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Boundless Bio Inc

For the period ended Jun 23, 2025. Filed Apr 29, 2025.

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About this filing

What shareholders are asked to vote on at a company's meeting. It is where to find what directors and top executives are paid, and who owns the most shares.

Jun 23, 2025 · Filed Apr 29, 2025

BOLD$2.46+2.1%Stored close · as of Nov 6, 2026
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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Filed by the Registrant☒

Filed by a Party other than the Registrant☐

Check the appropriate box:

☐Preliminary Proxy Statement
☐Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☒Definitive Proxy Statement
☐Definitive Additional Materials
☐Soliciting Material under §240.14a-12

BOUNDLESS BIO, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☒No fee required
☐Fee paid previously with preliminary materials
☐Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

Boundless Bio, Inc.

10955 Alexandria Way, Suite 100

San Diego, CA 92121

Notice of Annual Meeting of Stockholders

To be held on June 23, 2025

Dear Stockholder:

Notice is hereby given that the 2025 Annual Meeting of Stockholders of Boundless Bio, Inc., a Delaware corporation, will be held on Monday, June 23, 2025 at 8:00 a.m. Pacific Time for the following purposes, as more fully described in the accompanying proxy statement:

to elect Christine Brennan, Ph.D. and Nancy Whiting, Pharm.D. as Class I directors to hold office until our 2028 annual meeting of stockholders;

to ratify the appointment of KPMG LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2025; and

to transact any other business properly brought before the meeting.

The record date for the meeting is April 25, 2025. Only stockholders of record at the close of business on the record date, or their legal proxy holders, are entitled to notice of and vote at the meeting.

The meeting will be held entirely online via live audio webcast. Please visit www.proxydocs.com/BOLD for more details. You may register to attend the meeting at www.proxydocs.com/BOLD. You will be able to vote online during the meeting as further described beginning on page 2 of the accompanying proxy statement. You will need the control number included on your Notice of Internet Availability of Proxy Materials, your proxy card, or on the instructions that accompanied your proxy materials to attend the meeting. If your shares are held in “street name,” you should contact your bank, broker, or other organization that holds your shares to obtain your control number to attend the meeting. Stockholders and proxy holders attending the meeting online will be deemed to be present in person.

By Order of the Board of Directors,

/s/ Jessica Oien

Jessica Oien

Chief Legal Officer

San Diego, California

May 6, 2025

Please vote your shares promptly to help ensure the presence of a quorum at the meeting. You may vote your shares over the Internet or via a toll-free telephone number. If you received a paper copy of a proxy or voting instruction card by mail, you may submit your proxy or voting instruction card by completing, signing, dating, and returning it. Please follow the instructions in the accompanying proxy statement to vote.

TABLE OF CONTENTS

Page
GENERAL INFORMATION ABOUT THE MEETING1
SUMMARY OF MATTERS TO BE VOTED ON1
QUESTIONS AND ANSWERS ABOUT THE ANNUAL MEETING AND VOTING2
BOARD OF DIRECTORS7
CORPORATE GOVERNANCE10
EXECUTIVE OFFICERS15
EXECUTIVE COMPENSATION AND OTHER INFORMATION16
SECURITIES AUTHORIZED FOR ISSUANCE UNDER EQUITY COMPENSATION PLANS25
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT26
CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS29
REPORT OF THE AUDIT COMMITTEE OF THE BOARD31
PROPOSAL 1 ELECTION OF DIRECTORS32
PROPOSAL 2 RATIFICATION OF APPOINTMENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM33
OTHER MATTERS34
SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE34

PROXY STATEMENT

2025 ANNUAL MEETING OF STOCKHOLDERS

To be held on June 23, 2025

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.