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Boundless Bio, Inc.

For the period ended Dec 31, 2024. Filed Mar 27, 2025.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2024 · Filed Mar 27, 2025

BOLD$2.460.0%Stored close · as of Nov 9, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Item 9B. Other Information

Rule 10b5-1 Trading Arrangements

From time to time, our officers (as defined in Rule 16a-1(f) of the Exchange Act) and directors may enter into Rule 10b5-1 or non-Rule 10b5-1 trading arrangements (as each such term is defined in Item 408 of Regulation S-K). During the three months ended December 31, 2024, our officers or directors adopted, modified, or terminated such trading arrangements as set forth below.

Action · Date · Trading Arrangement
Rule 10b5-1* · Non-Rule 10b5‑1** · Total Shares Subject to Plan · Expiration Date
David Hinkle,Senior Vice President, Finance, Controller and TreasurerAdoptDecember 27, 2024X12,000(1)December 31, 2025(2)
Jami Rubin,former Chief Financial Officer(3)TerminateOctober 18, 2024X9,000(4)Not applicable
____________________* Intended to satisfy the affirmative defense of Rule 10b5-1(c)** Not intended to satisfy the affirmative defense of Rule 10b5-1(c)

(1)In addition, 100% of shares purchased in 2025 after the date of this report pursuant to Mr. Hinkle’s participation in our ESPP are also subject to this trading plan.(2)This trading plan may expire earlier if all transactions under the trading plan are completed before the scheduled expiration date.(3)Ms. Rubin’s employment terminated effective October 11, 2024.(4)No sales occurred pursuant to this trading plan prior to its termination.

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