SCHEDULE 13G/A 0001172661-25-002314 0001638555 XXXXXXXX LIVE 3 Class A Common Stock, $0.01 par value 09/30/2025 0001697500 SOLARIS ENERGY INFRASTRUCTURE, INC. 83418M103 9651 Katy Freeway Suite 300 Houston TX 77024 Rule 13d-1(c) Summit Partners Public Asset Management, LLC DE 0.00 1672595.00 0.00 1796310.00 1796310.00 N 4.03 IA Summit Partners, L.P. DE 0.00 1672595.00 0.00 1672595.00 1672595.00 N 3.75 PN Summit Partners Concentrated Growth L/S Master Fund, L.P. E9 0.00 127585.00 0.00 127585.00 127585.00 N 0.29 PN Summit Partners Technology L/S Master Fund, L.P. E9 0.00 118271.00 0.00 118271.00 118271.00 N 0.27 PN Summit Partners Sustainable Opportunities L/S Fund Limited E9 0.00 569560.00 0.00 569560.00 569560.00 N 1.28 PN Summit Partners Sustainable Opportunities L/S QP Fund, L.P. DE 0.00 835321.00 0.00 835321.00 835321.00 N 1.87 PN Summit Partners Sustainable Opportunities L/S Fund, L.P. DE 0.00 21858.00 0.00 21858.00 21858.00 N .05 PN Summit Partners Alydar GP, L.P. DE 0.00 1103035.00 0.00 1103035.00 1103035.00 N 2.47 PN Summit Partners Alydar GP, LLC DE 0.00 1103035.00 0.00 1103035.00 1103035.00 N 2.47 CO Philip Furse X1 0.00 1672595.00 0.00 1796310.00 1796310.00 N 4.03 IN Timothy Albright X1 0.00 1672595.00 0.00 1796310.00 1796310.00 N 4.03 IN Robert MacAulay X1 0.00 1672595.00 0.00 1796310.00 1796310.00 N 4.03 IN Matthew Curtis X1 0.00 1672595.00 0.00 1796310.00 1796310.00 N 4.03 IN SOLARIS ENERGY INFRASTRUCTURE, INC. 9651 Katy Freeway, Suite 300, Houston, Texas 77024 The names of the persons filing this report (each a "Reporting Person" and collectively, the "Reporting Persons") are: (i) Summit Partners Public Asset Management, LLC ("SPPAM"), (ii) Summit Partners, L.P. ("SP"), (iii) Summit Partners Concentrated Growth L/S Master Fund, L.P. ("Summit Concentrated Growth"), (iv) Summit Partners Technology L/S Master Fund, L.P. ("Summit Technology"), (v) Summit Partners Sustainable Opportunities L/S Fund Limited ("SPSO Limited"), (vi) Summit Partners Sustainable Opportunities L/S QP Fund, L.P. ("SPSO QP"), (vii) Summit Partners Sustainable Opportunities L/S Fund, L.P. ("SPSO LP"), (viii) Summit Partners Alydar GP, L.P. ("Fund GP"), (ix) Summit Partners Alydar GP, LLC ("GP"), (x) Philip Furse, (xi) Timothy Albright, (xii) Robert MacAulay and (xiii) Matthew Curtis. The Reporting Persons have entered into a Joint Filing Agreement, dated November 14, 2025, a copy of which is incorporated by reference as Exhibit A to this statement, pursuant to which the Reporting Persons agreed to file this Schedule 13G and any amendments hereto jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act. The address of the principal business office or registered office, as applicable, of SPPAM, SP, SPSO QP, SPSO LP, Fund GP, GP, Philip Furse, Timothy Albright, Robert MacAulay and Matthew Curtis is 222 Berkeley Street, 18th Floor, Boston, MA 02116. The registered office address of Summit Concentrated Growth, Summit Technology and SPSO Limited is c/o Walkers Corporate Limited, 190 Elgin Avenue, George Town, Grand Cayman KY1-9008, Cayman Islands. See responses to Item 4 on each cover page. Y 1796310 4.03% 0 1672595 0 1796310 N Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. The information required by this item with respect to each Reporting Person is set forth in Rows 5 through 9 and 11 of each cover page to this Schedule 13G. The ownership percentages are calculated based on 44,603,740 outstanding shares of Common Stock, as of June 30, 2025, as reported in Issuer's 10-Q filed on August 1, 2025. SPPAM is the investment manager with respect to shares of Common Stock directly held by Summit Concentrated Growth, SPSO QP, SPSO LP, SPSO Limited and Summit Technology (collectively the "Funds") and a separately managed account. SP is the Managing Member of SPPAM. Summit Concentrated Growth, SPSO Limited, SPSO QP,SPSO LP and Summit Technology each directly holds shares of Common Stock. Fund GP is the general partner of Summit Concentrated Growth, SPSO QP, SPSO LP and Summit Technology. GP is the general partner of Fund GP. Philip Furse is the Chief Investment Officer of SPPAM and a Portfolio Manager of SPPAM, with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Timothy Albright is a Portfolio Manager of SPPAM with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Robert MacAulay is the Chief Risk Officer of SPPAM with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Matthew Curtis is a Portfolio Manager of SPPAM with respect to the shares of Common Stock directly held by the Funds and the separately managed account of SPPAM. Accordingly, each of the Reporting Persons may be deemed the beneficial owner of the reported securities but the filing of this statement shall not be construed as an admission that any of the Reporting Persons is, for the purpose of 13(d) or 13(g) of the Act, the beneficial owner of any securities covered by this statement. Please note that the Reporting Persons do not have any voting control over any of the securities held by the separately managed account referenced herein. JOINT FILING AGREEMENT This will confirm the agreement by and among the undersigned that the Schedule 13G filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the Class A Common Stock, $0.01 par value, of Solaris Energy Infrastructure, Inc. (this "Agreement"), is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below that is named as a reporting person in such filing in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Joint Filing Agreement dated November 14, 2025, among Summit Partners Public Asset Management, LLC, Summit Partners, L.P., Summit Partners Concentrated Growth L/S Master Fund, L.P., Summit Partners Technology L/S Master Fund, L.P., Summit Partners Sustainable Opportunities L/S Fund Limited, Summit Partners Sustainable Opportunities L/S QP Fund, L.P., Summit Partners Sustainable Opportunities L/S Fund, L.P., Summit Partners Alydar GP, L.P., Summit Partners Alydar GP, LLC, Philip Furse, Timothy Albright, Robert MacAulay and Matthew Curtis. Dated: November 14, 2025 Summit Partners Public Asset Management, LLC Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Concentrated Growth LIS Master Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Technology LIS Master Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennesse Summit Partners Sustainable Opportunities LIS Fund Limited Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Sustainable Opportunities LIS QP Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Sustainable Opportunities LIS Fund, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Alydar GP, L.P. Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Summit Partners Alydar GP, LLC Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, Authorized Person Philip Furse Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Philip Furse Timothy Albright Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Timothy Albright Robert MacAulay Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Robert MacAulay Matthew Curtis Signature: Adam H. Hennessey Name/Title: Adam H. Hennessey, POA for Matthew Curtis EXHIBIT B POWERS OF ATTORNEY Powers of Attorney, dated as of January 31, 2024, (incorporated herein by reference to Exhibit B to that certain Schedule 13G filed on January 31, 2024, with the Securities and Exchange Commission in connection with securities of Klaviyo, Inc.) Summit Partners Public Asset Management, LLC Adam H. Hennessey 11/14/2025 Summit Partners, L.P. Adam H. Hennessey 11/14/2025 Summit Partners Concentrated Growth L/S Master Fund, L.P. Adam H. Hennessey 11/14/2025 Summit Partners Technology L/S Master Fund, L.P. Adam H. Hennessey 11/14/2025 Summit Partners Sustainable Opportunities L/S Fund Limited Adam H. Hennessey 11/14/2025 Summit Partners Sustainable Opportunities L/S QP Fund, L.P. Adam H. Hennessey 11/14/2025 Summit Partners Sustainable Opportunities L/S Fund, L.P. Adam H. Hennessey 11/14/2025 Summit Partners Alydar GP, L.P. Adam H. Hennessey 11/14/2025 Summit Partners Alydar GP, LLC Adam H. Hennessey 11/14/2025 Philip Furse Adam H. Hennessey 11/14/2025 Timothy Albright Adam H. Hennessey 11/14/2025 Robert MacAulay Adam H. Hennessey 11/14/2025 Matthew Curtis Adam H. Hennessey 11/14/2025