X0508 4 2025-12-04 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 544444.00 D Class A Common Stock 300000.00 I By B-29 Investments, LP 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 2025-12-04 4 S false 187442.00 11.15 D 1559106.00 I By Family Trust Class A Common Stock 2025-12-05 4 S false 62480.00 11.21 D 1496626.00 I By Family Trust Class A Common Stock 2025-12-04 4 S false 3946.00 11.15 D 32687.00 I By Family Trust for Child 1 Class A Common Stock 2025-12-05 4 S false 1316.00 11.21 D 31372.00 I By Family Trust for Child 1 Class A Common Stock 2025-12-04 4 S false 3946.00 11.15 D 32688.00 I By Family Trust for Child 2 Class A Common Stock 2025-12-05 4 S false 1316.00 11.21 D 31373.00 I By Family Trust for Child 2 Class A Common Stock 2025-12-04 4 S false 3946.00 11.15 D 32688.00 I By Family Trust for Child 3 Class A Common Stock 2025-12-05 4 S false 1316.00 11.21 D 31373.00 I By Family Trust for Child 3 Class A Common Stock 2025-12-04 4 S false 3946.00 11.15 D 32687.00 I By Family Trust for Child 4 Class A Common Stock 2025-12-05 4 S false 1316.00 11.21 D 31372.00 I By Family Trust for Child 4 Class A Common Stock 2025-12-04 4 S false 3946.00 11.15 D 32688.00 I By Family Trust for Child 5 Class A Common Stock 2025-12-05 4 S false 1316.00 11.21 D 31373.00 I By Family Trust for Child 5 Class A Common Stock 2025-12-04 4 S false 3946.00 11.15 D 32688.00 I By Family Trust for Child 6 Class A Common Stock 2025-12-05 4 S false 1315.00 11.21 D 31373.00 I By Family Trust for Child 6 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. This transaction was executed in multiple trades at prices ranging from $11.0000 USD to $11.2700 USD; the price reported above reflects the weighted average sale price. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4. This transaction was executed in multiple trades at prices ranging from $11.0900 USD to $11.3300 USD; the price reported above reflects the weighted average sale price. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4. These indirect holdings have been adjusted to correct a clerical error that was made on the reporting person's prior Form 4, which understated each trust's holdings by one share of Class A Common Stock. /s/ Schmitz, John D by Calla Hackler, as Attorney-in-Fact 2025-12-08