Quick Takeaways
- RA CAPITAL MANAGEMENT, L.P. filed SCHEDULE 13G/A for RHYTHM PHARMACEUTICALS, INC. Common Stock, $0.001 par value per share (RYTM).
- Disclosed ownership: 9.9%.
- Date of event: 31 Dec 2025.
RA CAPITAL MANAGEMENT, L.P. - 31 Dec 2025 SCHEDULE 13G/A Report for RHYTHM PHARMACEUTICALS, INC. Common Stock, $0.001 par value per share (RYTM)
- Filing Manager
- RA CAPITAL MANAGEMENT, L.P.
- Reporting Manager
- RA Capital Management, L.P.
- Symbol
- RYTM
- Shares outstanding
- 67,341,788 shares
- Disclosed Ownership
- 6,666,837 shares
- Ownership
- 9.9%
- Form type
- SCHEDULE 13G/A
- Filing time
- 17 Feb 2026, 16:41:42 UTC
- Date of event
- 31 Dec 2025
- Previous filing
- 14 Aug 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"RA CAPITAL MANAGEMENT, L.P. disclosed 9.9% ownership in RHYTHM PHARMACEUTICALS, INC. Common Stock, $0.001 par value per share (RYTM) on 31 Dec 2025."
What Changed
- Previous schedule filing date: 14 Aug 2025.
- Current filing was accepted on 17 Feb 2026, 16:41.
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.
Official SEC Source
Backed by Schedule 13D/13G
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
See Original FilingReporting Managers (4)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| RA Capital Management, L.P. | 9.9% | 6,666,837 | 0 | 6,666,837 | /s/ Peter Kolchinsky | By Peter Kolchinsky, Authorized Signatory | |
| Peter Kolchinsky | 9.9% | 6,666,837 | 0 | 6,666,837 | /s/ Peter Kolchinsky | Peter Kolchinsky | |
| Rajeev Shah | 9.9% | 6,666,837 | 0 | 6,666,837 | /s/ Rajeev Shah | Rajeev Shah | |
| RA Capital Healthcare Fund, L.P. | 9.9% | 6,666,837 | 0 | 6,666,837 | /s/ Peter Kolchinsky | By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager |