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Atara Biotherapeutics, Inc. (ATRA)

Atara Biotherapeutics, Inc. (ATRA) Insider Trading

Directors, officers and holders of more than 10% of ATRA report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 73 transactions on file: 4 with code P, 24 with code S and 22 with other codes.

DateInsiderCodeShares
Sep 4, 2026Cherry Brian NP Purchase104,166
Aug 17, 2026Nguyen AnhCoS Sale5,062
Jul 22, 2026Redmile Group, LLCM Exercise195,211
Jul 22, 2026Redmile Group, LLCM Exercise55,387
Jul 22, 2026Redmile Group, LLCM Exercise38,735
Jul 22, 2026Redmile Group, LLCM Exercise101,089
Jul 22, 2026Redmile Group, LLCF Tax Payment60
Jun 11, 2026Cherry Brian NA Award24,000
Jun 9, 2026Ciongoli Gregory AustinA Award12,000
Jun 9, 2026HEIDEN WILLIAM KA Award12,000
Jun 9, 2026Fust Matthew KA Award12,000
May 18, 2026Nguyen AnhCoS Sale5,241
May 18, 2026Grant-Huerta YaninaS Sale2,414
May 7, 2026EcoR1 Capital, LLCP Purchase507,407
May 7, 2026Panacea Innovation LtdS Sale313,446
Mar 17, 2026Panacea Innovation LtdM Exercise259,163
Mar 17, 2026Panacea Innovation LtdM Exercise259,163
Mar 17, 2026Panacea Innovation LtdF Tax Payment5
Mar 9, 2026Grant-Huerta YaninaA Award20,300
Mar 9, 2026Nguyen AnhCoA Award81,100
Mar 2, 2026Nguyen AnhCoS Sale1,442
Mar 2, 2026Grant-Huerta YaninaS Sale24
Mar 2, 2026Grant-Huerta YaninaS Sale1,603
Mar 2, 2026Grant-Huerta YaninaS Sale377
Mar 2, 2026Grant-Huerta YaninaS Sale100
Mar 2, 2026Nguyen AnhCoS Sale198
Mar 2, 2026Nguyen AnhCoS Sale58
Mar 2, 2026Nguyen AnhCoS Sale1,298
Jan 12, 2026Panacea Innovation LtdS Sale80,554
Nov 28, 2025Panacea Innovation LtdM Exercise48,737
Nov 28, 2025Panacea Innovation LtdF Tax Payment1
Nov 28, 2025Panacea Innovation LtdM Exercise48,737
Nov 17, 2025Grant-Huerta YaninaS Sale85
Nov 17, 2025Nguyen AnhCoS Sale2,859
Nov 17, 2025Nguyen AnhCoS Sale56
Nov 17, 2025Grant-Huerta YaninaS Sale1,645
Nov 17, 2025Grant-Huerta YaninaS Sale74
Aug 18, 2025Nguyen AnhCoS Sale1,620
Aug 18, 2025Nguyen AnhCoS Sale1,281
Aug 18, 2025Grant-Huerta YaninaS Sale55
Aug 18, 2025Nguyen AnhCoS Sale57
Aug 18, 2025Grant-Huerta YaninaS Sale1,668
Aug 18, 2025Grant-Huerta YaninaS Sale86
Aug 15, 2025Panacea Innovation LtdP Purchase55,000
Jul 17, 2025Panacea Innovation LtdP Purchase19,335
Jun 10, 2025MALLIK AMEETA Award7,828
Jun 10, 2025Touchon PascalA Award7,828
Jun 10, 2025Gallagher Carol GiltnerA Award7,828
Jun 10, 2025Fust Matthew KA Award7,828
Jun 10, 2025Roncarolo Maria GraziaA Award7,828

The full Form 4 history is on the ATRA company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.