Quick Takeaways
- PRIMECAP MANAGEMENT CO/CA/ filed SCHEDULE 13G/A for Rhythm Pharmaceuticals, Inc. COM (RYTM).
- Disclosed ownership: 6.4%.
- Date of event: 30 Sep 2025.
PRIMECAP MANAGEMENT CO/CA/ - 30 Sep 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
- 66,399,673 shares
- Disclosed Ownership
- 4,262,859 shares
- Ownership
- 6.4%
- Form type
- SCHEDULE 13G/A
- Filing time
- 14 Nov 2025, 12:14:56 UTC
- Date of event
- 30 Sep 2025
- Previous filing
- 14 Aug 2025
- Next filing
- 12 Feb 2026
- SEC
- View on sec.gov
Quoteable Key Fact
"PRIMECAP MANAGEMENT CO/CA/ disclosed 6.4% ownership in Rhythm Pharmaceuticals, Inc. COM (RYTM) on 30 Sep 2025."
What Changed
- Previous schedule filing date: 14 Aug 2025.
- Current filing was accepted on 14 Nov 2025, 12:14.
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/ | 6.4% | 4,262,859 | 4,262,859 | 0 | Jorge A. Rodriguez | Deputy Chief Compliance Officer |