Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies William K. Heiden files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- EcoR1 Capital, LLC - $4.74M in ATRA purchases and sales in the last 12 months
- Panacea Innovation Ltd - $3.65M in ATRA purchases and sales in the last 12 months
- Brian N. Cherry - $1000K in ATRA purchases and sales in the last 12 months
- Anhco Nguyen - $142K in ATRA purchases and sales in the last 12 months
- Jeffrey Stuart Peters - $129K in MGNX purchases and sales in the last 12 months
- Yanina Grant-Huerta - $57K in ATRA purchases and sales in the last 12 months
More insiders (A-Z)
Browse nearby insider profiles in alphabetical order.
Frequently asked questions
Who is William K. Heiden?
William K. Heiden is a corporate insider of Atara Biotherapeutics, Inc. (ATRA). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did William K. Heiden last file a Form 4?
The most recent primary Form 4 on record is dated 11 June 2026, one of 5 filings going back to 2025.
Has William K. Heiden been buying or selling stock?
Recorded transactions: 2 open-market purchases ($151K) and 0 open-market sales across all tracked filings.
