AnhCo Nguyen - 18 Aug 2025 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
18 Aug 2025
Net transactions value
-$34,360
Form type
4
Filing time
20 Aug 2025, 16:11:40 UTC
Previous filing
20 May 2025
Next filing
19 Nov 2025
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 20 Aug 2025 0001977970

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ATRA Common Stock Sale $662 -57 -0.08% $11.61 70,790 18 Aug 2025 Direct F1, F2
transaction ATRA Common Stock Sale $14,879 -1,281 -1.8% $11.62 69,509 18 Aug 2025 Direct F1, F2
transaction ATRA Common Stock Sale $18,820 -1,620 -2.3% $11.62 67,889 18 Aug 2025 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 August 18, 2025 on behalf of a group of employees of the Issuer to satisfy the payment of withholding tax liability of such employees.