13F

Stock

Upstream Bio, Inc.

UPB · held by 2 managers

Reported value

$6.09M

Holders

2

+0 new · −0 exited

Holders’ est. mark

−$257.9K

Price effect on 1 books still in the name

Largest holder

$5.94M

NORGES BANK

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
NORGES BANK969.9K$5.94MHeld
BARCLAYS PLC25K$153K−$257.9KCut−$291.2K

Positions as of Q1 2025. 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.