Citadel Advisors Llc - Nov 26, 2025 SCHEDULE 13G Report for Boundless Bio, Inc. Common stock, par value $0.0001 per share (the "Shares") (BOLD)

Filing Manager
CITADEL ADVISORS LLC
Reporting Manager
Kenneth Griffin
Security
Boundless Bio, Inc. Common stock, par value $0.0001 per share (the "Shares")
Symbol
BOLD
Shares outstanding
22.4M shares
Disclosed Ownership
1.43M shares
Ownership
6.4%
Form type
SCHEDULE 13G
Date filed
12/4/2025, 06:35 PM
Date of event
Nov 26, 2025
SEC
View on sec.gov

Reporting Managers (7)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Citadel Advisors LLC 3.7% 831K 0 831K /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Advisors Holdings LP 3.7% 831K 0 831K /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel GP LLC 3.7% 831K 0 831K /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Securities LLC 2.7% 602K 0 602K /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Securities Group LP 2.7% 602K 0 602K /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Securities GP LLC 2.7% 602K 0 602K /s/ Seth Levy Seth Levy, Authorized Signatory
Kenneth Griffin 6.4% 1.43M 0 1.43M /s/ Seth Levy Seth Levy, attorney-in-fact*