Ticker | Value | Shares | Price | Security | Type | Insider | Title | Return | Flags | Date |
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Beth C. Seidenberg currently holds 39,567 shares of Atara Biotherapeutics, Inc. (ATRA), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Beth C. Seidenberg has been a net buyer of ATRA stock. They have purchased $83.7M and sold $15.2M worth of shares.
Beth C. Seidenberg's most recent insider trade was on Jun 12, 2026, when they sold 39,567 shares at $0.00 per share.
Beth C. Seidenberg serves as Executive at Atara Biotherapeutics, Inc. (ATRA). They have executed 180 insider transactions totaling $98.9M over their tenure at the company.
Beth C. Seidenberg 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 20 years and currently hold a stake valued at $0.
Beth C. Seidenberg has shown a buying trading pattern, with $83.7M in total purchases and $15.2M in total sales across all transactions. Their most recent activity indicates a tendency to accumulate shares.
The largest transaction by Beth C. Seidenberg was on May 9, 2023, when they purchased $22.5M worth of SLRN shares. This transaction involved 1,250,000 shares at $18.00 per share.
Beth C. Seidenberg currently owns 39,567 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 Beth C. Seidenberg's SEC Form 4 insider trading filings are tracked on this page. Each transaction links directly to the official SEC EDGAR filing. Beth C. Seidenberg has 180 Form 4 filings on record as an insider at Atara Biotherapeutics, Inc..
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