Institutional Ownership
Rhythm Pharmaceuticals Inc
CUSIP 76243J105COMRYTMQ1 2026
13D / 13G Filings
70
Schedule 13D/13G on record
Beneficial Filers
21
Distinct reporting persons
Largest Stake
13.6%
Max % of class reported
Institutional Holders
277
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
70 filings · latest Feb 17, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 17, 2026 | Ra Capital Management, L.P. | 13G/A | 9.9% | 6.67M | SEC |
| 2 | Feb 12, 2026 | Primecap Management Co/Ca/ | 13G/A | 5.2% | 3.48M | SEC |
| 3 | Jan 30, 2026 | The Vanguard Group | 13G/A | 9.3% | 6.21M | SEC |
| 4 | Nov 14, 2025 | Primecap Management Co/Ca/ | 13G/A | 6.4% | 4.26M | SEC |
| 5 | Oct 30, 2025 | The Vanguard Group | 13G/A | 7.5% | 5.00M | SEC |
| 6 | Aug 14, 2025 | Ra Capital Management, L.P. | 13G/A | 8.7% | 5.56M | SEC |
| 7 | Aug 14, 2025 | Primecap Management Co/Ca/ | 13G/A | 7.7% | 4.88M | SEC |
| 8 | May 15, 2025 | Baker Bros. Advisors LP | 13G/A | 8.9% | 5.60M | SEC |
| 9 | May 15, 2025 | Perceptive Advisors LLC | 13G/A | 6.8% | 4.42M | SEC |
| 10 | May 13, 2025 | Primecap Management Co/Ca/ | 13G/A | 9.2% | 5.79M | SEC |
60 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Rhythm Pharmaceuticals Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Ra Capital Management, L.P. | 6.67M | $579.81M |
| 2 | Blackrock, Inc. | 6.24M | $542.45M |
| 3 | Baker Bros. Advisors LP | 5.60M | $487.42M |
| 4 | Primecap Management Co/Ca/ | 3.42M | $297.22M |
| 5 | Perceptive Advisors LLC | 2.37M | $206.45M |
| 6 | State Street Corp | 2.27M | $197.58M |
| 7 | Goldman Sachs Group Inc | 1.97M | $170.93M |
| 8 | Westfield Capital Management Co LP | 1.93M | $167.78M |
| 9 | Fmr LLC | 1.69M | $146.95M |
| 10 | Polar Capital Holdings PLC | 1.62M | $140.51M |