ATRA 8-K: Second Quarter 2025 Financial Results Furnished as Exhibit 99.1

Rhea-AI Filing Summary

Atara Biotherapeutics reported that it announced financial results for the second quarter ended June 30, 2025 and furnished a press release as Exhibit 99.1 to its Form 8-K. The filing specifies the press release is being furnished (not "filed") and therefore is not subject to the liabilities of Sections 11 and 12(a)(2) of the Securities Act or deemed "filed" under Section 18 of the Exchange Act, and will not be incorporated by reference into other SEC filings unless expressly referenced. The Form lists the company ticker as ATRA and is signed by the Chief Accounting Officer.

Insights

Securities Analyst

TL;DR: The 8-K furnishes a Q2 results press release but contains no financial figures in the filing itself.

The filing confirms Atara has publicly announced second-quarter 2025 results via a press release attached as Exhibit 99.1. The Form explicitly treats the release as "furnished," which limits certain statutory liabilities. Because the 8-K text provided here does not include the underlying financial metrics or operational detail, this specific filing is informational and of limited standalone materiality; material impact depends on the contents of Exhibit 99.1.

Corporate Governance Expert

TL;DR: The Form emphasizes legal treatment of the press release (furnished, not filed), which is standard disclosure practice.

The company follows common practice by furnishing its earnings release and stating it is not "filed" for purposes of certain Exchange Act and Securities Act liabilities. The filing includes an authorized signature from the Chief Accounting Officer, indicating appropriate officer-level attestation for the disclosure. There are no governance changes or additional corporate actions disclosed in this 8-K.

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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): August 11, 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

(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 2.02 Results of Operations and Financial Condition.

On August 11, 2025, the Company announced certain financial results for the second quarter ended June 30, 2025. A copy of the Company’s press release, titled “Atara Biotherapeutics Announces Second Quarter Financial Results and Operational Progress” is furnished as Exhibit 99.1 hereto.

The information set forth in this Item 2.02 and in the press release included as Exhibit 99.1 shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of Section 11 and 12(a)(2) of the Securities Act of 1933, as amended, and shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission, whether made before or after the date hereof, except as shall be expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.		Description
99.1		Press Release, dated August 11, 2025
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:	August 11, 2025	By:	/s/ Yanina Grant-Huerta
			Yanina Grant-Huerta Chief Accounting Officer (Duly Authorized Officer and Principal Financial and Accounting Officer)

FAQ

What did Atara Biotherapeutics (ATRA) disclose in this Form 8-K?

Atara disclosed it announced financial results for the quarter ended June 30, 2025 and furnished the related press release as Exhibit 99.1 to the Form 8-K.

Does the 8-K include the actual financial figures for Q2 2025?

No. The 8-K text states the company announced certain financial results and furnished a press release, but the filing itself does not include the financial numbers.

Is the press release considered "filed" with the SEC?

No. The filing explicitly states the press release is being "furnished," not "filed," and therefore is not subject to specified statutory liabilities or automatically incorporated by reference into other filings.

Where is the press release referenced in the 8-K?

The press release is attached as Exhibit 99.1 to the Form 8-K.

Who signed the Form 8-K for Atara Biotherapeutics?

Yanina Grant-Huerta, Chief Accounting Officer, signed the filing as the duly authorized officer.