Matthew J Mainer
Insider
First SEC filing: Dec. 5, 2022 · Latest: Dec. 5, 2022
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Dec. 4, 2025 | POST | G | 600 | · | · | 74,670 Direct | -0.80% | Disposed | (price as of 2026-10-02) |
| Dec. 1, 2025 | POST | F | 269 | $104.03 | $27,984 | 75,270 Direct | -0.36% | Disposed | -30.3% (price as of 2026-10-02) |
| Nov. 18, 2025 | POST | A | 17,338 | · | · | 67,416 Direct | +34.62% | Acquired | (price as of 2026-10-02) |
| Nov. 18, 2025 | POST | A | 8,123 | · | · | 75,539 Direct | +12.05% | Acquired | (price as of 2026-10-02) |
| Nov. 15, 2025 | POST | F | 937 | $106.70 | $99,978 | 50,078 Direct | -1.84% | Disposed | -32.0% (price as of 2026-10-02) |
| Nov. 14, 2025 | POST | F | 1,249 | $106.34 | $132,819 | 51,015 Direct | -2.39% | Disposed | -31.8% (price as of 2026-10-02) |
| Nov. 12, 2025 | POST | M | 6,008 | · | · | 52,720 Direct | +12.86% | Acquired | (price as of 2026-10-02) |
| Nov. 12, 2025 | POST | F | 2,647 | $106.02 | $280,635 | 50,073 Direct | -5.02% | Disposed | -31.6% (price as of 2026-10-02) |
| Nov. 12, 2025 | POST | M | 3,916 | · | · | 53,989 Direct | +7.82% | Acquired | (price as of 2026-10-02) |
| Nov. 12, 2025 | POST | F | 1,725 | $106.02 | $182,884 | 52,264 Direct | -3.20% | Disposed | -31.6% (price as of 2026-10-02) |
| Nov. 12, 2025 | POST | M | 6,008 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Nov. 12, 2025 | POST | M | 3,916 | · | · | 7,833 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| Oct. 22, 2025 | POST | A | 16,588 | · | · | 54,020 Direct | +44.32% | Acquired | (price as of 2026-10-02) |
| Oct. 22, 2025 | POST | F | 7,308 | $107.19 | $783,345 | 46,712 Direct | -13.53% | Disposed | -32.3% (price as of 2026-10-02) |
| Dec. 5, 2024 | POST | G | 500 | · | · | 37,432 Direct | -1.32% | Disposed | (price as of 2026-10-02) |
| Dec. 1, 2024 | POST | F | 269 | $120.48 | $32,409 | 40,338 Direct | -0.66% | Disposed | -39.8% (price as of 2026-10-02) |
| Dec. 1, 2024 | POST | F | 2,047 | $120.48 | $246,623 | 38,291 Direct | -5.07% | Disposed | -39.8% (price as of 2026-10-02) |
| Dec. 1, 2024 | POST | F | 359 | $120.48 | $43,252 | 37,932 Direct | -0.94% | Disposed | -39.8% (price as of 2026-10-02) |
| Nov. 20, 2024 | POST | F | 623 | $110.31 | $68,723 | 40,607 Direct | -1.51% | Disposed | -34.2% (price as of 2026-10-02) |
| Nov. 15, 2024 | POST | F | 940 | $107.78 | $101,313 | 41,230 Direct | -2.23% | Disposed | -32.7% (price as of 2026-10-02) |
| Nov. 14, 2024 | POST | F | 2,404 | $109.47 | $263,166 | 44,486 Direct | -5.13% | Disposed | -33.7% (price as of 2026-10-02) |
| Nov. 14, 2024 | POST | F | 1,252 | $109.47 | $137,056 | 43,234 Direct | -2.81% | Disposed | -33.7% (price as of 2026-10-02) |
| Nov. 14, 2024 | POST | F | 1,064 | $109.47 | $116,476 | 42,170 Direct | -2.46% | Disposed | -33.7% (price as of 2026-10-02) |
| Nov. 13, 2024 | POST | A | 11,749 | · | · | 11,749 Direct | · | Acquired | (price as of 2026-10-02) |
| Nov. 13, 2024 | POST | A | 6,008 | · | · | 6,008 Direct | · | Acquired | (price as of 2026-10-02) |
| Oct. 21, 2024 | POST | A | 6,326 | · | · | 49,683 Direct | +14.59% | Acquired | (price as of 2026-10-02) |
| Oct. 21, 2024 | POST | F | 2,793 | $115.21 | $321,782 | 46,890 Direct | -5.62% | Disposed | -37.0% (price as of 2026-10-02) |
| Dec. 1, 2023 | POST | F | 2,054 | $85.53 | $175,679 | 44,762 Direct | -4.39% | Disposed | -15.2% (price as of 2026-10-02) |
| Dec. 1, 2023 | POST | F | 360 | $85.53 | $30,791 | 44,402 Direct | -0.80% | Disposed | -15.2% (price as of 2026-10-02) |
| Dec. 1, 2023 | POST | F | 270 | $85.53 | $23,093 | 44,132 Direct | -0.61% | Disposed | -15.2% (price as of 2026-10-02) |
| Dec. 1, 2023 | POST | F | 775 | $85.53 | $66,286 | 43,357 Direct | -1.76% | Disposed | -15.2% (price as of 2026-10-02) |
| Nov. 20, 2023 | POST | F | 308 | $86.17 | $26,540 | 47,859 Direct | -0.64% | Disposed | -15.8% (price as of 2026-10-02) |
| Nov. 20, 2023 | POST | F | 626 | $86.17 | $53,942 | 47,233 Direct | -1.31% | Disposed | -15.8% (price as of 2026-10-02) |
| Nov. 20, 2023 | POST | F | 417 | $86.17 | $35,933 | 46,816 Direct | -0.88% | Disposed | -15.8% (price as of 2026-10-02) |
| Nov. 15, 2023 | POST | F | 942 | $85.50 | $80,541 | 48,167 Direct | -1.92% | Disposed | -15.1% (price as of 2026-10-02) |
| Nov. 14, 2023 | POST | A | 8,502 | · | · | 41,256 Direct | +25.96% | Acquired | (price as of 2026-10-02) |
| Nov. 14, 2023 | POST | A | 5,445 | · | · | 46,701 Direct | +13.20% | Acquired | (price as of 2026-10-02) |
| Nov. 14, 2023 | POST | A | 2,408 | · | · | 49,109 Direct | +5.16% | Acquired | (price as of 2026-10-02) |
| Aug. 20, 2023 | POST | F | 170 | $88.09 | $14,975 | 32,754 Direct | -0.52% | Disposed | -17.6% (price as of 2026-10-02) |
| Dec. 1, 2022 | POST | F | 781 | $94.09 | $73,484 | 35,629 Direct | -2.15% | Disposed | -22.9% (price as of 2026-10-02) |
| Dec. 1, 2022 | POST | F | 272 | $94.09 | $25,592 | 35,357 Direct | -0.76% | Disposed | -22.9% (price as of 2026-10-02) |
| Dec. 1, 2022 | POST | F | 2,070 | $94.09 | $194,766 | 33,287 Direct | -5.85% | Disposed | -22.9% (price as of 2026-10-02) |
| Dec. 1, 2022 | POST | F | 363 | $94.09 | $34,155 | 32,924 Direct | -1.09% | Disposed | -22.9% (price as of 2026-10-02) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Nov. 12, 2025 | POST | Restricted Stock Units | Common Stock | · | · | 6,008 | Disposed |
| Nov. 12, 2025 | POST | Restricted Stock Units | Common Stock | · | · | 3,916 | Disposed |
| Nov. 13, 2024 | POST | Restricted Stock Units | Common Stock | · | · | 11,749 | Acquired |
| Nov. 13, 2024 | POST | Restricted Stock Units | Common Stock | · | · | 6,008 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Dec. 5, 2022 | POST | Common Stock | 36,142 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $664,167 | · | · | · | · | $75,865 | $25,150 | $7,212,667 |
| 2024 | $479,187 | · | · | · | · | $362,407 | $46,295 | $3,497,506 |
| 2023 | $431,511 | · | · | · | · | · | $39,479 | $2,684,266 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.