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Alphatec Holdings stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions−61.9% to $7.44
Alphatec Holdings (ATEC) stock fell 62% over the last 252 sessions, to $7.44. On the way it reported 4 quarters, its insiders filed 28 open-market trades and 1 Form 144 notice of planned sales, and the company filed 3 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 29, 2026 | Earnings | Earnings: missed the EPS estimate by -2.0% | −0.7% (−0.3% vs SPY) | −32.4% (−31.7% vs SPY) | — |
| Sep 10, 2026 | Insider buy | Miles Patrick bought $1.0M | −1.7% (−1.1% vs SPY) | +15.5% (+16.6% vs SPY) | +14.1% (+12.3% vs SPY) |
| Aug 5, 2026 | Form 144 | Form 144: Tyson Marshall plans to sell $85K | −7.8% (−7.6% vs SPY) | −9.9% (−9.9% vs SPY) | −11.9% (−11.1% vs SPY) |
| Aug 4, 2026 | Earnings | Earnings: beat the EPS estimate by 1.3% | +1.9% (+0.2% vs SPY) | −6.7% (−8.7% vs SPY) | −9.7% (−10.3% vs SPY) |
| Jun 11, 2026 | 8-K | Directors and officers: departures, appointments, pay | +1.8% (+1.3% vs SPY) | +8.0% (+6.6% vs SPY) | +9.8% (+7.7% vs SPY) |
| May 11, 2026 | Insider buy | Valentine Keith bought $245K | −7.3% (−7.5% vs SPY) | +1.8% (+1.6% vs SPY) | +9.4% (+9.4% vs SPY) |
| May 8, 2026 | Insider buy | Valentine Keith bought $331K | −3.0% (−3.8% vs SPY) | −2.4% (−4.6% vs SPY) | +2.0% (+1.0% vs SPY) |
| May 7, 2026 | Insider buy | Valentine Keith bought $421K | +10.3% (+10.6% vs SPY) | +7.7% (+6.6% vs SPY) | +13.5% (+13.0% vs SPY) |
| May 5, 2026 | 8-K | Material definitive agreement | −38.1% (−39.5% vs SPY) | −27.9% (−29.9% vs SPY) | −25.6% (−30.1% vs SPY) |
| May 5, 2026 | Earnings | Earnings: beat the EPS estimate by 100.0% | −1.0% (−1.8% vs SPY) | −39.1% (−42.0% vs SPY) | −29.7% (−34.6% vs SPY) |
| Mar 13, 2026 | Insider sale | Lish Scott sold $3.2M | −1.8% (−1.2% vs SPY) | +1.7% (+2.7% vs SPY) | −10.5% (−13.8% vs SPY) |
| Mar 3, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.2% (−0.9% vs SPY) | −4.0% (−3.5% vs SPY) | −14.5% (−11.0% vs SPY) |
| Feb 24, 2026 | Earnings | Earnings: beat the EPS estimate by 44.9% | +5.7% (+5.0% vs SPY) | +2.3% (+1.8% vs SPY) | −11.3% (−7.2% vs SPY) |
| Dec 16, 2025 | Insider sale | Pelizzon David R sold $4.9M | +0.2% (+0.5% vs SPY) | +4.9% (+4.0% vs SPY) | −12.1% (−14.1% vs SPY) |
| Dec 11, 2025 | Insider sale | Demski David M sold $636K | −4.8% (−5.1% vs SPY) | −6.6% (−4.2% vs SPY) | −17.2% (−18.6% vs SPY) |
| Dec 10, 2025 | Insider sale | Hunsaker Craig E sold $679K | +1.1% (+0.4% vs SPY) | −4.5% (−3.9% vs SPY) | +9.1% (+7.3% vs SPY) |
| Dec 9, 2025 | Insider sale | Squadron Capital LLC sold $606K | −1.4% (−1.3% vs SPY) | −6.1% (−5.7% vs SPY) | +7.9% (+6.8% vs SPY) |
| Dec 9, 2025 | Insider sale | Squadron Capital Holdings LLC sold $606K | −1.4% (−1.3% vs SPY) | −6.1% (−5.7% vs SPY) | +7.9% (+6.8% vs SPY) |
| Dec 9, 2025 | Insider sale | Pritzker Jennifer N. sold $606K | −1.4% (−1.3% vs SPY) | −6.1% (−5.7% vs SPY) | +7.9% (+6.8% vs SPY) |
| Dec 9, 2025 | Insider sale | Pelizzon David R sold $606K | −1.4% (−1.3% vs SPY) | −6.1% (−5.7% vs SPY) | +7.9% (+6.8% vs SPY) |
| Dec 8, 2025 | Insider sale | Squadron Capital LLC sold $4.7M | −2.3% (−2.0% vs SPY) | −7.2% (−6.6% vs SPY) | +2.4% (+1.6% vs SPY) |
| Dec 8, 2025 | Insider sale | Squadron Capital Holdings LLC sold $4.7M | −2.3% (−2.0% vs SPY) | −7.2% (−6.6% vs SPY) | +2.4% (+1.6% vs SPY) |
| Dec 8, 2025 | Insider sale | Sponsel David sold $21K | −2.3% (−2.0% vs SPY) | −7.2% (−6.6% vs SPY) | +2.4% (+1.6% vs SPY) |
| Dec 8, 2025 | Insider sale | Pritzker Jennifer N. sold $4.7M | −2.3% (−2.0% vs SPY) | −7.2% (−6.6% vs SPY) | +2.4% (+1.6% vs SPY) |
| Dec 8, 2025 | Insider sale | Pelizzon David R sold $4.7M | −2.3% (−2.0% vs SPY) | −7.2% (−6.6% vs SPY) | +2.4% (+1.6% vs SPY) |
| Dec 5, 2025 | Insider sale | Lish Scott sold $233K | +0.8% (+0.6% vs SPY) | −6.6% (−7.3% vs SPY) | +2.4% (+1.0% vs SPY) |
| Nov 24, 2025 | Insider sale | Squadron Capital LLC sold $5.2M | +1.6% (+0.1% vs SPY) | +7.8% (+4.6% vs SPY) | +3.3% (−1.2% vs SPY) |
| Nov 24, 2025 | Insider sale | Squadron Capital Holdings LLC sold $5.2M | +1.6% (+0.1% vs SPY) | +7.8% (+4.6% vs SPY) | +3.3% (−1.2% vs SPY) |
| Nov 24, 2025 | Insider sale | Pritzker Jennifer N. sold $5.2M | +1.6% (+0.1% vs SPY) | +7.8% (+4.6% vs SPY) | +3.3% (−1.2% vs SPY) |
| Nov 24, 2025 | Insider sale | Pelizzon David R sold $5.2M | +1.6% (+0.1% vs SPY) | +7.8% (+4.6% vs SPY) | +3.3% (−1.2% vs SPY) |
| Nov 20, 2025 | Insider sale | Marshall Tyson Eliot sold $1.4M | 0.0% (+1.5% vs SPY) | +14.1% (+11.6% vs SPY) | +2.0% (−1.0% vs SPY) |
| Nov 20, 2025 | Insider sale | Lish Scott sold $495K | 0.0% (+1.5% vs SPY) | +14.1% (+11.6% vs SPY) | +2.0% (−1.0% vs SPY) |
| Nov 12, 2025 | Insider sale | Squadron Capital LLC sold $5.2M | +0.1% (+0.1% vs SPY) | −3.9% (−0.5% vs SPY) | −4.0% (−4.9% vs SPY) |
| Nov 12, 2025 | Insider sale | Squadron Capital Holdings LLC sold $5.2M | +0.1% (+0.1% vs SPY) | −3.9% (−0.5% vs SPY) | −4.0% (−4.9% vs SPY) |
| Nov 12, 2025 | Insider sale | Pritzker Jennifer N. sold $5.2M | +0.1% (+0.1% vs SPY) | −3.9% (−0.5% vs SPY) | −4.0% (−4.9% vs SPY) |
| Nov 12, 2025 | Insider sale | Pelizzon David R sold $5.2M | +0.1% (+0.1% vs SPY) | −3.9% (−0.5% vs SPY) | −4.0% (−4.9% vs SPY) |
Insiders’ record here
In the year on the chart, Alphatec Holdings' insiders reported 4 open-market buys ($2.0M) and 24 sales ($74.2M). Of the 27 old enough to score, 27 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 +21.4% and after a sale −35.4%.
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% |
| 1.02 Termination of a material agreement | 2,368 | 0.0% | 51% | +1.1% | ±1.5% |
| 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 → Alphatec 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.