Boundless Bio furnishes Q3 2025 results via 8-K; Exhibit 99.1 attached

Rhea-AI Filing Summary

Boundless Bio (BOLD) furnished an 8‑K announcing it issued a press release with financial results for the quarter ended September 30, 2025. The press release is attached as Exhibit 99.1 and incorporated by reference. Consistent with General Instruction B.2, the information in this report, including Exhibit 99.1, is being furnished and not filed under the Exchange Act. The filing also lists the Cover Page Interactive Data File as Exhibit 104.

8-K Event Classification

2 items: 2.02, 9.01

2 items

Item 2.02 Results of Operations and Financial Condition Financial

Disclosure of earnings results, typically an earnings press release or preliminary financials.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

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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): November 05, 2025

Boundless Bio, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Delaware			001-41989	83-0751369
(State or Other Jurisdiction of Incorporation)			(Commission File Number)	(IRS Employer Identification No.)
10955 Alexandria Way, Suite 100,
San Diego, California				92121
(Address of Principal Executive Offices)				(Zip Code)

Registrant’s Telephone Number, Including Area Code: (858) 766-9912

N/A

(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		BOLD		Nasdaq Global Select Market

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 November 5, 2025, Boundless Bio, Inc. (the Company) issued a press release announcing its financial results for the quarter ended September 30, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

In accordance with General Instruction B.2 of Form 8-K, the information in this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the Exchange Act), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof and regardless of any general incorporation by reference language in any such filing, unless the Company specifically states in such filing that such information, or a portion thereof, is to be considered “filed” rather than furnished or incorporated by reference therein.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit Number		Description
99.1		Press Release Issued on November 5, 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.

			BOUNDLESS BIO, INC.
Date:	November 5, 2025	By:	/s/ Jessica Oien
			Name: Jessica Oien Title: Chief Legal Officer and Corporate Secretary

FAQ

What did Boundless Bio (BOLD) announce in this 8-K?

The company furnished a press release with financial results for the quarter ended September 30, 2025.

Where can I find the detailed Q3 2025 results for BOLD?

Details are in the attached Exhibit 99.1, the press release referenced in the filing.

Is the information in the BOLD 8-K filed or furnished?

It is furnished, not filed, under General Instruction B.2 of the applicable rules.

What exhibits are included with the Boundless Bio 8-K?

The filing includes Exhibit 99.1 (press release) and Exhibit 104 (Cover Page Inline XBRL data file).

What period do the results cover for Boundless Bio (BOLD)?

The results cover the quarter ended September 30, 2025.

When was the press release issued by Boundless Bio?

The press release was issued on November 5, 2025.