MTX: Other company developments

Item 8.01 Other Events. On June 29, 2026, Minerals Technologies Inc. (“MTI”) issued a press release (the “Press Release”) announcing that, together with certain of its affiliates, it has filed a Plan of Reorganization in the Chapter 11 cases of BMI OldCo Inc. (formerly Barretts Minerals Inc.) and its affiliated debtors pending before the U.S. Bankruptcy Court for the Southern District of Texas. A copy of the Press Release is furnished as Exhibit 99.1 hereto, and is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits. (d) Exhibits 99.1 Press Release dated June 29, 2026 104 Cover Page Interactive Data File (formatted as inline XBRL) 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. MINERALS TECHNOLOGIES INC. (Registrant) By: /s/ Timothy J. Jordan Name: Timothy J. Jordan Title: Vice President, General Counsel, Secretary and Chief Compliance Officer Date: June 29, 2026