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Disclosery

BOLD BOUNDLESS BIO INC

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COM (common), issuer CIK 1782303

34 managers (36 13F filers) reported a position in BOLD shares at 2026-03-31, 8,485,823 shares in all. 4 filers opened a position and 6 filers sold out during the quarter.

Managers
34
13F filers
36
New
4
Added
6
Reduced
10
Sold out
6
Shares held by filers
8,485,823

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
FMR LLCin group FMR LLC2,695,455$2.96M<0.01%+11,43313F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC1,342,131$1.48M<0.01%-11,77313F-HRTimelineGroup
SECTORAL ASSET MANAGEMENT INC678,574$746K0.62%013F-HRTimeline
VANGUARD GROUP INCgroup of 3 filers holding662,757$729KnewTimeline
Stonepine Capital Management, LLC597,682$657K0.58%-112,38913F-HRTimeline
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…556,233$612K<0.01%013F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC399,000$439K<0.01%+57,60013F-HRTimeline
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.300,000$330K<0.01%013F-HRTimelineGroup
RBF Capital, LLC200,000$220K0.01%013F-HR/ATimeline
Ensign Peak Advisors, Inc187,500$206K<0.01%013F-HR/ATimeline
Sio Capital Management, LLC163,679$180K0.03%013F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC127,576$140K<0.01%+33,47813F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC99,875$110K<0.01%-35,53513F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP96,824$107K0.01%+34,34813F-HRTimeline
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.in group LANDSCAPE CAPITAL MANAGEMENT,…85,792$94.4K0.01%-41,83413F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.70,675$77.7K<0.01%+3,62713F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC50,500$55.5K<0.01%013F-HRTimeline
Walleye Capital LLCin group Walleye Capital LLC39,624$43.6K<0.01%013F-HR/ATimelineGroup
XTX Topco Ltdin group XTX Topco Ltd34,671$38.1K<0.01%-4,90613F-HRTimelineGroup
Qube Research & Technologies Ltd17,492$19.2K<0.01%-1,21513F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC16,374$18K<0.01%new13F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP15,962$17.6K<0.01%013F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY13,000$14.3K<0.01%013F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC12,610$12K<0.01%013F-HRTimelineGroup
Pure Financial Advisors, LLC10,100$11.1K<0.01%new13F-HRTimeline
CITIGROUP INCin group CITIGROUP INC8,837$9.72K<0.01%-16,23613F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,371$2.61K<0.01%-3,43213F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS178$196<0.01%+213F-HRTimelineGroup
Optiver Holding B.V.in group Optiver Holding B.V.168$185<0.01%013F-HR/ATimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO169$183<0.01%013F-HR/ATimelineGroup
CWM, LLCin group CWM, LLC8$9<0.01%-113F-HRTimelineGroup
Caitong International Asset Management …3$3<0.01%new13F-HRTimeline
UBS Group AGin group UBS Group AG2$2<0.01%-2113F-HRTimelineGroup
SBI Securities Co., Ltd.1$1<0.01%new13F-HRTimeline