Sec Form 3 Filing - J Turbines, Inc. @ Solaris Energy Infrastructure, Inc. - 2024-09-11

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person J Turbines, Inc. 2. Issuer Name and Ticker or Trading Symbol Solaris Energy Infrastructure, Inc. [ SEI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2929 BUFFALO SPEEDWAY, A1204 3. Date of Earliest Transaction (MM/DD/YY) 09/11/2024 (Street) HOUSTON, TX77098 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class B Common Stock ( 1 ) 8,114,783 ( 2 ) D ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Solaris Energy Infrastructure, LLC Units $ 0 ( 4 ) ( 4 ) Class A Common Stock 8 ,114,783 ( 2 ) D ( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other J Turbines, Inc. 2929 BUFFALO SPEEDWAY, A1204 HOUSTON, TX77098 X Johnson John Abraham 2929 BUFFALO SPEEDWAY, A1204 HOUSTON, TX77098 X Signatures J Turbines, Inc. By: /s/ Christopher M. Powell, Attorney-in-Fact 09/13/2024 Signature of Reporting Person Date /s/ Christopher M. Powell, Attorney-in-Fact 09/13/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each share of Class B common stock, par value $0.00 per share ("Class B common stock") of Solaris Energy Infrastructure, Inc., a Delaware corporation (f/k/a Solaris Oilfield Infrastructure, Inc.) (the "Issuer"), has no economic rights but entitles the holder to one vote on all matters to be voted on by the stockholders generally. ( 2 )Includes securities received in connection with transactions contemplated by the Contribution Agreement, dated July 9, 2024, by and among the Issuer, Solaris Energy Infrastructure, LLC (f/k/a Solaris Oilfield Infrastructure, LLC) ("Solaris LLC"), a Delaware limited liability company and a subsidiary of the Issuer, John A. Johnson, John Tuma, J Turbines, Inc. ("J Turbines"), a Delaware corporation, and KTR Management Company, LLC ("KTR"), a Texas limited liability company. On September 11, 2024, J Turbines and KTR each received, among other things, 8,114,783 shares of Class B common stock, together with a corresponding number of units in Solaris LLC ("Solaris LLC Units") in exchange for all of the issued and outstanding equity interests of Mobile Energy Rentals LLC, a Texas limited liability company, as more fully described in the Schedule 13D filed by J Turbines on September 13, 2024. ( 3 )Represents securities held directly by J Turbines. John A. Johnson owns all of the issued and outstanding equity interests of J Turbines and has the sole authority to vote or dispose of the shares held by J Turbines in his sole discretion. Mr. Johnson may therefore be deemed to beneficially own the securities of the Issuer held directly by J Turbines. ( 4 )Subject to the terms of the Second Amended and Restated Limited Liability Company Agreement of Solaris LLC, dated as of May 11, 2017, as amended from time to time, included as Exhibit 10.1 to the Issuer's Current Report on Form 8-K filed May 17, 2017, the Solaris LLC Units (together with a corresponding number of shares of Class B common stock) are exchangeable from time to time for shares of Class A common stock, par value $0.01 per share, of the Issuer.

Remarks: See attached for Exhibit 24.1 - Power of Attorney.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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