13F

Stock

Boundless Bio, Inc.

BOLD · held by 36 managers

Reported value

$9.21M

Holders

36

+4 new · −6 exited

Holders’ est. mark

−$758.1K

Price effect on 29 books still in the name

Largest holder

$2.96M

Fidelity

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
Fidelity2.7M$2.96M−$268.4KCut−$255.8K
Citadel1.34M$1.48M−$134.2KCut−$148.3K
SECTORAL ASSET MANAGEMENT INC678.6K$746.4K−$67.9KCut−$67.9K
Stonepine Capital Management, LLC597.7K$657.5K−$59.8KCut−$194.6K
VANGUARD CAPITAL MANAGEMENT LLC597.2K$656.9KHeld
WELLINGTON MANAGEMENT GROUP LLP556.2K$611.9K−$55.6KCut−$55.6K
Renaissance Technologies399K$438.9K−$34.1KAdded$29.2K
Alyeska Investment Group, L.P.300K$330K−$30KCut−$30K
RBF Capital, LLC200K$220K−$20KCut−$20K
Ensign Peak Advisors, Inc187.5K$206.3K−$18.7KCut−$18.8K
Sio Capital Management, LLC163.7K$180K−$16.4KCut−$16.4K
GEODE CAPITAL MANAGEMENT, LLC127.6K$140.3K−$9.41KAdded$27.4K
MILLENNIUM MANAGEMENT LLC99.9K$109.9K−$9.99KCut−$52.6K
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.85.8K$94.4K−$8.58KCut−$58.8K
BlackRock, Inc.70.7K$77.7K−$6.7KCut−$2.71K
VANGUARD FIDUCIARY TRUST CO65.1K$71.7KHeld
BRIDGEWAY CAPITAL MANAGEMENT, LLC50.5K$55.5K−$5.05KCut−$5.05K
Walleye Capital LLC39.6K$43.6K−$3.96KCut−$3.96K
XTX Topco Ltd34.7K$38.1K−$3.47KCut−$9.35K
Qube Research & Technologies Ltd17.5K$19.2K−$1.75KCut−$3.21K
Squarepoint Ops LLC16.4K$18KNew
State Street16K$17.6K−$1.6KCut−$1.6K
MORGAN STANLEY13K$14.3K−$1.3KCut−$1.3K
Pure Financial Advisors, LLC10.1K$11.1KNew
CITIGROUP INC8.84K$9.72K−$884Cut−$20.4K
Tower Research Capital LLC (TRC)2.37K$2.61K−$237Cut−$4.36K
Vanguard Global Advisers, LLC429$472Held
BNP PARIBAS FINANCIAL MARKETS178$196−$17Cut−$15
Optiver Holding B.V.168$185−$17Cut−$17
JPMORGAN CHASE & CO169$183−$20Cut−$20
GSA CAPITAL PARTNERS LLP96.8K$107−$6Added$32
ACADIAN ASSET MANAGEMENT LLC12.6K$12−$2Cut−$2
CWM, LLC8$9$9Added$9
Caitong International Asset Management Co., Ltd3$3New
UBS Group AG2$2−$0Cut−$25
SBI Securities Co., Ltd.1$1New

Who left

Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.