TETRA TECHNOLOGIES INC

Rule 10b5-1 Trading Arrangements

During the year ended December 31, 2025, no director or officer of TETRA adopted orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.

Amendment of Tax Benefits Preservation Plan

On February 19, 2026, the Board of Directors approved Amendment No. 1 (the “Amendment”) to the Tax Benefits Preservation Plan, dated as of February 28, 2023 (the “Tax Plan”), by and between the Company and Computershare Trust Company, N.A., as rights agent. The Company entered into the Amendment on February 25, 2026. The Amendment extends the expiration date of the Tax Plan from February 28, 2026 to February 28, 2029 (subject to other earlier termination events).

The Tax Plan, as amended by the Amendment is described in Note 2 - “Summary of Significant Accounting Policies” in the Notes to Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K and the Tax Plan is included as Exhibit 4.5 hereto. The foregoing description of the Amendment is qualified in its entirety by reference to the full text of the Amendment, attached hereto as Exhibit 4.7 and incorporated herein by reference.

In connection with the Amendment, the Company filed a Certificate of Designation of Series A Junior Participating Preferred Stock of the Company with the Secretary of State of the State of Delaware, which is attached hereto as Exhibit 3.1 and is incorporated herein by reference.