EcoR1 Capital, LLC

10% Owner

10% Owner at Atara Biotherapeutics, Inc., filing insider transactions between 2026-04-20 and 2026-05-07. Also reports transactions at 1 other company.

Total Purchases

$4.7M

1 transaction

Total Sales

$65.0M

1 transaction

Companies Traded

2 total filings

Active Since

2026-04-20

Last: 2026-05-07

Companies

ATRA2026-05-07

Atara Biotherapeutics, Inc.

↑ $4.7M (1)

TRAX2026-04-20

First Tracks Biotherapeutics, Inc.

↓ $65.0M (1)

Other Reporting Insiders at Atara Biotherapeutics, Inc.

Brian N. Cherry
Director
Last filing 2026-09-04
AnhCo Nguyen
Director & President and CEO
Last filing 2026-08-17
AnhCo Nguyen
Director & President and CEO
Last filing 2026-05-18
Yanina Grant-Huerta
Chief Accounting Officer
Last filing 2026-05-18
Panacea Innovation Ltd
10% Owner
Last filing 2026-05-07

Transaction History

Date	Ticker	Type	Shares	Price	Value	Owned After
2026-05-07	ATRA	Purchase	507.4K	$9.35	$4.7M	1.55M	SEC ↗
2026-04-20	TRAX	Sale	4.71M	$13.81	$65.0M	3.17M	SEC ↗