Stocks · Health care · Biological Products, (No Diagnostic Substances)

Atara Biotherapeutics, Inc.

ATRA Clue Score62

United States Fiscal year ends December CIK 0001604464 Results filed 12 Aug 2026

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What the insiders did Net buying

By person

16 insiders · 22 transactions

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

EcoR1 Capital, LLC entity

10% owner

$4.74M (1)

—

+$4.74M

1,552,000

15.46%

$14.90M

+48.6%

Panacea Innovation Ltd entity

10% owner

—

$3.65M (2)

−$3.65M

1,011,000

10.07%

$9.71M

−1.2%

Brian N Cherry

Director

$999.99K (1)

—

+$999.99K

166,486

1.66%

$1.60M

+334.5%

AnhCo Nguyen

President and CEO

—

$142.40K (8)

−$142.40K

132,775

1.32%

$1.27M

+67.8%

Yanina Grant-Huerta

Chief Accounting Officer

—

$56.52K (8)

−$56.52K

49,636

0.4945%

$476.51K

+25.1%

Adiumentum Capital Fund I LP entity

Director

—

—

—

1,209,395

12.05%

$11.61M

+6.7%

Redmile Group, LLC entity

Director

—

—

—

636,852

6.34%

$6.11M

+44.2%

Pascal Touchon

Director

—

—

—

77,955

0.7766%

$748.37K

+11.2%

Eric J Hyllengren

Former EVP, CFO & COO

—

—

—

56,231

0.5602%

$539.82K

+127.1%

William K Heiden

Director

—

—

—

34,188

0.3406%

$328.20K

+138.1%

Carol Giltner Gallagher

Director

—

—

—

33,012

0.3289%

$316.92K

+31.1%

Matthew K Fust

Director

—

—

—

30,188

0.3007%

$289.80K

+191.4%

Jill Henrich

EVP, Chief Regulatory Officer

—

—

—

18,679

0.1861%

$179.32K

−9.9%

Maria Grazia Roncarolo

Director

—

—

—

17,368

0.1730%

$166.73K

+82.1%

Ameet Mallik

Director

—

—

—

16,928

0.1686%

$162.51K

+86.0%

Gregory Austin Ciongoli

Director

—

—

—

12,000

0.1195%

$115.20K

—