Form 4 - Statement of changes in beneficial ownership of securities:
SEC Accession No. 0001104659-25-097921
Filing Date
2025-10-08
Accepted
2025-10-08 16:15:17
Documents
1
Period of Report
2025-10-06

Document Format Files

Seq Description Document Type Size
1 OWNERSHIP DOCUMENT tm2528311-1_4seq1.html 4  
1 OWNERSHIP DOCUMENT tm2528311-1_4seq1.xml 4 12427
  Complete submission text file 0001104659-25-097921.txt   16297
Mailing Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428
Business Address
Harwin Peter Evan (Reporting) CIK: 0001663607 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-40544 | Film No.: 251382471

Mailing Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428
Business Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 (267) 760-4066
Fairmount Healthcare Fund II L.P. (Reporting) CIK: 0001769651 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 4 | Act: 34 | File No.: 001-40544 | Film No.: 251382474

Mailing Address 221 CRESCENT ST. BUILDING 23, SUITE 105 WALTHAM MA 02453
Business Address 221 CRESCENT ST. BUILDING 23, SUITE 105 WALTHAM MA 02453 (781) 312-3013
Jade Biosciences, Inc. (Issuer) CIK: 0001798749 (see all company filings)

EIN.: 831377888 | State of Incorp.: DE | Fiscal Year End: 1231
SIC: 2834 Pharmaceutical Preparations
(CF Office: 03 Life Sciences)

Mailing Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428
Business Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 267-262-5300
Fairmount Funds Management LLC (Reporting) CIK: 0001802528 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 4 | Act: 34 | File No.: 001-40544 | Film No.: 251382475

Mailing Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428
Business Address
Kiselak Tomas (Reporting) CIK: 0001830177 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-40544 | Film No.: 251382472

Mailing Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428
Business Address 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 267-262-5300
Fairmount Healthcare Co-Invest IV L.P. (Reporting) CIK: 0002042283 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 4 | Act: 34 | File No.: 001-40544 | Film No.: 251382473