Atara Biotherapeutics, Inc.
Atara Biotherapeutics, Inc. (ATRA) is a publicly traded company in the Unknown sector. Across all available filings, 39 corporate insiders have executed 1016 transactions totaling $69.3M, demonstrating a bearish sentiment with -$55.8M in net insider flow. The most recent transaction on Jan 12, 2026 involved a sale of 80,554 shares valued at $489.0K.
ATRA Insider Activity Summary
Who Is Buying ATRA Stock?
No significant insider buying has been recorded for ATRA in the recent period.
Who Is Selling ATRA Stock?
No significant insider selling has been recorded for ATRA in the recent period.
Is Atara Biotherapeutics, Inc. Insider Trading Bullish or Bearish?
Based on recent SEC filings, insider sentiment for ATRA is bearish with an Insider Alignment Score of 10/100 and a net flow of -$55.8M. Insiders are reducing their positions, though this can be driven by factors unrelated to company outlook.
ATRA Frequently Asked Questions
Understanding ATRA Insider Activity
Insider trading at Atara Biotherapeutics, Inc. (ATRA) refers to stock transactions made by corporate insiders—executives, directors, and beneficial owners holding more than 10% of the company's shares. These individuals have access to material non-public information and are required by law to report their trades to the SEC within two business days. Currently, 39 insiders are actively trading ATRA stock, having executed 1016 transactions in the past 90 days. The most active insider is Isaac E. Ciechanover (Executive), who has made 350 transactions totaling $31.1M.
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Track Atara Biotherapeutics, Inc. Insider Activity
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