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Post Holdings stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions−20.8% to $83.05
Post Holdings (POST) stock fell 21% over the last 252 sessions, to $83.05. On the way it reported 4 quarters, its insiders filed 7 open-market trades and 1 Form 144 notice of planned sales, and the company filed 9 material 8-Ks. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Oct 16, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.4% (−1.8% vs SPY) | +2.5% (+3.0% vs SPY) | — |
| Sep 2, 2026 | Insider sale | Stiritz William P sold $23.4M | +0.9% (+0.4% vs SPY) | −3.1% (−3.1% vs SPY) | −13.8% (−14.3% vs SPY) |
| Sep 1, 2026 | Insider sale | Stiritz William P sold $8.9M | +0.3% (+1.0% vs SPY) | −1.2% (−1.1% vs SPY) | −13.5% (−13.1% vs SPY) |
| Aug 31, 2026 | Form 144 | Form 144: William P Stiritz plans to sell $32.8M | −2.4% (−2.1% vs SPY) | −0.8% (−0.9% vs SPY) | −15.0% (−14.6% vs SPY) |
| Aug 7, 2026 | 8-K | Directors and officers: departures, appointments, pay | −3.2% (−3.1% vs SPY) | +2.8% (+2.4% vs SPY) | +4.6% (+5.5% vs SPY) |
| Aug 6, 2026 | Earnings | Earnings: beat the EPS estimate by 4.3% | +1.1% (+1.3% vs SPY) | −10.2% (−10.5% vs SPY) | −5.7% (−6.2% vs SPY) |
| May 13, 2026 | Insider sale | Curl Gregory L sold $650K | +1.5% (+1.0% vs SPY) | −5.1% (−4.5% vs SPY) | −9.8% (−9.8% vs SPY) |
| May 7, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.9% (−1.7% vs SPY) | −0.2% (−2.5% vs SPY) | −13.4% (−14.5% vs SPY) |
| May 7, 2026 | Earnings | Earnings: beat the EPS estimate by 10.9% | −0.7% (−0.4% vs SPY) | +0.5% (−0.6% vs SPY) | −13.8% (−14.3% vs SPY) |
| Mar 13, 2026 | 8-K | New debt or off-balance-sheet obligation | −0.8% (−1.8% vs SPY) | −1.8% (0.0% vs SPY) | +2.2% (−2.9% vs SPY) |
| Feb 9, 2026 | Insider sale | Curl Gregory L sold $798K | −0.6% (−1.1% vs SPY) | −2.4% (−1.1% vs SPY) | −9.7% (−7.7% vs SPY) |
| Feb 5, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.1% (+1.2% vs SPY) | +5.9% (+5.1% vs SPY) | +1.0% (+3.1% vs SPY) |
| Feb 5, 2026 | 8-K | Directors and officers: departures, appointments, pay | +9.3% (+7.4% vs SPY) | +5.6% (+5.0% vs SPY) | +1.0% (+0.9% vs SPY) |
| Feb 5, 2026 | Earnings | Earnings: beat the EPS estimate by 27.7% | −0.1% (+1.2% vs SPY) | +5.9% (+5.1% vs SPY) | +1.0% (+3.1% vs SPY) |
| Dec 19, 2025 | 8-K | New debt or off-balance-sheet obligation | +0.2% (−0.5% vs SPY) | −0.9% (−2.0% vs SPY) | −1.8% (−3.1% vs SPY) |
| Dec 5, 2025 | Insider sale | Harper Bradly A sold $160K | −1.9% (−2.1% vs SPY) | −0.3% (−1.0% vs SPY) | +0.7% (−0.6% vs SPY) |
| Nov 25, 2025 | Insider sale | Catoggio Nicolas sold $1.0M | +4.0% (+3.1% vs SPY) | +1.6% (−0.3% vs SPY) | +4.3% (+0.8% vs SPY) |
| Nov 24, 2025 | Insider buy | Kemper David W bought $176K | −2.4% (−3.9% vs SPY) | +0.5% (−2.6% vs SPY) | +1.3% (−3.3% vs SPY) |
| Nov 21, 2025 | 8-K | Directors and officers: departures, appointments, pay | −2.4% (−3.9% vs SPY) | +0.5% (−2.6% vs SPY) | +1.3% (−3.3% vs SPY) |
| Nov 20, 2025 | 8-K | Directors and officers: departures, appointments, pay | −7.4% (−8.4% vs SPY) | −2.9% (−7.5% vs SPY) | −5.8% (−11.0% vs SPY) |
| Nov 20, 2025 | Earnings | Earnings: beat the EPS estimate by 11.4% | +0.1% (+1.7% vs SPY) | −3.9% (−6.5% vs SPY) | −5.9% (−8.8% vs SPY) |
Insiders’ record here
In the year on the chart, Post Holdings' insiders reported 1 open-market buy ($176K) and 6 sales ($34.9M). Of the 5 old enough to score, 3 were followed by the stock doing what the trade implied over the next 63 sessions (beating SPY after a buy, lagging it after a sale); the median excess return after a buy was +5.8% and after a sale +3.6%.
Across the whole universe (19,782 scored trades), insider buys beat the market 46% of the time and sales were followed by a lagging stock 61% of the time; buys of $1M or more 39%. Every pattern →
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
| 2.03 New debt or off-balance-sheet obligation | 13,268 | 0.0% | 50% | +1.2% | ±1.3% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
Report card: every quarter against the estimate → Post Holdings: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.