Quick Takeaways
- Fairmount Funds Management LLC filed SCHEDULE 13D/A for Jade Biosciences, Inc. Common Stock, $0.0001 par value (JBIO).
- Disclosed ownership: 20%.
- Date of event: 06 Oct 2025.
Fairmount Funds Management LLC - 06 Oct 2025 SCHEDULE 13D/A Report for Jade Biosciences, Inc. Common Stock, $0.0001 par value (JBIO)
- Filing Manager
- Fairmount Funds Management LLC
- Reporting Manager
- Fairmount Funds Management LLC
- Symbol
- JBIO
- Shares outstanding
- 51,795,273 shares
- Disclosed Ownership
- 10,353,875 shares
- Ownership
- 20%
- Form type
- SCHEDULE 13D/A
- Filing time
- 08 Oct 2025, 16:15:29 UTC
- Date of event
- 06 Oct 2025
- Previous filing
- 01 May 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Fairmount Funds Management LLC disclosed 20% ownership in Jade Biosciences, Inc. Common Stock, $0.0001 par value (JBIO) on 06 Oct 2025."
What Changed
- Previous schedule filing date: 01 May 2025.
- Current filing was accepted on 08 Oct 2025, 16:15.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (5)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Fairmount Funds Management LLC | 20% | 10,353,875 | 0 | 10,353,875 | /s/ Peter Harwin | Peter Harwin, Managing Member | 0001802528 |
| Fairmount Healthcare Fund II L.P. | 15% | 7,698,058 | 0 | 7,698,058 | /s/ Peter Harwin | Peter Harwin, Managing Member | 0001769651 |
| Fairmount Healthcare Co-Invest IV L.P. | 5.8% | 2,655,817 | 0 | 2,655,817 | /s/ Peter Harwin | Peter Harwin, Managing Member | 0002042283 |
| Peter Evan Harwin | 20% | 10,353,875 | 0 | 10,353,875 | /s/ Peter Harwin | Peter Harwin | 0001663607 |
| Tomas Kiselak | 20% | 10,353,875 | 0 | 10,353,875 | /s/ Tomas Kiselak | Tomas Kiselak | 0001830177 |