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Nasdaq · CIK 0001604464

ATRA Atara Biotherapeutics, Inc.

Insider trading from SEC Form 4. Last filing 38 d ago. Close $9.48 on Oct 9, 2026, +127% from the 52-week low and -48% from the high.

Last 90 days

Net insider value
+$1000k
more bought than sold
Buys
1
$1000k by 1 insider
Sells
0
$0 by 0 insiders
Insiders on file
13
with a Form 4 at this company

Price and insider trades, last year

ATRAOct 9, 2026 · close 9.48

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™

Signals

Open-market buys and sells at Atara Biotherapeutics, Inc., scored.

ScoreInsiderValueHoldingsPrice contextFiled
50ModerateBrian N Cherry
director
buy
$1000k
104,166 shares
+167%-
23WeakYanina Grant-Huerta
Chief Accounting Officer
sell
$24k
1,804 shares
-5%+147% from low-27% from high
39WeakAnhCo Nguyen
President and CEO
sell
$38k
2,915 shares
-4%+147% from low-27% from high
23WeakYanina Grant-Huerta
Chief Accounting Officer
sell
$21k
1,809 shares
-5%+117% from low-36% from high
39WeakAnhCo Nguyen
President and CEO
sell
$34k
2,958 shares
-4%+117% from low-36% from high
48ModerateJames Huang
director, owner
buy
$670k
55,000 shares
+4%+132% from low-32% from high
35WeakJames Huang
director, owner
buy
$186k
19,335 shares
+1%+83% from low-46% from high
33WeakAnhCo Nguyen
President and CEO
sell
$22k
3,276 shares
-4%+29% from low-62% from high
23WeakYanina Grant-Huerta
Chief Accounting Officer
sell
$15k
2,218 shares
-6%+29% from low-62% from high
30WeakJill Henrich
EVP, Chief Regulatory Officer
sell
$7,410
1,059 shares
-5%-
37WeakEric J Hyllengren
EVP, CFO and COO
sell
$8,473
1,211 shares
-2%-
40ModerateAnhCo Nguyen
President and CEO
sell
$23k
3,331 shares
-4%-
40ModerateAnhCo Nguyen
President and CEO
sell
$19k
1,664 shares
-2%-
37WeakEric J Hyllengren
EVP, CFO and COO
sell
$15k
1,364 shares
-6%-
30WeakJill Henrich
EVP, Chief Regulatory Officer
sell
$11k
1,000 shares
-5%-

Transactions

The last 44 rows filed, every code.

DateInsiderTransactionSharesPriceValueHoldings afterFiled
Sep 4, 2026Brian N Cherry
director
POpen-market purchase
Common Stock
+104,166$9.60$1000k166,48638 d ago
Nov 28, 2025James Huang
director, owner
MOption exercise
Common Stockindirect: See Footnotes
+48,737$0.00$548,737Dec 1, 2025
Nov 28, 2025James Huang
director, owner
FTax withholding
Common Stockindirect: See Footnotes
-1$14.03$1448,736Dec 1, 2025
Nov 28, 2025James Huang
director, owner
MOption exercise
Warrantsderivativeindirect: See Footnotes
-48,737$6.61$322k259,163Dec 1, 2025
Nov 17, 2025Yanina Grant-Huerta
Chief Accounting Officer
SOpen-market sale
Common Stock
-1,645$13.19$22k33,613Nov 19, 2025
Nov 17, 2025AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-2,859$13.19$38k65,030Nov 19, 2025
Nov 17, 2025Yanina Grant-Huerta
Chief Accounting Officer
SOpen-market sale
Common Stock
-85$13.19$1,12133,528Nov 19, 2025
Nov 17, 2025AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-56$13.19$73964,974Nov 19, 2025
Nov 17, 2025Yanina Grant-Huerta
Chief Accounting Officer
SOpen-market sale
Common Stock
-74$13.19$97633,454Nov 19, 2025
Aug 18, 2025Yanina Grant-Huerta
Chief Accounting Officer
SOpen-market sale
Common Stock
-55$11.61$63937,012Aug 20, 2025
Aug 18, 2025AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-57$11.61$66270,790Aug 20, 2025
Aug 18, 2025Yanina Grant-Huerta
Chief Accounting Officer
SOpen-market sale
Common Stock
-86$11.61$99936,926Aug 20, 2025
Aug 18, 2025AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-1,281$11.62$15k69,509Aug 20, 2025
Aug 18, 2025Yanina Grant-Huerta
Chief Accounting Officer
SOpen-market sale
Common Stock
-1,668$11.61$19k35,258Aug 20, 2025
Aug 18, 2025AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-1,620$11.62$19k67,889Aug 20, 2025
Aug 15, 2025James Huang
director, owner
POpen-market purchase
Common Stockindirect: See Footnotes
+55,000$12.19$670k1,405,000Aug 19, 2025
Jul 17, 2025James Huang
director, owner
POpen-market purchase
Common Stockindirect: See Footnotes
+19,335$9.64$186k1,350,000Jul 21, 2025
Jun 10, 2025Carol Giltner Gallagher
director
AGrant or award
Common Stock
+7,828$0.00$033,012Jun 12, 2025
Jun 10, 2025Matthew K Fust
director
AGrant or award
Common Stock
+7,828$0.00$018,188Jun 12, 2025
Jun 10, 2025Pascal Touchon
director
AGrant or award
Common Stock
+7,828$0.00$077,955Jun 12, 2025
Jun 10, 2025Ameet Mallik
director
AGrant or award
Common Stock
+7,828$0.00$016,928Jun 12, 2025
Jun 10, 2025William K Heiden
director
AGrant or award
Common Stock
+7,828$0.00$022,188Jun 12, 2025
Jun 10, 2025Maria Grazia Roncarolo
director
AGrant or award
Common Stock
+7,828$0.00$017,368Jun 12, 2025
May 16, 2025AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-3,276$6.76$22k70,847May 20, 2025
May 16, 2025Yanina Grant-Huerta
Chief Accounting Officer
SOpen-market sale
Common Stock
-2,218$6.76$15k37,067May 20, 2025
May 16, 2025Adiumentum Capital Fund I LP
director, owner, other
AGrant or award
Common Stock
+75,572$6.61$500k1,209,395May 16, 2025
May 16, 2025Adiumentum Capital Fund I LP
director, owner, other
AGrant or award
Warrants (right to buy)derivative
+227,000$6.61$1.5M377,193May 16, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-1,900$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-460$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-496$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-154$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-381$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-350$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-262$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-543$0.00$0160Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-331$0.00$00Apr 2, 2025
Mar 31, 2025Eric J Hyllengren
EVP, CFO and COO
DDisposition to issuer
Employee Stock Option (Right to Buy)derivative
-8,961$0.00$02,656Apr 2, 2025
Mar 3, 2025Jill Henrich
EVP, Chief Regulatory Officer
SOpen-market sale
Common Stock
-1,059$7.00$7,41018,679Mar 5, 2025
Mar 3, 2025Eric J Hyllengren
EVP, CFO and COO
SOpen-market sale
Common Stock
-1,211$7.00$8,47356,231Mar 5, 2025
Mar 3, 2025AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-3,331$7.00$23k74,123Mar 5, 2025
Jan 27, 2025Eric J Hyllengren
EVP, CFO and COO
AGrant or award
Common Stock
+34,050$0.00$057,442Jan 29, 2025
Nov 18, 2024AnhCo Nguyen
President and CEO
SOpen-market sale
Common Stock
-1,664$11.20$19k77,454Nov 20, 2024
Nov 18, 2024Eric J Hyllengren
EVP, CFO and COO
SOpen-market sale
Common Stock
-1,364$11.20$15k23,392Nov 20, 2024
Nov 18, 2024Jill Henrich
EVP, Chief Regulatory Officer
SOpen-market sale
Common Stock
-1,000$11.20$11k19,378Nov 20, 2024

Insiders

Everyone who has filed a Form 4 here.

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

ATRA insider trading: Atara Biotherapeutics, Inc. | InsiderTell