Sponsel David Insider Trading Activity
Sponsel David has been net-selling over the last 12 months with 0 purchases and 7 sales across 1 company.
ATEC is the most-traded position with 7 trades. The largest single transaction was a sale of ATEC for $2.1M on Sep 18, 2025.
Performance Scorecard
Forward stock performance after each transaction by Sponsel David. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | — | -3.3% | 29% | 7 |
| 90 days | — | +12.0% | 67% | 6 |
| 120 days | — | +16.9% | 60% | 5 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersATEC · Alphatec Holdings, Inc.
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| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | ROLE |
|---|---|---|---|---|---|---|
| Mar 11, 2026 | ATEC | Sell | 163,452 | $12.52 | $2.0M | VP |
| Feb 5, 2026 | ATEC | Sell | 60,425 | $13.79 | $833K | VP |
| Dec 10, 2025 | ATEC | Sell | 21,106 | $20.79 | $439K | VP |
| Dec 8, 2025 | ATEC | Sell | 988 | $21.45 | $21K | VP |
| Oct 24, 2025 | ATEC | Sell | 70,000 | $16.18 | $1.1M | VP |
| Sep 19, 2025 | ATEC | Sell | 2,555 | $15.34 | $39K | VP |
| Sep 18, 2025 | ATEC | Sell | 137,445 | $15.09 | $2.1M | VP |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| ATEC | Alphatec Holdings, Inc. | 7 | $6.6M |
Other insiders at Alphatec Holdings, Inc.
9 other tracked filers at ATEC.
COO
11
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VP
9
Trades
GENERAL COUNSEL & CORP. SEC.
8
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Director
5
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CEO
5
Trades
10%+ Owner
4
Trades
10%+ Owner
4
Trades
10%+ Owner
4
Trades
Director
3
Trades