David Sponsel is VP at Alphatec Holdings, Inc. (ATEC). They have made 12 open-market trades across 1 company since 2020, most recently 2026-03-11.
CIK 0001772837
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.
1 open-market purchase totalling $50K since 2020, against 11 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ATEC | 504,932 | $5.3M |
Shares reported on the most recent Form 4, priced at the 2026-03-13 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ATEC | SELL | 2026-03-11 | 2026-03-13 | $12.52 | $2.0M | -6.9% | -8.9% | -34.0% |
| ATEC | SELL · 10b5-1 | 2026-02-05 | 2026-02-06 | $13.79 | $833K | -2.6% | -7.0% | -44.0% |
| ATEC | SELL · 10b5-1 | 2025-12-10 | 2025-12-12 | $20.79 | $878K | +4.6% | -11.4% | -37.1% |
| ATEC | SELL | 2025-12-08 | 2025-12-10 | $21.45 | $21K | -2.4% | +6.8% | -41.0% |
| ATEC | SELL · 10b5-1 | 2025-10-24 | 2025-10-28 | $16.18 | $1.1M | +19.3% | +35.9% | -5.5% |
| ATEC | SELL · 10b5-1 | 2025-09-18 | 2025-09-19 | $15.09 | $4.2M | -9.9% | +0.0% | +28.2% |
| ATEC | SELL · 10b5-1 | 2025-03-06 | 2025-03-10 | $10.83 | $731K | +4.4% | +2.9% | +22.0% |
| ATEC | SELL · 10b5-1 | 2025-02-24 | 2025-02-26 | $10.54 | $682K | -7.9% | -3.0% | +17.3% |
| ATEC | SELL · 10b5-1 | 2025-02-03 | 2025-02-04 | $11.42 | $828K | -11.7% | -11.2% | -1.5% |
| ATEC | SELL · 10b5-1 | 2025-01-10 | 2025-01-14 | $10.71 | $1.3M | -1.6% | -3.8% | -10.0% |
| ATEC | SELL · 10b5-1 | 2024-12-11 | 2024-12-13 | $9.69 | $1.2M | -2.8% | +13.3% | -3.4% |
| ATEC | SELL · 10b5-1 | 2024-02-27 | 2024-02-29 | $15.19 | $983K | -1.0% | +3.7% | -24.0% |
| ATEC | SELL · 10b5-1 | 2024-02-21 | 2024-02-22 | $15.34 | $547K | -13.1% | -10.2% | -29.0% |
| ATEC | SELL · 10b5-1 | 2024-02-14 | 2024-02-15 | $16.16 | $40K | -9.6% | -12.6% | -25.8% |
| ATEC | SELL · 10b5-1 | 2024-02-02 | 2024-02-05 | $16.47 | $1.2M | -4.5% | -20.5% | -18.9% |
| ATEC | SELL · 10b5-1 | 2024-01-16 | 2024-01-17 | $15.00 | $38K | +9.1% | +1.6% | -13.7% |
| ATEC | SELL · 10b5-1 | 2023-12-21 | 2023-12-26 | $15.00 | $38K | -2.3% | +5.1% | -11.3% |
| ATEC | SELL · 10b5-1 | 2023-06-15 | 2023-06-20 | $16.17 | $1.8M | +15.8% | +14.4% | -13.0% |
| ATEC | SELL | 2023-03-06 | 2023-03-08 | $15.82 | $532K | -4.7% | -0.8% | -4.5% |
| ATEC | SELL | 2023-01-09 | 2023-01-10 | $11.99 | $120K | +10.0% | +17.2% | +33.4% |
| ATEC | SELL | 2022-12-05 | 2022-12-05 | $9.88 | $198K | +11.4% | +23.6% | +61.1% |
| ATEC | SELL | 2022-11-07 | 2022-11-09 | $9.25 | $93K | +1.0% | +1.5% | +40.7% |
| ATEC | SELL | 2021-11-12 | 2021-11-15 | $11.56 | $228K | -12.7% | -7.5% | -16.4% |
| ATEC | SELL | 2021-06-16 | 2021-06-21 | $14.78 | $148K | -4.1% | -8.5% | -12.6% |
| ATEC | SELL | 2021-05-03 | 2021-05-04 | $15.97 | $479K | -4.8% | -9.8% | -4.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.