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NONCONTROLLING INTERESTS - Effect of Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Effects of changes in noncontrolling interests on equity |  |  |  |
Net Income (Loss) | $ 21,035 | $ 10,647 | $ 29,641 | $ 18,886
Transfers from noncontrolling interests: |  |  |  |
Increase in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units | (1,208) | $ (285) | (9,424) | (6,652)
Increase in additional paid-in capital as a result of exchanges of SES Holdings LLC Units (an equivalent number of shares of Class B Common Stock) for shares of Class A Common Stock | $ (3,185) |  |  |
Ses Holdings Llc |  |  |  |
Effects of changes in noncontrolling interests on equity |  |  |  |
Net Income (Loss) |  |  | 29,641 | 18,886
Transfers from noncontrolling interests: |  |  |  |
Decrease in additional paid-in capital from reallocation to Class B holders in connection with underwritten offering |  |  | (8,283) |
Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures |  |  | 1,787 | 1,115
Increase in additional paid-in capital as a result of vested PSUs |  |  | 530 | 406
Increase in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units |  |  | 904 | 507
Increase in additional paid-in capital as a result of exchanges of SES Holdings LLC Units (an equivalent number of shares of Class B Common Stock) for shares of Class A Common Stock |  |  | 40,513 |
Change to equity from net income attributable to Select Water Solutions, Inc. and transfers from noncontrolling interests |  |  | $ 65,092 | $ 20,914

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