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Atara Biotherapeutics, Inc. (NASDAQ:ATRA)
US · Delayed Price · Currency is USD
Also listed: 0HIY.LHealthcare · Biotechnology
8.35-0.24 (-2.79%)
Market cap
$83.8M
Insider Score
Health Score
Analyst consensus
Listed since
Oct 16, 2014
Website
Insider Score
/ 100
ATRA Insider Score
Atara Biotherapeutics, Inc. has a live Insider Score.
Scored on 1 qualifying trade from 1 insider in the last 90 days.
ATRA Stock Insider Trading Activity
ATRA stock’s insider trading shows 2 purchases for an estimated $5.74M and 4 sales on the open market for an estimated $3.28M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days1 qualifying buy1 insider$999.99K bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Cherry Brian N Director | Buy | 104,166 | $9.60 | $999.99K | 167% | 166,486 | Sep 4, 2026 | AFirst BuyStake DoublerDilution | Form 4 |
| Nguyen AnhCo CEO | Sell | 5,062 | $8.08 | $40.88K | 3.7% | 132,775 | Aug 17, 2026 | — | Form 4 |
| Redmile Group, LLC Director | Option exercise | 195,211 | — | — | 44.2% | 636,912 | Jul 22, 2026 | — | Form 4 |
| Redmile Group, LLC Director | Tax withheld | 60 | — | — | 0.0% | 636,852 | Jul 22, 2026 | — | Form 4 |
| Cherry Brian N Director | Award | 24,000 | — | — | 62.6% | 62,320 | Jun 11, 2026 | — | Form 4 |
| Fust Matthew K Director | Award | 12,000 | — | — | 66.0% | 30,188 | Jun 9, 2026 | — | Form 4 |
| HEIDEN WILLIAM K Director | Award | 12,000 | — | — | 54.1% | 34,188 | Jun 9, 2026 | — | Form 4 |
| Ciongoli Gregory Austin Director | Award | 12,000 | — | — | New | 12,000 | Jun 9, 2026 | — | Form 4 |
| Nguyen AnhCo CEO | Sell | 5,241 | $9.13 | $47.84K | 3.7% | 137,837 | May 18, 2026 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 2,414 | $9.13 | $22.04K | 4.6% | 49,636 | May 18, 2026 | — | Form 4 |
| Panacea Innovation Ltd Other | Sell | 313,446 | $10.10 | $3.17M | 23.7% | 1,011,000 | May 7, 2026 | — | Form 4 |
| EcoR1 Capital, LLC Other | Buy | 507,407 | $9.35 | $4.74M | 48.6% | 1,552,000 | May 7, 2026 | — | Form 4 |
| Panacea Innovation Ltd Other | Tax withheld | 5 | $5.23 | $26.15 | 0.0% | 307,894 | Mar 17, 2026 | — | Form 4 |
| Panacea Innovation Ltd Other | Option exercise | 259,163 | $0.00 | $25.92 | 532% | 307,899 | Mar 17, 2026 | — | Form 4 |
| Grant-Huerta Yanina Other | Award | 20,300 | — | — | 63.9% | 52,050 | Mar 9, 2026 | — | Form 4 |
| Nguyen AnhCo CEO | Award | 81,100 | — | — | 131% | 143,078 | Mar 9, 2026 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 100 | $5.08 | $508.3 | 0.3% | 31,750 | Mar 2, 2026 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 377 | $5.08 | $1.92K | 1.2% | 31,850 | Mar 2, 2026 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 1,603 | $5.08 | $8.14K | 4.7% | 32,227 | Mar 2, 2026 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 24 | $5.08 | $121.85 | 0.1% | 33,830 | Mar 2, 2026 | — | Form 4 |
| Nguyen AnhCo CEO | Sell | 1,442 | $5.09 | $7.34K | 2.3% | 61,978 | Mar 2, 2026 | — | Form 4 |
| Nguyen AnhCo CEO | Sell | 1,298 | $5.09 | $6.60K | 2.0% | 63,420 | Mar 2, 2026 | — | Form 4 |
| Nguyen AnhCo CEO | Sell | 58 | $5.08 | $294.64 | 0.1% | 64,718 | Mar 2, 2026 | — | Form 4 |
| Nguyen AnhCo CEO | Sell | 198 | $5.08 | $1.01K | 0.3% | 64,776 | Mar 2, 2026 | — | Form 4 |
| Panacea Innovation Ltd Other | Sell | 80,554 | $6.07 | $489.02K | 5.7% | 1,324,446 | Jan 12, 2026 | — | Form 4 |
| Panacea Innovation Ltd Other | Tax withheld | 1 | $14.03 | $14.03 | 0.0% | 48,736 | Nov 28, 2025 | — | Form 4 |
| Panacea Innovation Ltd Other | Option exercise | 48,737 | $0.00 | $4.87 | New | 48,737 | Nov 28, 2025 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 74 | $13.19 | $976.13 | 0.2% | 33,454 | Nov 17, 2025 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 85 | $13.19 | $1.12K | 0.3% | 33,528 | Nov 17, 2025 | — | Form 4 |
| Grant-Huerta Yanina Other | Sell | 1,645 | $13.19 | $21.69K | 4.7% | 33,613 | Nov 17, 2025 | — | Form 4 |
| Nguyen AnhCo CEO | Sell | 56 | $13.19 | $738.53 | 0.1% | 64,974 | Nov 17, 2025 | — | Form 4 |
| Nguyen AnhCo CEO | Sell | 2,859 | $13.19 | $37.70K | 4.2% | 65,030 | Nov 17, 2025 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Buy (P) — Open-market or private purchase
- Sell (S) — Open-market or private sale
- Award (A) — Grant or award from the company, not a purchase
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.