InsiderClue
← All stocks

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

18
Insider
Date
Role
Action
Shares
Price
Amount
Nguyen AnhCo
17 Aug 2026
President and CEO
Sell
5,062
$8.08
$40.88K
Grant-Huerta Yanina
18 May 2026
Chief Accounting Officer
Sell
2,414
$9.13
$22.04K
Nguyen AnhCo
18 May 2026
President and CEO
Sell
5,241
$9.13
$47.84K
Panacea Innovation Ltd
7 May 2026
10% owner
Sell indirect
313,446
$10.10
$3.17M
Nguyen AnhCo
2 Mar 2026
President and CEO
Sell
1,442
$5.09
$7.34K
Nguyen AnhCo
2 Mar 2026
President and CEO
Sell
1,298
$5.09
$6.60K
Nguyen AnhCo
2 Mar 2026
President and CEO
Sell
58
$5.08
$294.64
Nguyen AnhCo
2 Mar 2026
President and CEO
Sell
198
$5.08
$1.01K
Grant-Huerta Yanina
2 Mar 2026
Chief Accounting Officer
Sell
100
$5.08
$508.30
Grant-Huerta Yanina
2 Mar 2026
Chief Accounting Officer
Sell
377
$5.08
$1.92K
Grant-Huerta Yanina
2 Mar 2026
Chief Accounting Officer
Sell
1,603
$5.08
$8.14K
Grant-Huerta Yanina
2 Mar 2026
Chief Accounting Officer
Sell
24
$5.08
$121.85
Panacea Innovation Ltd
12 Jan 2026
10% owner
Sell indirect
80,554
$6.07
$489.02K
Grant-Huerta Yanina
17 Nov 2025
Chief Accounting Officer
Sell
74
$13.19
$976.13
Grant-Huerta Yanina
17 Nov 2025
Chief Accounting Officer
Sell
85
$13.19
$1.12K
Grant-Huerta Yanina
17 Nov 2025
Chief Accounting Officer
Sell
1,645
$13.19
$21.69K
Nguyen AnhCo
17 Nov 2025
President and CEO
Sell
56
$13.19
$738.53
Nguyen AnhCo
17 Nov 2025
President and CEO
Sell
2,859
$13.19
$37.70K
Show all 22 transactions →

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