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ATRA · Current Report (Form 8-K) · Filed May 12, 2026

Atara Biotherapeutics Inc — Current Report (Form 8-K)

Form
8-K
Filed
May 12, 2026
Period
May 12, 2026
Ticker
ATRA
Accession
0001193125-26-219420
Atara Biotherapeutics Inc on Boardroom AlphaView on SEC EDGAR
Boardroom Alpha · Filing insights

Consult the attached press release for more details.

About Atara Biotherapeutics Inc
Market cap
$89M
1Y TSR
+7.0%
3Y TSR
−41.6%
Board grade
C
Sector
Healthcare
CEO
Anhco Nguyen
Last annual meeting: Jun 9, 2026 · View full Atara Biotherapeutics Inc profile →
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): May 12, 2026

 

 

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 May 12, 2026, the Company announced certain financial results for the first quarter ended March 31, 2026. A copy of the Company’s press release, titled “Atara Biotherapeutics Announces First Quarter 2026 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 May 12, 2026

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:

May 12, 2026

By:

/s/ Yanina Grant-Huerta

 

 

 

Yanina Grant-Huerta
Chief Accounting Officer (Duly Authorized Officer and Principal Financial and Accounting Officer)

 

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Reference

Frequently asked questions

When did Atara Biotherapeutics Inc file this 8-K?
Atara Biotherapeutics Inc (ATRA) filed this Current Report (Form 8-K) with the SEC on May 12, 2026. The accession number assigned by EDGAR is 0001193125-26-219420.
What does an 8-K disclose?
Form 8-K is the SEC's current-report form, used to disclose material events between periodic reports (10-K / 10-Q). Triggers include CEO/CFO departures, acquisitions, bankruptcies, earnings releases, auditor changes, changes in fiscal year, and amendments to corporate governance. Each 8-K is keyed to one or more Item numbers (1.01 through 9.01).
What is the key takeaway from this filing?
Consult the attached press release for more details. This is Boardroom Alpha's one-line summary of the current report; see the full filing text above for the formal disclosure.
What Item codes does an 8-K cover?
An 8-K's Item codes (1.01 through 9.01) specify what kind of event is being disclosed — e.g. Item 1.01 for entering a material agreement, Item 5.02 for departure/election of directors and executive officers, Item 8.01 for other events. The Item codes for this 8-K appear in the filing text above.
Where can I find Atara Biotherapeutics Inc's prior current reports on EDGAR?
The SEC EDGAR browser lists every 8-K Atara Biotherapeutics Inc has filed under CIK 1604464, sortable by date. Use the "View on SEC EDGAR" link in the page header, or browse directly via https://www.sec.gov/cgi-bin/browse-edgar.
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