Quick Takeaways
- William K. Heiden has 2 issuer positions tracked on this page.
- Estimated disclosed ownership value: $500,606.
- Recent insider filing activity is available below.
Insider Trading & Ownership of William K. Heiden
- Location
- Waltham, MA
- Summary
- The estimated net worth of William K. Heiden is at least $500,606 dollars as of 21 Aug 2025. William K. Heiden is the Director of MACROGENICS INC and owns shares of MACROGENICS INC (MGNX) stock worth about $332.9K. William K. Heiden is the Director of Atara Biotherapeutics, Inc. and owns shares of Atara Biotherapeutics, Inc. (ATRA) stock worth about $167.7K.
- Signature
- /s/ Beth A. Smith, Attorney-in-fact
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow William K. Heiden and return when a new Insider Trading filing changes the record on this page.
This uses the existing product follow flow to surface future filing-backed changes without guessing what they mean.
What Changed
- Largest disclosed position: MACROGENICS INC ($332,865).
- Past-year value change for that position: +$150,515.
Why This Matters
- This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
- You can cross-check role, issuer, and filing chronology directly against the SEC source.
Source Evidence
Filed on Form 4
See Original Filing
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
Ownership of William K. Heiden
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| MGNX | MACROGENICS INC | Director | $332,865 | +$150,515 | +83% | 19 Aug 2025 |
| ATRA | Atara Biotherapeutics, Inc. | Director | $167,741 | 10 Jun 2025 |
Insider Transactions Reported by William K. Heiden:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.