Fairmount Funds Management LLC - Apr 28, 2025 SCHEDULE 13D Report for Jade Biosciences, Inc. Common Stock, $0.0001 par value

Filing Manager
Fairmount Funds Management LLC
Reporting Manager
Fairmount Funds Management LLC
Security
Jade Biosciences, Inc. Common Stock, $0.0001 par value
Shares outstanding
36.3M shares
Disclosed Ownership
7.25M shares
Ownership
20%
Form type
SCHEDULE 13D
Date filed
5/1/2025, 06:31 PM
Date of event
Apr 28, 2025
Next filing
Oct 8, 2025
SEC
View on sec.gov

Reporting Managers (5)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Fairmount Funds Management LLC 19.99% 7.25M 0 7.25M /s/ Peter Harwin Peter Harwin, Managing Member 0001802528
Fairmount Healthcare Fund II L.P. 12.66% 4.59M 0 4.59M /s/ Peter Harwin Peter Harwin, Managing Member 0001769651
Fairmount Healthcare Co-Invest IV L.P. 8.24% 2.66M 0 2.66M /s/ Peter Harwin Peter Harwin, Managing Member 0002042283
Peter Evan Harwin 19.99% 7.25M 0 7.25M /s/ Peter Harwin Peter Harwin 0001663607
Tomas Kiselak 19.99% 7.25M 0 7.25M /s/ Tomas Kiselak Tomas Kiselak 0001830177