Solaris Energy Infrastructure, Inc. Class A common stock, par value $0.01 per share UNDERWRITING AGREEMENT

Exhibit 1.2

Class A common stock, par value $0.01 per share

October 6, 2025

To the Representative named in Schedule I hereto

for the Underwriters named in Schedule II hereto

Ladies and Gentlemen:

Solaris Energy Infrastructure, Inc., a Delaware corporation (the “Company”), is entering into this Agreement with the several underwriters named in Schedule II hereto (the “Underwriters” and to the extent there is only a single underwriter, the term “Underwriters” shall be deemed to refer to the single Underwriter, mutatis mutandis), for whom ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC (the “Representative”) is acting as representative, with respect to the offer and sale of the number of shares of its Class A common stock, par value $0.01 per share set forth in Schedule I hereto (the “Shares”). The shares of Class A common stock, par value $0.01 per share of the Company outstanding as of the day hereof and to be outstanding immediately after giving effect to the sales contemplated hereby are hereinafter referred to as the “Common Stock.” The offer and sale of the Shares (the “Offering”) have been registered pursuant to the Registration Statement (as defined below), and are being offered and sold pursuant to the Registration Statement and the Prospectus (as defined below). For the avoidance of doubt, there is no new issuance of Shares in the Offering.

The Company is concurrently offering (the “Notes Offering”) up to $650,000,000 principal amount (or $747,500,000 million if the several underwriters named in Schedule I (the “Notes Offering Underwriters”, and to the extent there is only a single underwriter, the term “Underwriters” shall be deemed to refer to the single Notes Offering Underwriter, mutatis mutandis) of the Notes Underwriting Agreement (as defined below) exercise their option to purchase additional notes in full) of its 0.25% Convertible Senior Notes due 2031 (the “Notes”) to be issued pursuant to the provisions of an Indenture (the “Base Indenture”), dated as of May 2, 2025, between the Company and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), as supplemented by that certain Second Supplemental Indenture, to be dated as of the Closing Date (as defined in Section 4), between the Company and the Trustee (the “Second Supplemental Indenture” and together with the Base Indenture, the “Indenture”). On the date hereof, the Company will enter into an underwriting agreement (the “Notes Underwriting Agreement”) with ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC, as representative of the Underwriters (as defined in the Notes Underwriting Agreement). The Notes Offering is being made pursuant to a separate prospectus supplement and accompanying base prospectus on Form S-3ASR (File No. 333-290735) (and not pursuant to the same prospectus supplement or the accompanying base prospectus pursuant to which the Shares are being offered).

In connection with the Notes Offering, the Company is separately entering into privately negotiated capped call transactions with one or more counterparties, which may include the Underwriters, the Notes Offering Underwriters, their respective affiliates and/or other financial institutions (each, a “Capped Call Counterparty”), in each case pursuant to a capped call confirmation (each, a “Base Capped Call Confirmation”), each dated the date hereof, and in connection with the issuance of any Additional Securities, the Company and each Capped Call Counterparty may enter into additional capped call transactions, in each case, pursuant to an additional capped call confirmation (each, an “Additional Capped Call Confirmation”), each to be dated the date on which the option granted to the Notes Offering Underwriters to purchase such Additional Securities is exercised (the “Additional Capped Call Confirmations”, and together with the Base Capped Call Confirmations, the “Capped Call Confirmations”).

Concurrently with the Notes Offering , the Underwriters, each acting severally on behalf of itself and/or its affiliates, will offer the Shares to facilitate hedging transactions by certain investors subscribing for the Notes (“Convertible Arbitrage Investors”). The Shares will be borrowed from non-affiliate third parties and will be: (x) purchased by an Underwriter from certain Convertible Arbitrage Investors who have sold them short to such Underwriter in connection with the Notes Offering, and/or (y) sold short by the Underwriters to facilitate concurrent privately negotiated transactions between one of the Underwriters (or its affiliates) and certain Convertible Arbitrage Investors seeking a short exposure to shares of Common Stock through a derivative, in an equal notional amount.

The Company has filed with the Securities and Exchange Commission (the “Commission”) a registration statement on Form S-3 (the file number of which is set forth in Schedule I hereto), including a preliminary prospectus, relating to the securities (the “Shelf Securities”), including the Shares, to be sold from time to time by or on behalf of the Company. The registration statement relating to the Shares, as amended to the date of this Agreement, including the information (if any) deemed to be part of the registration statement at the time of effectiveness pursuant to Rule 430A or Rule 430 B under the U.S. Securities Act of 1933, as amended (the “Securities Act”), is hereinafter referred to as the “Registration Statement,” and the related prospectus covering the Shelf Securities dated November 18, 2024 in the form first used to confirm sales of the Shares (or in the form first made available to the Underwriters by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “Base Prospectus.” The Base Prospectus, as supplemented by the prospectus supplement specifically relating to the Shares in the form first used to confirm sales of the Shares (or in the form first made available to the Underwriters by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “Prospectus,” and the term “preliminary prospectus” means the preliminary prospectus supplement specifically related to the Shares dated October 6, 2025 (including the Base Prospectus).

For purposes of this Agreement, “free writing prospectus” has the meaning set forth in Rule 405 under the Securities Act, “Time of Sale Prospectus” means the preliminary prospectus together with the documents and pricing information set forth opposite the caption “Time of Sale Prospectus” in Schedule I hereto, and “broadly available road show” means a “bona fide electronic road show” as defined in Rule 433(h)(5) under the Securities Act that has been made available without restriction to any person. As used herein, the terms “Registration Statement,” “Base Prospectus,”

“preliminary prospectus,” “Time of Sale Prospectus” and “Prospectus” shall include the documents, if any, incorporated by reference therein as of the date hereof. The terms “supplement,” “amendment,” and “amend” as used herein with respect to the Registration Statement, the Base Prospectus, the Time of Sale Prospectus, any preliminary prospectus or the Prospectus shall include all documents subsequently filed by the Company with the Commission pursuant to the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”), that are deemed to be incorporated by reference therein.

1. Representations and Warranties. The Company represents and warrants to and agrees with each of the Underwriters that:

(a) The Registration Statement has become effective; no stop order suspending the effectiveness of the Registration Statement is in effect, and no proceedings for such purpose or pursuant to Section 8A under the Securities Act are pending before or threatened by the Commission. If the Registration Statement is an automatic shelf registration statement as defined in Rule 405 under the Securities Act, the Company is a well-known seasoned issuer (as defined in Rule 405 under the Securities Act) eligible to use the Registration Statement as an automatic shelf registration statement and the Company has not received notice that the Commission objects to the use of the Registration Statement as an automatic shelf registration statement. The Company has complied with each request, if any, from the Commission for additional information.

(b) (i) Each document, if any, filed or to be filed pursuant to the Exchange Act and incorporated by reference in the Time of Sale Prospectus or the Prospectus complied or will comply when so filed in all material respects with the Exchange Act and the applicable rules and regulations of the Commission thereunder, (ii) each part of the Registration Statement, when such part became effective, did not contain, and each such part, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (iii) the Registration Statement as of the date hereof does not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (iv) the Registration Statement and the Prospectus comply and, as amended or supplemented, if applicable, will comply in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder, (v) the Time of Sale Prospectus does not, and at the time of each sale of the Shares in connection with the Offering when the Prospectus is not yet available to prospective purchasers and at October 8, 2025 (as such date may be postponed by agreement between the Underwriters and the Company, the “Closing Date”), the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, (vi) each broadly available road show, if any, when considered together with the Time of Sale Prospectus, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances

under which they were made, not misleading and (vii) the Prospectus does not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, except that the representations and warranties set forth in this paragraph do not apply to statements or omissions in the Registration Statement, the Time of Sale Prospectus or the Prospectus based upon information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representative expressly for use therein.

(c) The Company is not an “ineligible issuer” in connection with the Offering pursuant to Rules 164, 405 and 433 under the Securities Act. Any free writing prospectus that the Company is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Each free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or that was prepared by or on behalf of or used or referred to by the Company complies or will comply in all material respects with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Except for the free writing prospectuses, if any, identified in Schedule I hereto forming part of the Time of Sale Prospectus, and electronic road shows, if any, each furnished to the Representative before first use, the Company has not prepared, used or referred to, and will not, without the Representative’s prior consent, prepare, use or refer to, any free writing prospectus.

(d) The Company has been duly incorporated and is validly existing as a corporation and in good standing under the laws of the State of Delaware, with power and authority (corporate and other) to own its properties and conduct its business as described in the Prospectus and Time of Sale Prospectus; and the Company is duly qualified to do business as a foreign corporation in good standing in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except where the failure to be duly qualified or in good standing would not, individually or in the aggregate, reasonably be expected to have a material adverse effect on the management, condition (financial or other), results of operations, business, properties or prospects of the Company and its subsidiaries taken as a whole (a “Material Adverse Effect”); all such jurisdictions are listed on Schedule III hereto.

(e) The Company owns 70.5% of the issued and outstanding units of Solaris Energy Infrastructure, LLC, a Delaware limited liability company, and the entities listed on Schedule IV hereto are the only direct or indirect subsidiaries (as defined in Rule 1-02(w) of Regulation S-X) of the Company (references herein to “Subsidiaries” refer to the Company’s indirect and direct subsidiaries as listed on Schedule IV). Each such subsidiary has been duly incorporated or formed and is existing and in good standing under the laws of the jurisdiction of its incorporation or formation, with corporate, limited liability company, limited partnership, and/or other similar power and authority to own its properties and conduct its business as described in the Time of Sale Prospectus and the Prospectus; and each subsidiary listed on Schedule IV hereto is duly qualified to do business as a foreign corporation or other entity in good standing in all other

jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except where the failure to be duly qualified or in good standing would not, individually or in the aggregate, have a Material Adverse Effect; all such jurisdictions are listed on Schedule IV hereto; all of the issued and outstanding capital stock or other ownership interests of each such Subsidiary has been duly authorized and validly issued and, in the case of any such corporation, is fully paid and nonassessable; and the capital stock or other ownership interests of each such Subsidiary owned by the Company, directly or indirectly, is owned free from liens, encumbrances and defects, other than those arising under (a) the Senior Secured Term Loan Agreement, dated as of September 11, 2024, as amended April 28, 2025, by and among Solaris Energy Infrastructure, LLC, as borrower, the Company, as Parent, the other Obligors party thereto, the Lenders party thereto and Banco Santander, S.A. New York Branch, as administrative agent (as amended, the “Term Loan Agreement”), (b) the Loan, Security and Guaranty Agreement, dated as of October 2, 2024, as amended April 28, 2025, among Solaris Energy Infrastructure, LLC, Solaris Oilfield Site Services Operating, LLC, Solaris Oilfield Early Property, LLC, Solaris Oilfield Site Services Personnel LLC, Solaris Logistics, LLC, Solaris Oilfield Technologies, LLC, Solaris Transportation, LLC and Mobile Energy Rentals LLC (“MER”), as Borrowers, the Company, and Bank of America, N.A. as agent for the lenders (the “Revolving Credit Facility” ), and (c) the Loan and Security Agreement, dated as of May 23, 2025, by and among Stateline Power, LLC and Stonebriar Commercial Finance LLC, as lender, administrative agent, and collateral agent (the “Stateline Term Loan”, together with the Term Loan Agreement and the Revolving Credit Facility, the “Debt Agreements”) and (d) the Amended and Restated Limited Liability Company Agreement of Stateline Power, LLC, dated as of April 28, 2025.

(f) The Shares and all other outstanding shares of capital stock of the Company have been duly authorized; the authorized equity capitalization of the Company is as set forth in the Time of Sale Prospectus and the Prospectus under the heading “Capitalization”; all outstanding shares of capital stock of the Company (including the Shares) have been, and, when the Shares have been delivered in accordance with this Agreement on the Closing Date, such Shares will be, validly issued, fully paid and nonassessable, and will conform to the information in the Time of Sale Prospectus and to the description of such Shares contained in the Prospectus in all material respects; the stockholders of the Company have no preemptive rights with respect to the Shares; and none of the outstanding shares of capital stock of the Company have been issued in violation of any preemptive or similar rights of any security holder. Except as disclosed in the Registration Statement, the Time of Sale Prospectus and the Prospectus there are no outstanding (A) securities or obligations of the Company convertible into or exchangeable for any capital stock of the Company, (B) warrants, rights or options to subscribe for or purchase from the Company any such capital stock or any such convertible or exchangeable securities or obligations or (C) obligations of the Company to issue or sell any shares of capital stock, any such convertible or exchangeable securities or obligations or any such warrants, rights or options. The Company has not, directly or indirectly, offered or sold any of the Shares by means of any “prospectus” (within the meaning of the Securities Act and the rules and regulations of the Commission) or used any “prospectus” or made any offer (within the meaning of the Securities Act and the rules and regulations of the Commission) in connection with the offer or sale of the Shares, in each case other than through any preliminary prospectus, the Prospectus or any permitted free writing prospectus.

(g) Except as disclosed in the Time of Sale Prospectus and the Prospectus, there are no contracts, agreements or understandings between the Company and any person granting such person the right to require the Company to file a registration statement under the Securities Act with respect to any securities of the Company owned or to be owned by such person or to require the Company to include such securities in the securities registered pursuant to a Registration Statement or in any securities being registered pursuant to any other registration statement filed by the Company under the Securities Act (collectively, “registration rights”), and any person to whom the Company has granted registration rights has agreed not to exercise such rights until after the expiration of the Restricted Period referred to in Section 6(g) hereof.

(h) The Shares have been approved for listing on The New York Stock Exchange.

(i) No consent, approval, authorization, or order of, or filing or registration with, any person (including any governmental agency or body or any court) is required to be obtained or made by the Company for the consummation of the transactions contemplated by this Agreement in connection with the sale of the Shares, except (i) such as have been obtained, (ii) where the failure of the Company to obtain or make any such consent, approval, authorization, order, filing or registration would not reasonably be expected to have a Material Adverse Effect, or (iii) such as have been made or as may be required under state or foreign securities or “Blue Sky” laws or by the Financial Industry Regulatory Authority (“FINRA”).

(j) Except as otherwise disclosed in the Time of Sale Prospectus and the Prospectus, the Company and each of its Subsidiaries have good and marketable title to all the real property (exclusive of easements, rights of way and other similar instruments) and the personal property reflected as owned in the financial statements referred to in Section 1(z) hereof, in each case free and clear of any security interests, mortgages, liens, encumbrances, equities, claims and other defects, except (i) as disclosed in the Time of Sale Prospectus and the Prospectus, (ii) as exist pursuant to the Debt Agreements, (iii) liens for real property taxes, assessments and other governmental charges that are not delinquencies or that are currently being contested in good faith by appropriate proceedings and (iv) such as do not materially interfere with the use made or proposed to be made of such property by the Company or such Subsidiary. The real property, improvements, equipment and personal property held under lease by the Company or any Subsidiary are held under valid and enforceable leases with no terms or provisions that would materially interfere with the use made or to be made thereof by them.

(k) The execution, delivery and performance of this Agreement and the sale of the Shares as set forth in the Time of Sale Prospectus and the Prospectus will not result in a breach or violation of any of the terms and provisions of, or constitute, or with the giving of notice or lapse of time, would constitute, a default under, or result in the imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its Subsidiaries pursuant to, (i) their respective certificate of formation, limited liability company agreement, limited partnership agreement, charter, or by-laws or similar organizational documents of the Company or any of its Subsidiaries, (ii) any statute, rule, regulation or order of any governmental agency or body or any court, domestic or foreign, having jurisdiction over the Company or any of its Subsidiaries or any of their properties, or (iii) any agreement or instrument to which the Company or any of its Subsidiaries is a party or by which the Company or any of its Subsidiaries is bound or to which any of the properties of the Company or any of its Subsidiaries is subject, except in the case of clauses (ii) and (iii) as would not reasonably be expected to have a Material Adverse Effect.

(l) Neither the Company nor any of its Subsidiaries is (i) in violation of its respective certificate of formation, limited liability company agreement, limited partnership agreement, charter, by-laws or similar organizational documents, (ii) in default (or with the giving of notice or lapse of time would be in default) under any existing obligation, agreement, covenant or condition contained in any indenture, loan agreement, mortgage, lease or other agreement or instrument to which any of them is a party or by which any of them is bound or to which any of the properties of any of them is subject, or (iii) in violation of any law or statute or any judgment, order, rule or regulation of any court or arbitrator or governmental or regulatory authority, except, in the case of clauses (ii) and (iii) above, for any such default or violation that would not reasonably be expected to have a Material Adverse Effect.

(m) This Agreement has been duly authorized, executed and delivered by the Company.

(n) The Company and its Subsidiaries possess, and are in compliance with the terms of, all adequate certificates, authorizations, franchises, licenses and permits issued by appropriate federal, state, local or foreign regulatory bodies (collectively, “Licenses”) necessary or material to the conduct of the business in the manner described in the Time of Sale Prospectus and the Prospectus to be conducted by them, except where the failure to have obtained the same would not reasonably be expected to have a Material Adverse Effect. The Company and its Subsidiaries are in compliance with the terms and conditions of all such Licenses, except where the failure to so comply would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, and have not received any notice of proceedings relating to the revocation or modification of any Licenses that, if determined adversely to the Company or any of its Subsidiaries, would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(o) No labor dispute with the employees of the Company or any of its Subsidiaries exists or, to the knowledge of the Company, is imminent that would reasonably be expected to have a Material Adverse Effect or except as described in the Time of Sale Prospectus and the Prospectus.

(p) The Company and its Subsidiaries own, possess or can acquire on reasonable terms sufficient rights to trademarks, trade names, patent rights, copyrights, domain names, trade secrets, know-how, rights in confidential information and other intellectual property and similar rights, including registrations and applications for registration thereof (collectively, “Intellectual Property Rights”) necessary or material to the conduct of the business now conducted or proposed to be conducted by them as described in the Time of Sale Prospectus or the Prospectus. Except as disclosed in the Time of Sale Prospectus or the Prospectus (i) there is no material infringement, misappropriation or other violation of a third party’s Intellectual Property Rights by the Company or its Subsidiaries; (ii) there is no pending or, to the knowledge of the Company, threatened action, suit, proceeding or claim by others challenging the Company’s or any Subsidiary’s rights in or to, or the violation of any of the terms of, any of their Intellectual Property Rights, and the Company is unaware of any facts which would form a reasonable basis for any such claim; (iii) there is no pending action, suit, proceeding or claim by others challenging the validity or enforceability of any Intellectual Property Rights owned by the Company, and the Company is unaware of any facts which would form a reasonable basis for any such action, suit, proceeding or claim; (iv) there is no pending or, to the knowledge of the Company, threatened action, suit, proceeding or claim by others that the Company or any Subsidiary infringes, misappropriates or otherwise violates or conflicts with any Intellectual Property Rights or other proprietary rights of others and the Company is unaware of any other fact which would form a reasonable basis for any such claim; and (v) none of the Intellectual Property Rights used by the Company or its Subsidiaries in their businesses has been obtained or is being used by the Company or its Subsidiaries in violation of any contractual obligation binding on the Company or any of its Subsidiaries in violation of the rights of any person, except in each case covered by clauses (i) through (v), except as would not, if determined adversely to the Company or any of its Subsidiaries, individually or in the aggregate, have a Material Adverse Effect.

(q) Except as disclosed in the Time of Sale Prospectus and the Prospectus, (a)(i) neither the Company nor any of its Subsidiaries is in violation of, and does not have any liability under, any federal, state, local or non-U.S. statute, law, rule, regulation, ordinance, code, other requirement or rule of law (including common law), or decision or order of any domestic or foreign governmental agency, governmental body or court, relating to pollution, to the use, handling, generation, transportation, treatment, storage, discharge, disposal or release of, or exposure to, Hazardous Substances (as defined below), to the protection or restoration of the environment or natural resources, to human health and safety (as such relates to exposure to Hazardous Substances), and to natural resource damages (collectively, “Environmental Laws”) that would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, (ii) to the knowledge of the Company, neither the Company nor any of its Subsidiaries own, lease, occupy, operate or use any real property contaminated with Hazardous Substances, (iii) neither the Company nor any of its Subsidiaries is conducting or funding any investigation, remediation, remedial action or monitoring of actual or suspected Hazardous Substances in the environment, (iv) to the knowledge of the Company, neither the Company nor any of its Subsidiaries is liable or allegedly liable for any release or threatened release of Hazardous Substances, including at any off site storage, treatment,

or disposal site, (v) neither the Company nor any of its Subsidiaries is subject to any pending, or to the Company’s knowledge, threatened, claim by any governmental agency or governmental body or person arising under Environmental Laws or relating to the release of or exposure to Hazardous Substances, and (vi) the Company and its Subsidiaries have received, are in compliance with all, and have no liability under any, permits, licenses, authorizations, identification numbers or other approvals required under applicable Environmental Laws to conduct their business, except in each case covered by clauses (ii) – (vi) such as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; (b) to the knowledge of the Company and its Subsidiaries, there are no facts or circumstances that would reasonably be expected to result in a violation of, liability under, or claim pursuant to any Environmental Law that would reasonably be expected to have a Material Adverse Effect; and (c) in the ordinary course of its business, each of the Company and its Subsidiaries periodically evaluate the effect, including associated costs and liabilities, of Environmental Laws currently in effect on the business, properties, results of operations and financial condition of the Company and its Subsidiaries, and, on the basis of such evaluation, the Company and its Subsidiaries have reasonably concluded that such Environmental Laws are not, individually or in the aggregate, reasonably expected to have a Material Adverse Effect. For purposes of this subsection “Hazardous Substances” means (A) petroleum and petroleum products, by-products or breakdown products, mold, radioactive materials, asbestos and asbestos-containing materials, per- and polyfluoroalkyl substances, and polychlorinated biphenyls, and (B) any other chemical, material or substance defined or regulated as toxic or hazardous or as a pollutant, contaminant or waste under Environmental Laws.

(r) The statements in the Registration Statement, the Time of Sale Prospectus and the Prospectus under the headings “The Concurrent Notes Offering,” “Description of Concurrent Capped Call Transactions,” “Description of Capital Stock” and “Material U.S. Federal Income Tax Considerations For Non-U.S. Holders”, insofar as such statements summarize legal matters, agreements, documents or proceedings discussed therein, are correct in all material respects.

(s) Any third-party statistical and market-related data included in or incorporated by reference in a Registration Statement, preliminary prospectus, the Time of Sale Prospectus or the Prospectus are based on or derived from sources that the Company believes to be reliable and accurate.

(t) Except as set forth in the Time of Sale Prospectus and the Prospectus, the Company, its subsidiaries and the Company’s Board of Directors (the “Board”) are in compliance with ▇▇▇▇▇▇▇▇-▇▇▇▇▇ and all applicable Exchange Rules. The Company maintains a system of internal controls, including, but not limited to, disclosure controls and procedures, internal controls over accounting matters and financial reporting, an internal audit function and legal and regulatory compliance controls (collectively, “Internal Controls”) that comply with the Securities Laws (as defined below) and are sufficient to provide reasonable assurances that (i) transactions are executed in accordance with management’s general or specific authorizations, (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with

U.S. Generally Accepted Accounting Principles (“GAAP”) and to maintain accountability for assets, (iii) access to assets is permitted only in accordance with management’s general or specific authorization, and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. The Internal Controls are overseen by the Audit Committee (the “Audit Committee”) of the Board in accordance with Exchange Rules. The Company has not disclosed or reported to the Audit Committee or the Board a significant deficiency, material weakness, change in Internal Controls or fraud involving management or other employees who have a significant role in Internal Controls on any violation of, or failure to comply with, the Securities Laws.

(u) “Securities Laws” means, collectively, the ▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act of 2002, as amended and all rules and regulations promulgated thereunder or implementing the provisions thereof (“▇▇▇▇▇▇▇▇-▇▇▇▇▇”), the Securities Act, the Exchange Act, the rules and regulations of the Commission, the auditing principles, rules, standards and practices applicable to auditors of “issuers” (as defined in ▇▇▇▇▇▇▇▇-▇▇▇▇▇) promulgated or approved by the Public Company Accounting Oversight Board (United States) (the “PCAOB”) and, as applicable, the rules of The New York Stock Exchange and The Nasdaq Stock Market LLC (“Exchange Rules”).

(v) Except as disclosed in the Time of Sale Prospectus and the Prospectus, there are no pending actions, suits or proceedings (including any inquiries or investigations by any court or governmental agency or body, domestic or foreign) against or affecting the Company, any of its Subsidiaries or any of their respective properties that, if determined adversely to the Company or any of its Subsidiaries, would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, or would materially and adversely affect the ability of the Company to perform its obligations under this Agreement; and no such actions, suits or proceedings (including any inquiries or investigations by any court or governmental agency or body, domestic or foreign) are threatened or, to the Company’s knowledge, contemplated.

(w) Financial Statements.

(i) The historical financial statements included or incorporated by reference in each Registration Statement, the Time of Sale Prospectus and the Prospectus present fairly in all material respects the financial position of the Company and its consolidated Subsidiaries as of the dates shown and their results of operations and cash flows of the Company and its Subsidiaries for the periods shown. Except as disclosed in the Time of Sale Prospectus and the Prospectus, such financial statements comply as to form in all material respects with the applicable accounting requirements of Regulation S-X and have been prepared in all material respects in conformity with GAAP applied on a consistent basis throughout the periods involved except as otherwise stated therein. BDO USA, P.C. has certified the audited financial statements of the Company included or incorporated by reference in the Registration Statement, Time of Sale Prospectus and the Prospectus, and is an independent registered public accounting firm with respect to the Company and its Subsidiaries within the rules and regulations of the Commission and as required by the Securities Act and the applicable rules and guidance from the PCAOB. The Company does not have any material liabilities or obligations, direct or contingent (including any off-balance sheet obligations or any “variable interest entities” within the meaning of Financial Accounting Standards Board Interpretation No. 46), not disclosed in the Registration Statement, the Time of Sale Prospectus and the Prospectus.

(ii) The unaudited pro forma financial statements and the related notes thereto included or incorporated by reference in each Registration Statement, the Time of Sale Prospectus and the Prospectus present fairly in all material respects the information contained therein and have been properly presented on the bases described therein, and the assumptions used in the preparation thereof are reasonable and the adjustment used therein are appropriate to give effect to the transactions and circumstances referred to therein. The pro forma adjustments comply as to form in all material respects with the applicable accounting requirements of Rule 11-02 of Regulation S-X under the Securities Act and the pro forma adjustments have been properly applied to the historical amounts in the compilation of those statements.

(iii) BDO USA, P.C. has certified the audited financial statements of MER included or incorporated by reference in the Registration Statement, Time of Sale Prospectus and the Prospectus, and are certified public accountants with respect to MER under Section 1.200 of the American Institute of Certified Public Accountants Code of Professional Conduct, and its interpretations and rulings.

(x) The interactive data in eXtensible Business Reporting Language included or incorporated by reference in the Time of Sale Prospectus and the Prospectus fairly presents the information called for in all material respects and is prepared in accordance with the Commission’s rules and guidelines applicable thereto.

(y) Except as disclosed in the Time of Sale Prospectus and the Prospectus, since the end of the period covered by the latest audited financial statements included in the Time of Sale Prospectus and the Prospectus (i) there has been no change, nor any development or event involving a prospective change, in the condition (financial or otherwise), results of operations, business, properties or prospects of the Company and its Subsidiaries, taken as a whole, that is material and adverse, (ii) there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock, (iii) there has been no material adverse change in the capital stock, short-term indebtedness, long-term indebtedness, net current assets or net assets of the Company or any of its Subsidiaries, taken as a whole, (iv) there has been no obligation, direct or contingent, that is material to the Company or any of its Subsidiaries taken as a whole, incurred by the Company or any of its Subsidiaries, except obligations incurred in the ordinary course of business and (v) neither the Company nor any of its Subsidiaries has sustained any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor disturbance or dispute or any action, order or decree of any court or arbitrator or governmental or regulatory authority.

(z) The Company is not required to register as an “investment company” as defined in the Investment Company Act of 1940, as amended (the “Investment Company Act”).

(aa) No “nationally recognized statistical rating organization” as such term is defined for purposes of Section 3(a)(62) of the Exchange Act has imposed (or has informed the Company or any of its Subsidiaries that it is considering imposing) any condition (financial or otherwise) on the Company’s or any of its Subsidiaries’ retaining any rating assigned to the Company or any of its Subsidiaries or any securities of the Company or any of its Subsidiaries or (ii) has indicated to the Company or any of its Subsidiaries that it is considering any of the actions described in Section 4(a)(ii) hereof.

(bb) Except as disclosed in the Registration Statement, the Time of Sale Prospectus and the Prospectus, the Company and its Subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as the Company reasonably believes are adequate for the conduct of their business. All such policies of insurance insuring the Company or any of its Subsidiaries or their respective businesses, assets, employees, officers and directors are in full force and effect. The Company and its Subsidiaries are in compliance with the terms of such policies and instruments in all material respects; and there are no material claims by the Company or its Subsidiaries under any such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause. Neither the Company nor any such Subsidiary has been refused any insurance coverage sought or applied for; neither the Company nor any such Subsidiary has any reason to believe that any of them will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not reasonably be expected to have a Material Adverse Effect, except as disclosed in the Registration Statement, the Time of Sale Prospectus and the Prospectus.

(cc) The Company and its Subsidiaries have filed all U.S. federal, state and local and non-U.S. tax returns that are required to be filed or have requested extensions thereof (except in any case in which the failure so to file would not reasonably be expected to have a Material Adverse Effect); and, except as set forth in the Time of Sale Prospectus and the Prospectus, the Company and its Subsidiaries have paid all taxes (including any assessments, fines or penalties) required to be paid by them, except for any such taxes, assessments, fines or penalties currently being contested in good faith or as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(dd) No relationship, direct or indirect, exists between or among the Company or its Subsidiaries on the one hand, and the directors, officers, stockholders, customers or suppliers of the Company or its Subsidiaries on the other hand, which is required to be described in the Time of Sale Prospectus which is not so described therein. The Prospectus will contain the same description of the matters set forth in the preceding sentence contained in the Time of Sale Prospectus.

(ee) None of the Company or any of its subsidiaries or affiliates, or any director, officer, or employee thereof, or, to the Company’s knowledge, any agent or representative of the Company or of any of its subsidiaries or affiliates, has taken or will take any action in furtherance of an offer, payment, promise to pay, or authorization or approval of the payment, giving or receipt of money, property, gifts or anything else of value, directly or indirectly, to any person to improperly influence official action by that person for the benefit of the Company or its subsidiaries or affiliates, or to otherwise secure any improper advantage, or to any person in violation of (a) the U.S. Foreign Corrupt Practices Act of 1977, (b) the UK Bribery Act 2010, and (c) any other applicable law, regulation, order, decree or directive having the force of law and relating to bribery or corruption (collectively, the “Anti-Corruption Laws”).

(ff) The operations of the Company and each of its subsidiaries are and have been conducted at all times in material compliance with all applicable anti-money laundering laws, rules, and regulations, including the financial recordkeeping and reporting requirements contained therein, and including the Bank Secrecy Act of 1970, applicable provisions of the USA PATRIOT Act of 2001, the Money Laundering Control Act of 1986, and the Anti-Money Laundering Act of 2020, (collectively, the “Anti-Money Laundering Laws”).

(gg) (i) None of the Company, any of its subsidiaries, or, to the Company’s knowledge, any director, officer, employee, agent, affiliate, or representative of the Company or any of its subsidiaries is an individual or entity (“Person”) that is, or is owned or controlled by one or more Persons that are:

(A) the subject of any sanctions administered or enforced by the United States Government (including the U.S. Department of the Treasury’s Office of Foreign Assets Control and the U.S. Department of State), the United Nations Security Council, the European Union, His Majesty’s Treasury, or any other relevant sanctions authority (collectively, “Sanctions”), or

(B) located, organized or resident in a country or territory that is the subject of comprehensive territorial Sanctions (including, without limitation, the so-called Donetsk People’s Republic, the so-called Luhansk People’s Republic, or any other Covered Region of Ukraine identified pursuant to Executive Order 14065, Crimea, Cuba, Iran, North Korea and Syria); and

(ii) The Company and each of its subsidiaries, (a) have not, since the more recent of April 24, 2019 or 10 years prior to the date of this Agreement, knowingly, engaged in, (b) are not now engaged in, and (c) will not engage in, any dealings or transactions with any Person, or in any country or territory, that at the time of the dealing or transaction is or was, or whose government is or was, the subject of Sanctions.

(hh) The Company and its subsidiaries have conducted and will conduct their businesses in compliance with the Anti-Corruption Laws, the Anti-Money Laundering Laws, and Sanctions, and no investigation, inquiry, action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Anti-Corruption Laws, the Anti-Money Laundering Laws or Sanctions is pending or, to the knowledge of the Company, threatened. The Company and its subsidiaries and affiliates have instituted and maintained and will continue to maintain policies and procedures reasonably designed to promote and achieve compliance with the Anti-Corruption Laws, the Anti-Money Laundering Laws, Sanctions, and with the representations and warranties contained herein.

(ii) The Company (i) has not, except as disclosed to the Underwriters, alone engaged in any Testing-the-Waters Communication with any person and (ii) has not authorized anyone other than the Representative to engage in Testing-the-Waters Communications. The Company reconfirms that the Representative has been authorized to act on its behalf in undertaking Testing-the-Waters Communications. The Company has not distributed any Testing-the-Waters Communication that is a written communication within the meaning of Rule 405 under the Securities Act. “Testing-the-Waters Communication” means any communication with potential investors undertaken in reliance on Section 5(d) or Rule 163B of the Securities Act.

(jj) Except as described in the Prospectus and the Time of Sale Prospectus, there are no contracts, agreements or understandings between the Company and any person that would give rise to a valid claim against the Company or any Underwriter for a brokerage commission, finder’s fee or other like payment in connection with this Offering.

(kk) Except, in each case, as would not, individually or in the aggregate, have a Material Adverse Effect, (i) the minimum funding standard under Section 302 of the Employee Retirement Income Security Act of 1974, as amended, and the regulations and published interpretations thereunder (“ERISA”), has been satisfied by each “employee benefit plan” (as defined in Section 3(3) of ERISA) with respect to which the Company or any of its Subsidiaries could have any liability (each an “Employee Benefit Plan”), and the trust forming part of each such plan which is intended to be qualified under Section 401 of the Internal Revenue Code of 1986, as amended (the “Code”), is so qualified and nothing has occurred since the date of such qualification which could reasonably be expected to result in the loss of such qualification; (ii) each of the Company and its Subsidiaries has fulfilled its obligations, if any, under Section 515 of ERISA; (iii) neither the Company nor any of its Subsidiaries maintain or are required to contribute to a “welfare plan” (as defined in Section 3(1) of ERISA) which provides retiree or other post-employment welfare benefits or insurance coverage (other than “continuation coverage” (as defined in Section 602 of ERISA)); (iv) each Employee Benefit Plan is in and has been operated in compliance with all applicable laws, including but not limited to ERISA and the Code; (v) no event has occurred (including a “reportable event” as such term is defined in Section 4043 of ERISA) and no condition exists with respect to each Employee Benefit Plan that would subject the Company or any of its Subsidiaries to any tax, fine, lien, penalty or liability imposed by ERISA or the Code; (vi) no non-exempt “prohibited transaction” as defined under Section 406 of ERISA or Section 4975 of the Code has occurred with respect to any Employee Benefit Plan; and (vii) neither the Company nor any of its Subsidiaries have incurred or would reasonably be expected to incur any liability under Title IV of ERISA.

(ll) No forward-looking statement (within the meaning of Section 27A of the Act and Section 21E of the Exchange Act) contained in the Registration Statement, the preliminary prospectus or the Prospectus has been made or reaffirmed by the Company without a reasonable basis or has been disclosed by the Company other than in good faith.

(mm) No Subsidiary of the Company is prohibited, directly or indirectly, from paying any dividends to the Company, from making any other distribution on such Subsidiary’s capital stock, from repaying to the Company any loans or advances to such Subsidiary from the Company or from transferring any of such Subsidiary’s property or assets to the Company or any other Subsidiary of the Company, except as described in or contemplated by the Registration Statement, the Time of Sale Prospectus and the preliminary prospectus or the Prospectus (exclusive of any amendment or supplement thereto).

(nn) Each contract, document or other agreement described or referred to in the Registration Statement, the preliminary prospectus and the Prospectus is in full force and effect and (assuming that such contracts and documents constitute the legal, valid and binding obligation of the other persons party thereto) is valid and enforceable by and against the parties thereto in accordance with its terms except as the enforceability thereof may be limited by (A) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and similar laws relating to or affecting creditors’ rights generally and by general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law) and (B) public policy, applicable law relating to fiduciary duties and indemnification and an implied covenant of good faith and fair dealing, and except as would not reasonably be expected to have a Material Adverse Effect. Neither the Company nor, to the knowledge of the Company, any other party is in default in the observance or performance of any material term or obligation to be performed by it under any such agreement.

(oo) To the knowledge of the Company, there are no affiliations or associations between any member of FINRA and the Company, any of the Company’s directors and executive officers or, as of the date hereof, the Company’s 10% or greater securityholders, except as described in the Registration Statement, the preliminary prospectus or the Prospectus.

(pp) The Company’s and its Subsidiaries’ information technology assets and equipment, computers, systems, networks, hardware, websites, applications, and databases (collectively, “IT Systems”) are adequate for, and operate and perform in all material respects as required in connection with the operation of the business of the Company and its Subsidiaries as currently conducted. The Company and its Subsidiaries have implemented and maintained commercially reasonable controls, procedures, and safeguards designed to maintain and protect their material confidential information, any

information that relates to individuals and/or constitutes “personal data,” “personal information,” or any similar term under applicable law (collectively, “Personal Data”), and the integrity, continuous operation, redundancy and security of the IT Systems used in connection with their businesses. To the knowledge of the Company, there have been no breaches, outages or unlawful or unauthorized use, loss, exfiltration, disclosure, destruction or access to, the same, except for those that have been remedied without material cost or liability or the duty to notify any other person, nor any incidents under internal review or investigations relating to the same. The Company and its Subsidiaries are presently in material compliance with all (i) applicable laws, statutes, judgments, orders, rules and regulations of any court or arbitrator or governmental or regulatory authority, and (ii) external-facing policies and contractual obligations, in each case, related to the privacy, security or processing of Personal Data.

2. [Reserved.]

3. Public Offering. The Company is advised by the Representative that the Underwriters propose to make a public offering of their respective portions of the Shares as soon after the Registration Statement and this Agreement have become effective as in the Representative’s judgment is advisable. The Company is further advised by the Representative that the Shares are to be offered to the public upon the terms set forth in the Prospectus. For the avoidance of doubt, there is no new issuance of Shares in the Offering. If the Notes Offering is not consummated such that the Notes Underwriting Agreement is terminated without issuance of the Notes, the Offering, this Agreement and the Capped Call Confirmations will terminate.

4. [Reserved.]

5. Conditions to the Underwriters’ Obligations. The Offering of any Shares and the several obligations of the Underwriters are subject to the following conditions:

(a) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date:

(i) no order suspending the effectiveness of the Registration Statement shall be in effect, and no proceeding for such purpose or pursuant to Section 8A under the Securities Act shall be pending before or threatened by the Commission;

(ii) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded any of the securities of the Company or any of its subsidiaries by any “nationally recognized statistical rating organization,” as such term is defined in Section 3(a)(62) of the Exchange Act; and

(iii) there shall not have occurred any change, or any development involving a prospective change, in the condition, financial or otherwise, or in the earnings, business or operations of the Company and its subsidiaries, taken as a whole, from that set forth in the Time of Sale Prospectus that, in the Representative’s judgment, is material and adverse and that makes it, in the Representative’s judgment, impracticable to market the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus.

(b) The Underwriters shall have received on the Closing Date a certificate, dated the Closing Date and signed by an executive officer of the Company, to the effect set forth in Sections 5(a)(i) and 5(a)(ii) above and to the effect that the representations and warranties of the Company contained in this Agreement are true and correct as of the Closing Date and that the Company has complied with all of the agreements and satisfied all of the conditions on its part to be performed or satisfied hereunder on or before the Closing Date.

The officer signing and delivering such certificate may rely upon the best of his or her knowledge as to proceedings threatened.

(c) The Company and other parties to the Subordination Letter Agreement shall have, on or prior to the Closing Date, executed and delivered the Subordination Letter Agreement to the Representative.

(d) The Underwriters shall have received on the Closing Date an opinion letter of ▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P., outside counsel for the Company, dated the Closing Date, in form and substance reasonably satisfactory to the Representative.

(e) The Underwriters shall have received on the Closing Date an opinion letter and a negative assurance letter of ▇▇▇▇▇▇ & ▇▇▇▇▇▇▇ LLP, counsel for the Underwriters, dated the Closing Date, in form and substance reasonably satisfactory to the Representative.

(f) All conditions to closing under the Notes Underwriting Agreement on the Closing Date shall have been satisfied and the closing of the transactions to be consummated on the Closing Date under the Notes Underwriting Agreement shall have occurred substantially concurrently with the consummation of the Offering.

(g) The Underwriters shall have received, on each of the date hereof and the Closing Date, a letter dated the date hereof or the Closing Date in form and substance reasonably satisfactory to the Underwriters, from BDO USA, P.C., independent public accountants, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Time of Sale Prospectus and the Prospectus; provided that the letter delivered on the Closing Date shall use a “cut-off date” not earlier than the date hereof.

(h) The Underwriters shall have received, on each of the date hereof and the Closing Date, a letter dated the date hereof or the Closing Date in form and substance reasonably satisfactory to the Underwriters, from BDO USA, P.C., independent public accountants, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Time of Sale Prospectus and the Prospectus covering the financial information of MER; provided that the letter delivered on the Closing Date shall use a “cut-off date” not earlier than the date hereof.

(i) The Underwriters shall have received, on each of the date hereof and the Closing Date, a certificate signed by the Chief Financial Officer of the Company, dated respectively as of the date hereof and as of the Closing Date, in form and substance reasonably satisfactory to the Representative.

(j) The “lock-up” agreements, each substantially in the form of Exhibit A hereto, between the Representative and certain executive officers and directors of the Company relating to restrictions on sales and certain other dispositions of shares of Common Stock or certain other securities, delivered to the Representative on or before the date hereof, shall be in full force and effect on the Closing Date.

(i) The Underwriters shall have received all the Shares to be sold hereunder prior to the Closing Date.

6. Covenants of the Company. The Company covenants with each Underwriter as follows:

(a) To furnish to the Representative, without charge, a signed copy of the Registration Statement (including exhibits thereto and documents incorporated by reference therein) and to deliver to each of the Underwriters during the period mentioned in Section 6(e) or 6(f) below, as many copies of the Time of Sale Prospectus, the Prospectus, any documents incorporated by reference therein and any supplements and amendments thereto or to the Registration Statement as the Representative may reasonably request.

(b) Before amending or supplementing the Registration Statement, the Time of Sale Prospectus or the Prospectus, to furnish to the Representative a copy of each such proposed amendment or supplement and not to file any such proposed amendment or supplement to which the Representative reasonably objects.

(c) To furnish to the Representative a copy of each proposed free writing prospectus to be prepared by or on behalf of, used by, or referred to by the Company and not to use or refer to any proposed free writing prospectus to which the Representative reasonably objects.

(d) Not to take any action that would result in an Underwriter or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of the Underwriter that the Underwriter otherwise would not have been required to file thereunder.

(e) If the Time of Sale Prospectus is being used to solicit offers to buy the Shares at a time when the Prospectus is not yet available to prospective purchasers and any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Time of Sale Prospectus in order to make the statements therein, in the light of the circumstances, not misleading, or if any event shall occur or condition exist as a result of which the Time of Sale Prospectus conflicts with the information contained in the Registration Statement then on file, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Time of Sale Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to any dealer upon request, either amendments or supplements to the Time of Sale Prospectus so that the statements in the Time of Sale Prospectus as so amended or supplemented will not, in the light of the circumstances when the Time of Sale Prospectus is delivered to a prospective purchaser, be misleading or so that the Time of Sale Prospectus, as amended or supplemented, will no longer conflict with the Registration Statement, or so that the Time of Sale Prospectus, as amended or supplemented, will comply with applicable law.

(f) If, during such period after the first date of the public offering of the Shares as in the opinion of counsel for the Underwriters the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is required by law to be delivered in connection with sales by an Underwriter or dealer, any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, not misleading, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to the dealers (whose names and addresses the Representative will furnish to the Company) to which Shares may have been sold by the Representative on behalf of the Underwriters and to any other dealers upon request, either amendments or supplements to the Prospectus so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, be misleading or so that the Prospectus, as amended or supplemented, will comply with applicable law.

(g) To endeavor to qualify the Shares for offer and sale under the securities or Blue Sky laws of such jurisdictions as the Representative shall reasonably request.

(h) To make generally available to the Company’s security holders and to the Representative as soon as practicable an earnings statement covering a period of at least twelve months beginning with the first fiscal quarter of the Company occurring after the date of this Agreement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations of the Commission thereunder.

(i) Whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, to pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including: (i) the fees, disbursements and expenses of the Company’s counsel and the Company’s accountants in connection with the registration of the Offering under the Securities Act and all other fees or expenses in connection with the preparation and filing of the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, any free writing prospectus prepared by or on behalf of, used by, or referred to by the Company and amendments and supplements to any of the foregoing, including the filing fees payable to the Commission relating to the Shares (within the time required by Rule 456 (b)(1), if applicable), all printing costs associated therewith, and the mailing and delivering of copies thereof to the Underwriters and dealers, in the quantities hereinabove specified, (ii) [reserved], (iii) the cost of printing or producing any Blue Sky or legal investment memorandum in connection with the offer and sale of the Shares under state securities laws and all expenses in connection with the qualification of the Shares for offer and sale under state securities laws as provided in Section 6(g) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky or legal investment memorandum, (iv) all filing fees and the reasonable fees and disbursements of counsel to the Underwriters incurred in connection with the review and qualification of the offering of the Shares by the Financial Industry Regulatory Authority, (v)—(vi) [reserved], (vii) the costs and charges of any transfer agent, registrar or depositary, (viii) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the Offering of the Shares, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior approval of the Company, travel and lodging expenses of the representatives and officers of the Company and any such consultants, and the cost of any aircraft chartered in connection with the road show, (ix) the document production charges and expenses associated with printing this Agreement and (x) all other costs and expenses incident to the performance of the obligations of the Company hereunder for which provision is not otherwise made in this Section. It is understood, however, that except as provided in this Section, Section 8 entitled “Indemnity and Contribution” and the last paragraph of Section 10 below, the Underwriters will pay all of their costs and expenses, including fees and disbursements of their counsel, stock transfer taxes payable on resale of any of the Shares by them and any advertising expenses connected with any offers they may make.

(j) If the third anniversary of the initial effective date of the Registration Statement occurs before all the Shares have been sold by the Underwriters, prior to the third anniversary to file a new shelf registration statement and to take any other action necessary to permit the public offering of the Shares to continue without interruption; references herein to the Registration Statement shall include the new registration statement declared effective by the Commission.

(k) If requested by the Representative, to prepare a final term sheet relating to the Offering of the Shares, containing only information that describes the final terms of the Offering in a form consented to by the Representative, and to file such final term sheet within the period required by Rule 433(d)(5)(ii) under the Securities Act following the date the final terms have been established for the Offering of the Shares.

(l) If at any time following the distribution of any Testing-the-Waters Communication that is a written communication within the meaning of Rule 405 under the Securities Act there occurred or occurs an event or development as a result of which such Testing-the-Waters Communication included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances existing at that subsequent time, not misleading, the Company will promptly notify the Representative and will promptly amend or supplement, at its own expense, such Testing-the-Waters Communication to eliminate or correct such untrue statement or omission.

(m) The Company will not knowingly take any action prohibited by Regulation M under the Exchange Act in connection with the Offering.

The Company will deliver to each Underwriter (or its agent), on the date of execution of this Agreement, a properly completed and executed Certification Regarding Beneficial Owners of Legal Entity Customers, together with copies of identifying documentation, and the Company undertakes to provide such additional supporting documentation as each Underwriter may reasonably request in connection with the verification of the foregoing Certification.

The Company also covenants with each Underwriter that, without the prior written consent of the Representative identified in Schedule I with the authorization to release this lock-up on behalf of the Underwriters, it will not, and will not publicly disclose an intention to, during the restricted period set forth in Schedule I hereto (the “Restricted Period”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise or (3) file any registration statement with the Commission relating to the offering of any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock. The restrictions contained in the foregoing sentence shall not apply to (A) the Shares to be sold hereunder, (B) the issuance by the Company of shares of Common Stock upon the exercise of an option or warrant or the conversion of a security outstanding on the date hereof as described in each of the Time of Sale Prospectus and Prospectus, or (C) facilitating the establishment of a trading plan on behalf of a shareholder, officer or director of the Company pursuant to Rule 10b5-1 under the Exchange Act for the transfer of shares of Common Stock, provided that (i) such plan does not provide for the transfer of Common Stock during the Restricted Period and (ii) to the extent a public announcement or filing under the Exchange Act, if any, is required of or voluntarily made by the Company regarding the establishment of such plan, such announcement or filing shall include a statement to the effect that no transfer of Common Stock may be made under such plan during the Restricted Period.

The restrictions contained in the preceding paragraph shall not apply to (A) the issuance of the Notes or the shares of Common Stock to be issued upon conversion thereof, (B) the issuance by the Company of shares of Common Stock upon the exercise of an option or other share based right or warrant or the conversion of a security outstanding on the date hereof of which the Underwriters has been advised in writing, or (C) the establishment of a trading plan pursuant to Rule 10b5 1 under the Exchange Act for the transfer of shares, provided that (i) such plan does not provide for the transfer of shares of Common Stock during the Restricted Period and (ii) to the extent a public announcement or filing under the Exchange Act, if any, is required of or voluntarily made by the Company regarding the establishment of such plan, such announcement or filing shall include a statement to the effect that no transfer of shares may be made under such plan during the Restricted Period.

7. Covenants of the Underwriters. Each Underwriter, severally and not jointly, covenants with the Company not to take any action that would result in the Company being required to file with the Commission under Rule 433(d) a free writing prospectus prepared by or on behalf of such Underwriter that otherwise would not be required to be filed by the Company thereunder, but for the action of the Underwriter.

8. Indemnity and Contribution. (a) The Company agrees to indemnify and hold harmless each Underwriter, each person, if any, who controls any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act and each affiliate of any Underwriter within the meaning of Rule 405 under the Securities Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) that arise out of, or are based upon, any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus or any amendment or supplement thereto, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, any “road show” as defined in Rule 433(h) under the Securities Act (a “road show”), the Prospectus or any amendment or supplement thereto, or any Testing-the-Waters Communication, or arise out of, or are based upon, any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such losses, claims, damages or liabilities arise out of, or are based upon, any such untrue statement or omission or alleged untrue statement or omission made in reliance upon and in conformity with any information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representative expressly for use therein, it being understood and agreed that the only such information furnished by the Underwriters through the Representative consists of the information described as such in paragraph (b) below. The Company agrees and confirms that references to “affiliates” of the Representative that appear in this Agreement shall be understood to include Mitsubishi UFJ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ Securities Co., Ltd.

(b) Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, its directors, its officers who sign the Registration Statement and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act to the same extent as the foregoing indemnity from the Company to such Underwriter, but only with reference to information relating to such Underwriter furnished to the Company in writing by such Underwriter through the Representative expressly for use in the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus, road show, or the Prospectus or any amendment or supplement thereto.

(c) In case any proceeding (including any governmental investigation) shall be instituted involving any person in respect of which indemnity may be sought pursuant to Section 8(a) or 8(b), such person (the “indemnified party”) shall promptly notify the person against whom such indemnity may be sought (the “indemnifying party”) in writing and the indemnifying party, upon request of the indemnified party, shall retain counsel reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in respect of the legal expenses of any indemnified party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all such indemnified parties and that all such fees and expenses shall be reimbursed as they are incurred. Such firm shall be designated in writing by the Representative authorized to appoint counsel under this Section set forth in Schedule I hereto, in the case of parties indemnified pursuant to Section 8(a), and by the Company, in the case of parties indemnified pursuant to Section 8(b). The indemnifying party shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party, unless such settlement includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding.

(d) To the extent the indemnification provided for in Section 8(a) or 8(b) is unavailable to an indemnified party or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each indemnifying party under such paragraph, in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other hand from the Offering of the Shares or (ii) if the allocation provided by clause 8(d)(i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 8(d)(i) above but also the relative fault of the Company on the one hand and of the Underwriters on the other hand in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative fault of the Company on the one hand and the Underwriters on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Underwriters’ respective obligations to contribute pursuant to this Section 8 are several in proportion to the respective number of Shares they have purchased hereunder, and not joint.

(e) The Company and the Underwriters agree that it would not be just or equitable if contribution pursuant to this Section 8 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in Section 8(d). The amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in Section 8(d) shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section 8 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

(f) The indemnity and contribution provisions contained in this Section 8 and the representations, warranties and other statements of the Company contained in this Agreement shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Underwriter, any person controlling any Underwriter or any affiliate of any Underwriter or by or on behalf of the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Shares.

9. Termination. The Underwriters may terminate this Agreement by notice given by the Representative to the Company, if after the execution and delivery of this Agreement and prior to or on the Closing Date, (i) trading generally shall have been suspended or materially limited on, or by, as the case may be, either of the New York Stock Exchange or the NASDAQ Stock Market (ii) trading of any securities of the Company shall have been suspended on any exchange or in any over-the-counter market, (iii) a material disruption in securities settlement, payment or clearance services in the United States shall have occurred, (iv) any moratorium on commercial banking activities shall have been declared by Federal or New York State authorities or (v) there shall have occurred any outbreak or escalation of hostilities, or any change in financial markets or any calamity or crisis that, in the Representative’s judgment, is material and adverse and which, singly or together with any other event specified in this clause (v), makes it, in the Representative’s judgment, impracticable or inadvisable to proceed with the offer, sale or delivery of the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus or the Prospectus.

10. Effectiveness; Defaulting Underwriters. This Agreement shall become effective upon the execution and delivery hereof by the parties hereto.

If, on the Closing Date, any one or more of the Underwriters shall fail or refuse to purchase Shares that it has or they have agreed to purchase hereunder on such date, and the aggregate number of Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate number of the Shares to be purchased on such date, the other Underwriters shall be obligated severally in the proportions that the number of Shares set forth opposite their respective names in Schedule II bears to the aggregate number of Shares set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as the Representative may specify, to purchase the Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date; provided that in no event shall the number of Shares that any Underwriter has agreed to purchase pursuant to this Agreement be increased pursuant to this Section 10 by an amount in excess of one-ninth of such number of Shares without the written consent of such Underwriter. If, on the Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Shares and the aggregate number of Shares with respect to which such default occurs is more than one-tenth of the aggregate number of Shares to be purchased on such date, and arrangements satisfactory to the Representative and the Company for the purchase of such Shares are not made within 36 hours after such default, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter or the Company. In any such case either the Representative or the Company shall have the right to postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement, in the Time of Sale Prospectus, in the Prospectus or in any other documents or arrangements may be effected. Any action taken under this paragraph shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

If this Agreement shall be terminated by the Underwriters, or any of them, because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement, other than solely because of the termination of this Agreement pursuant to Section 10 or the occurrence of any event specified in clause (i), (iii), (iv) or (v) of Section 9 above, the Company will reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and disbursements of their counsel) reasonably incurred by such Underwriters in connection with this Agreement or the Offering contemplated hereunder.

11. Entire Agreement. (a) This Agreement, together with any contemporaneous written agreements and any prior written agreements (to the extent not superseded by this Agreement) that relate to the Offering of the Shares, represents the entire agreement between the Company and the Underwriters with respect to the preparation of any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, the conduct of the Offering, and the purchase and sale of the Shares.

(b) The Company acknowledges that in connection with the Offering of the Shares: (i) the Underwriters have acted at arm’s length, are not agents of, and owe no fiduciary duties to, the Company or any other person, (ii) the Underwriters owe the Company only those duties and obligations set forth in this Agreement, any contemporaneous written agreements and prior written agreements (to the extent not superseded by this Agreement), if any, (iii) the Underwriters may have interests that differ from those of the Company, and (iv) none of the activities of the Underwriters in connection with the transactions contemplated herein constitutes a recommendation, investment advice, or solicitation of any action by the Underwriters with respect to any entity or natural person. The Company waives to the full extent permitted by applicable law any claims it may have against the Underwriters arising from an alleged breach of fiduciary duty in connection with the Offering of the Shares.

12. Recognition of the U.S. Special Resolution Regimes. (a) In the event that any Underwriter that is a Covered Entity becomes subject to a proceeding under a U.S. Special Resolution Regime, the transfer from such Underwriter of this Agreement, and any interest and obligation in or under this Agreement, will be effective to the same extent as the transfer would be effective under the U.S. Special Resolution Regime if this Agreement, and any such interest and obligation, were governed by the laws of the United States or a state of the United States.

(b) In the event that any Underwriter that is a Covered Entity or a BHC Act Affiliate of such Underwriter becomes subject to a proceeding under a U.S. Special Resolution Regime, Default Rights under this Agreement that may be exercised against such Underwriter are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S. Special Resolution Regime if this Agreement were governed by the laws of the United States or a state of the United States.

For purposes of this Section a “BHC Act Affiliate” has the meaning assigned to the term “affiliate” in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k). “Covered Entity” means any of the following: (i) a “covered entity” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 252.82(b); (ii) a “covered bank” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 47.3(b); or (iii) a “covered FSI” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 382.2(b). “Default Right” has the meaning assigned to that term in, and shall be interpreted in accordance with, 12 C.F.R. §§ 252.81, 47.2 or 382.1, as applicable. “U.S. Special Resolution Regime” means each of (i) the Federal Deposit Insurance Act and the regulations promulgated thereunder and (ii) Title II of the ▇▇▇▇-▇▇▇▇▇ ▇▇▇▇ Street Reform and Consumer Protection Act and the regulations promulgated thereunder.

13. Counterparts. This Agreement may be signed in two or more counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

14. Applicable Law. This Agreement shall be governed by and construed in accordance with the internal laws of the State of New York.

15. Headings. The headings of the sections of this Agreement have been inserted for convenience of reference only and shall not be deemed a part of this Agreement.

16. Notices. All communications hereunder shall be in writing and effective only upon receipt and if to the Underwriters shall be delivered, mailed or sent to the Representative at the address set forth in Schedule I hereto; and if to the Company shall be delivered, mailed or sent to the address set forth in Schedule I hereto.


Very truly yours, Solaris Energy Infrastructure, Inc.

By:		/s/ ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇▇▇▇
		Name: ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇▇▇▇
		Title: President and Chief Financial Officer


Accepted as of the date hereof ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC Acting on behalf of itself and the several Underwriters named in Schedule II hereto.

By:		▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC

By:		/s/ ▇▇▇ ▇’▇▇▇▇▇▇
		Name: ▇▇▇ ▇’▇▇▇▇▇▇
		Title: Executive Director

[Signature Page to Underwriting Agreement]

SCHEDULE I


Representative: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC
Representative authorized to release lock-up under Section 6: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC
Representative authorized to appoint counsel under Section 8(c): ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC

Registration Statement File No.:		333-290735

Time of Sale Prospectus		1. Prospectus dated October 6, 2025 relating to the Shares 2. The preliminary prospectus supplement dated October 6, 2025 relating to the Shares 3. The free writing prospectus dated October 6, 2025

Lock-up Restricted Period:		60 days

Title of Shares to be purchased:		Class A common stock, par value $0.01 per share

Number of Shares:		1,800,000

Initial Public Offering Price		$44.00 a share

Closing Date and Time:		October 8, 2025 10:00 a.m.

Closing Location:		▇▇▇▇▇▇ & ▇▇▇▇▇▇ L.L.P. ▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇

Address for Notices to Underwriters:		▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC ▇▇▇▇ ▇▇▇▇▇▇▇▇, ▇▇^▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇

Address for Notices to the Company:		Solaris Energy Infrastructure, Inc. ▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇

I-1

SCHEDULE II


Underwriter	Number of Shares To Be Purchased
▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC		1,800,000

Total:		1,800,000

II-1

SCHEDULE III

Jurisdictions


Entity		Jurisdiction

Solaris Energy Infrastructure, Inc.		Delaware

III-1

SCHEDULE IV

Subsidiaries


Entity		Jurisdiction
Solaris Energy Infrastructure, LLC		Delaware
Solaris Oilfield Site Services Operating, LLC		Texas
Solaris Oilfield Early Property, LLC		Texas
Solaris Oilfield Site Services Personnel LLC		Delaware
Solaris Logistics, LLC		Delaware
Solaris Oilfield Technologies, LLC		Delaware
Solaris Oilfield Transportation, LLC		Delaware
Solaris Power Solutions, LLC		Texas
Solaris Power Solutions Stateline, LLC		Delaware
Solaris Power Solutions Stateline Operating, LLC		Delaware
Stateline Power, LLC		Texas
HVMVLV, LLC		Texas

IV-1

EXHIBIT A

[FORM OF LOCK-UP AGREEMENT]

October 6, 2025

▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC

c/o Morgan ▇▇▇▇▇▇▇ & Co. LLC

▇▇▇▇ ▇▇▇▇▇▇▇▇

New York, NY 10036

As Representative of the several Underwriters

named in Schedule I of the Underwriting Agreement

Ladies and Gentlemen:

As an inducement to the Underwriters to execute the Underwriting Agreement (the “Underwriting Agreement”), pursuant to which an offering will be made of Class A common stock, par value $0.01 per share (the “Securities”), of Solaris Energy Infrastructure, Inc., and any successor (by merger or otherwise) thereto, (the “Company”), the undersigned hereby agrees that during the period specified in the following paragraph (the “Restricted Period”), the undersigned will not offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, any shares of class A common stock, $0.01 par value (the “Class A Common Stock”) or class B common stock, $0.00 par value (the “Class B Common Stock” and, together with the Class A Common Stock, the “Common Stock”) beneficially owned (as such term is used in Rule 13d-3 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) or securities convertible into or exchangeable or exercisable for any Securities, enter into a transaction which would have the same effect, or enter into any swap, hedge or other arrangement that transfers, in whole or in part, any of the economic consequences of ownership of the Securities, whether any such aforementioned transaction is to be settled by delivery of the Securities or such other securities, in cash or otherwise, or publicly disclose the intention to make any such offer, sale, pledge or disposition, or to enter into any such transaction, swap, hedge or other arrangement, without, in each case, the prior written consent of ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC (the “Representative”). In addition, the undersigned agrees that, without the prior written consent of the Representative, it will not, during the Restricted Period, make any demand for or exercise any right with respect to, the registration of any Securities or any security convertible into or exercisable or exchangeable for the Securities . Notwithstanding the foregoing, nothing shall prohibit the filing of a demand registration statement by the Company pursuant to the demand rights under the Registration Rights Agreement, dated May 17, 2017, by and between the Company and the signatories thereto; provided that no Securities shall be sold or transferred during the Restricted Period.

The Restricted Period will commence on the date of this Restricted Agreement and continue and include the date 60 days after the public offering date set forth on the final prospectus used to sell the Securities (the “Public Offering Date”) pursuant to the Underwriting Agreement.

Any Securities received upon exercise of options or other securities of the Company granted to the undersigned and any Securities acquired by the undersigned in the open market will also be subject to this Lock-Up Agreement. Additionally, the restrictions in this Lock-Up Agreement shall not apply to (a) any transactions relating to Securities acquired in the open market after the closing of the Offering, provided that with respect to any sale or other disposition of such Securities, no filing under the Exchange Act (other than on Form 5) or other public announcement shall be required or shall be voluntarily made by any party in connection with subsequent sales of such Securities acquired in such open market transactions during the Restricted Period, (b) any exercise of options or vesting or exercise of any other equity-based award, in each case, outstanding on the Public Offering Date, and in each case under the Company’s equity incentive plan or any other plan or agreement described in the prospectus included in the Registration Statement, provided that any Securities received upon such exercise or vesting will also be subject to this Restricted Agreement, (c) transfers as a bona fide gift or gifts, (d) transfers to a family member, trust, family limited partnership or family limited liability company for the direct or indirect benefit of the undersigned or his or her family members, (e) transfers by testate or intestate succession, provided that in each transfer pursuant to clauses (c) through (e) the transferee agrees to be bound in writing by the terms of this Lock-Up Agreement prior to such transfer, such transfer shall not involve a disposition for value and no filing or public announcement by any party (donor, donee, transferor or transferee) under the Exchange Act or otherwise shall be required or shall be voluntarily made in connection with such transfer (other than a filing on a Form 5), or (f) the establishment of any written contract, instruction or plan that satisfies all of the requirements of Rule 10b5-1 (a “Rule 10b5-1 Plan”) under the Exchange Act; provided, however, that no sales of Securities or securities convertible into, or exchangeable or exercisable for, Securities, shall be made pursuant to a Rule 10b5-1 Plan prior to the expiration of the Restricted Period (as the same may be extended pursuant to the provisions hereof); and provided further, that no party is required to publicly announce, file, or report the establishment of such Rule 10b5-1 Plan in any public report, announcement, or filing with the Commission under the Exchange Act during the Restricted Period and does not otherwise voluntarily effect any such public report, announcement, or filing regarding such Rule 10b5-1 Plan.

In furtherance of the foregoing, the Company and its transfer agent and registrar are hereby authorized to decline to make any transfer of shares of Securities if such transfer would constitute a violation or breach of this Lock-Up Agreement.

If the undersigned is an officer or director of the Company, the Representative agrees that, at least three business days before the effective date of any release or waiver of the foregoing restrictions in connection with a transfer of Securities, the Representative will notify the Company of the impending release or waiver. The provisions of this paragraph will not apply if (a) the release or waiver is effected solely to permit a transfer not for consideration and (b) the transferee has agreed in writing to be bound by the same terms described in this Lock-Up Agreement to the extent and for the duration that such terms remain in effect at the time of the transfer.

The undersigned acknowledges and agrees that the Underwriters have not provided any recommendation or investment advice nor have the Underwriters solicited any action from the undersigned with respect to the Offering of the Securities and the undersigned has consulted their own legal, accounting, financial, regulatory and tax advisors to the extent deemed appropriate. The undersigned further acknowledges and agrees that, although the Underwriters may provide certain Regulation Best Interest and Form CRS disclosures or other related documentation to you in connection with the Offering, the Underwriters are not making a recommendation to you to participate in the Offering or sell any Securities at the price determined in the Offering, and nothing set forth in such disclosures or documentation is intended to suggest that any Underwriter is making such a recommendation.

This Lock-Up Agreement shall be binding on the undersigned and the successors, heirs, personal representatives and assigns of the undersigned.

Whether or not the Offering actually occurs depends on a number of factors, including market conditions. Any offering will only be made pursuant to an Underwriting Agreement, the terms of which are subject to negotiation between the Company and the Underwriters. It is understood that if the Underwriting Agreement is executed yet terminates (other than the provisions thereof that survive termination) prior to payment for and delivery of the Securities, the undersigned shall be released from all obligations under this Lock-Up Agreement.

This Agreement may be executed and delivered by facsimile, by email in portable document format (.pdf), or any electronic signature complying with the U.S. federal ESIGN Act of 2000 (e.g., DocuSign) and delivery of the signature page by such method will be deemed to have the same effect as if the original signature had been delivered to the other parties.

[Signature Page Follows]

Very truly yours,

(Name)

(Address)

Solaris Energy Infrastructure, Inc. Class A common stock, par value $0.01 per share UNDERWRITING AGREEMENT

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