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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1782303	Boundless Bio Inc.	BOLD	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1315082	Ra Capital Healthcare Fund Lp	200 Berkeley Street Boston MA 02116	No	No	Yes	No
1346824	Ra Capital Management, L.p.	200 Berkeley Street Boston MA 02116	No	No	No	No
1384859	Peter Kolchinsky	C/O Ra Capital Management, L.p. 200 Berkeley Street Boston MA 02116	No	No	Yes	No
1619841	M. Rajeev Shah	Ra Capital Management, L.p. 200 Berkeley Street, 18Th Floor Boston MA 02116	No	No	Yes	No
1825376	Ra Capital Nexus Fund Ii, L.p.	200 Berkeley Street Boston MA 02116	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2024-04-02	1,587,912	$0.00	1,587,912	No	4	C	Indirect	See footnotes
Common Stock	Acquisiton	2024-04-02	296,875	$16.00	1,884,787	No	4	P	Indirect	See footnotes
Common Stock	Acquisiton	2024-04-02	280,219	$0.00	280,219	No	4	C	Indirect	See footnotes
Common Stock	Acquisiton	2024-04-02	15,625	$16.00	295,844	No	4	P	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See footnotes
No	4	P	Indirect	See footnotes
No	4	C	Indirect	See footnotes
No	4	P	Indirect	See footnotes

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Preferred Stock	Disposition	2024-04-02	17,000,000	$0.00	871,794	$0.00
Common Stock	Series B Preferred Stock	Disposition	2024-04-02	3,000,000	$0.00	153,846	$0.00
Common Stock	Series C Preferred Stock	Disposition	2024-04-02	13,964,285	$0.00	716,118	$0.00
Common Stock	Series C Preferred Stock	Disposition	2024-04-02	2,464,286	$0.00	126,373	$0.00

Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect

Footnotes

On April 2, 2024, each share of Series B Preferred Stock and Series C Preferred Stock automatically converted into shares of Common Stock on a 19.5-for-1 basis immediately prior to the closing of the Issuer's initial public offering. The shares of Series B Preferred Stock and Series C Preferred Stock had no expiration date.
Held directly by RA Capital Healthcare Fund, L.P. (the "Fund").
RA Capital Management, L.P. (the "Adviser") is the investment manager for the Fund and RA Capital Nexus Fund II, L.P. (the "Nexus Fund II"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, Dr. Kolchinsky, and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.
Held directly by the Nexus Fund II.