Solaris Energy Infrastructure, Inc.

We are reporting the following information in lieu of reporting on a Current Report on Form 8-K under Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Chief Accounting Officer Transition

On November 4, 2026, the board of directors of the Company (the “Board”) appointed Jacob P. Gobar as Chief Accounting Officer of the Company, effective November 12, 2026 (the “Effective Date”). Effective as of the Effective Date, Mr. Gobar will serve as the Company’s principal accounting officer.

Mr. Gobar, age 45, has served as the Chief Accounting Officer of WildFire Energy I LLC, a privately held independent energy company focused on the acquisition, exploitation, and production of oil and natural gas properties in the United States, since March 2021, and will continue in that role until November 10, 2026. From January 2019 until February 2021, Mr. Gobar served as Vice President and Chief Accounting Officer of Concho Resources Inc. (formerly NYSE: CXO), an independent exploration and production company engaged in the acquisition, development and exploration of oil and natural gas properties in the Permian Basin of Southeast New Mexico and West Texas, through its acquisition by ConocoPhillips Company. From December 2016 through January 2019, Mr. Gobar held various positions of increasing responsibility within the accounting function at Concho Resources. Mr. Gobar also previously held accounting leadership positions with Memorial Resource Development Corp., VAALCO Energy, Inc. and Sunoco Logistics, and began his career in the assurance practice of PricewaterhouseCoopers. Mr. Gobar holds a Master of Accountancy degree and a Bachelor of Business Administration degree in Accounting from Texas State University and is a licensed certified public accountant in the State of Texas.

In connection with his appointment, (a) Mr. Gobar will receive an annual base salary of $350,000, (b) he will be eligible for an annual discretionary cash bonus with a target amount of up to 75% of his annual base salary, (c) he will be eligible to participate in the Solaris Oilfield Infrastructure, Inc. Long Term Incentive Plan, as amended (the “LTIP”), with a target annual award of up to 75% of his annual base salary, and (d) effective as of the Effective Date, he will receive a one-time sign-on grant of restricted shares of Class A common stock under the LTIP valued at $262,500. The number of shares will be determined based on the ten-day trailing volume-weighted average price of the Class A common stock as of the last trading day immediately prior to the grant date, and the award will vest in three substantially equal annual installments beginning on November 15, 2027, subject to his continued employment through each applicable vesting date. Mr. Gobar will also be eligible to participate in the Company’s employee benefit plans, including the Solaris Energy Infrastructure, Inc. Amended and Restated Executive Change in Control Severance Plan, as amended (the “CIC Plan”). Under the CIC Plan, effective as of the Effective Date and subject to his execution of a participation agreement, he will be entitled to receive Tier 4 benefits (as described in the CIC Plan). The foregoing description of the CIC Plan is not complete and is qualified in its entirety by reference to the full text of the CIC Plan, which is attached as Exhibit 10.2 to this Quarterly Report on Form 10-Q and incorporated herein by reference.

There are no family relationships between Mr. Gobar and any director or executive officer of the Company or any person nominated or chosen by the Company to become a director or executive officer. There are no arrangements or understandings between Mr. Gobar and any other person pursuant to which Mr. Gobar was appointed as the Company’s Chief Accounting Officer. The Company is not aware of any transaction involving Mr. Gobar that would require disclosure under Item 404(a) of Regulation S-K promulgated under the Exchange Act.

Christopher P. Wirtz will step down as the Company’s Chief Accounting Officer and principal accounting officer, effective as of the Effective Date, in order to have greater flexibility to spend time with his family and attend to family health matters. Mr. Wirtz’s decision was his own and not the result of any disagreement with the Company on any matter relating to the Company’s operations, policies or practices. Following the Effective Date, Mr. Wirtz will continue as an employee of the Company and valued member of the accounting team.

Indemnification Agreement

In connection with Mr. Gobar’s appointment as Chief Accounting Officer, the Company entered into an Indemnification Agreement with Mr. Gobar, dated as of the Effective Date (the “Indemnification Agreement”). The Indemnification Agreement requires the Company to indemnify Mr. Gobar to the fullest extent permitted under Delaware law against liability that may arise by reason of his service to the Company and to advance expenses incurred as a result of any proceeding against him as to which he could be indemnified.

The foregoing description of the Indemnification Agreement is not complete and is qualified in its entirety by reference to the full text of the Indemnification Agreement, which is attached as Exhibit 10.3 to this Quarterly Report on Form 10-Q and incorporated herein by reference.

Rule 10b5-1 Trading Arrangements

During the three months ended September 30, 2026, no director or officer (as defined in Rule 16a-1(f) under the Exchange Act) of the Company adopted orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.