Atara Biotherapeutics Ownership & Insider Activity

Atara Biotherapeutics (ATRA) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 43.7% of shares outstanding. Institutional investors hold 6.7%. Over the past 90 days, insiders made 1 purchase worth $1000K and 1 sale worth $41K.

Shares Outstanding

10.038M

Shares Float

7.352M

Insider Shares Owned

3.937M

Insider % Owned

43.7%

Institutional Shares Held

669.345K

Institutional % Held

6.7%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

$1000K total

Sales (90d)

$41K total

Net Activity

Net Buying

Net Value (90d)

$959K

Atara Biotherapeutics Insider Transactions (Last 6 Months)

See all insider trades →

Date	Insider	Title	Type	Shares	Price	Value
Sep 4, 2026	Brian Cherry	—	BUY	104.166K	$9.60	$1000K
Aug 17, 2026	AnhCo Nguyen	PRESIDENT AND CEO	SELL	5.062K	$8.08	$41K
May 18, 2026	AnhCo Nguyen	PRESIDENT AND CEO	SELL	5.241K	$9.13	$48K
May 18, 2026	Yanina Grant-Huerta	CHIEF ACCOUNTING OFFICER	SELL	2.414K	$9.13	$22K
May 7, 2026	Panacea Innovation Ltd, James Huang	—	SELL	313.446K	$10.10	$3.2M
May 7, 2026	EcoR Capital LLC	10% OWNER	BUY	507.407K	$9.35	$4.7M

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Atara Biotherapeutics Inc

Atara Biotherapeutics Ownership & Insider Activity

Atara Biotherapeutics Insider Transactions (Last 6 Months)

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