Matthew J. Mainer, Executive Vice President, CFO and Treasurer of Post Holdings, Inc., filed a Form 4 on October 26, 2026, reporting the payout of a performance share award and a related tax withholding transaction, both dated October 22, 2026.

Key Highlights

  • Performance award payout: Mainer acquired 18,024 shares of common stock at $0, representing earned performance restricted stock units (PRSUs) under a shareholder-approved equity plan.
  • Performance period: The PRSUs were earned based on relative total shareholder return percentile rank for the period October 1, 2023 through September 30, 2026, according to the filing.
  • Tax withholding: 7,940 shares were surrendered at $78.06 per share to cover tax withholding obligations arising from the PRSU vesting.
  • Resulting ownership: Following both transactions, Mainer directly beneficially owned 84,754 shares of common stock.
  • Issuer and ticker: The issuer is Post Holdings, Inc., listed as NYSE:POST.

Post Holdings CFO PRSU Payout and Tax Withholding: October 2026 Transactions

According to the Form 4 filed with the SEC on October 26, 2026, Matthew J. Mainer, who serves as Executive Vice President, CFO and Treasurer of Post Holdings, Inc. (NYSE:POST), reported two transactions in the company's common stock, both occurring on October 22, 2026. The filing was signed by Diedre J. Gray as Attorney-in-Fact.

The first transaction was the acquisition of 18,024 shares of common stock at a price of $0, coded as an acquisition (A). The filing states this was a payout of earned PRSUs pursuant to Rule 16b-3, under a shareholder-approved equity plan. The award was based on the level of achievement of the performance goal of relative total shareholder return percentile rank for the performance period October 1, 2023 through September 30, 2026. Following this acquisition, Mainer's direct beneficial ownership stood at 92,694 shares.

The second transaction, coded F, involved the surrender of 7,940 shares at a price of $78.06 per share. According to the filing, this surrender represented shares withheld in payment of tax withholding due as a result of the vesting of the 18,024 PRSUs, also in accordance with Rule 16b-3. After this disposition, Mainer's reported direct beneficial ownership totaled 84,754 shares of Post Holdings common stock. No derivative securities were reported in the filing.

What Was Disclosed

The filing disclosed a PRSU payout of 18,024 shares to Mainer on October 22, 2026, following a three-year performance period, and the concurrent surrender of 7,940 shares at $78.06 to satisfy tax withholding, leaving him with 84,754 shares directly held.