HEIDEN WILLIAM K
SEC CIK 1214939 · EDGAR
BoughtSold
Most active insiders at ATRA, 12 months
| # | Insider | Title | Bought | Sold |
|---|---|---|---|---|
| 1 | EcoR1 Capital, LLC | 10% | $4.74M | — |
| 2 | Panacea Innovation Ltd | 10% | — | $3.17M |
| 3 | Cherry Brian N | Dir | $1000.0K | — |
| 4 | Huang James | Dir, 10% | — | $489.0K |
| 5 | Nguyen AnhCo | Pres, CEO, Dir | — | $142.4K |
| 6 | Grant-Huerta Yanina | CAO | — | $56.5K |
| 7 | Ciongoli Gregory Austin | Dir, 10%, See Remarks | — | — |
| 8 | Redmile Group, LLC | Dir | — | — |
| 9 | Fust Matthew K | Dir | — | — |
| 10 | HEIDEN WILLIAM K | Dir | — | — |
Transactions 10
| X | Filed | Traded | Ticker | Company | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-06-11 16:37 | 2026-06-09 | ATRA | Atara Biotherapeutics, Inc. | HEIDEN WILLIAM K | Dir | A - Grant | $0.00 | +12.0K | 34.2K | +54% | $0 | |
| D | 2026-05-20 16:14 | 2026-05-18 | MGNX | MACROGENICS INC | HEIDEN WILLIAM K | Dir | M - OptEx | — | +3,750 | 114.8K | +3% | — |
| M | 2025-08-21 | 2025-08-19+ | MGNX | MACROGENICS INC | HEIDEN WILLIAM K | Dir | P - Purchase | $1.51 | +100.0K | 61.5K | New | +$150.5K |
| 2025-06-12 | 2025-06-10 | ATRA | Atara Biotherapeutics, Inc. | HEIDEN WILLIAM K | Dir | A - Grant | $0.00 | +7,828 | 22.2K | +55% | $0 | |
| D | 2025-05-22 | 2025-05-20 | MGNX | MACROGENICS INC | HEIDEN WILLIAM K | Dir | M - OptEx | — | +6,500 | 11.0K | +144% | — |
| D | 2024-05-22 | 2024-05-20 | MGNX | MACROGENICS INC | HEIDEN WILLIAM K | Dir | M - OptEx | $0.00 | +4,500 | 4,500 | New | $0 |
| 2024-04-02 | 2024-03-31 | ATRA | Atara Biotherapeutics, Inc. | HEIDEN WILLIAM K | Dir | A - Grant | $0.00 | +150.0K | 359.0K | +72% | $0 | |
| 2023-11-14 | 2023-11-10 | ATRA | Atara Biotherapeutics, Inc. | HEIDEN WILLIAM K | Dir | P - Purchase | $0.25 | +100.0K | 209.0K | +92% | +$25.0K | |
| D | 2023-06-02 | 2023-05-31 | ATRA | Atara Biotherapeutics, Inc. | HEIDEN WILLIAM K | Dir | A - Grant | $0.00 | +57.0K | 109.0K | +110% | $0 |
| D | 2022-06-27 | 2022-06-23 | ATRA | Atara Biotherapeutics, Inc. | HEIDEN WILLIAM K | Dir | A - Grant | $0.00 | +20.5K | 52.0K | +65% | $0 |
Purchase Sale Sale after option exercise All abbreviations