William P. Stiritz is Director at Post Holdings, Inc. (POST). They have made 14 open-market trades across 4 companies since 2000, most recently 2025-12-18.
CIK 0001052058
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
12 open-market purchases totalling $209.2M since 2000, against 2 sales. Across 11 scored buys the stock is up 4.6% at ninety days, and 0.8 points behind the S&P over the same stretch.
11 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 64% | 64% | 73% |
| Avg Move | +0.2% | +1.2% | +4.6% |
| Alpha | -0.2% | -1.4% | -0.8% |
| Scored | 11 | 11 | 11 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| POST | BUY | 2025-08-19 | 2025-08-21 | $109.53 | $3.9M | -1.5% | -8.9% | -5.1% |
| POST | BUY | 2025-06-05 | 2025-06-09 | $109.12 | $40.8M | +1.2% | -4.9% | -4.4% |
| POST | BUY | 2019-02-08 | 2019-02-12 | $97.75 | $7.0M | -3.0% | -0.9% | +2.2% |
| POST | BUY | 2019-02-06 | 2019-02-08 | $96.71 | $25.9M | +3.2% | +1.8% | +9.1% |
| POST | BUY | 2018-02-12 | 2018-02-14 | $71.99 | $14.4M | +2.7% | +1.9% | +0.8% |
| POST | BUY | 2017-05-17 | 2017-10-11 | $81.74 | $1.1M | -3.7% | -8.6% | -8.0% |
| POST | BUY | 2016-11-21 | 2016-11-23 | $75.57 | $16.6M | +1.8% | +6.6% | +11.4% |
| POST | BUY | 2016-11-21 | 2016-11-23 | $75.48 | $9.1M | +1.8% | +6.6% | +11.4% |
| POST | BUY | 2016-02-08 | 2016-02-09 | $63.69 | $52.8M | +5.3% | +10.7% | +18.5% |
| POST | BUY | 2016-02-08 | 2016-11-23 | $66.04 | $2.4M | +1.8% | +6.6% | +11.4% |
| RAH | SELL | 2009-02-18 | 2009-02-20 | $62.37 | $3.4M | N/A | N/A | N/A |
| RAH | SELL | 2008-11-14 | 2008-11-18 | $66.71 | $20.0M | N/A | N/A | N/A |
| FD | BUY | 2006-03-31 | 2006-04-04 | $72.93 | $20.4M | N/A | N/A | N/A |
| ENR | BUY | 2000-05-08 | 2008-04-23 | $16.65 | $14.8M | -6.8% | +3.0% | +3.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.