Atara Biotherapeutics, Inc.
ATRA · Biological Products, (No Diagnostic Substances) · 9.0M shares · -53%/yr ↓ buyback · EDGAR filings ↗
Reference price $9.13 · est. market cap ~$82M — last insider sale, 2026-05-18 (estimated from the dated SEC Form 4 price × shares outstanding — not a live quote)
Grade
D48Cell-therapy company whose reported profit is one-time/deal-driven, with weak liquidity and cash burn.
Strengths
- Reported operating profit (deal-driven) — operating margin 30%, ROA artifact
Risks
- Profit is one-time, not operational — per metrics
- Weak liquidity — current ratio 0.82 (17th)
- Cash burn — FCF -$51M
Notable findings
- Fund exitedNotable fund(s) exited this quarter: VANGUARD GROUP INC, CITADEL ADVISORS LLC, RENAISSANCE TECHNOLOGIES LLC
- Cash burnNegative free cash flow (-50.9M)
- Weak liquidityCurrent ratio 0.82 (<1)
- Exec changeRecent 8-K item 5.02 8-K ↗
- Buying back stockNet buyback — share count -53%/yr over 3y
- Insider buyingInsider buying — 1 open-market buy(s) by 1 insider(s) (~$5M, last 6mo) Form 4 ↗
- Revenue declineRevenue -67.6% YoY
- Insider sellingInsider selling — 12 open-market sale(s) by 3 insider(s) (cluster of 3 insiders, ~$4M, last 6mo) Form 4 ↗
- Notable holderHeld by 2 notable fund(s): STATE STREET CORP, FMR LLC (as of 2026-03-31)
Quarterly revenue
Last 4 quarters · from SEC filings.
Key metrics
Operating margin
29.7%
Net margin
27.1%
Return on equity
-84.9%
Return on assets
161.5%
Revenue growth (QoQ)
-67.6%
Interest coverage
9.5×
Current ratio
0.8×
Free cash flow
-$51M
EBITDA
$38M
Tangible book value
-$39M
Cash & investments
$8M
Cash runway
1q
Stock comp / revenue
8.1%
Insider transactions · last 18 months
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| 2026-06-11 | Cherry Brian N | Grant | 24K | — |
| 2026-06-09 | HEIDEN WILLIAM K | Grant | 12K | — |
| 2026-06-09 | Fust Matthew K | Grant | 12K | — |
| 2026-06-09 | Ciongoli Gregory Austin | Grant | 12K | — |
| 2026-05-18 | Nguyen AnhCo | Sell | 5.2K | $9.13 |
| 2026-05-18 | Grant-Huerta Yanina | Sell | 2.4K | $9.13 |
| 2026-05-07 | Panacea Innovation Ltd | Sell | 313K | $10.10 |
| 2026-05-07 | EcoR1 Capital, LLC | Buy | 507K | $9.35 |
| 2026-03-17 | Panacea Innovation Ltd | Option exercise | 259K | $0.00 |
| 2026-03-17 | Panacea Innovation Ltd | Tax withheld | 5 | $5.23 |
| 2026-03-09 | Nguyen AnhCo | Grant | 81K | — |
| 2026-03-09 | Grant-Huerta Yanina | Grant | 20K | — |
| 2026-03-02 | Grant-Huerta Yanina | Sell | 24 | $5.08 |
| 2026-03-02 | Grant-Huerta Yanina | Sell | 1.6K | $5.08 |
| 2026-03-02 | Grant-Huerta Yanina | Sell | 377 | $5.08 |
| 2026-03-02 | Grant-Huerta Yanina | Sell | 100 | $5.08 |
| 2026-03-02 | Nguyen AnhCo | Sell | 198 | $5.08 |
| 2026-03-02 | Nguyen AnhCo | Sell | 58 | $5.08 |
| 2026-03-02 | Nguyen AnhCo | Sell | 1.3K | $5.09 |
| 2026-03-02 | Nguyen AnhCo | Sell | 1.4K | $5.09 |
| 2026-01-12 | Panacea Innovation Ltd | Sell | 81K | $6.07 |
| 2025-11-28 | Panacea Innovation Ltd | Option exercise | 49K | $0.00 |
| 2025-11-28 | Panacea Innovation Ltd | Tax withheld | 1 | $14.03 |
| 2025-11-17 | Nguyen AnhCo | Sell | 2.9K | $13.19 |
| 2025-11-17 | Nguyen AnhCo | Sell | 56 | $13.19 |
| 2025-11-17 | Grant-Huerta Yanina | Sell | 1.6K | $13.19 |
| 2025-11-17 | Grant-Huerta Yanina | Sell | 85 | $13.19 |
| 2025-11-17 | Grant-Huerta Yanina | Sell | 74 | $13.19 |
| 2025-08-18 | Nguyen AnhCo | Sell | 57 | $11.61 |
| 2025-08-18 | Nguyen AnhCo | Sell | 1.3K | $11.62 |
| 2025-08-18 | Nguyen AnhCo | Sell | 1.6K | $11.62 |
| 2025-08-18 | Grant-Huerta Yanina | Sell | 55 | $11.61 |
| 2025-08-18 | Grant-Huerta Yanina | Sell | 86 | $11.61 |
| 2025-08-18 | Grant-Huerta Yanina | Sell | 1.7K | $11.61 |
| 2025-08-15 | Panacea Innovation Ltd | Buy | 55K | $12.19 |
| 2025-07-17 | Panacea Innovation Ltd | Buy | 19K | $9.64 |
| 2025-06-10 | Gallagher Carol Giltner | Grant | 7.8K | — |
| 2025-06-10 | Fust Matthew K | Grant | 7.8K | — |
| 2025-06-10 | Touchon Pascal | Grant | 7.8K | — |
| 2025-06-10 | Roncarolo Maria Grazia | Grant | 7.8K | — |
| 2025-06-10 | MALLIK AMEET | Grant | 7.8K | — |
| 2025-06-10 | HEIDEN WILLIAM K | Grant | 7.8K | — |
| 2025-05-16 | Grant-Huerta Yanina | Sell | 2.2K | $6.76 |
| 2025-05-16 | Nguyen AnhCo | Sell | 3.3K | $6.76 |
| 2025-05-16 | Adiumentum Capital Fund I LP | Grant | 76K | $6.61 |
| 2025-03-03 | Nguyen AnhCo | Sell | 3.3K | $7.00 |
| 2025-03-03 | Hyllengren Eric J | Sell | 1.2K | $7.00 |
| 2025-03-03 | Henrich Jill | Sell | 1.1K | $7.00 |
| 2025-01-27 | Hyllengren Eric J | Grant | 34K | — |
All non-derivative Form 4 activity (SEC), newest first.
Notable events (8-K)
Recent filings
| Form | Filed | Period | Accession |
|---|---|---|---|
| 8-K | 2026-06-26 | 2026-06-22 | 0001193125-26-285498 ↗ |
| 8-K | 2026-06-12 | 2026-06-09 | 0001213900-26-068264 ↗ |
| 8-K | 2026-05-12 | 2026-05-12 | 0001193125-26-219420 ↗ |
| 10-Q | 2026-05-12 | 2026-03-31 | 0001193125-26-219482 ↗ |
| 8-K | 2026-05-07 | 2026-05-07 | 0001193125-26-210413 ↗ |
| 8-K | 2026-05-01 | 2026-04-30 | 0001193125-26-201397 ↗ |
| 10-K | 2026-03-16 | 2025-12-31 | 0001193125-26-108361 ↗ |
| 8-K | 2026-03-16 | 2026-03-16 | 0001193125-26-108344 ↗ |
| 8-K | 2026-03-12 | 2026-03-12 | 0001193125-26-103127 ↗ |
| 8-K | 2026-03-03 | 2026-03-03 | 0001193125-26-086793 ↗ |
| 8-K | 2026-02-23 | 2026-02-20 | 0001193125-26-062534 ↗ |
| 8-K | 2026-01-12 | 2026-01-12 | 0001193125-26-010342 ↗ |