TETRA Technologies, Inc.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On October 27, 2025, TETRA Technologies, Inc. (“TETRA” or the “Company”) announced that on October 24, 2025 Elijio V. Serrano informed the Company that he intends to retire from his position as Senior Vice President, Chief Financial Officer (principal financial officer) of TETRA, effective March 31, 2026. It is anticipated that Mr. Serrano will be retained as an advisor to Brady Murphy, CEO and President, on terms to be agreed upon. The Company will file an amendment to this Current Report on Form 8-K after the terms of Mr. Serrano’s continuing compensation arrangements are determined. TETRA also announced that its board of directors has appointed Matthew J. Sanderson as Executive Vice President and Chief Financial Officer (principal financial officer), to be effective upon Mr. Serrano’s retirement from such position. Mr. Sanderson currently serves as the Executive Vice President and Chief Commercial Officer of TETRA and will continue to manage certain responsibilities associated with this position. Matthew J. Sanderson, 52, has served as our Executive Vice President and Chief Commercial Officer since September 2022. From December 2016 until September 2022, he served as our Senior Vice President responsible for our Water and Flowback Services division and our global Completion Fluids and Products division. Prior to joining TETRA, Mr. Sanderson spent over 19 years working at Schlumberger in various operational and functional leadership roles in North America and internationally. He earned a Bachelor of Applied Science in Civil Engineering (Environmental Option) from Queen's University in Kingston, Canada and a Master of Science in Oil and Gas Industry Management from Heriot-Watt University in Edinburgh, Scotland. At this time, any changes to Mr. Sanderson’s compensatory arrangements in connection with his appointment as Executive Vice President and Chief Financial Officer have not been determined. The Company will file an amendment to this Current Report on Form 8-K after such arrangements are determined. There are no arrangements or understandings between Mr. Sanderson and any other person pursuant to which he was appointed. There are no family relationships, as defined in Item 401 of SEC Regulation S-K, between Mr. Sanderson and any of TETRA’s executive officers or directors or persons nominated or chosen to become a director or executive officer. There is no transaction in which Mr. Sanderson has an interest requiring disclosure under Item 404(a) of SEC Regulation S-K. A copy of TETRA’s news release relating to the foregoing is attached to this Current Report on Form 8-K and is incorporated by reference.