and Exhibit 99.1 shall not be deemed filed for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or 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.

Other Events. On July 22, 2026, the Company’s Board of Directors declared a regular quarterly dividend of $0.12 per share on the Company's common stock. The dividend is payable on September 4, 2026, to the stockholders of record on August 14, 2026. A copy of the press release announcing the dividend declaration is attached hereto as Exhibit 99.1 and incorporated by reference herein.

Other Events On May 19, 2026, the Company’s Board of Directors declared a regular quarterly dividend of $0.12 per share on the Company's common stock. The dividend is payable on June 18, 2026 to the stockholders of record on June 2, 2026. A copy of the press release announcing the dividend declaration is attached hereto as Exhibit 99.1 and incorporated by reference herein.

and Exhibit 99.1 shall not be deemed filed for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or 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.

Senior Vice President, M&A and Strategy — Jonathan J. Hastings: Mr. Hastings is stepping down from his position but will continue in a new role as Corporate Strategy Advisor.

Director — Alison A. Deans and Franklin L. Feder: Directors Alison A. Deans and Franklin L. Feder are retiring from the Board at the annual meeting.

and Exhibit 99.1 shall not be deemed filed for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or 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.

Other Events. On January 21, 2026, the Company’s Board of Directors declared a regular quarterly dividend of $0.12 per share on the Company's common stock. The dividend is payable on March 6, 2026, to the stockholders of record on February 13, 2026. A copy of the press release announcing the dividend declaration and the share repurchase program is attached hereto as Exhibit 99.1 and incorporated by reference herein.

Results of Operations and Financial Condition. On October 23, 2025, Minerals Technologies Inc. issued a press release regarding its financial performance for the third quarter of 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this

Other Events. On October 15, 2025, the Company’s Board of Directors declared a regular quarterly dividend of $0.12 per share on the Company's common stock. The dividend is payable on December 04, 2025, to the stockholders of record on October 30, 2025. A copy of the press release announcing the dividend declaration and the share repurchase program is attached hereto as Exhibit 99.1 and incorporated by reference herein.

Results of Operations and Financial Condition. On July 24, 2025, Minerals Technologies Inc. issued a press release regarding its financial performance for the second quarter of 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this

Other Events. On July 16, 2025, the Company’s Board of Directors declared a regular quarterly dividend of $0.11 per share on the Company's common stock. The dividend is payable on September 5, 2025, to the stockholders of record on August 15, 2025. A copy of the press release announcing the dividend declaration is attached hereto as Exhibit 99.1 and incorporated by reference herein.

Other Events On May 13, 2025, the Company’s Board of Directors declared a regular quarterly dividend of $0.11 per share on the Company's common stock. The dividend is payable on June 12, 2025 to the stockholders of record on May 30, 2025. A copy of the press release announcing the dividend declaration is attached hereto as Exhibit 99.1 and incorporated by reference herein.

Results of Operations and Financial Condition. On April 24, 2025, Minerals Technologies Inc. issued a press release regarding its financial performance for the first quarter of 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this

Results of Operations and Financial Condition. On April 17, 2025, Minerals Technologies Inc. issued a press release announcing certain preliminary financial results for the first quarter of 2025 and providing an update on its subsidiaries' Chapter 11 cases. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this

Results of Operations and Financial Condition. On February 6, 2025, Minerals Technologies Inc. issued a press release regarding its financial performance for the fourth quarter of 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this

Results of Operations and Financial Condition. On February 6, 2025, Minerals Technologies Inc. issued a press release regarding its financial performance for the fourth quarter of 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this

Other Events. On January 22, 2025, the Company’s Board of Directors declared a regular quarterly dividend of $0.11 per share on the Company's common stock. The dividend is payable on March 7, 2025, to the stockholders of record on February 14, 2025. A copy of the press release announcing the dividend declaration is attached hereto as Exhibit 99.1 and incorporated by reference herein.

Other Events On November 26, 2024, the Company issued a press release announcing the Amendment and the Amended Credit Agreement. The full text of the press release is included as Exhibit 99.1 to this Current Report on Form 8-K.

Entry into a Material Definitive Agreement On November 26, 2024, Minerals Technologies Inc., a Delaware corporation (the “ Company ”), entered into a Refinancing Facility Agreement and Incremental Facility Amendment (the “ Amendment ”) to amend the credit agreement dated as of May 9, 2014 (as amended by the Refinancing Facility Agreement, dated as of June 23, 2015, the Second Amendment, dated as of February 14, 2017, the Third Amendment and Incremental Facility Amendment, dated as of April 18…

Creation of a Direct Financial Obligation The items referred to under

Results of Operations and Financial Condition. On October 24, 2024, Minerals Technologies Inc. issued a press release regarding its financial performance for the third quarter of 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this

Other Events. On October 16, 2024, the Company’s Board of Directors declared a regular quarterly dividend of $0.11 per share on the Company's common stock. The dividend is payable on December 05, 2024, to the stockholders of record on October 31, 2024. On October 16, 2024, the Company’s Board of Directors authorized a new $200 million share repurchase program. The authorization is effective immediately. A copy of the press release announcing the dividend declaration and the share repurchase p…

Results of Operations and Financial Condition. On July 26, 2024, Minerals Technologies Inc. (the “Company”) held its second quarter 2024 earnings conference call. As a result of technical issues with our third party service provider for this conference call, some listeners were not able to hear a portion of the webcast audio feed. Participants accessing the webcast were able to view the accompanying presentation slides that were posted in advance of the call. To ensure complete access to all…

Results of Operations and Financial Condition. On July 25, 2024, Minerals Technologies Inc. issued a press release regarding its financial performance for the second quarter of 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The information in this