Official SEC submissions

Atara Biotherapeutics SEC Filings

Atara Biotherapeutics (ATRA) SEC filings, periodic reports and insider submissi…

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Atara Biotherapeutics's latest SEC filing is 144.

It was filed on August 26, 2026, and 40 recent filings are available.

Each row links directly to the SEC document and filing index.

Official SEC EDGAR submissions

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Recent SEC filings

144

Planned securities sale

Filed: 2026-08-26

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Insider transaction

Filed: 2026-08-26

Report date: 2026-08-17

FORM 4

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10-Q

Periodic report

Filed: 2026-08-12

Report date: 2026-06-30

10-Q

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8-K

Current report

Filed: 2026-08-12

Report date: 2026-08-12

8-K

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Insider transaction

Filed: 2026-07-24

Report date: 2026-07-22

OWNERSHIP DOCUMENT

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8-K

Current report

Filed: 2026-06-26

Report date: 2026-06-22

8-K

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Insider transaction

Filed: 2026-06-15

Report date: 2026-06-11

FORM 4

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8-K

Current report

Filed: 2026-06-12

Report date: 2026-06-09

CURRENT REPORT

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Insider transaction

Filed: 2026-06-11

Report date: 2026-06-09

FORM 4

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Insider transaction

Filed: 2026-06-11

Report date: 2026-06-09

FORM 4

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Insider transaction

Filed: 2026-06-11

Report date: 2026-06-09

FORM 4

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Insider transaction

Filed: 2026-05-20

Report date: 2026-05-18

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Insider transaction

Filed: 2026-05-20

Report date: 2026-05-18

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144

Planned securities sale

Filed: 2026-05-18

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144

Planned securities sale

Filed: 2026-05-18

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10-Q

Periodic report

Filed: 2026-05-12

Report date: 2026-03-31

10-Q

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8-K

Current report

Filed: 2026-05-12

Report date: 2026-05-12

8-K

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Insider transaction

Filed: 2026-05-11

Report date: 2026-05-07

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Insider transaction

Filed: 2026-05-11

Report date: 2026-05-07

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144

Planned securities sale

Filed: 2026-05-07

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8-K

Current report

Filed: 2026-05-07

Report date: 2026-05-07

8-K

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8-K

Current report

Filed: 2026-05-01

Report date: 2026-04-30

8-K

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DEF 14A

Proxy statement

Filed: 2026-04-24

Report date: 2026-04-24

DEF 14A

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DEFA14A

Proxy statement

Filed: 2026-04-24

DEFA14A

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Insider transaction

Filed: 2026-03-19

Report date: 2026-03-17

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10-K

Periodic report

Filed: 2026-03-16

Report date: 2025-12-31

10-K

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8-K

Current report

Filed: 2026-03-16

Report date: 2026-03-16

8-K

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8-K

Current report

Filed: 2026-03-12

Report date: 2026-03-12

8-K

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Insider transaction

Filed: 2026-03-11

Report date: 2026-03-09

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Insider transaction

Filed: 2026-03-11

Report date: 2026-03-09

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Insider transaction

Filed: 2026-03-04

Report date: 2026-03-02

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Insider transaction

Filed: 2026-03-04

Report date: 2026-03-02

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8-K

Current report

Filed: 2026-03-03

Report date: 2026-03-03

8-K

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144

Planned securities sale

Filed: 2026-03-02

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144

Planned securities sale

Filed: 2026-03-02

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8-K

Current report

Filed: 2026-02-23

Report date: 2026-02-20

8-K

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Insider transaction

Filed: 2026-01-14

Report date: 2026-01-12

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144

Planned securities sale

Filed: 2026-01-12

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8-K

Current report

Filed: 2026-01-12

Report date: 2026-01-12

8-K

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8-K

Current report

Filed: 2026-01-02

Report date: 2025-12-30

8-K

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Verified data

Recent filing categories: 5
Recent filings: 40
SEC CIK: 0001604464
Latest filing date: August 26, 2026

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