Quick Takeaways
- PRIMECAP MANAGEMENT CO/CA/ filed SCHEDULE 13G/A for RHYTHM PHARMACEUTICALS, INC. COM (RYTM).
- Disclosed ownership: 5.2%.
- Date of event: 31 Dec 2025.
PRIMECAP MANAGEMENT CO/CA/ - 31 Dec 2025 SCHEDULE 13G/A Report for RHYTHM PHARMACEUTICALS, INC. COM (RYTM)
- Filing Manager
- PRIMECAP MANAGEMENT CO/CA/
- Reporting Manager
- PRIMECAP MANAGEMENT CO/CA/
- Security
- RHYTHM PHARMACEUTICALS, INC. COM
- Symbol
- RYTM
- Shares outstanding
- 66,769,079 shares
- Disclosed Ownership
- 3,478,669 shares
- Ownership
- 5.2%
- Form type
- SCHEDULE 13G/A
- Filing time
- 12 Feb 2026, 10:08:44 UTC
- Date of event
- 31 Dec 2025
- Previous filing
- 14 Nov 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"PRIMECAP MANAGEMENT CO/CA/ disclosed 5.2% ownership in RHYTHM PHARMACEUTICALS, INC. COM (RYTM) on 31 Dec 2025."
What Changed
- Previous schedule filing date: 14 Nov 2025.
- Current filing was accepted on 12 Feb 2026, 10:08.
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 (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| PRIMECAP MANAGEMENT CO/CA/ | 5.2% | 3,478,669 | 3,478,669 | 0 | Jorge A. Rodriguez | Deputy Chief Compliance Officer |