X0508 4 2026-02-06 false 0001693256 Select Water Solutions, Inc. WTTR 0001539285 Schmitz John 1820 N I-35 GAINESVILLE TX 76240 true true false false President & CEO true Class A Common Stock 2026-02-06 4 S false 16841.00 13.01 D 283159.00 I By B-29 Investments, LP Class A Common Stock 2026-02-09 4 S false 33916.00 13.03 D 249243.00 I By B-29 Investments, LP Class A Common Stock 2026-02-09 4 A false 91154.00 0.00 A 635598.00 D Class A Common Stock 2026-02-09 4 F false 36116.00 12.96 D 599482.00 D Class A Common Stock 539388.00 I By GRAT Class A Common Stock 539387.00 I By GRAT Class A Common Stock 13126.00 I By B-29 GP, LLC 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 sales reported in this Form 4 were effected pursuant to the 10b5-1 trading plan adopted by the Reporting Person on November 11, 2024. The transaction was executed in multiple trades at prices ranging from $13.0000 USD to $13.0500 USD, the price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide Select Water Solutions, Inc., a Delaware corporation (the "Issuer"), any security holder of the Issuer or the staff of the U.S. Securities and Exchange Commission, upon receipt, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4. The transaction was executed in multiple trades at prices ranging from $13.0000 USD to $13.1000 USD, the price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the U.S. Securities and Exchange Commission, upon receipt, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4. The reported shares are represented by performance share units ("PSUs") earned pursuant to the terms of a performance share unit award granted on February 24, 2023, to the reporting person for which the performance conditions were satisfied. Represents shares to be withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon vesting of the PSUs. Shares are held directly by the John David Schmitz 2024 Annuity Trust DTD November 13, 2024, of which the reporting person is the trustee. Shares are held directly by the Sandra Lee 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 2026-02-10