Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Nguyen AnhCo

2. Date of Event Requiring Statement (MM/DD/YYYY) 6/1/2023

3. Issuer Name and Ticker or Trading Symbol

Atara Biotherapeutics, Inc. [ATRA]

(Last) (First) (Middle)

C/O ATARA BIOTHERAPEUTICS, INC., 2380 CONEJO SPECTRUM STREET, SUITE 200

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

_____ Director _____ 10% Owner
___X___ Officer (give title below) _____ Other (specify below)
EVP, Chief Sci. & Tech Officer /

(Street)

THOUSAND OAKS, CA 91320

(City) (State) (Zip)

5. If Amendment, Date Original Filed(MM/DD/YYYY)

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	301125 ⁽¹⁾⁽²⁾	D

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Employee Stock Option (Right to Buy)	5/10/2023	5/9/2031	Common Stock	87124	$13.24	D
Employee Stock Option (Right to Buy)	⁽³⁾	5/9/2031	Common Stock	87125	$13.24	D
Employee Stock Option (Right to Buy)	6/1/2023	2/29/2032	Common Stock	35048	$10.21	D
Employee Stock Option (Right to Buy)	⁽⁴⁾	2/29/2032	Common Stock	77108	$10.21	D
Employee Stock Option (Right to Buy)	6/1/2023	2/28/2033	Common Stock	28907	$3.91	D
Employee Stock Option (Right to Buy)	⁽⁴⁾	2/28/2033	Common Stock	317988	$3.91	D

Explanation of Responses:
(1)	Includes an aggregate 270,072 restricted stock units ("RSUs"), which are comprised of: (i) 57,724 RSUs that vest as to 1/8th of shares on August 15, 2023 and each of the next seven (7) Quarterly Vesting Dates (as defined herein); (ii) 41,020 RSUs that vest as to 1/11th of shares on August 15, 2023 and each of the next ten (10) Quarterly Vesting Dates; (iii) 30,000 RSUs that vest as to 1/2nd of shares on August 15, 2023 and 1/2nd on August 15, 2024; and (iv) 141,328 RSUs that vest as to 1/11th of shares on August 15, 2023 and each of the next ten (10) 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)	1/24th of shares subject to the stock option vest and become exercisable on June 10, 2023, and the remaining shares vest in equal monthly installments over the following twenty-three (23) months, subject to the reporting person's continuous service.
(4)	1/33rd of shares subject to the stock option vest and become exercisable on July 1, 2023, and the remaining shares vest in equal monthly installments over the following thirty-two (32) months, subject to the reporting person's continuous service.

Remarks:
Exhibit 24 - Power of Attorney

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Nguyen AnhCo C/O ATARA BIOTHERAPEUTICS, INC. 2380 CONEJO SPECTRUM STREET, SUITE 200 THOUSAND OAKS, CA 91320			EVP, Chief Sci. & Tech Officer

Signatures
/s/ Jeff Kiekhofer, Attorney-in-Fact for AnhCo Nguyen		6/9/2023
^**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 control number.