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Atara Biotherapeutics, Inc.

ATRA Net buying

CIK 0001604464 #4357 in the set updated 17 Sep 2026

Bought (12 mo)

$5.74M

out of their own pocket, the only kind of buying there is

Sold (12 mo)

$3.85M

$0.00 on a plan · $0.00 straight out of an exercise

Sold at will

$3.85M

18 of 18 sales

Net

+$1.89M

+$1.89M against sales at will

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%

Cherry Brian N

Director

$999.99K (1)

—

+$999.99K

166,486

1.66%

$1.60M

+334.5%

Nguyen AnhCo

President and CEO

—

$142.40K (8)

−$142.40K

132,775

1.32%

$1.27M

+67.8%

Grant-Huerta Yanina

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%

Touchon Pascal

Director

—

77,955

0.7766%

$748.37K

+11.2%

Hyllengren Eric J

Former EVP, CFO & COO

—

56,231

0.5602%

$539.82K

+127.1%

HEIDEN WILLIAM K

Director

—

34,188

0.3406%

$328.20K

+138.1%

Gallagher Carol Giltner

Director

—

33,012

0.3289%

$316.92K

+31.1%

Fust Matthew K

Director

—

30,188

0.3007%

$289.80K

+191.4%

Henrich Jill

EVP, Chief Regulatory Officer

—

18,679

0.1861%

$179.32K

−9.9%

Roncarolo Maria Grazia

Director

—

17,368

0.1730%

$166.73K

+82.1%

MALLIK AMEET

Director

—

16,928

0.1686%

$162.51K

+86.0%

Ciongoli Gregory Austin

Director

—

12,000

0.1195%

$115.20K

—

Individual transactions

Nothing of that kind in this period.

What was left out

Form 4 filings counted 20

Amendments (4/A) skipped 0

Filings about a different issuer 0

Unreadable filings 0

Joint filings 5

Sales on a Rule 10b5-1 plan 0

Sales straight out of an exercise 0

Sales at will 18

Transactions with no price 0

Shares from compensation/vesting 664,577

History held since 19 Sep 2016