DIETRICH DOUGLAS T 4

What Happened

• Douglas T. Dietrich, Chairman and CEO of Minerals Technologies (MTX), exercised vested deferred restricted stock units (DRSUs) in two events (Jan 23 and Jan 26, 2026). He received 11,016 shares on Jan 23 and 11,123 shares on Jan 26 (exercise/conversion recorded at $0.00 per share because these were unit conversions).
• To satisfy tax withholding obligations, the company withheld 6,092 shares on Jan 23 at $68.77 per share ($418,947) and 6,152 shares on Jan 26 at $68.89 per share ($423,811), a total of 12,244 shares withheld for taxes and roughly $842,758 in withholding value.
• These transactions reflect conversion/vesting of DRSUs and routine tax-withholding rather than an open-market sale by the insider.

Key Details

• Transaction dates: Jan 23, 2026 (11,016 DRSUs converted; 6,092 shares withheld at $68.77) and Jan 26, 2026 (11,123 DRSUs converted; 6,152 shares withheld at $68.89).
• Withholding totals: 12,244 shares withheld; cash value of withheld shares ≈ $842,758 (418,947 + 423,811).
• Shares owned after the transactions: not specified in the provided report.
• Footnotes: F1 — shares were withheld by Minerals Technologies to satisfy tax withholding; F3–F5 — these are DRSUs (each equals one share) granted in 2023 and 2024 with multi-year vesting (grants vest in three equal annual installments beginning in 2024 and 2025 per the footnotes); F2 — report based on Plan Statement as of Jan 21, 2026.
• Filing timing: Report filed Jan 27, 2026 covering transactions on Jan 23 and Jan 26. Note that insider reports are generally required within a short window after transactions; the Jan 23 event was reported four calendar days later—check the official filing for any late-filing disclosure.

Context

• These were DRSU conversions with company share withholding to cover taxes (transaction code F). That is a routine administrative step following vesting and does not necessarily reflect an intentional market sale by the insider.
• For retail investors: exercises and subsequent withholding are common when equity awards vest. Purchases by insiders are typically considered a clearer bullish signal than withholding/sales for taxes.