ALDAG ERIK 4

What Happened
Erik Aldag, SVP Finance & Treasury and CFO of Minerals Technologies (MTX), had 2,245 deferred restricted stock units (DRSUs) convert to common shares on January 21, 2026. The DRSUs converted at no cash exercise price (reported as $0). To satisfy tax withholding obligations, 1,356 of the newly issued shares were surrendered/withheld (reported at $66.92 per share) for a tax-withholding value of $90,744, leaving a net issuance of 889 shares to Aldag.

Key Details

• Transaction date: January 21, 2026; Form 4 filed January 23, 2026 (filed within the typical 2-business-day window).
• Conversion/exercise code: M (exercise or conversion of a derivative instrument — here, DRSUs converting into common stock).
• Tax-withholding code: F (shares withheld to satisfy tax obligations): 1,356 shares @ $66.92 = $90,744.
• Gross shares converted: 2,245 DRSUs; net shares retained after withholding: 889 (2,245 − 1,356).
• Footnotes: DRSUs are economic equivalents of one share (granted Jan 21, 2025) and vest in three equal annual installments beginning Jan 21, 2026. Withholding was performed by Minerals Technologies to satisfy tax liability.

Context
This was a routine vesting/conversion of previously granted equity (not an open-market purchase or sale). The withholding of shares to cover taxes is a common cashless method and does not by itself indicate a decision to sell remaining shares. The transaction is informational for shareholders tracking insider equity but does not, alone, signal a change in company outlook.