ATRA SEC Form 4 filings
Atara Biotherapeutics, Inc. Latest Insider Trading Activity
Over the past 882 days, 12 insider trades from Atara Biotherapeutics, Inc. (ATRA). The most recent SEC Form 4 filing shows a sale by Nguyen Anhco (Atara Biotherapeutics, Inc. President and CEO) on May 18, 2026 involving 5,241 shares at $9.13 per share. This page shows up to the 10 most recent SEC Form 4 filing records on a 6-hour delay. Sign up for real-time updates and access to 20 years of historic insider trading data.
Insider Trading For ATRA Charted on Daily Candles. Scroll left or zoom out to load earlier candles (up to 2 years).
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| Ticker | Filing Date | Transaction Date | Company | Insider | Title | Transaction | Trade Count | Shares | Avg. Price | Total Value | Position Size Change | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2026-05-20 | 2026-05-18 | Atara Biotherapeutics, Inc. | Nguyen Anhco | President and CEO | Sell | 1 | 5,241 | $9.13 | $47,850.33 | 3.66% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2025-11-19 | 2025-11-17 | Atara Biotherapeutics, Inc. | Nguyen Anhco | President and CEO | Sell | 2 | 2,915 | $13.19 | $38,448.85 | 2.19% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. ATRA | 2025-07-21 | 2025-07-17 | Atara Biotherapeutics, Inc. | Huang James | Director,TenPercentOwner | Buy | 1 | 19,335 | $9.64 | $186,389.40 | 1.43% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2025-05-20 | 2025-05-16 | Atara Biotherapeutics, Inc. | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 1 | 2,218 | $6.76 | $14,993.68 | 5.65% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2024-11-20 | 2024-11-18 | Atara Biotherapeutics, Inc. | Henrich Jill | EVP, Chief Regulatory Officer | Sell | 1 | 1,000 | $11.20 | $11,200.00 | 4.91% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2024-11-20 | 2024-11-18 | Atara Biotherapeutics, Inc. | Hyllengren Eric J | EVP, CFO and COO | Sell | 1 | 1,364 | $11.20 | $15,276.80 | 5.51% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2024-11-20 | 2024-11-18 | Atara Biotherapeutics, Inc. | Nguyen Anhco | President and CEO | Sell | 1 | 1,664 | $11.20 | $18,636.80 | 2.10% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2024-08-20 | 2024-08-16 | Atara Biotherapeutics, Inc. | Hyllengren Eric J | EVP, CFO | Sell | 2 | 1,070 | $6.63 | $7,094.10 | 2.11% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2024-05-20 | 2024-05-16 | Atara Biotherapeutics, Inc. | Nguyen Anhco | EVP, Chief Sci. & Tech Officer | Sell | 1 | 42,899 | $0.62 | $26,597.38 | 4.56% | View Filing |
| Tax liability coverage transfers: shares are often sold to offset the tax liability from shares vesting ATRA | 2024-05-20 | 2024-05-16 | Atara Biotherapeutics, Inc. | Henrich Jill | EVP, Global Head RA & Quality | Sell | 1 | 25,750 | $0.62 | $15,965.00 | 4.64% | View Filing |
⚠️ THE SAMPLE ABOVE IS DEFERRED BY 6 HOURS ⚠️
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