a distribution upon a liquidation or winding up of Stronghold Inc.

Other Matters. The shares of Class V common stock have no preemptive or conversion rights and are not subject to further calls or assessment by us. There are no redemption or sinking fund provisions applicable to the Class V common stock. All outstanding shares of our Class V common stock are fully paid and non-assessable.

Our second amended and restated certificate of incorporation authorizes our Board, subject to any limitations prescribed by law, without further shareholder approval, to establish and to issue from time to time

one or more classes or series of preferred stock, par value $0.0001 per share, covering up to an aggregate of 50,000,000 shares of preferred stock. Each class or series of preferred stock will cover the number of shares and will have the powers, preferences, rights, qualifications, limitations and restrictions determined by the Board.

The certificate of designation fixes for each class or series the designations, powers, preferences, rights, the number of shares constituting that series and the distinctive designation of that series, which number may be increased or decreased (but not below the number of shares then outstanding) from time to time by action of the board of directors;

Once designated by our board of directors, each series of preferred stock may have specific financial and other terms that will be described in a prospectus supplement. The description of the preferred stock that is set forth in any prospectus supplement is not complete without reference to the documents that govern the preferred stock. These include our second amended and restated certificate of incorporation, the Certificate of Designations (as defined herein) and any certificates of designation that our board of directors may adopt.

All shares of preferred stock offered hereby will, when issued, be fully paid and non-assessable, including shares of preferred stock issued upon the exercise of preferred stock warrants or subscription rights, if any.

The rights, preferences, and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms, and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of our common stock. Except as provided by law or in a preferred stock designation, the holders of preferred stock will not be entitled to vote at or receive notice of any meeting of stockholders. In some cases, the issuance of preferred stock could delay or discourage a change of control in us. The issuance of preferred stock, while providing desired flexibility in connection with possible acquisitions and other corporate purposes, could adversely affect the voting power of holders of our common stock. It could also affect the likelihood that holders of our common stock will receive dividend payments and payments upon liquidation.

Pursuant to our Certificate of Designations (the “Certificate of Designations”), filed with the Secretary of State of the State of Delaware with respect to the Series C Preferred Stock, we designated 23,102 shares of our authorized and unissued preferred stock as Series C Preferred Stock, and established the rights, preferences and privileges of the Series C Preferred Stock, which are summarized below. As of March 31, 2023, we had 21,542 shares of Series C Preferred Stock outstanding.

Designation and Amount. The Certificate of Designations designates twenty-three thousand, one hundred two (23,102) shares of Series C Preferred Stock, with each share having a stated value of $1,000, subject to any adjustment for stock splits, stock combinations, recapitalizations and similar transactions as set forth in the Certificate of Designations (the “Stated Value”).

Ranking and Liquidation Preference. The Series C Preferred Stock ranks, with respect to rights upon an acquisition, merger or consolidation of the Company, sale of all or substantially all assets of the Company, other business combination or liquidation, dissolution or winding up of the affairs of the Company, either voluntary or involuntary (collectively, a “Liquidation Event”), (i) senior to the Class A common stock and Class V common stock and any other class or series of capital stock of the Company the terms of which do not expressly provide that such class or series ranks senior to or on parity with the Series C Preferred Stock with respect to a Liquidation Event (“Junior Stock”), (ii) on a parity with any other class or series of capital stock of the Company the terms of which provide that such class or series ranks on a parity with the Series C Preferred Stock with respect to a Liquidation Event (“Parity Stock”), and (iii) junior to any other class or series of capital stock of the Company the terms of which expressly provide that such class or series ranks senior to the Series C Preferred Stock with respect to a Liquidation Event (“Senior Stock”). In the event of a Liquidation Event, each holder of shares of Series C Preferred Stock then outstanding shall be entitled to receive, before any payment or distribution of any assets of the Company shall be made or set apart for holders of the Junior Stock, an amount per share of Series C Preferred Stock equal to the Stated Value.

Voting Rights. Except as required by the DGCL or our second amended and restated certificate of incorporation, holders of shares of Series C Preferred Stock do not have any voting rights, except that the approval of holders of at least two-thirds (66.67%) of the then-outstanding shares of Series C Preferred Stock is required to (i) amend, alter, repeal or otherwise modify (whether by merger, operation of law, consolidation or otherwise) (a) any provision of our second amended and restated certificate of incorporation or our amended and restated bylaws in a manner that would adversely affect the powers, rights, preferences or privileges of the Series C Preferred Stock, or (b) any provision of the Certificate of Designations, (ii) authorize, create, increase the amount of, or issue any Series C Preferred Stock or any class or series of Senior Stock or Parity Stock or any security convertible into, or exchangeable or exercisable for, shares of Series C Preferred Stock, Senior Stock, or Parity Stock, (iii) authorize, enter into or otherwise engage in a Fundamental Transaction (as defined in the Certificate of Designations) unless such Fundamental Transaction does not adversely affect the rights, preferences or privileges of the Series C Preferred Stock, and (iv) agree or consent to any of the foregoing.

Optional Conversion. Each holder is entitled, upon written notice to the Company, to convert all or a portion of such holder’s outstanding shares of Series C Preferred Stock into a number of shares of Class A common stock (an “Optional Conversion”) at a conversion rate equal to (i) the Stated Value plus cash in lieu of any fractional shares, divided by (ii) a conversion price of $4.00 per share of Class A common stock, subject to certain adjustments provided in the Certificate of Designations (the “Conversion Price”). A holder does not have the right to effect an Optional Conversion to the extent that, after giving effect to such conversion, such holder (together with such holder’s affiliates and any person acting as a group with such holder or any of its affiliates) would beneficially own in excess of 9.99% of the number of shares of Class A common stock outstanding immediately after giving effect to such conversion (the “Series C Beneficial Ownership Limitation”).

In the event of any Fundamental Transaction, as described in the Certificate of Designations and generally including any merger with or into another entity, sale of all or substantially all of the Company’s assets, tender offer or exchange offer, reclassification of shares of the Class A common stock, or stock purchase agreement or other business combination wherein another person or group acquires more than 50% of the then-outstanding shares of Class A common stock, then upon any subsequent Optional Conversion or the Automatic Conversion (as defined below), the holder has the right to receive as alternative consideration, for each share of Class A common stock that would have been issuable upon such Optional Conversion or the Automatic Conversion immediately prior to the occurrence of such Fundamental Transaction, the number of shares of Class A common stock of the successor or acquiring corporation or of the Company, if it is the surviving corporation, and any additional consideration receivable upon or as a result of such transaction by a holder of the number of shares of Class A common stock into which the shares of Series C Preferred Stock are convertible immediately prior to such event.

Automatic Conversion. Upon the fifth anniversary of the date of issuance of the Series C Preferred Stock, each share of Series C Preferred Stock then outstanding will automatically and immediately convert into shares of Class A common stock or, to the extent such conversion would cause a holder to exceed the Series C Beneficial Ownership Limitation, into Pre-Funded Warrants (the “Automatic Conversion”).

Other Rights. The Series C Preferred Stock is not entitled to receive dividends, does not have preemptive or subscription rights, and has no redemption or sinking fund provisions or rights.

This summary of certain provisions of the Certificate of Designations is not intended to be complete, and is subject to, and qualified in its entirety by reference to, all of the provisions of the Certificate of Designations.

We have entered into various registration rights agreements, certain of which have continued registration obligations. The following summary of certain provisions of the following registration rights agreements is not intended to be complete, and is subject to, and qualified in its entirety by reference to, all of the provisions of such registration rights agreements.

Pursuant to a Registration Rights Agreement, dated April 21, 2023, that we entered into with Armistice (the “Armistice Registration Rights Agreement”), we have agreed to file a registration statement with respect to the registration of the resale by Armistice of all Registrable Securities (as defined in the Armistice Registration Rights Agreement), and to use our commercially reasonable efforts to cause such registration statement to become effective within the timeframes specified in the Armistice Registration Rights Agreement (but in no event after 60th calendar day following the date of the Armistice Registration Rights Agreement or, in the event of a review by the SEC, the 90th calendar day); failure to do so will result in certain liquidated damages as set forth in the Armistice Registration Rights Agreement. In addition, we agreed that, upon the registration statement being declared effective under the Securities Act, we use commercially reasonable efforts to keep such registration statement continuously effective under the Securities Act until the date that all Registrable Securities covered hereby (i) have been sold thereunder or pursuant to Rule 144 of the Securities Act, or (ii) may be sold without volume or manner-of-sale restrictions pursuant to Rule 144 and without the requirement for the Company to be in compliance with the current public information requirement under Rule 144.

We have agreed to indemnify Armistice for certain violations of federal or state securities laws in connection with any registration statement in which such selling stockholder sells its Registrable Securities pursuant to these registration rights. The selling stockholders will, in turn, agree to indemnify us for federal or state securities law violations that occur in reliance upon written information it provides to us for use in the registration statement.

Pursuant to the terms of the Settlement Agreement and Mutual Release, dated April 26, 2023, by and between the Company and Neiswonger, we have agreed to use our commercially reasonable efforts to file a registration statement on Form S-3 registering the 72,500 shares of Class A common stock held by Neiswonger within 30 days of the date of the Neiswonger Agreement.

Pursuant to the terms of (i) an exchange agreement, dated December 30, 2022, between us and certain parties thereto, we entered into a registration rights agreement with such parties (the “Exchange Registration Rights Agreement”), (ii) a credit agreement, dated October 27, 2022, as subsequently amended, we entered into a registration rights agreement with Whitehawk Finance LLC (the “Whitehawk Registration Rights Agreement”) and (iii) a settlement agreement and mutual release, dated March 28, 2023, we entered into a registration rights agreement with Bruce – Merrilees Electric Co. (the “B&M Registration Rights Agreement” and, together with the Exchange Registration Rights Agreement and the Whitehawk Registration Rights Agreement, the “2023 Registration Rights Agreements”).

Pursuant to the 2023 Registration Rights Agreements, we were required to file a registration statement covering the resale of the Registrable Securities (as defined in the respective 2023 Registration Rights Agreement) with the SEC on a continuous basis and, upon such registration statement being declared effective under the Securities Act, to use commercially reasonable efforts to keep such registration statement continuously effective under the Securities Act until the date that all securities covered thereunder (i) have been sold thereunder or pursuant to Rule 144 of the

Securities Act, or (ii) may be sold without volume or manner-of-sale restrictions pursuant to Rule 144 and without the requirement for the Company to be in compliance with the current public information requirement under Rule 144. We filed such registration statement with the SEC on April 5, 2023 (SEC File No. 333-271151), and it was declared effective by the SEC on April 14, 2023.

On September 13, 2022, pursuant to the terms of a securities purchase agreement, dated September 13, 2022, between us and Armistice, as subsequently amended (the “2022 Armistice SPA”) we entered into a registration rights agreement (the “2022 Armistice Registration Rights Agreement”). Pursuant to the 2022 Armistice Registration Rights Agreement, we were required to file a registration statement covering the resale of the securities issued and sold pursuant to the 2022 Armistice SPA with the SEC on a continuous basis pursuant to Rule 415 promulgated under the Securities Act and, upon such registration statement being declared effective under the Securities Act, to use commercially reasonable efforts to keep such registration statement continuously effective under the Securities Act until the date that all securities covered thereunder (i) have been sold thereunder or pursuant to Rule 144 of the Securities Act, or (ii) may be sold without volume or manner-of-sale restrictions pursuant to Rule 144 and without the requirement for the Company to be in compliance with the current public information requirement under Rule 144. We filed such registration statement with the SEC on October 13, 2022 (SEC File No. 333-267869), and it was declared effective by the SEC on February 10, 2023.

Some provisions of Delaware law, and our second amended and restated certificate of incorporation and our amended and restated bylaws contain provisions that could make the following transactions more difficult: acquisitions of us by means of a tender offer, a proxy contest or otherwise; or removal of our incumbent officers and directors. These provisions may also have the effect of preventing changes in our management. It is possible that these provisions could make it more difficult to accomplish or could deter transactions that stockholders may otherwise consider to be in their best interest or in our best interests, including transactions that might result in a premium over the market price for our shares.

These provisions, summarized below, are expected to discourage coercive takeover practices and inadequate takeover bids. These provisions are also designed to encourage persons seeking to acquire control of us to first negotiate with us. We believe that the benefits of increased protection and our potential ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire or restructure us outweigh the disadvantages of discouraging these proposals because, among other things, negotiation of these proposals could result in an improvement of their terms.

We are subject to the provisions of Section 203 of the DGCL, regulating corporate takeovers. In general, those provisions prohibit a Delaware corporation, including those whose securities are listed for trading on Nasdaq, from engaging in any business combination with any interested shareholder for a period of three years following the date that the shareholder became an interested shareholder, unless:

Provisions of our second amended and restated certificate of incorporation and our amended and restated bylaws may delay or discourage transactions involving an actual or potential change in control or change in our management, including transactions in which stockholders might otherwise receive a premium for their shares, or transactions that our stockholders might otherwise deem to be in their best interests. Therefore, these provisions could adversely affect the price of our Class A common stock.

Among other things, our second amended and restated certificate of incorporation and our amended and restated bylaws:

Under Delaware law, the right to vote cumulatively does not exist unless the certificate of incorporation specifically authorizes cumulative voting. Our second amended and restated certificate of incorporation does not authorize cumulative voting. Therefore, stockholders holding a majority in voting power of the shares of our stock entitled to vote generally in the election of directors will be able to elect all our directors.

Our second amended and restated certificate of incorporation provides that unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware will, to the fullest extent permitted by applicable law, be the sole and exclusive forum for:

Notwithstanding the foregoing, the exclusive forum provision will not apply to suits brought to enforce any liability or duty created by the Exchange Act, the Securities Act or any other claim for which the federal courts have exclusive jurisdiction. Our second amended and restated certificate of incorporation also provides that any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock will be deemed to have notice of, and to have consented to, this forum selection provision. Although we believe these provisions will benefit us by providing increased consistency in the application of Delaware law for the specified types of actions and proceedings, the provisions may have the effect of discouraging lawsuits against our directors, officers, employees and agents. The enforceability of similar exclusive forum provisions in other companies’ certificates of incorporation has been challenged in legal proceedings, and it is possible that, in connection with one or more actions or proceedings described above, a court could rule that this provision in our second amended and restated certificate of incorporation is inapplicable or unenforceable.

Our second amended and restated certificate of incorporation, to the fullest extent permitted by law, renounces any reasonable expectancy interest that we have in, or right to be offered an opportunity to participate in, any corporate or business opportunities that are from time to time presented to Q Power, its affiliated directors and affiliates, and our non-employee directors, and that, to the fullest extent permitted by law, such persons will have no duty to refrain from engaging in any transaction or matter that may be a corporate or business opportunity in which we or any of our subsidiaries could have an interest or expectancy. In addition, to the fullest extent permitted by law, in the event that Q Power, its affiliated directors and affiliates, and our directors acquire knowledge of any such opportunity, other than in their capacity as a member of our Board, such person will have no duty to communicate or present such opportunity to us or any of our subsidiaries, and they may take any such opportunity for themselves or offer it to another person or entity.

Our second amended and restated certificate of incorporation limits the liability of our directors for monetary damages for breach of their fiduciary duty as directors, except for liability that cannot be eliminated under the DGCL. Delaware law provides that directors of a company will not be personally liable for monetary damages for breach of their fiduciary duty as directors, except for liabilities:

This provision also does not affect a director’s responsibilities under any other laws, such as the federal securities laws or state or federal environmental laws. Any amendment, repeal or modification of these provisions

will be prospective only and would not affect any limitation on liability of a director for acts or omissions that occurred prior to any such amendment, repeal or modification.

Our amended and restated bylaws also provide that we will indemnify our directors and officers to the fullest extent permitted by Delaware law. Our bylaws also permits us to purchase insurance on behalf of any officer, director, employee or other agent for any liability arising out of that person’s actions as our officer, director, employee or agent, regardless of whether Delaware law would permit indemnification. We intend to enter into indemnification agreements with each of our current and future directors and officers. These agreements will require us to indemnify these individuals to the fullest extent permitted under Delaware law against liability that may arise by reason of their service to us, and to advance expenses incurred as a result of any proceeding against them as to which they could be indemnified. We believe that the limitation of liability provision in our second amended and restated certificate of incorporation and the indemnification agreements facilitates our ability to continue to attract and retain qualified individuals to serve as directors and officers.

Under the DGCL, with certain exceptions, our stockholders have appraisal rights in connection with a merger or consolidation. Pursuant to the DGCL, stockholders who properly request and perfect appraisal rights in connection with such merger or consolidation will have the right to receive payment of the fair value of their shares as determined by the Delaware Court of Chancery.

Under the DGCL, any of our stockholders may bring an action in our name to procure a judgment in our favor, also known as a derivative action; provided that the stockholder bringing the action is a holder of our shares at the time of the transaction to which the action relates or such stockholder’s stock thereafter devolved by operation of law.

The transfer agent and registrar for our Class A common stock is American Stock Transfer & Trust Company, LLC.

Our Class A common stock is listed on The Nasdaq Global Market and trades under the symbol “SDIG.”

We may issue warrants for the purchase of shares of our Class A common stock or shares of our preferred stock. The following description sets forth certain general terms and provisions of the warrants that we may offer pursuant to this prospectus. The particular terms of the warrants and the extent, if any, to which the general terms and provisions may apply to the warrants so offered will be described in the applicable prospectus supplement.

Warrants may be issued independently or together with other securities and may be attached to or separate from any offered securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a bank or trust company, as warrant agent. The warrant agent will act solely as our agent in connection with the warrants and will not have any obligation or relationship of agency or trust for or with any holders or beneficial owners of warrants.

A copy of the forms of the warrant agreement and the warrant certificate, if any, relating to any particular issue of warrants will be filed with the SEC each time we issue warrants, and you should read those documents for provisions that may be important to you. For more information on how you can obtain copies of the forms of the warrant agreement and the related warrant certificate, if any, see “Where You Can Find More Information.”

The prospectus supplement relating to a particular issue of warrants to issue shares of our Class A common stock or shares of our preferred stock will describe the terms of the Class A common share warrants and preferred share warrants, including the following:

Each warrant will entitle the holder of the warrant to purchase at the exercise price set forth in the applicable prospectus supplement the number of shares of Class A common stock or shares of preferred stock being offered. Holders may exercise warrants at any time up to the close of business on the expiration date set

forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants are void. Holders may exercise warrants as set forth in the prospectus supplement relating to the warrants being offered.

Until a holder exercises the warrants to purchase our shares of Class A common stock or shares of preferred stock, the holder will not have any rights as a holder of our shares of Class A common stock or shares of preferred stock, as the case may be, by virtue of ownership of warrants.

We may offer fractional shares of preferred stock, rather than full shares of preferred stock. If we do so, we may issue receipts for depositary shares that each represent a fraction of a share of a particular series of preferred stock. The prospectus supplement will indicate that fraction. The shares of preferred stock represented by depositary shares will be deposited under a depositary agreement between us and a bank depositary. The phrase “bank depositary” means a bank or trust company that meets certain requirements and is selected by us. Each owner of a depositary share will be entitled to all the rights and preferences of the preferred stock represented by the depositary share. The depositary shares will be evidenced by depositary receipts issued pursuant to the depositary agreement. Depositary receipts will be distributed to those persons purchasing the fractional shares of preferred stock in accordance with the terms of the offering.

We have summarized some common provisions of a depositary agreement and the related depositary receipts. The forms of the depositary agreement and the depositary receipts relating to any particular issue of depositary shares will be filed with the SEC each time we issue depositary shares, and you should read those documents for provisions that may be important to you.

If we pay a cash distribution or dividend on a series of preferred stock represented by depositary shares, the bank depositary will distribute such dividends to the record holders of such depositary shares. If the distributions are in property other than cash, the bank depositary will distribute the property to the record holders of the depositary shares. However, if the bank depositary determines that it is not feasible to make the distribution of property, the bank depositary may, with our approval, sell such property and distribute the net proceeds from such sale to the record holders of the depositary shares.

If we redeem a series of preferred stock represented by depositary shares, the bank depositary will redeem the depositary shares from the proceeds received by the bank depositary in connection with the redemption. The redemption price per depositary share will equal the applicable fraction of the redemption price per share of the preferred stock. If fewer than all the depositary shares are redeemed, the depositary shares to be redeemed will be selected by lot or pro rata as the bank depositary may determine.

Upon receipt of notice of any meeting at which the holders of the preferred stock represented by depositary shares are entitled to vote, the bank depositary will mail the notice to the record holders of the depositary shares relating to such preferred stock. Each record holder of these depositary shares on the record date (which will be the same date as the record date for the preferred stock) may instruct the bank depositary as to how to vote the preferred stock represented by such holder’s depositary shares. The bank depositary will endeavor, insofar as practicable, to vote the amount of the preferred stock represented by such depositary shares in accordance with such instructions, and we will take all action which the bank depositary deems necessary in order to enable the bank depositary to do so. The bank depositary will abstain from voting shares of the preferred stock to the extent it does not receive specific instructions from the holders of depositary shares representing such preferred stock.

The form of depositary receipt evidencing the depositary shares and any provision of the depositary agreement may be amended by agreement between the bank depositary and us. However, any amendment that materially and adversely alters the rights of the holders of depositary shares will not be effective unless such amendment has been approved by the holders of at least a majority of the depositary shares then outstanding. The depositary agreement may be terminated by the bank depositary or us only if (1) all outstanding depositary shares have been redeemed or (2) there has been a final distribution in respect of the preferred stock in connection with any liquidation, dissolution, or winding up of us and such distribution has been distributed to the holders of depositary shares.

We will pay all transfer and other taxes and governmental charges arising solely from the existence of the depositary arrangements. We will pay charges of the bank depositary in connection with the initial deposit of the preferred stock and any redemption of the preferred stock. Holders of depositary shares will pay other transfer and other taxes and governmental charges and any other charges, including a fee for the withdrawal of shares of preferred stock upon surrender of depositary receipts, as are expressly provided in the depositary agreement to be payable by such holders.

Except as may be provided otherwise in the applicable prospectus supplement, upon surrender of depositary receipts at the principal office of the bank depositary, subject to the terms of the depositary agreement, the owner of the depositary shares may demand delivery of the number of whole shares of preferred stock and all money and other property, if any, represented by those depositary shares. Partial shares of preferred stock will not be issued. If the depositary receipts delivered by the holder evidence a number of depositary shares in excess of the number of depositary shares representing the number of whole shares of preferred stock to be withdrawn, the bank depositary will deliver to such holder at the same time a new depositary receipt evidencing the excess number of depositary shares. Holders of preferred stock thus withdrawn may not thereafter deposit those shares under the depositary agreement or receive depositary receipts evidencing depositary shares therefor.

The bank depositary will forward to holders of depositary shares all reports and communications from us that are delivered to the bank depositary and that we are required to furnish to the holders of the preferred stock.

Neither the bank depositary nor we will be liable if we are prevented or delayed by law or any circumstance beyond its control in performing its obligations under the depositary agreement. The obligations of the bank depositary and us under the depositary agreement will be limited to performance in good faith of their respective duties under the depositary agreement, and we will not be obligated to prosecute or defend any legal proceeding in respect of any depositary shares or preferred stock unless satisfactory indemnity is furnished. We may rely upon written advice of counsel or accountants, or upon information provided by persons presenting preferred stock for deposit, holders of depositary shares or other persons believed to be competent and on documents believed to be genuine.

The bank depositary may resign at any time by delivering to us notice of its election to do so, and we may at any time remove the bank depositary. Any such resignation or removal will take effect upon the appointment of a successor bank depositary and its acceptance of such appointment. The successor bank depositary must be appointed within 60 days after delivery of the notice of resignation or removal and must be a bank or trust company meeting the requirements of the depositary agreement.

We may issue stock purchase contracts, including contracts obligating holders to purchase from us, and obligating us to sell to the holders, a specified number of shares of Class A common stock or other securities at a future date or dates, which we refer to in this prospectus as “stock purchase contracts.” The price per share of the securities and the number of shares of the securities may be fixed at the time the stock purchase contracts are issued or may be determined by reference to a specific formula set forth in the stock purchase contracts. The stock purchase contracts may require holders to secure their obligations under the stock purchase contracts in a specified manner. The stock purchase contracts also may require us to make periodic payments to such holders or vice versa, and those payments may be unsecured or refunded on some basis.

The stock purchase contracts, and, if applicable, collateral or depositary arrangements, relating to the stock purchase contracts, will be filed with the SEC in connection with the offering of stock purchase contracts. The prospectus supplement relating to a particular issue of stock purchase contracts will describe the terms of those stock purchase contracts, including the following:

We may issue units consisting of any combination of two or more securities described in this prospectus from time to time. The following description sets forth certain general terms and provisions of the units. Each unit may be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the holder of a unit would have the rights and obligations of a holder of each included security. The particular terms of the units and the extent, if any, to which the general provisions may apply to the units so offered will be described in the applicable prospectus supplement. The following description and any description of the units in the applicable prospectus supplement may not be complete and is subject to and qualified in its entirety by reference to the terms and provisions of the applicable unit agreement. A form of the unit agreement reflecting the particular terms and provisions of a series of offered units will be filed with the SEC in connection with the offering and incorporated by reference herein.

We may issue units from time to time in such amounts and in as many distinct series as we determine. We will issue each series of units under a unit agreement to be entered into between us and a unit agent to be designated in the applicable prospectus supplement. When we refer to a series of units, we mean all units issued as part of the same series under the applicable unit agreement.

We may issue units consisting of any combination of two or more securities described in this prospectus. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations of a holder of each included security. The unit agreement under which a unit is issued may provide that the securities included in the unit may not be held or transferred separately, at any time or at any time before a specified date.

The applicable prospectus supplement will describe the terms of the units offered pursuant to it, including one or more of the following:

We reserve the right to set forth in a prospectus supplement specific terms of the units that are not within the options and parameters set forth in this prospectus. To the extent that any particular terms of the units, units agreement, or units certificates described in a prospectus supplement differ from any of the terms described above, then the terms described above will be deemed to have been superseded by that prospectus supplement.

We may issue rights to our stockholders to purchase shares of our Class A common stock or preferred stock. We may offer rights separately or together with one or more additional rights, preferred stock, Class A common stock, or warrants, or any combination of those securities in the form of units, as described in the applicable prospectus supplement. Each series of rights will be issued under a separate rights agreement to be entered into between us and a bank or trust company, as rights agent. The rights agent will act solely as our agent in connection with the certificates relating to the rights of the series of certificates and will not assume any obligation or relationship of agency or trust for or with any holders of rights certificates or beneficial owners of rights. The following description sets forth certain general terms and provisions of the rights. The particular terms of the rights and the extent, if any, to which the general provisions may apply to the rights so offered will be described in the applicable prospectus supplement. To the extent that any particular terms of the rights, rights agreement, or rights certificates described in a prospectus supplement differ from any of the terms described below, then the terms described below will be deemed to have been superseded by that prospectus supplement. We encourage you to read the applicable rights agreement and rights certificate for additional information before you decide whether to purchase any of our rights.

We will provide in a prospectus supplement the following terms of the rights being issued:

Each right will entitle the holder of rights to purchase, for cash, the number of shares of Class A common stock or preferred stock at the exercise price provided in the applicable prospectus supplement. Rights may be exercised at any time up to the close of business on the expiration date for the rights provided in the applicable prospectus supplement.

Holders may exercise rights as described in the applicable prospectus supplement. Upon receipt of payment and the rights certificate properly completed and duly executed at the corporate trust office of the rights agent or any other office indicated in the prospectus supplement, we will, as soon as practicable, forward the shares of Class A common stock or preferred stock, as applicable, purchasable upon exercise of the rights. If less than all of the rights issued in any rights offering are exercised, we may offer any unsubscribed securities directly to persons other than stockholders, to or through agents, underwriters or dealers or through a combination of such methods, including pursuant to standby arrangements, as described in the applicable prospectus supplement.

The following is a summary of the material U.S. federal income tax considerations related to the purchase, ownership and disposition of our Class A common stock by a non-U.S. holder (as defined below), that holds our Class A common stock as a “capital asset” within the meaning of Section 1221 of the Internal Revenue Code of 1986, as amended (the “Code”) (generally, property held for investment). This summary is based on the provisions of the Code, U.S. Treasury regulations promulgated thereunder, administrative rulings and judicial decisions, all as in effect on the date hereof, and all of which are subject to change or differing interpretations, possibly with retroactive effect. We cannot assure you that a change in law will not significantly alter the tax considerations that we describe in this summary. We have not sought any ruling from the IRS with respect to the statements made and the positions and conclusions described in the following summary, and there can be no assurance that the IRS or a court will agree with such statements, positions and conclusions.

This summary does not address all aspects of U.S. federal income taxation that may be relevant to non-U.S. holders in light of their personal circumstances. In addition, this summary does not address the impact of the Medicare surtax on certain net investment income, U.S. federal estate or gift tax laws, any U.S. state or local or non-U.S. tax laws or any tax treaties. This summary also does not address all U.S. federal income tax considerations that may be relevant to particular non-U.S. holders in light of their personal circumstances or that may be relevant to certain categories of investors that may be subject to special rules, such as:

PROSPECTIVE INVESTORS SHOULD CONSULT WITH AND RELY SOLELY UPON THEIR OWN TAX ADVISORS WITH RESPECT TO THE APPLICATION OF THE U.S. FEDERAL INCOME TAX LAWS (INCLUDING ANY POTENTIAL FUTURE CHANGES THERETO) TO THEIR PARTICULAR SITUATION, AS WELL AS ANY TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF OUR CLASS A COMMON STOCK ARISING UNDER ANY OTHER TAX LAWS, INCLUDING U.S. FEDERAL ESTATE OR GIFT TAX LAWS OR UNDER THE LAWS OF ANY U.S. STATE OR LOCAL OR NON-U.S. TAXING JURISDICTION, OR UNDER ANY APPLICABLE INCOME TAX TREATY.

For purposes of this discussion, a “non-U.S. holder” is a beneficial owner of our Class A common stock that is not for U.S. federal income tax purposes a partnership or any of the following:

If a partnership (including an entity or arrangement treated as a partnership for U.S. federal income tax purposes) holds our Class A common stock, the tax treatment of a partner in the partnership generally will depend upon the status of the partner, the activities of the partnership and certain determinations made at the partner level. Accordingly, we urge partners in partnerships (including entities or arrangements treated as partnerships for U.S. federal income tax purposes) considering the purchase of our Class A common stock to consult with and rely solely upon their own tax advisors regarding the U.S. federal income tax considerations of the purchase, ownership and disposition of our Class A common stock by such partnership.

We do not expect to pay any distributions on our Class A common stock in the foreseeable future. However, in the event we do make distributions of cash or other property on our Class A common stock, such distributions will constitute dividends for U.S. federal income tax purposes to the extent paid from our current or accumulated earnings and profits, as determined under U.S. federal income tax principles. To the extent those distributions exceed our current and accumulated earnings and profits, the distributions will be treated as a non-taxable return of capital to the extent of the non-U.S. holder’s tax basis in our Class A common stock and thereafter as capital gain from the sale or exchange of such Class A common stock. See “—Gain on Sale or Other Taxable Disposition of Class A Common Stock.” Subject to the withholding requirements under FATCA (as defined below) and with respect to effectively connected dividends, each of which is discussed below, any distribution made to a non-U.S. holder on our Class A common stock generally will be subject to U.S. withholding tax at a rate of 30% of the gross amount of the distribution unless an applicable income tax treaty provides for a lower rate. To receive the benefit of a reduced treaty rate, a non-U.S. holder must provide the applicable withholding agent with an IRS Form W-8BEN or IRS Form W-8BEN-E (or other applicable or successor form) certifying qualification for the reduced rate.

Dividends paid to a non-U.S. holder that are effectively connected with a trade or business conducted by the non-U.S. holder in the United States (and, if required by an applicable income tax treaty, are treated as attributable to a permanent establishment maintained by the non-U.S. holder in the United States) generally will be taxed on a net income basis at the rates and in the manner generally applicable to United States persons. Such effectively connected dividends will not be subject to U.S. withholding tax if the non-U.S. holder satisfies certain certification requirements by providing the applicable withholding agent with a properly executed IRS Form W-8ECI certifying eligibility for exemption. If the non-U.S. holder is a corporation for U.S. federal income tax purposes, it may also be subject to a branch profits tax (at a 30% rate or such lower rate as specified by an applicable income tax treaty) on its effectively connected earnings and profits (as adjusted for certain items), which will include effectively connected dividends.

Subject to the discussion below under “—Backup Withholding and Information Reporting,” a non-U.S. holder generally will not be subject to U.S. federal income or withholding tax on any gain realized upon the sale or other taxable disposition of our Class A common stock unless:

A non-U.S. holder described in the first bullet point above will be subject to U.S. federal income tax at a rate of 30% (or such lower rate as specified by an applicable income tax treaty) on the amount of such gain, which generally may be offset by U.S. source capital losses provided the non-U.S. holder has timely filed U.S. federal income tax returns with respect to such losses.

A non-U.S. holder whose gain is described in the second bullet point above or, subject to the exceptions described in the next paragraph, the third bullet point above, generally will be taxed on a net income basis at the rates and in the manner generally applicable to United States persons. If the non-U.S. holder is a corporation for U.S. federal income tax purposes whose gain is described in the second bullet point above, then such gain would also be included in its effectively connected earnings and profits (as adjusted for certain items), which may be subject to a branch profits tax (at a 30% rate or such lower rate as specified by an applicable income tax treaty).

Generally a corporation is a USRPHC if the fair market value of its United States real property interests equals or exceeds 50% of the sum of the fair market value of its worldwide real property interests and its other assets used or held for use in a trade or business. We believe that we currently are not a USRPHC for U.S. federal income tax purposes, and we do not expect to become a USRPHC for the foreseeable future. However, in the event that we become a USRPHC, as long as our Class A common stock is and continues to be “regularly traded on an established securities market”(within the meaning of the U.S. Treasury regulations), only a non-U.S. holder that actually or constructively owns, or owned at any time during the shorter of the five-year period ending on the date of the disposition or the non-U.S. holder’s holding period for the Class A common stock, more than 5% of our Class A common stock will be treated as disposing of a United States real property interest and will be taxable on gain realized on the disposition of our Class A common stock as a result of our status as a USRPHC. If we were to become a USRPHC and our Class A common stock were not considered to be regularly traded on an established securities market, each non-U.S. holder (regardless of the percentage of stock owned) would be treated as disposing of a United States real property interest and would be subject to U.S. federal income tax on a taxable disposition of our Class A common stock (as described in the preceding paragraph), and a 15% withholding tax would apply to the gross proceeds from such disposition.

Non-U.S. holders should consult with their own tax advisors with respect to the application of the foregoing rules to their ownership and disposition of our Class A common stock, including regarding potentially applicable income tax treaties that may provide for different rules.

Any dividends paid to a non-U.S. holder must be reported annually to the IRS and to the non-U.S. holder. Copies of these information returns may be made available to the tax authorities in the country in which the non-U.S. holder resides or is established. Payments of dividends to a non-U.S. holder generally will not be subject to backup withholding if the non-U.S. holder establishes an exemption by properly certifying its non-U.S. status on an IRS Form W-8BEN or IRS Form W-8BEN-E (or other applicable or successor form).

Payments of the proceeds from a sale or other disposition by a non-U.S. holder of our Class A common stock effected by or through a U.S. office of a broker generally will be subject to information reporting and backup withholding (at the applicable rate) unless the non-U.S. holder establishes an exemption by properly certifying its non-U.S. status on an IRS Form W-8BEN or IRS Form W-8BEN-E (or other applicable or successor form) and certain other conditions are met. Information reporting and backup withholding generally will not apply to any payment of the proceeds from a sale or other disposition of our Class A common stock effected outside the United States by a non-U.S. office of a broker. However, unless such broker has documentary evidence in its records that the non-U.S. holder is not a United States person and certain other conditions are met, or the non-U.S. holder otherwise establishes an exemption, information reporting will apply to a payment of the proceeds of the disposition of our Class A common stock effected outside the United States by such a broker if it has certain relationships within the United States.

Backup withholding is not an additional tax. Rather, the U.S. federal income tax liability (if any) of persons subject to backup withholding will be reduced by the amount of tax withheld. If backup withholding results in an overpayment of taxes, a refund may be obtained, provided that the required information is timely furnished to the IRS.

Sections 1471 through 1474 of the Code, and the U.S. Treasury regulations and administrative guidance issued thereunder (“FATCA”), impose a 30% withholding tax on any dividends on our Class A common stock and, subject to the proposed U.S. Treasury regulations discussed below, on proceeds from sales or other dispositions of shares of our Class A common stock, if paid to a “foreign financial institution” or a “non-financial foreign entity” (each as defined in the Code) (including, in some cases, when such foreign financial institution or non-financial foreign entity is acting as an intermediary), unless (i) in the case of a foreign financial institution, such institution enters into an agreement with the U.S. government to withhold on certain payments and to collect and provide to the U.S. tax authorities substantial information regarding U.S. account holders of such institution (which includes certain equity and debt holders of such institution, as well as certain account holders that are non-U.S. entities with U.S. owners), (ii) in the case of a non-financial foreign entity, such entity certifies that it does not have any “substantial United States owners” (as defined in the Code) or provides the applicable withholding agent with a certification identifying the direct and indirect substantial United States owners of the entity (in either case, generally on an IRS Form W-8BEN-E), or (iii) the foreign financial institution or non-financial foreign entity otherwise qualifies for an exemption from these rules and provides appropriate documentation (such as an IRS Form W-8BEN-E). Foreign financial institutions located in jurisdictions that have an intergovernmental agreement with the United States governing these rules may be subject to different rules. Under certain circumstances, a holder might be eligible for refunds or credits of such taxes. While gross proceeds from a sale or other disposition of our Class A common stock paid after January 1, 2019, would have originally been subject to withholding under FATCA, proposed U.S. Treasury regulations provide that such payments of gross proceeds do not constitute withholdable payments. Taxpayers may generally rely on these proposed U.S. Treasury regulations until they are revoked or final U.S. Treasury regulations are issued. Non-U.S. holders are encouraged to consult with their own tax advisors regarding the effects of FATCA on an investment in our Class A common stock.

INVESTORS CONSIDERING THE PURCHASE OF OUR CLASS A COMMON STOCK SHOULD CONSULT WITH AND RELY SOLELY UPON THEIR OWN TAX ADVISORS REGARDING THE APPLICATION OF THE U.S. FEDERAL INCOME TAX LAWS (INCLUDING ANY POTENTIAL FUTURE CHANGES THERETO) TO THEIR PARTICULAR SITUATIONS AND THE APPLICABILITY AND EFFECT OF ANY OTHER TAX LAWS, INCLUDING U.S. FEDERAL ESTATE AND GIFT TAX LAWS AND ANY U.S. STATE OR LOCAL OR NON-U.S. TAX LAWS, AND TAX TREATIES.

The following is a summary of certain considerations associated with the acquisition and holding of shares of common stock by employee benefit plans that are subject to Title I of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), plans, individual retirement accounts and other arrangements that are subject to Section 4975 of the Code or employee benefit plans that are governmental plans (as defined in Section 3(32) of ERISA), certain church plans (as defined in Section 3(33) of ERISA), non-U.S. plans (as described in Section 4(b)(4) of ERISA) or other plans that are not subject to the foregoing but may be subject to provisions under any other federal, state, local, non-U.S. or other laws or regulations that are similar to such provisions of ERISA or the Code (collectively, “Similar Laws”), and entities whose underlying assets are considered to include “plan assets” of any such plan, account or arrangement (each, a “Plan”).

This summary is based on the provisions of ERISA and the Code (and related regulations and administrative and judicial interpretations) as of the date of this registration statement. This summary does not purport to be complete or comprehensive, and no assurance is or can be given that future legislation, court decisions, regulations, rulings or pronouncements will not significantly modify the requirements summarized below. Any of those changes may be retroactive and may thereby apply to transactions entered into prior to the date of their enactment or release, including the date of this prospectus. This discussion is general in nature and is not intended to be all inclusive, nor should it be construed as investment, legal or other advice.

ERISA and the Code impose certain duties on persons who are fiduciaries of a Plan subject to Title I of ERISA or Section 4975 of the Code (an “ERISA Plan”) and prohibit certain transactions involving the assets of an ERISA Plan and its fiduciaries or other interested parties. Under ERISA and the Code, any person who exercises any discretionary authority or control over the administration of an ERISA Plan or the management or disposition of the assets of an ERISA Plan, or who renders investment advice for a fee or other compensation to an ERISA Plan, is generally considered to be a fiduciary of the ERISA Plan.

In considering an investment in shares of common stock with a portion of the assets of any Plan, a fiduciary should consider the Plan’s particular circumstances and all of the facts and circumstances of the investment and determine whether the acquisition and holding of shares of common stock is in accordance with the documents and instruments governing the Plan and the applicable provisions of ERISA, the Code, or any Similar Law relating to the fiduciary’s duties to the Plan, including, without limitation:

Section 406 of ERISA and Section 4975 of the Code prohibit ERISA Plans from engaging in specified transactions involving plan assets with persons or entities who are “parties in interest,” within the meaning of ERISA, or “disqualified persons,” within the meaning of Section 4975 of the Code, unless an exemption is available. A party in interest or disqualified person who engages in a non-exempt prohibited transaction may be subject to excise taxes and other penalties and liabilities under ERISA and the Code. In addition, the fiduciary of the ERISA Plan that engages in such a non-exempt prohibited transaction may be subject to excise taxes, penalties and liabilities under ERISA and the Code. The acquisition and/or holding of shares of common stock by an ERISA Plan with respect to which the issuer, the initial purchaser, or a guarantor is considered a party in

interest or a disqualified person may constitute or result in a direct or indirect prohibited transaction under Section 406 of ERISA and/or Section 4975 of the Code, unless the investment is acquired and is held in accordance with an applicable statutory, class or individual prohibited transaction exemption.

Because of the foregoing, shares of common stock should not be acquired or held by any person investing “plan assets” of any Plan, unless such acquisition and holding will not constitute a non-exempt prohibited transaction under ERISA and the Code or a similar violation of any applicable Similar Laws.

Additionally, a fiduciary of a Plan should consider whether the Plan will, by investing in us, be deemed to own an undivided interest in our assets, with the result that we would become a fiduciary of the Plan and our operations would be subject to the regulatory restrictions of ERISA, including its prohibited transaction rules, as well as the prohibited transaction rules of the Code and any other applicable Similar Laws.

The Department of Labor (the “DOL”) regulations provide guidance with respect to whether the assets of an entity in which ERISA Plans acquire equity interests would be deemed “plan assets” under some circumstances. Under these regulations, an entity’s assets generally would not be considered to be “plan assets” if, among other things:

Due to the complexity of these rules and the excise taxes, penalties and liabilities that may be imposed upon persons involved in non-exempt prohibited transactions, it is particularly important that fiduciaries, or other persons considering acquiring and/or holding shares of our common stock on behalf of, or with the assets of, any Plan, consult with their counsel regarding the potential applicability of ERISA, Section 4975 of the Code and any Similar Laws to such investment and whether an exemption would be applicable to the acquisition and holding of shares of common stock. Purchasers of shares of common stock have the exclusive responsibility for ensuring that their acquisition and holding of shares of common stock complies with the fiduciary responsibility rules of ERISA and does not violate the prohibited transaction rules of ERISA, the Code or applicable Similar Laws. The sale of shares of common stock to a Plan is in no respect a representation by us or any of our affiliates or representatives that such an investment meets all relevant legal requirements with respect to investments by any such Plan or that such investment is appropriate for any such Plan.

We may sell the securities offered by this prospectus from time to time in one or more transactions, including without limitation:

In addition, we may enter into derivative or hedging transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. In connection with such a transaction, the third parties may sell securities covered by and pursuant to this prospectus and any accompanying prospectus supplement. If so, the third party may use securities borrowed from us or others to settle such sales and may use securities received from us to close out any related short positions. We may also loan or pledge securities covered by this prospectus and any accompanying prospectus supplement to third parties, who may sell the loaned securities or, in an event of default in the case of a pledge, sell the pledged securities pursuant to this prospectus and any accompanying prospectus supplement.

The prospectus supplement with respect to any offering of securities will include the following information:

If underwriters are used in the sale, the underwriters will acquire the securities for their own account. The underwriters may resell the securities from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. Underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. Unless we inform you otherwise in the applicable prospectus supplement, the obligations of the underwriters to purchase the securities will be subject to certain conditions, and the underwriters will be obligated to purchase all of the offered securities if they purchase any of them. The underwriters may change from time to time any public offering price and any discounts or concessions allowed or reallowed or paid to dealers.

We will describe the name or names of any underwriters, dealers or agents, any compensation they receive from us and the purchase price of the securities in a prospectus supplement relating to the securities.

In connection with the sale of the securities, underwriters may receive compensation from us or from purchasers of the securities, for whom they may act as agents, in the form of discounts, concessions or

commissions. Underwriters may sell the securities to or through dealers, and these dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as agents, which is not expected to exceed that customary in the types of transactions involved. Underwriters, dealers and agents that participate in the distribution of the securities may be deemed to be underwriters, and any discounts or commissions they receive from us, and any profit on the resale of the securities they realize may be deemed to be underwriting discounts and commissions, under the Securities Act.

Underwriters or agents could make sales in privately negotiated transactions and/or any other method permitted by law, including block trades, sales deemed to be an “at-the-market” offering, sales made directly on Nasdaq, the existing trading market for our common stock, or such other exchange or automated quotation system on which our securities trade, or sales made to or through a market maker other than on an exchange. The name of any such underwriter or agent involved in the offer and sale of our securities, the amounts sold, and the nature of its obligations to take our securities will be described in the applicable prospectus supplement. Unless we inform you otherwise in the applicable prospectus supplement, any agent will agree to use its reasonable best efforts to solicit purchasers for the period of its appointment.

We currently intend to list any shares of Class A common stock sold pursuant to this prospectus on Nasdaq. It is possible that one or more underwriters may make a market in a series of the securities, but underwriters will not be obligated to do so and may discontinue any market making at any time without notice. Therefore, we can give no assurance about the liquidity of or the trading market for any of the securities.

Under agreements we may enter into, we may indemnify underwriters, dealers, and agents who participate in the distribution of the securities against certain liabilities, including liabilities under the Securities Act, or contribute with respect to payments that the underwriters, dealers or agents may be required to make. Unless otherwise set forth in the applicable prospectus supplement, the obligations of any underwriters to purchase any of the securities will be subject to certain conditions precedent.

To facilitate the offering of securities, certain persons participating in the offering may engage in transactions that stabilize, maintain or otherwise affect the price of the securities. This may include over-allotments or short sales of the securities, which involve the sale by persons participating in the offering of more securities than we sold to them. In these circumstances, these persons would cover such over-allotments or short positions by making purchases in the open market or by exercising their over-allotment option, if any. In addition, these persons may stabilize or maintain the price of the securities by bidding for or purchasing securities in the open market or by imposing penalty bids, whereby selling concessions allowed to dealers participating in the offering may be reclaimed if securities sold by them are repurchased in connection with stabilization transactions. The effect of these transactions may be to stabilize or maintain the market price of the securities at a level above that which might otherwise prevail in the open market. These transactions may be discontinued at any time.

From time to time, we or our affiliates may engage in transactions with these underwriters, dealers and agents in the ordinary course of business. Underwriters may from time to time in the future provide investment banking services to us for which they have in the past received, and may in the future receive, customary fees.

If so indicated in a prospectus supplement, we will authorize underwriters or other persons acting as our agents to solicit offers by institutional investors to purchase securities pursuant to contracts providing for payment and delivery on a future date. We may enter contracts with commercial and savings banks, insurance companies, pension funds, investment companies, educational and charitable institutions and other institutional investors. The obligations of any institutional investor under such delayed delivery contract will be subject to the condition that its purchase of the offered securities will not be illegal at the time of delivery. The underwriters and other agents will not be responsible for the validity or performance of contracts.

We may sell the securities directly. In this case, no underwriters or agents would be involved. We may also sell the securities through agents designated by us from time to time. In the applicable prospectus supplement, we will name any agent involved in the offer or sale of the offered securities, and we will describe any commissions payable to the agent. Unless we inform you otherwise in the applicable prospectus supplement, any agent will agree to use its reasonable best efforts to solicit purchases for the period of its appointment.

We may sell the securities directly to institutional investors or others who may be deemed to be underwriters within the meaning of the Securities Act with respect to any sale of those securities. We will describe the terms of any sales of these securities in the applicable prospectus supplement.

We may also sell the securities offered by any applicable prospectus supplement in “at the market offerings” within the meaning of Rule 415(a)(4) of the Securities Act, to or through a market maker or into an existing trading market, on an exchange or otherwise.

Securities may also be offered and sold, if so indicated in the applicable prospectus supplement, in connection with a remarketing upon their purchase, in accordance with a redemption or repayment pursuant to their terms, or otherwise, by one or more remarketing firms, acting as principals for their own accounts or as agents for us. Any remarketing firm will be identified and the terms of its agreements, if any, with us and its compensation will be described in the applicable prospectus supplement.

If we so indicate in the applicable prospectus supplement, we may authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase securities from us at the public offering price under delayed delivery contracts. These contracts would provide for payment and delivery on a specified date in the future.

The contracts would be subject only to those conditions described in the applicable prospectus supplement. The applicable prospectus supplement will describe the commission payable for solicitation of those contracts.

We may have agreements with the underwriters, dealers, agents and remarketing firms to indemnify them against certain civil liabilities, including liabilities under the Securities Act, or to contribute with respect to payments that the underwriters, dealers, agents or remarketing firms may be required to make. Underwriters, dealers, agents and remarketing firms may be customers of, engage in transactions with or perform services for us in the ordinary course of their businesses.

The validity of our securities offered by this prospectus will be passed upon for us by Vinson & Elkins L.L.P., New York, New York.

The audited financial statements of Stronghold Digital Mining, Inc. incorporated by reference into this registration statement have been so included in reliance upon the report of Urish Popeck & Co., LLC, independent registered public accounting firm, upon the authority of said firm as experts in accounting and auditing.