ATRA- Atara Biotherapeutics, Inc.

Name: Atara Biotherapeutics, Inc. Insider Trading Data
Creator: U.S. Securities and Exchange Commission
License: https://www.sec.gov/privacy#accessibility

Atara Biotherapeutics, Inc. (ATRA) has 10 insiders with recent SEC Form 4 filings, including 2 buys and 15 sells. ATRA is classified in the Biotechnology industry within the Health Care sector.

Insider Ownership

Role	Insider	Shares	Value	30d
10%	Panacea Innovation Ltd	1.32M	$11.05M	-
10%	Adiumentum Capital Fund I LP	377.2K	$3.15M	-
CEO	Nguyen Anhco	143.1K	$1.19M	-
?	Touchon Pascal	78.0K	$650.1K	-
Other	Grant-Huerta Yanina	52.0K	$434.1K	-

Activity

Buys and sells only

Transactions

10 filings

Date	Insider	Role	Type	Shares	Price	Value	Chg%	3M	12M
Jan 12, 2026	Panacea Innovation Ltd60	10% Owner	Sell	80,554	$6.07	$489,019.17	-5.7%	-20.9%	-
Nov 17, 2025	Nguyen Anhco67	President And CEO	Sell	2,915	$13.19	$38,437.30	-2.2%	-65.7%	-
Nov 17, 2025	Grant-Huerta Yanina	Chief Accounting Officer	Sell	1,804	$13.19	$23,788.08	-1.8%	-65.7%	-
Aug 18, 2025	Nguyen Anhco67	President And CEO	Sell	2,958	$11.62	$34,360.30	-1.4%	+14.1%	-
Aug 18, 2025	Grant-Huerta Yanina	Chief Accounting Officer	Sell	1,809	$11.61	$21,009.37	-1.6%	+14.1%	-
Aug 15, 2025	Panacea Innovation Ltd60	10% Owner	Buy	55,000	$12.19	$670,422.50	+4.1%	+9.0%	-
Jul 17, 2025	Panacea Innovation Ltd60	10% Owner	Buy	19,335	$9.64	$186,372.00	+1.5%	+57.4%	-
May 16, 2025	Grant-Huerta Yanina	Chief Accounting Officer	Sell	2,218	$6.76	$15,000.33	-5.6%	+71.3%	-
May 16, 2025	Nguyen Anhco67	President And CEO	Sell	3,276	$6.76	$22,155.59	-4.4%	+71.3%	-
Mar 3, 2025	Nguyen Anhco67	President And CEO	Sell	3,331	$7.00	$23,307.01	-4.3%	+14.3%	-22.6%

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Insider	Role	Shares	Value	Buys	Sells

Date	Ticker	Insider	Role	Type	Shares	Price	Value	Chg%	SEC