ARGIRAKIS BRETT 4

What Happened Brett Argirakis, Group President of Minerals Technologies (MTX), converted 3,112 DRSUs into common shares on January 21, 2026 (code M). The conversion had no cash exercise price ($0). To satisfy tax withholding obligations (code F), 1,457 of those shares were withheld by the company at a reported value of $66.92 per share, totaling $97,502. The withholding is an internal settlement to cover taxes rather than an open-market sale.

Key Details

• Transaction date: January 21, 2026; Form 4 filed January 23, 2026 (timely).
• Conversion: 3,112 DRSUs → 3,112 shares (exercise/conversion, code M) at $0 exercise price.
• Withholding: 1,457 shares withheld to satisfy tax obligations (code F) at $66.92/share = $97,502.
• Shares owned after the transaction: not specified in the information provided on this filing.
• Footnotes: F1 notes shares were withheld by Minerals Technologies to satisfy tax withholding. F2–F4 state the report is based on a Plan Statement dated Jan 21, 2026; each DRSU equals one share; the DRSUs were granted Jan 21, 2025 and vest in three equal annual installments beginning Jan 21, 2026.
• Transaction codes: M = exercise/conversion of derivative (DRSU); F = payment of tax liability / shares withheld.

Context These were DRSU vesting/conversion and tax-withholding transactions tied to executive compensation — common, routine events when equity awards vest. The withheld shares represent an internal tax settlement (not a market sale), so this filing does not necessarily indicate a deliberate sale of stock by the insider.