TTI

tti-202602250000844965FALSEFebruary 25, 202600008449652026-02-252026-02-250000844965us-gaap:CommonStockMember2026-02-252026-02-250000844965us-gaap:SeriesAPreferredStockMember2026-02-252026-02-25

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 25, 2026

TETRA Technologies, Inc. (Exact Name of Registrant as Specified in Charter)

Delaware 1-13455 74-2148293

(State or Other Jurisdiction of Incorporation) (Commission File Number) (I.R.S. Employer Identification No.)

10000 Energy Drive Spring, Texas 77389 (Address of Principal Executive Offices, and Zip Code)

(281) 367-1983

(Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communication pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Common Stock TTI New York Stock Exchange

Preferred Share Purchase Right N/A New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02. Results of Operations and Financial Condition. On February 25, 2026, TETRA Technologies, Inc., a Delaware corporation (the “Company”), issued a news release announcing its financial results for the fourth quarter and total year ended December 31, 2025. The news release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

The information furnished in this Item 2.02 and in Exhibit 99.1 to this Current Report shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit Number Description

99.1 News Release dated February 25, 2026 issued by TETRA Technologies, Inc.

104 Cover Page Interactive Data File (embedded within the inline XBRL document)

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

TETRA Technologies, Inc.

By: /s/Brady M. Murphy

Brady M. Murphy.

President and Chief Executive Officer

Date: February 25, 2026

3

tti-202510280000844965FALSEOctober 28, 202500008449652025-10-282025-10-280000844965us-gaap:CommonClassAMember2025-10-282025-10-280000844965us-gaap:CommonStockMember2025-10-282025-10-280000844965us-gaap:SeriesAPreferredStockMember2025-10-282025-10-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 28, 2025

TETRA Technologies, Inc. (Exact Name of Registrant as Specified in Charter)

Delaware1-1345574-2148293 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

24955 Interstate 45 North The Woodlands, Texas 77380 (Address of Principal Executive Offices, and Zip Code)

(281) 367-1983 Registrant’s Telephone Number, Including Area Code

(Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communication pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common StockTTINew York Stock Exchange Preferred Share Purchase RightN/ANew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02. Results of Operations and Financial Condition.

On October 28, 2025, TETRA Technologies, Inc., a Delaware corporation (the “Company”), issued a news release announcing its financial results for the third quarter of 2025. The news release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

The information furnished in this Item 2.02 and in Exhibit 99.1 to this Current Report shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit NumberDescription 99.1News Release dated October 28, 2025 issued by TETRA Technologies, Inc.

104Cover Page Interactive Data File (embedded within the inline XBRL document)

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

TETRA Technologies, Inc.

By:/s/Brady M. Murphy

Brady M. Murphy

President and Chief Executive Officer

Date: October 28, 2025

3

tti-202507290000844965FALSEJuly 29, 202500008449652025-07-292025-07-290000844965us-gaap:CommonClassAMember2025-07-292025-07-290000844965us-gaap:CommonStockMember2025-07-292025-07-290000844965us-gaap:SeriesAPreferredStockMember2025-07-292025-07-29

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 29, 2025

TETRA Technologies, Inc. (Exact Name of Registrant as Specified in Charter)

Delaware1-1345574-2148293 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

24955 Interstate 45 North The Woodlands, Texas 77380 (Address of Principal Executive Offices, and Zip Code)

(281) 367-1983 Registrant’s Telephone Number, Including Area Code

(Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communication pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common StockTTINew York Stock Exchange Preferred Share Purchase RightN/ANew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02. Results of Operations and Financial Condition.

On July 29, 2025, TETRA Technologies, Inc., a Delaware corporation (the “Company”), issued a news release announcing its financial results for the second quarter of 2025. The news release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

The information furnished in this Item 2.02 and in Exhibit 99.1 to this Current Report shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit NumberDescription 99.1News Release dated July 29, 2025 issued by TETRA Technologies, Inc.

104Cover Page Interactive Data File (embedded within the inline XBRL document)

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

TETRA Technologies, Inc.

By:/s/Brady M. Murphy

Brady M. Murphy

President and Chief Executive Officer

Date: July 29, 2025

3