HEIDEN WILLIAM K (CIK 1214939) reported 6 SEC Form 4 insider transactions across 2 companies over the past 18 months (most recent 2026-06-11). Recent activity: Buy ATRA (12,000 shares), Buy MGNX (3,750 shares), Buy MGNX (50,500 shares), Buy MGNX (49,500 shares), Buy ATRA (7,828 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-11 | Atara Biotherapeutics, Inc. (ATRA) | Director | Buy | 12,000 | $0 |
| 2026-05-20 | MACROGENICS INC (MGNX) | Director | Buy | 3,750 | $0 |
| 2025-08-21 | MACROGENICS INC (MGNX) | Director | Buy | 50,500 | $76,760 |
| 2025-08-21 | MACROGENICS INC (MGNX) | Director | Buy | 49,500 | $73,755 |
| 2025-06-12 | Atara Biotherapeutics, Inc. (ATRA) | Director | Buy | 7,828 | $0 |
| 2025-05-22 | MACROGENICS INC (MGNX) | Director | Buy | 6,500 | $0 |
Source: SEC Form 4 filings · as of 2026-06-11