AnhCo Nguyen - 02 Mar 2026 Form 4 Insider Report for Atara Biotherapeutics, Inc. (ATRA)

Role
President and CEO, Director
Signature
/s/ John Chao, Attorney-in-Fact for AnhCo Nguyen
Issuer symbol
ATRA
Transactions as of
02 Mar 2026
Net transactions value
-$15,237
Form type
4
Filing time
04 Mar 2026, 16:28:09 UTC
Previous filing
19 Nov 2025
Next filing
11 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Nguyen AnhCo President and CEO, Director C/O ATARA BIOTHERAPEUTICS, INC., 1280 RANCHO CONEJO BOULEVARD, THOUSAND OAKS /s/ John Chao, Attorney-in-Fact for AnhCo Nguyen 04 Mar 2026 0001977970

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ATRA Common Stock Sale $1,006 -198 -0.3% $5.08 64,776 02 Mar 2026 Direct F1, F2
transaction ATRA Common Stock Sale $295 -58 -0.09% $5.08 64,718 02 Mar 2026 Direct F1, F2
transaction ATRA Common Stock Sale $6,602 -1,298 -2% $5.09 63,420 02 Mar 2026 Direct F1, F2
transaction ATRA Common Stock Sale $7,335 -1,442 -2.3% $5.09 61,978 02 Mar 2026 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Shares sold automatically to satisfy tax withholding obligations in connection with the vesting of previously granted restricted stock units, pursuant to a sale-to-cover provision in the award agreement.
F2 The sale price of the reporting person's shares represents the weighted average price of all shares sold by a broker on March 2, 2026 on behalf of a group of employees of the Issuer to satisfy the payment of withholding tax liability of such employees.