Updated Jul 16, 2026
HEIDEN WILLIAM K has filed 2 SEC Form 4 filings across 2 companies in the last 90 days — buying. Lifetime open-market purchases: $151K.
William K. Heiden is a corporate executive known for his role as a director at Macrogenics Inc and Atara Biotherapeutics, Inc. He has been involved in the biotechnology sector, particularly focusing on therapeutic developments for cancer treatment.
| Role | Insider |
|---|---|
| Notability | 20/100 |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-11 | ATRA | Atara Biotherapeutics, Inc. | A — Grant or award | 12.0K | $0.00 | |
| 2026-05-20 | MGNX | MACROGENICS INC | M — Option exercise | 3.8K | — | |
| 2025-08-19 | MGNX | MACROGENICS INC | P — Open-market purchase | 49.5K | $1.49 | $74K |
| 2025-08-19 | MGNX | MACROGENICS INC | P — Open-market purchase | 50.5K | $1.52 | $77K |
| 2025-06-10 | ATRA | Atara Biotherapeutics, Inc. | A — Grant or award | 7.8K | $0.00 | |
| 2025-05-20 | MGNX | MACROGENICS INC | M — Option exercise | 6.5K | — |
William K. Heiden is a corporate executive known for his role as a director at Macrogenics Inc and Atara Biotherapeutics, Inc. He has been involved in the biotechnology sector, particularly focusing on therapeutic developments for cancer treatment.…
2 primary Form 4 filings in the last 90 days, covering 2 companies.
Recorded transactions: 2 open-market purchases ($151K) and 0 open-market sales () across all tracked filings.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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