ATRAHealthcareMicro-Cap
Atara Biotherapeutics, Inc. Insider Trading Activity
Every SEC Form 4 insider transaction reported for Atara Biotherapeutics, Inc. (ATRA), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Quick Answer
Are ATRA insiders buying or selling?
Atara Biotherapeutics, Inc. insiders reported 10 open-market buys ($6.5M) and 211 sells ($47.6M) across 221 Form 4 filings — a net selling position of $41.1M.
Source: SEC EDGAR Form 4
Key Statistics (as of Aug 26, 2026)
Total Form 4 filings
221
SEC EDGAR
Insider filers
25
Insider buys (10)
$6.5M
Insider sells (211)
$47.6M
Insider sentiment
Net sellingNet insider flow of $41.1M in net selling.
Recent ATRA insider transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 26, 2026 | Anhco Nguyen | President and CEO | Sale | 5.1K | $8.08 | $40.9K |
| May 20, 2026 | Anhco Nguyen | President and CEO | Sale | 5.2K | $9.13 | $47.8K |
| May 20, 2026 | Yanina Grant-Huerta | Chief Accounting Officer | Sale | 2.4K | $9.13 | $22.0K |
| May 11, 2026 | Panacea Innovation Ltd | 10% Owner | Sale | 313.4K | $10.10 | $3.2M |
| May 11, 2026 | EcoR1 Capital, LLC | 10% Owner | Purchase | 507.4K | $9.35 | $4.7M |
| Mar 4, 2026 | Yanina Grant-Huerta | Chief Accounting Officer | Sale | 2.1K | $5.08 | $10.7K |
| Mar 4, 2026 | Anhco Nguyen | President and CEO | Sale | 3.0K | $5.09 | $15.2K |
| Jan 15, 2026 | Panacea Innovation Ltd | 10% Owner | Sale | 80.6K | $6.07 | $489.0K |
| Nov 19, 2025 | Anhco Nguyen | President and CEO | Sale | 2.9K | $13.19 | $38.4K |
| Nov 19, 2025 | Yanina Grant-Huerta | Chief Accounting Officer | Sale | 1.8K | $13.19 | $23.8K |
| Aug 20, 2025 | Panacea Innovation Ltd | 10% Owner | Purchase | 55.0K | $12.19 | $670.4K |
| Jul 21, 2025 | Panacea Innovation Ltd | 10% Owner | Purchase | 19.3K | $9.64 | $186.4K |
| May 20, 2025 | Yanina Grant-Huerta | Chief Accounting Officer | Sale | 2.2K | $6.76 | $15.0K |
| May 20, 2025 | Anhco Nguyen | President and CEO | Sale | 3.3K | $6.76 | $22.2K |
| Mar 5, 2025 | Anhco Nguyen | President and CEO | Sale | 3.3K | $7.00 | $23.3K |
| Mar 5, 2025 | Eric J Hyllengren | EVP, CFO and COO | Sale | 1.2K | $7.00 | $8.5K |
| Mar 5, 2025 | Jill Henrich | EVP, Chief Regulatory Officer | Sale | 1.1K | $7.00 | $7.4K |
| Nov 20, 2024 | Jill Henrich | EVP, Chief Regulatory Officer | Sale | 1.0K | $11.20 | $11.2K |
| Nov 20, 2024 | Eric J Hyllengren | EVP, CFO and COO | Sale | 1.4K | $11.20 | $15.3K |
| Nov 20, 2024 | Anhco Nguyen | President and CEO | Sale | 1.7K | $11.20 | $18.6K |
| Aug 20, 2024 | Pascal Touchon | President and CEO | Sale | 3.0K | $6.63 | $20.1K |
| Aug 20, 2024 | Anhco Nguyen | EVP, Chief Sci. & Tech Officer | Sale | 1.8K | $6.63 | $12.1K |
| Aug 20, 2024 | Amar Murugan | EVP, Chief Legal Officer | Sale | 1.2K | $6.63 | $7.7K |
| Aug 20, 2024 | Eric J Hyllengren | EVP, CFO | Sale | 1.1K | $6.63 | $7.1K |
| Aug 20, 2024 | Jill Henrich | EVP, Global Head RA & Quality | Sale | 963 | $6.63 | $6.4K |
Showing the 25 most recent of 221 Form 4 filings for Atara Biotherapeutics, Inc..
Most active ATRA insiders
- Isaac E. Ciechanover41 filings
- Joe Newell34 filings
- Pascal Touchon22 filings
- Utpal Koppikar22 filings
- Amar Murugan14 filings
Ask anything about ATRA insider activity
Use Trabud's AI agent to query Atara Biotherapeutics, Inc.'s Form 4 history in plain English — "Show me ATRA CEO purchases this year" or compare it against any other ticker.
Open the AI agentATRA insider trading FAQ
Are Atara Biotherapeutics, Inc. insiders buying or selling?
Across 221 SEC Form 4 filings, Atara Biotherapeutics, Inc. (ATRA) insiders reported 10 open-market purchases totaling $6.5M and 211 sales totaling $47.6M. That is a net selling position of $41.1M.
How many insiders trade ATRA stock?
25 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for Atara Biotherapeutics, Inc.. The most recent filing was accepted on Aug 26, 2026.
Where does Trabud get ATRA insider trading data?
All ATRA insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.
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