Post Holdings, Inc.: evp, cfo & treasurer Matthew J Mainer received 18,024 shares

What happened

• Matthew J Mainer, evp, cfo & treasurer of Post Holdings, Inc., received 18,024 shares on Oct 22, 2026 as the payout of earned performance share awards (award code A) at $0.00 per share. On the same date he surrendered 7,940 shares to cover tax withholding (code F) at $78.06 per share for proceeds of $619,796.

Key details

• Transaction dates and prices: Oct 22, 2026 — 18,024 shares acquired at $0.00 (award); Oct 22, 2026 — 7,940 shares surrendered at $78.06 for $619,796.
• Shares owned after the transaction: not reported in the filing.
• Footnotes: payout of performance share award (PRSUs) under a shareholder-approved equity plan based on relative total shareholder return for the period Oct 1, 2023 through Sep 30, 2026 (F1); shares were surrendered to satisfy tax withholding due on vesting (F2).
• Filing date: Oct 26, 2026 (no late filing flag shown).

Why it may matter

• The filing shows a payout of performance share units and the surrender of a portion of those shares to cover tax withholding (a non-market surrender of shares).
• A filing does not show why the insider traded or why the company acted.