David R. Pelizzon is Director & 10% Owner at Alphatec Holdings, Inc. (ATEC). They have made 21 open-market trades across 2 companies since 2017, most recently 2026-09-10.
CIK 0001719217
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.
13 open-market purchases totalling $190.3M since 2017, against 8 sales. Across 13 scored buys the stock is up 10.9% at ninety days, and 5.9 points ahead of the S&P over the same stretch.
13 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| KIDS | 6,201,764 | $136.1M |
| ATEC | 378,839 | $4.0M |
| Total | $140.1M |
Shares reported on the most recent Form 4, priced at the 2026-09-10 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 54% | 69% | 54% |
| Avg Move | +3.3% | +2.9% | +10.9% |
| Alpha | +3.2% | +0.7% | +5.9% |
| Scored | 13 | 13 | 13 |
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 71% | 43% | — |
| Avg Move | +0.3% | -0.4% | — |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| KIDS | SELL | 2026-09-10 | 2026-09-10 | $21.01 | $6.4M | +3.7% | +0.9% | — |
| KIDS | SELL | 2026-09-02 | 2026-09-04 | $23.35 | $525K | -0.4% | +4.5% | — |
| KIDS | SELL | 2026-08-28 | 2026-09-01 | $23.04 | $7.8M | -3.3% | -6.3% | — |
| KIDS | SELL | 2026-08-24 | 2026-08-26 | $24.63 | $943K | -6.5% | -5.0% | — |
| ATEC | SELL | 2025-12-16 | 2025-12-18 | $19.66 | $4.9M | +5.9% | -13.7% | -36.8% |
| ATEC | SELL | 2025-12-08 | 2025-12-10 | $21.18 | $10.6M | -2.4% | +6.8% | -41.0% |
| ATEC | SELL | 2025-11-24 | 2025-11-25 | $20.62 | $5.2M | -4.6% | -4.5% | -40.1% |
| ATEC | SELL | 2025-11-12 | 2025-11-14 | $20.80 | $5.2M | +15.7% | +1.0% | -32.9% |
| ATEC | BUY | 2024-08-22 | 2024-08-26 | $5.84 | $250K | +6.2% | -8.1% | +59.3% |
| ATEC | BUY | 2023-03-13 | 2023-03-15 | $15.24 | $47K | +5.8% | +3.7% | +4.3% |
| KIDS | BUY | 2021-11-11 | 2021-11-12 | $66.48 | $55K | -5.3% | -13.6% | -25.3% |
| ATEC | BUY | 2021-11-11 | 2021-11-15 | $11.41 | $50K | -12.7% | -7.5% | -16.4% |
| ATEC | BUY | 2021-11-08 | 2021-11-10 | $13.00 | $71K | -1.8% | +2.1% | -7.4% |
| ATEC | BUY | 2021-05-10 | 2021-05-12 | $15.25 | $1.8M | +7.2% | +0.9% | -3.4% |
| KIDS | BUY | 2021-03-15 | 2021-03-17 | $46.50 | $172K | -4.8% | +6.2% | +30.9% |
| ATEC | BUY | 2021-03-08 | 2021-03-10 | $15.53 | $135K | +12.3% | +5.3% | -15.2% |
| ATEC | BUY | 2021-03-01 | 2021-03-03 | $11.11 | $180.0M | +0.2% | -10.1% | -14.9% |
| ATEC | BUY | 2020-10-16 | 2021-01-26 | $8.75 | $7.5M | +12.1% | +11.2% | +16.6% |
| KIDS | BUY | 2018-05-22 | 2018-05-24 | $19.50 | $39K | +34.0% | +37.6% | +58.7% |
| KIDS | BUY | 2018-03-12 | 2018-03-13 | $17.50 | $18K | -8.1% | +2.7% | +48.5% |
| KIDS | BUY | 2017-10-16 | 2017-10-16 | $13.00 | $130K | -1.6% | +7.1% | +5.4% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| Scored | 7 | 7 | 3 |