Demski David M (CIK 1555392) reported 4 SEC Form 4 insider transactions across 2 companies over the past 18 months (most recent 2026-06-12). Recent activity: Buy ATEC (32,012 shares), Sell ATEC (30,000 shares), Buy ATEC (15,131 shares), Sell FNA (74,307 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-12 | Alphatec Holdings, Inc. (ATEC) | Director | Buy | 32,012 | $0 |
| 2025-12-12 | Alphatec Holdings, Inc. (ATEC) | Director | Sell | 30,000 | $636,000 |
| 2025-06-13 | Alphatec Holdings, Inc. (ATEC) | Director | Buy | 15,131 | $0 |
| 2025-04-21 | Paragon 28, Inc. (FNA) | Director | Sell | 74,307 | $0 |
Source: SEC Form 4 filings · as of 2026-06-12