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Avantor stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+36.6% to $15.47
Avantor (AVTR) stock rose 37% over the last 252 sessions, to $15.47. On the way it reported 4 quarters, its insiders filed 5 open-market trades, and the company filed 11 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 28, 2026 | Earnings | Earnings: beat the EPS estimate by 5.6% | −2.6% (−2.9% vs SPY) | −9.4% (−7.4% vs SPY) | — |
| Sep 21, 2026 | 8-K | Directors and officers: departures, appointments, pay | −2.7% (−4.3% vs SPY) | −1.8% (−3.0% vs SPY) | +4.8% (+4.2% vs SPY) |
| Sep 21, 2026 | 8-K | Directors and officers: departures, appointments, pay | −2.7% (−4.3% vs SPY) | −1.8% (−3.0% vs SPY) | +4.8% (+4.2% vs SPY) |
| Aug 27, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.2% (0.0% vs SPY) | +3.9% (+3.6% vs SPY) | +4.5% (+5.0% vs SPY) |
| Jul 29, 2026 | Earnings | Earnings: beat the EPS estimate by 11.1% | +14.6% (+16.2% vs SPY) | +9.7% (+5.6% vs SPY) | +15.5% (+12.1% vs SPY) |
| Jul 17, 2026 | 8-K | Material definitive agreement | −3.8% (−3.6% vs SPY) | +3.3% (+3.9% vs SPY) | +19.8% (+16.0% vs SPY) |
| May 8, 2026 | Insider buy | Lucier Gregory T bought $83K | 0.0% (−0.8% vs SPY) | −4.5% (−6.8% vs SPY) | +15.4% (+14.3% vs SPY) |
| May 1, 2026 | Insider buy | Dingemans Simon bought $204K | −1.7% (−2.0% vs SPY) | +2.6% (+0.8% vs SPY) | +12.6% (+7.2% vs SPY) |
| Apr 29, 2026 | Earnings | Earnings: beat the EPS estimate by 8.2% | −0.1% (−0.1% vs SPY) | +2.4% (+0.7% vs SPY) | +15.2% (+9.4% vs SPY) |
| Apr 23, 2026 | 8-K | Directors and officers: departures, appointments, pay | +1.8% (+1.0% vs SPY) | +4.3% (+2.9% vs SPY) | +4.6% (−0.6% vs SPY) |
| Apr 1, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.9% (−1.6% vs SPY) | +2.0% (−1.9% vs SPY) | +3.2% (−6.7% vs SPY) |
| Mar 10, 2026 | Insider buy | Mehra Sanjeev K bought $1.0M | 0.0% (+0.2% vs SPY) | −6.9% (−5.5% vs SPY) | −1.9% (−1.8% vs SPY) |
| Feb 25, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.6% (0.0% vs SPY) | −4.6% (−3.5% vs SPY) | −16.6% (−9.7% vs SPY) |
| Feb 25, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.6% (0.0% vs SPY) | −4.6% (−3.5% vs SPY) | −16.6% (−9.7% vs SPY) |
| Feb 19, 2026 | Insider buy | Lucier Gregory T bought $458K | −0.7% (−0.4% vs SPY) | −2.3% (−3.3% vs SPY) | −19.7% (−15.8% vs SPY) |
| Feb 12, 2026 | Insider buy | Summe Gregory L bought $940K | −5.3% (−3.8% vs SPY) | −4.6% (−3.5% vs SPY) | −19.5% (−15.1% vs SPY) |
| Feb 11, 2026 | Earnings | Earnings: beat the EPS estimate by 1.5% | −14.6% (−14.6% vs SPY) | −18.6% (−17.7% vs SPY) | −34.6% (−30.7% vs SPY) |
| Dec 18, 2025 | 8-K | Directors and officers: departures, appointments, pay | −0.3% (−1.0% vs SPY) | +1.6% (−1.5% vs SPY) | +6.5% (+5.3% vs SPY) |
| Dec 4, 2025 | 8-K | Directors and officers: departures, appointments, pay | −2.0% (−2.2% vs SPY) | +2.8% (+2.1% vs SPY) | +9.6% (+8.2% vs SPY) |
| Nov 10, 2025 | 8-K | Directors and officers: departures, appointments, pay | 0.0% (−0.2% vs SPY) | −5.5% (−3.2% vs SPY) | +0.1% (−0.8% vs SPY) |
Insiders’ record here
In the year on the chart, Avantor's insiders reported 5 open-market buys ($2.7M) and 0 sales ($0). 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 +12.8% and after a sale —.
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% |
| 1.01 Material definitive agreement | 23,525 | 0.0% | 51% | +1.0% | ±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 → Avantor: 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.