UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 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 1, 2026

MINERALS TECHNOLOGIES INC.

(Exact name of registrant as specified in its charter)

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:

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

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

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. ☐

Pricing of Notes Offering

On October 1, 2026, Minerals Technologies Inc. (the “Company”) issued a press release announcing the pricing of the previously announced private offering (the “Offering”) of $400 million aggregate principal amount of its 7.500% senior notes due 2032 (the “Notes”) in a transaction exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”), a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The Offering is expected to close on October 13, 2026, subject to customary closing conditions.

In connection with the Offering, the Company expects to amend its credit agreement (the “Credit Agreement Amendment”) to, among other things, increase the size of the revolving credit facility to $500.0 million and extend the maturity date of the revolving credit facility to the earlier of (i) the fifth anniversary of the effectiveness of the Credit Agreement Amendment and (ii) 91 days prior to the stated maturity date of the $575.0 million of senior secured term loans under the credit agreement (the “Term Loans”), unless as of such 91st day, all amounts in excess of $50.0 million of the Term Loans have been either (a) refinanced with indebtedness permitted under the credit agreement maturing later than 90 days after the scheduled maturity date of the Term Loans or (b) discharged or repaid (other than with the proceeds of any indebtedness maturing earlier than 91 days after the scheduled maturity date of the revolving credit facility). As of the date of this current report on Form 8-K, the Company has commitments for the full amount of the contemplated Credit Agreement Amendment. Commitments received to date are subject to satisfactory documentation and certain other conditions. The closing of this Offering is not conditioned on the closing of the Credit Agreement Amendment. The Credit Agreement Amendment is subject to market and other conditions and there can be no assurance as to whether or when the Credit Agreement Amendment may be completed on the contemplated terms, if at all.

The Notes and the related guarantees have not been registered under the Securities Act or the securities laws of any other jurisdiction and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state laws.

This current report does not constitute an offer to sell or a solicitation of an offer to buy the securities, nor shall there be any sale of the securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

Forward-Looking Statements

This current report contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, including statements regarding the Offering and the intended use of the proceeds thereof. Forward-looking statements provide current expectations and forecasts of future events such as new products, revenues, and financial performance, and are not limited to describing historical or current facts. They can be identified by the use of words such as “outlook,” “forecast,” “believes,” “expects,” “plans,” “intends,” “anticipates,” and other words and phrases of similar meaning. Forward-looking statements are necessarily based on assumptions, estimates, and limited information available at the time they are made. A broad variety of risks and uncertainties, both known and unknown, as well as the inaccuracy of assumptions and estimates, can affect the realization of the expectations or forecasts in these statements. Many of these risks and uncertainties are difficult to predict or are beyond the Company’s control. Consequently, no forward-looking statement can be guaranteed. Actual future results may vary materially. Significant factors that could affect the expectations and forecasts include worldwide general economic, business, and industry conditions; the cyclicality of our customers’ businesses and their changing regional demands; our ability to compete in very competitive industries; consolidation in customer industries, principally paper, foundry, and steel; our ability to renew or extend long term sales contracts for our satellite operations; our ability to generate cash to service our debt; our ability to comply with the covenants in the agreements governing our debt; our ability to effectively achieve and implement our growth initiatives or consummate the transactions described in the statements; our ability to successfully develop new products; our ability to defend our intellectual property; the increased risks of doing business abroad including with respect to changes in tariffs; the availability of raw materials and access to ore reserves at our mining operations, or increases in costs of raw materials, energy, or shipping; compliance with or changes to regulation in the areas of environmental, health, and safety, and tax; risks and uncertainties related to the voluntary petitions for relief under Chapter 11 of the U.S. Bankruptcy Code filed by our subsidiaries BMI OldCo Inc. (f/k/a Barretts Minerals Inc.) and Barretts Ventures Texas LLC; claims for legal, environmental, and tax matters or product stewardship issues; operating risks and capacity limitations affecting our production facilities; seasonality of some of our businesses; cybersecurity and other threats relating to our information technology systems; and other risk factors and cautionary statements in our 2025 Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and other reports filed with the Securities and Exchange Commission. The forward-looking statements contained in this current report speak only as of the date of this current report. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events, or otherwise. The Company may not consummate the Offering and, if the Offering is consummated, the Company cannot provide any assurances regarding the final terms of the Offering.

(d) Exhibits.

SIGNATURES

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