Ticker | Value | Shares | Price | Security | Type | Insider | Title | Return | Flags | Date |
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William K. Heiden currently holds 111,000 shares of Atara Biotherapeutics, Inc. (ATRA), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, William K. Heiden has been a net seller of ATRA stock. They have purchased $282.5K and sold $7.3M worth of shares.
William K. Heiden's most recent insider trade was on Aug 20, 2025, when they purchased 49,500 shares at $1.49 per share.
William K. Heiden serves as Executive at Atara Biotherapeutics, Inc. (ATRA). They have executed 65 insider transactions totaling $7.6M over their tenure at the company.
William K. Heiden holds the position of Executive at Atara Biotherapeutics, Inc., where they are responsible for executive-level decision-making and strategic oversight. They have been associated with the company for 14 years and currently hold a stake valued at $0.
William K. Heiden has shown a selling trading pattern, with $282.5K in total purchases and $7.3M in total sales across all transactions. Their most recent activity indicates a tendency to reduce their position.
The largest transaction by William K. Heiden was on Jul 15, 2015, when they sold $1.5M worth of AMAG shares. This transaction involved 20,000 shares at $75.00 per share.
William K. Heiden currently owns 111,000 shares of Atara Biotherapeutics, Inc. (ATRA), with an estimated value of $0. This stake represents their equity holdings accumulated through purchases, awards, and option exercises.
All of William K. Heiden's SEC Form 4 insider trading filings are tracked on this page. Each transaction links directly to the official SEC EDGAR filing. William K. Heiden has 65 Form 4 filings on record as an insider at Atara Biotherapeutics, Inc..
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