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ATRANasdaq
Atara Biotherapeutics, Inc.
Biological Products, (No Diagnostic Substances) · DE · CIK 1604464
Develops transformative therapies for serious diseases like cancers and autoimmune conditions
red 8-K · 90d
$94M
Market cap
$11.17
Last close
+6.3%
1D
+5.3%
5D
60K
Volume
Price · last 39 sessions+128.9%
May 4L $4.76 · H $11.26Jun 29
247
Total filings
Jun 26, 2026
Last filing
12/31
Fiscal year end
8-KExecutive ChangeJun 26, 20268-KExecutive Change · Shareholder VoteJun 12, 2026SC 13D/ASC 13D/AMay 14, 2026424B5424B5May 12, 202610-Q10-QMay 12, 20268-KCompany UpdateMay 12, 2026SC 13D/ASC 13D/AMay 11, 20268-KCompany UpdateMay 7, 20268-KDelisting NoticeMay 1, 2026DEF 14ADEF 14AApr 24, 2026DEFA14ADEFA14AApr 24, 2026424B5424B5Mar 16, 202610-K10-KMar 16, 20268-KResults of OperationsMar 16, 20268-KCompany UpdateMar 12, 20268-KCompany UpdateMar 3, 20268-KMaterial Agreement · Equity IssuanceFeb 23, 2026SC 13D/ASC 13D/AJan 14, 20268-KResults of Operations · Company UpdateJan 12, 20268-KMaterial AgreementJan 2, 202610-Q10-QNov 12, 20258-KResults of OperationsNov 12, 20258-KExit / Disposal CostsOct 7, 20258-KExecutive ChangeSep 4, 202510-Q10-QAug 11, 20258-KResults of OperationsAug 11, 20258-KResults of Operations · Company UpdateJul 14, 20258-KShareholder VoteJun 11, 20258-KCompany UpdateMay 16, 2025424B5424B5May 15, 202510-Q10-QMay 15, 20258-KExecutive Change · Results of OperationsMay 15, 20258-KExit / Disposal CostsMay 12, 20258-KCompany UpdateMay 6, 2025DEFA14ADEFA14AApr 28, 2025DEF 14ADEF 14AApr 28, 20258-KMaterial AgreementApr 4, 20258-KExecutive ChangeMar 31, 202510-K10-KMar 7, 20258-KResults of OperationsMar 7, 20258-KExit / Disposal CostsMar 3, 20258-KExit / Disposal CostsJan 27, 20258-KCompany UpdateJan 21, 20258-KResults of Operations · Company UpdateJan 16, 20258-KBylaw AmendmentDec 23, 202410-Q10-QNov 12, 20248-KExecutive Change · Results of OperationsNov 12, 20248-KExecutive ChangeOct 15, 2024424B5424B5Sep 4, 20248-KExecutive Change · Company UpdateSep 3, 202410-Q10-QAug 12, 20248-KExecutive Change · Results of OperationsAug 12, 20248-KCompany UpdateJul 17, 20248-KSecurity-Holder Rights · Bylaw AmendmentJun 20, 20248-KCompany UpdateJun 17, 20248-KShareholder VoteJun 11, 2024SC 13DSC 13DMay 22, 202410-Q10-QMay 9, 20248-KResults of OperationsMay 9, 2024DEFA14ADEFA14AApr 26, 2024DEF 14ADEF 14AApr 26, 20248-KExecutive ChangeMar 29, 202410-K10-KMar 28, 20248-KResults of OperationsMar 28, 2024SC 13GSC 13GMar 18, 20248-KExecutive ChangeFeb 23, 2024424B5424B5Jan 9, 20248-KDelisting Notice · Material AgreementJan 9, 20248-KExecutive Change · Exit / Disposal CostsJan 8, 20248-KCompany UpdateDec 20, 2023SC 13GSC 13GNov 21, 20238-KCompany UpdateNov 9, 20238-KCompany UpdateNov 1, 202310-Q10-QNov 1, 20238-KMaterial Agreement · Results of OperationsNov 1, 20238-KCompany UpdateSep 20, 202310-Q10-QAug 8, 20238-KResults of OperationsAug 8, 20238-KExecutive ChangeJun 9, 20238-KExecutive Change · Shareholder VoteJun 5, 2023
Insider Activity
In the 90 days to Mar 2, 2026: 3 sold $515K.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Mar 2, 2026 | Grant-Huerta YaninaChief Accounting Officer | Sell | 1,603 | $5.08 | $8K |
| Mar 2, 2026 | Nguyen AnhcoPresident and CEO | Sell | 1,442 | $5.09 | $7K |
| Mar 2, 2026 | Nguyen AnhcoPresident and CEO | Sell | 1,298 | $5.09 | $7K |
| Mar 2, 2026 | Grant-Huerta YaninaChief Accounting Officer | Sell | 377 | $5.08 | $2K |
| Mar 2, 2026 | Nguyen AnhcoPresident and CEO | Sell | 198 | $5.08 | $1K |
| Mar 2, 2026 | Grant-Huerta YaninaChief Accounting Officer | Sell | 100 | $5.08 | $508 |
| Mar 2, 2026 | Nguyen AnhcoPresident and CEO | Sell | 58 | $5.08 | $295 |
| Mar 2, 2026 | Grant-Huerta YaninaChief Accounting Officer | Sell | 24 | $5.08 | $122 |
| Jan 12, 2026 | Huang JamesDirector,TenPercentOwner | Sell | 80,554 | $6.07 | $489K |
| Nov 17, 2025 | Nguyen AnhcoPresident and CEO | Sell | 2,859 | $13.19 | $38K |
| Nov 17, 2025 | Grant-Huerta YaninaChief Accounting Officer | Sell | 1,645 | $13.19 | $22K |
| Nov 17, 2025 | Grant-Huerta YaninaChief Accounting Officer | Sell | 85 | $13.19 | $1K |
| Nov 17, 2025 | Grant-Huerta YaninaChief Accounting Officer | Sell | 74 | $13.19 | $976 |
| Nov 17, 2025 | Nguyen AnhcoPresident and CEO | Sell | 56 | $13.19 | $739 |
Open-market buys & sells (Form 4, transaction codes P/S). Source: SEC structured insider data.
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