8-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

    Date of Report (Date of earliest event reported): March 03, 2025

   

Atara Biotherapeutics, Inc.

(Exact name of Registrant as Specified in Its Charter)


Delaware	001-36548	46-0920988
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

1280 Rancho Conejo Blvd
Thousand Oaks, California		91320
(Address of Principal Executive Offices)		(Zip Code)

    Registrant’s Telephone Number, Including Area Code: (805) 623-4211

   

Conejo Spectrum Street, Unit 200

   

    Thousand Oaks, California 91320

   

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	ATRA	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.05 Costs Associated with Exit or Disposal Activities.

On March 3, 2025, the Company announced a reduction in its workforce that will impact approximately 50% of its current employees following the Company’s decision to discontinue all development activities for ATA3219 and ATA3431, including all CAR T clinical studies evaluating ATA3219 and pause both ATA3219 and ATA3431 programs. The Company expects to substantially complete the workforce reduction by June 2025. The Company expects to recognize approximately $3.0 million in total for severance and related benefits for employees laid off under the reduction in force. These charges are primarily one-time termination benefits and are primarily cash charges. The Company may also incur other charges or cash expenditures not currently contemplated due to events that may occur as a result of, or associated with, the workforce reduction. Additional details will be provided in the Company’s Quarterly Report on Form 10-Q for the period ending March 31, 2025.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.


Exhibit No.		Description

104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


			ATARA BIOTHERAPEUTICS, INC.

Date:	March 3, 2025	By:	/s/ Eric Hyllengren
			Eric Hyllengren Chief Financial Officer and Chief Operating Officer (Duly Authorized Officer and Principal Financial and Accounting Officer)