Matthew J. Mainer

Companies

• Post HoldingsChief financial officer Dec 5, 2022 to now¹

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Post Holdings POST74,670 shares²$5.8M at $77.39Dec 4, 2025

As of each latest filing. The line shows shares held over time.

Recent filings

• Dec 4, 2025Gift 600 shares of Post Holdings²
• Dec 1, 2025Shares withheld for tax 269 shares at $104.03 of Post Holdings³
• Nov 18, 2025Granted 8,123 shares of Post Holdings⁴
• Nov 18, 2025Granted 17,338 shares of Post Holdings⁴
• Nov 15, 2025Shares withheld for tax 937 shares at $106.70 of Post Holdings⁵
• Nov 14, 2025Shares withheld for tax 1,249 shares at $106.34 of Post Holdings⁵
• Nov 12, 2025Shares withheld for tax 1,725 shares at $106.02 of Post Holdings⁶
• Nov 12, 2025Exercised options 3,916 shares of Post Holdings⁶
• Nov 12, 2025Shares withheld for tax 2,647 shares at $106.02 of Post Holdings⁶
• Nov 12, 2025Exercised options 6,008 shares of Post Holdings⁶
• Oct 22, 2025Shares withheld for tax 7,308 shares at $107.19 of Post Holdings⁷
• Oct 22, 2025Granted 16,588 shares of Post Holdings⁷
• Dec 5, 2024Gift 500 shares of Post Holdings⁸
• Dec 1, 2024Shares withheld for tax 359 shares at $120.48 of Post Holdings⁹
• Dec 1, 2024Shares withheld for tax 2,047 shares at $120.48 of Post Holdings⁹
• Dec 1, 2024Shares withheld for tax 269 shares at $120.48 of Post Holdings⁹
• Nov 20, 2024Shares withheld for tax 623 shares at $110.31 of Post Holdings¹⁰
• Nov 15, 2024Shares withheld for tax 940 shares at $107.78 of Post Holdings¹¹
• Nov 14, 2024Shares withheld for tax 1,064 shares at $109.47 of Post Holdings¹¹
• Nov 14, 2024Shares withheld for tax 1,252 shares at $109.47 of Post Holdings¹¹
• Nov 14, 2024Shares withheld for tax 2,404 shares at $109.47 of Post Holdings¹¹
• Oct 21, 2024Shares withheld for tax 2,793 shares at $115.21 of Post Holdings¹²
• Oct 21, 2024Granted 6,326 shares of Post Holdings¹²
• Dec 1, 2023Shares withheld for tax 775 shares at $85.53 of Post Holdings¹³
• Dec 1, 2023Shares withheld for tax 270 shares at $85.53 of Post Holdings¹³