13F

Stock

MBX Biosciences, Inc.

MBX · held by 7 managers

Reported value

$3.12M

Holders

7

+0 new · −0 exited

Holders’ est. mark

$131.7K

Price effect on 2 books still in the name

Largest holder

$1.49M

Hudson Bay Capital Management LP

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
Hudson Bay Capital Management LP85K$1.49MHeld
MORGAN STANLEY44.9K$785.2KHeld
BANK OF AMERICA CORP /DE/26.6K$465.8KHeld
BARCLAYS PLC21.6K$378.5K$131.7KCut−$289.5K
Allworth Financial LP25$438Held
Essential Partners LLC2$35$12Added$12
FNY Investment Advisers, LLC1.57K$27Held

Positions as of Q3 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.