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The company

Atara Biotherapeutics, Inc.

ATRA · Nasdaq

Health CareBiotechnologyIn trend

ATRA stood above a rising 150-day average in 19 of the last 52 weekly readings, including each of the last 7 weeks. It is 10.6% above that average now. Biotechnology: 15% of its 561 stocks in an uptrend (−17 points in four weeks); Health Care: 25% (−11 points in four weeks).

SEC filings

Statistics

Rotation: In trend
Weeks in an uptrend: 7 in a row
Industry in uptrend: 15% -17 in 4 wk
Insider buys, 12 months: $11.5M
Insider sales, 12 months: $7.6M
Officials’ trades on record: 0
Institutions holding: 35 (+3)

In the rotation

Each square a week: lit when it closed above a rising 150-day average. 19 of 52 weeks.

17 Apr – 16 Oct

Biotechnology: Few of its stocks are in an uptrend and the share has fallen sharply over four weeks. Health Care: A minority of its stocks are in an uptrend and the share has fallen sharply over four weeks.

Money in and out

1 Nov 2024 – 1 Oct 2026

Open-market buys above the line and sales below, in dollars.

Congress and officials

No member of Congress or official has disclosed a trade in it.

Insiders

Buy orders, 12 months2

Sale orders, 12 months10

Buyers · sellers2 · 4

Who	Did	Shares	Traded
Brian N. CherryDirector	bought	104,166at $9.60	4 Sep 2026filed 4 Sep 2026
Anhco NguyenPresident and CEO	sold	5,062at $8.08	17 Aug 2026filed 26 Aug 2026
Yanina Grant-HuertaChief Accounting Officer	sold	2,414at $9.13	18 May 2026filed 20 May 2026
Anhco NguyenPresident and CEO	sold	5,241at $9.13	18 May 2026filed 20 May 2026
Ecor1 Capital, Llc10% owner	bought	507,407at $9.35	7 May 2026filed 11 May 2026
Panacea Innovation Ltd10% owner	sold	313,446at $10.10	7 May 2026filed 11 May 2026
Anhco NguyenPresident and CEO	sold	198at $5.08	2 Mar 2026filed 4 Mar 2026
Anhco NguyenPresident and CEO	sold	58at $5.08	2 Mar 2026filed 4 Mar 2026
Anhco NguyenPresident and CEO	sold	1,298at $5.09	2 Mar 2026filed 4 Mar 2026
Anhco NguyenPresident and CEO	sold	1,442at $5.09	2 Mar 2026filed 4 Mar 2026
Yanina Grant-HuertaChief Accounting Officer	sold	24at $5.08	2 Mar 2026filed 4 Mar 2026
Yanina Grant-HuertaChief Accounting Officer	sold	1,603at $5.08	2 Mar 2026filed 4 Mar 2026

Lines filed since 2 January 2026, newest first; every insider’s older lines are on their own page.

Institutions

Holders35+3 on the quarter

New · exited5 · 2

Reported value$50.8M

Quarter to 30 Jun 2026, against 31 Mar 2026; newest filing 31 Aug 2026.

Manager	Shares	Change
EcoR1 Capital, LLCadded · filed 14 Aug 2026	1,552,000$17.8M	+1,452,407+1458.3%
ADAGE CAPITAL PARTNERS GP, L.L.C.added · filed 14 Aug 2026	850,000$9.8M	+150,000+21.4%
Point72 Asset Management, L.P.added · filed 14 Aug 2026	687,718$7.9M	+493,454+254.0%
Redmile Group, LLCunchanged · filed 14 Aug 2026	441,701$5.1M	00.0%
VANGUARD CAPITAL MANAGEMENT LLCadded · filed 13 Aug 2026	247,047$2.8M	+29,185+13.4%
MACKENZIE FINANCIAL CORPreduced · filed 13 Aug 2026	233,249$2.7M	-80,371−25.6%
BlackRock, Inc.added · filed 7 Aug 2026	84,455$970K	+5,433+6.9%
GEODE CAPITAL MANAGEMENT, LLCadded · filed 12 Aug 2026	75,128$863K	+8,982+13.6%
STALEY CAPITAL ADVISERS INCunchanged · filed 11 Aug 2026	50,000$574K	00.0%
VANGUARD FIDUCIARY TRUST COadded · filed 13 Aug 2026	43,036$494K	+9,415+28.0%