X0202 SCHEDULE 13G/A 0000950142-25-000396 0001505639 XXXXXXXX LIVE 8 Class A Common Stock, par value $0.01 per share 06/30/2026 0001693256 Select Water Solutions, Inc. 81617J301 1820 North I-35 Gainesville TX 76240 Rule 13d-1(d) Crestview Partners II GP, L.P. DE 0.00 8774073.00 0.00 8774073.00 8774073.00 N 6.3 PN The total in Rows (6), (8), and (9) reflects holdings as of August 13, 2026, and includes the 7,107,701 shares of Class A Common Stock, par value $0.01 per share, of the Issuer ("Class A Shares") that would be issued in connection with a full redemption of the 7,107,701 Common LLC Units ("Common Units") of SES Holdings, LLC ("SES Holdings"), a subsidiary of the Issuer, that are indirectly owned by Crestview Partners II SES Investment, LLC ("Crestview II SES") through SES Legacy Holdings, LLC ("Legacy Holdings") and deemed to be beneficially owned by the Reporting Person. The Common Units are redeemable at the election of Legacy Holdings for newly-issued Class A Shares on a one-for-one basis. The Reporting Person may also be deemed to beneficially own 7,107,701 shares of Class B Common Stock, par value $0.01 per share, of the Issuer ("Class B Shares") that are indirectly owned by Crestview II SES through Legacy Holdings. The Class B Shares would be canceled upon a full redemption of the Common Units. Excluding Class A Shares that may be issued upon a redemption of the Common Units, the total number of Class A Shares deemed to be beneficially owned by the Reporting Person is 1,666,372 and the percentage of Class A Shares represented by such amount is 1.3%. Crestview Partners II SES Investment B, LLC DE 0.00 1666372.00 0.00 1666372.00 1666372.00 N 1.3 CO The total in Rows (6), (8), and (9) reflects holdings as of August 13, 2026. Crestview Partners II SES Investment, LLC DE 0.00 7107701.00 0.00 7107701.00 7107701.00 N 5.1 CO The total in Rows (6), (8), and (9) reflects holdings as of August 13, 2026, and represents the 7,107,701 Class A Shares that would be issued in connection with a full redemption of the 7,107,701 Common Units of SES Holdings, LLC, a subsidiary of the Issuer, that are indirectly owned by the Reporting Person through Legacy Holdings. The Common Units are redeemable at the election of the Reporting Person for newly-issued Class A Shares on a one-for-one basis. The Reporting Person also indirectly owns 7,107,701 Class B Shares through Legacy Holdings. The Class B Shares would be canceled upon a full redemption of the Common Units. The Reporting Person does not directly or indirectly own any Class A Shares other than Class A Shares that may be issued upon the redemption of the Common Units and related cancellation of the Class B Shares held through Legacy Holdings. Crestview Advisors, L.L.C. DE 0.00 0.00 0.00 0.00 0.00 N 0.00 CO Select Water Solutions, Inc. 1820 North I-35, Gainesville, TX 76240 See Item 2(b). Crestview Partners II GP, L.P. c/o Crestview Partners 590 Madison Avenue, 42nd Floor New York, NY 10022 Crestview Partners II SES Investment B, LLC c/o Crestview Partners 590 Madison Avenue, 42nd Floor New York, NY 10022 Crestview Partners II SES Investment, LLC c/o Crestview Partners 590 Madison Avenue, 42nd Floor New York, NY 10022 Crestview Advisors, L.L.C. c/o Crestview Partners 590 Madison Avenue, 42nd Floor New York, NY 10022 See Row (4) of each Reporting Person's cover page. Y See Row (9) of each Reporting Person's cover page. Beneficial ownership reported in this Schedule 13G reflects holdings as of August 13, 2026. Crestview Partners II GP, L.P. is the general partner of each of (i) Crestview Partners II, L.P., Crestview Partners II (TE), L.P., (which is the general partner of Crestview Holdings II (TE), L.P.) and Crestview Partners II (FF), L.P., each of which are direct or indirect members of Crestview II SES and (ii) Crestview Offshore Holdings II (Cayman), L.P., Crestview Offshore Holdings II (FF Cayman), L.P. and Crestview Offshore Holdings II (892 Cayman), L.P., each of which is a direct member of Crestview II SES B. Crestview Advisors, L.L.C. provides investment advisory and management services to certain of the foregoing entities. Each of Crestview Partners II GP, L.P., Crestview Offshore Holdings II (Cayman), L.P., Crestview Offshore Holdings II (FF Cayman), L.P. and Crestview Offshore Holdings II (892 Cayman), L.P. may be deemed to have beneficial ownership of the 1,666,372 Class A Shares directly owned by Crestview II SES B. Each of Crestview Partners II GP, L.P., Crestview Partners II, L.P., Crestview Partners II (TE), L.P., Crestview Holdings II (TE), L.P. and Crestview Partners II (FF), L.P. may be deemed to have beneficial ownership of the 7,107,701 Class B Shares and the 7,107,701 Common Units indirectly beneficially owned by Crestview II SES through Legacy Holdings. The 7,107,701 Common Units indirectly owned by Crestview II SES through Legacy Holdings may be redeemed for Class A Shares upon the request of Crestview II SES on a one-for-one basis. The 7,107,701 Class B Shares directly owned by Crestview II SES through Legacy Holdings would be cancelled upon a full redemption of the 7,107,701 Common Units indirectly owned by Crestview II SES through Legacy Holdings for Class A Shares. Each reporting person disclaims beneficial ownership of the reported securities except and to the extent of its pecuniary interest therein. See Row (11) of each Reporting Person's cover page. The percentages reported herein are based on (i) the 128,942,892 Class A Shares outstanding as of August 3, 2026, as reported in the Issuer's Form 10-Q filed August 5, 2026 and (ii) the 9,537,941 Common Units indirectly owned by Crestview II SES through Legacy Holdings as of August 3, 2026 which may be redeemed for Class A Shares upon the request of Crestview II SES on a one-for-one basis. See Row (5) of each Reporting Person's cover page. See Row (6) of each Reporting Person's cover page. See Row (7) of each Reporting Person's cover page. See Row (8) of each Reporting Person's cover page. Y Y Y Y Y Y Exhibit 99.1: Joint Filing Agreement Crestview Partners II GP, L.P. /s/ Evelyn C. Pellicone 08/14/2026 Crestview Partners II SES Investment B, LLC /s/ Evelyn C. Pellicone 08/14/2026 Crestview Partners II SES Investment, LLC /s/ Evelyn C. Pellicone 08/14/2026 Crestview Advisors, L.L.C. /s/ Evelyn C. Pellicone 08/14/2026