X0508 4 2026-02-23 false 0001693256 Select Water Solutions, Inc. WTTR 0001539285 Schmitz John 1820 N I-35 GAINESVILLE TX 76240 true true false false President & CEO false Class A Common Stock 2026-02-23 4 G false 265250.00 0.00 D 274137.00 I By GRAT Class A Common Stock 2026-02-23 4 G false 265250.00 0.00 A 265250.00 I By Spouse Class A Common Stock 2026-02-24 4 A false 143084.00 0.00 A 1007816.00 D Class A Common Stock 2026-02-24 4 F false 66952.00 13.65 D 940864.00 D Class A Common Stock 274138.00 I By GRAT Class A Common Stock 13126.00 I By B-29 GP, LLC Class A Common Stock 249243.00 I By B-29 Investments, LP Class A Common Stock 1496626.00 I By Family Trust Class A Common Stock 31372.00 I By Family Trust for Child 1 Class A Common Stock 31373.00 I By Family Trust for Child 2 Class A Common Stock 31373.00 I By Family Trust for Child 3 Class A Common Stock 31372.00 I By Family Trust for Child 4 Class A Common Stock 31373.00 I By Family Trust for Child 5 Class A Common Stock 31373.00 I By Family Trust for Child 6 The transaction reported herein represents a gift of shares of common stock of Select Water Solutions, Inc. (the "Issuer"). This transaction was arranged prior to the commencement of the Issuer's public offering of common stock on February 19, 2026 and is being made pursuant to the lock-up agreement entered into by the Reporting Person and J.P. Morgan Securities LLC and BofA Securities, Inc., as representatives of the underwriters in connection with the offering, which permits bona fide estate planning transfers during the lock-up period. Shares are held directly by the Sandra Lee Schmitz 2024 Annuity Trust DTD November 13, 2024, of which the reporting person is the trustee. These shares of restricted stock, granted under the Select Water Solutions, Inc. 2024 Equity Incentive Plan, will vest 1/3 on February 24, 2027, 1/3 on February 24, 2028, and 1/3 on February 24, 2029. Represents the distribution of shares from a Grantor Retained Annuity Trust (GRAT) as an annuity payment to the reporting person, who is the grantor of the trust. Represents shares to be withheld by the Issuer to satisfy tax withholding obligations of the Reporting Person that arose upon the vesting of certain restricted stock. Shares are held directly by the John David Schmitz 2024 Annuity Trust DTD November 13, 2024, of which the reporting person is the trustee. /s/ Schmitz, John D by Calla Hackler, as Attorney-in-Fact 2026-02-25