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Amentum Holdings stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions−2.6% to $21.25
Amentum Holdings (AMTM) stock fell 3% over the last 252 sessions, to $21.25. On the way it reported 4 quarters, its insiders filed no open-market trades (10b5-1 plan sales aside), and the company filed 2 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 2, 2026 | 8-K | Directors and officers: departures, appointments, pay | +0.6% (−0.1% vs SPY) | +6.1% (+5.0% vs SPY) | +21.4% (+23.7% vs SPY) |
| Aug 10, 2026 | Earnings | Earnings: beat the EPS estimate by 9.7% | −1.3% (−1.3% vs SPY) | −14.3% (−14.7% vs SPY) | −20.7% (−19.8% vs SPY) |
| May 11, 2026 | Earnings | Earnings: beat the EPS estimate by 6.8% | −2.4% (−2.7% vs SPY) | −6.5% (−6.7% vs SPY) | −8.6% (−8.5% vs SPY) |
| Apr 28, 2026 | 8-K | Material definitive agreement | −0.9% (−0.4% vs SPY) | −1.5% (−1.9% vs SPY) | −12.3% (−17.1% vs SPY) |
| Feb 9, 2026 | Earnings | Earnings: beat the EPS estimate by 4.4% | −2.5% (−3.0% vs SPY) | −19.1% (−17.8% vs SPY) | −26.5% (−24.5% vs SPY) |
| Nov 24, 2025 | Earnings | Earnings: beat the EPS estimate by 6.5% | +4.5% (+3.0% vs SPY) | +15.1% (+11.9% vs SPY) | +19.4% (+14.8% vs SPY) |
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 1.01 Material definitive agreement | 23,525 | 0.0% | 51% | +1.0% | ±1.4% |
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
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 → Amentum 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.