Insiders / Heiden William K
Heiden William K
CIK 1214939personinsider
Companies
2
First seen
May 20, 2026
Last activity
Jun 11, 2026
Companies
| Company | Shares held | Latest |
|---|---|---|
| MacroGenics, Inc. · MGNX | 114,750 | — |
| Atara Biotherapeutics, Inc. · ATRA | 34,188 | — |
All securities held
4 positions · latest reported per filing
| Company | Security | Shares |
|---|---|---|
| Atara Biotherapeutics, Inc. | Common Stock | 34,188 |
| MacroGenics, Inc. | Common Stock | 114,750 |
| MacroGenics, Inc. | Stock Option (right to buy)Derivative | 22,000 |
| MacroGenics, Inc. | Restricted Stock UnitDerivative | 3,750 |
Activity
InsidersInstitutions
This person's insider trades (Form 4), across every company.| Date | Action | Company | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|
| Jun 9, 2026 | Grant | ATRA Atara Biotherapeutics, Inc. Common Stock | $0 | +12K +54.08% | 34,188 0.34% of shares | low |
| May 19, 2026 | Grant | MGNX MacroGenics, Inc. Stock Option (right to buy) | — | +22K | 22,000 0.03% of shares | low |
| May 19, 2026 | Grant | MGNX MacroGenics, Inc. Restricted Stock Unit | — | +4K | 3,750 <0.01% of shares | low |
| May 18, 2026 | Exercise | MGNX MacroGenics, Inc. Restricted Stock Unit | — | -4K -100.00% | 0 0.00% of shares | low |
| May 18, 2026 | Exercise | MGNX MacroGenics, Inc. Common Stock | — | +4K +3.38% | 114,750 0.18% of shares | low |