Yanina Grant-Huerta - Mar 31, 2025 Form 3 Insider Report for Atara Biotherapeutics, Inc. (ATRA)

Role
Chief Accounting Officer
Signature
/s/ John Chao, Attorney-in-Fact for Yanina Grant-Huerta
Stock symbol
ATRA
Transactions as of
Mar 31, 2025
Transactions value $
$0
Form type
3
Date filed
4/10/2025, 07:14 PM
SEC
View on sec.gov

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding ATRA Common Stock 39.3K Mar 31, 2025 Direct F1, F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding ATRA Employee Stock Option (Right to Buy) Mar 31, 2025 Common Stock 800 $198.00 Direct
holding ATRA Employee Stock Option (Right to Buy) Mar 31, 2025 Common Stock 1.1K $97.75 Direct
holding ATRA Employee Stock Option (Right to Buy) Mar 31, 2025 Common Stock 550 $97.75 Direct F3
holding ATRA Employee Stock Option (Right to Buy) Mar 31, 2025 Common Stock 275 $11.00 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Includes an aggregate 33,840 restricted stock units ("RSUs"), which are comprised of: (i) 51 RSUs that vest on November 15, 2025; (ii) 3,614 RSUs that vest as to 1/4th of the shares on May 15, 2025, and each of the next three (3) Quarterly Vesting Dates (as defined herein); (iii) 1,125 RSUs that vest as to 1/5th of the shares on May 15, 2025, and each of the next four (4) Quarterly Vesting Dates; and (iv) 29,050 RSUs that vest as to 1/8th of the shares on May 15, 2025, and each of the next seven (7) Quarterly Vesting Dates, each of which is subject to the reporting person's continuous service.
F2 "Quarterly Vesting Date" means March 1, May 15, August 15, and November 15 of each year, provided that if such date falls on a weekend or holiday, the "Quarterly Vesting Date" shall be the first (1st) business day after such date.
F3 1/12th of the shares subject to the stock option vested and became exercisable on April 1, 2025, and the remaining shares vest in equal monthly installments over the following eleven (11) months, subject to the reporting person's continuous service.

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney