LIVE FROM THE DATABASETRANSACTIONS 362,430COMPANIES 5,763LATEST TRADE Oct 16UPDATED Oct 17, 12:31 AM
ATRACIK 0001604464

Atara Biotherapeutics, Inc.

37 transactions by 9 insiders, from November 17, 2025 to September 4, 2026.

Transactions
379 insiders
Bought · P
$5.7Mopen market
Sold · S
$3.9Mopen market
Net
+$1.9Mnet buying

Officers and directors

People inside the company. What they do with their own shares is the reason this data exists.

InsiderTradesPlannedBoughtSold
AnhCo NguyenCEO9——$142K
Yanina Grant-HuertaCAO9——$57K
Panacea Innovation LtdDir8——$3.7M
Redmile Group, LLCDir5———
Brian N. CherryDir2—$1000K—
Matthew K. FustDir1———
William K. HeidenDir1———
Gregory Austin CiongoliDir1———

Large holders and funds

Holders above 10%, often funds. They file the same form, but they trade for portfolio reasons, not because of what they know.

InsiderTradesPlannedBoughtSold
EcoR1 Capital, LLC10%1—$4.7M—

All transactions

37 in total, newest filings first.

InsiderDateCodeSharesPriceValue
Brian N. CherryDirSep 4P104,166$9.60$1000K
AnhCo NguyenCEOAug 17S5,062$8.08$41K
Redmile Group, LLCDirDERIVJOINTJul 22M55,387$0.00—?
Redmile Group, LLCDirDERIVJOINTJul 22M38,735$0.00—?
Redmile Group, LLCDirDERIVJOINTJul 22M101,089$0.00—?
Redmile Group, LLCDirJOINTJul 22F60——
Redmile Group, LLCDirJOINTJul 22M195,211——
Brian N. CherryDirJun 11A24,000$0.00—
William K. HeidenDirJun 9A12,000$0.00—
Matthew K. FustDirJun 9A12,000$0.00—
Gregory Austin CiongoliDirJun 9A12,000$0.00—
AnhCo NguyenCEOMay 18S5,241$9.13$48K
Yanina Grant-HuertaCAOMay 18S2,414$9.13$22K
Panacea Innovation LtdDirJOINTMay 7S313,446$10.10$3.2M
EcoR1 Capital, LLC10%May 7P507,407$9.35$4.7M
Panacea Innovation LtdDirDERIVJOINTMar 17M259,163$6.61$1.7M?
Panacea Innovation LtdDirJOINTMar 17F5$5.23$26
Panacea Innovation LtdDirJOINTMar 17M259,163$0.00$26
AnhCo NguyenCEOMar 9A81,100$0.00—
Yanina Grant-HuertaCAOMar 9A20,300$0.00—
Yanina Grant-HuertaCAOMar 2S100$5.08$508
Yanina Grant-HuertaCAOMar 2S377$5.08$2K
Yanina Grant-HuertaCAOMar 2S1,603$5.08$8K
Yanina Grant-HuertaCAOMar 2S24$5.08$122
AnhCo NguyenCEOMar 2S1,442$5.09$7K
AnhCo NguyenCEOMar 2S1,298$5.09$7K
AnhCo NguyenCEOMar 2S58$5.08$295
AnhCo NguyenCEOMar 2S198$5.08$1K
Panacea Innovation LtdDirJOINTJan 12S80,554$6.07$489K
Panacea Innovation LtdDirDERIVJOINTNov 28M48,737$6.61$322K?
Panacea Innovation LtdDirJOINTNov 28F1$14.03$14
Panacea Innovation LtdDirJOINTNov 28M48,737$0.00$5
AnhCo NguyenCEONov 17S56$13.19$739
AnhCo NguyenCEONov 17S2,859$13.19$38K
Yanina Grant-HuertaCAONov 17S74$13.19$976
Yanina Grant-HuertaCAONov 17S85$13.19$1K
Yanina Grant-HuertaCAONov 17S1,645$13.19$22K