INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Grant-Huerta Yanina

(Last)

(First)

(Middle)

C/O ATARA BIOTHERAPEUTICS, INC.

1280 RANCHO CONEJO BOULEVARD

(Street)

THOUSAND OAKS

91320

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
03/31/2025

3. Issuer Name and Ticker or Trading Symbol
Atara Biotherapeutics, Inc. [ ATRA ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
Chief Accounting Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

**Table I - Non-Derivative Securities Beneficially Owned**
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	39,285⁽¹⁾⁽²⁾	D

**Table II - Derivative Securities Beneficially Owned**
**(e.g., puts, calls, warrants, options, convertible securities)**
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Employee Stock Option (Right to Buy)	04/06/2024	04/30/2030	Common Stock	800	198	D
Employee Stock Option (Right to Buy)	03/01/2025	02/28/2033	Common Stock	1,100	97.75	D
Employee Stock Option (Right to Buy)	⁽³⁾	02/28/2033	Common Stock	550	97.75	D
Employee Stock Option (Right to Buy)	07/31/2024	01/05/2034	Common Stock	275	11	D

Explanation of Responses:

1. 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.

2. "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.

3. 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

	/s/ John Chao, Attorney-in-Fact for Yanina Grant-Huerta	04/10/2025
	** Signature of Reporting Person	Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.