Heiden William K
- SEC CIK
- 0001214939
No open-market purchases or sales filed in the past year.
Current role at each company
- ATRA Atara Biotherapeutics, Inc.Directoras of Jun 11, 2026
- MGNX Macrogenics IncDirectoras of May 20, 2026
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- –
- 0 filings
- Sold
- –
- 0 filings
- Net
- –
- Bought minus sold
- Companies
- 0
- With open-market trades
Trades
Every Form 4 that lists Heiden William K as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
MGNX Macrogenics Inc
Director1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 21, 2025 (view filing) | Aug 19-20 | 2 days | Heiden William KDirector | PPurchase | +100.0K | $1.51 | +$150.5K | +909.1%111.0K after | 2 lots |
ATRA Atara Biotherapeutics, Inc.
Director1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Nov 14, 2023 (view filing)6:29 PM ET | Nov 10 | 4 days | Heiden William KDirector | PPurchase | +100.0K | $0.2533 | +$25.3K | +91.7%209.0K after |