BOSTON, MA
RHYTHM PHARMACEUTICALS, INC.RYTM— Latest position per institution from SEC 13F filings
15
Institutional holders
66.14M
Total shares held
6.55B
Estimated value
3.31M
Avg. position size
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
6.74M
Value
276.82M
Filed
Jun 30, 2024
RA CAPITAL MANAGEMENT, L.P.
CIK 1346824
Shares
6.67M
Value
740.22M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
6.21M
Value
664.82M
Filed
Dec 31, 2025
BLACKROCK, INC.
CIK 2012383
Shares
6.16M
Value
683.60M
Filed
Jun 30, 2026
BAKER BROS. ADVISORS LP
CIK 1263508
Shares
5.60M
Value
622.27M
Filed
Jun 30, 2026
PRIMECAP MANAGEMENT CO/CA/
CIK 763212
Shares
3.17M
Value
351.84M
Filed
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
3.14M
Value
348.29M
Filed
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
3.01M
Value
333.75M
Filed
Jun 30, 2026
NEA MANAGEMENT COMPANY, LLC
CIK 1512848
Shares
2.91M
Value
311.48M
Filed
Dec 31, 2025
JPMORGAN CHASE & CO
CIK 19617
Shares
2.65M
Value
292.18M
Filed
Jun 30, 2026
PERCEPTIVE ADVISORS LLC
CIK 1224962
Shares
2.59M
Value
287.16M
Filed
Jun 30, 2026
STATE STREET CORP
CIK 93751
Shares
2.57M
Value
285.73M
Filed
Jun 30, 2026
PRICE T ROWE ASSOCIATES INC /MD/
CIK 80255
Shares
2.57M
Value
284.92K
Filed
Jun 30, 2026
WESTFIELD CAPITAL MANAGEMENT CO LP
CIK 1177719
Shares
2.21M
Value
245.22M
Filed
Jun 30, 2026
GOLDMAN SACHS GROUP INC
CIK 886982
Shares
2.13M
Value
236.11M
Filed
Jun 30, 2026
FEDERATED HERMES, INC.
CIK 1056288
Shares
1.79M
Value
198.27M
Filed
Jun 30, 2026
POLAR CAPITAL HOLDINGS PLC
CIK 1837309
Shares
1.66M
Value
184.71M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
1.53M
Value
170.32M
Filed
Jun 30, 2026
CAPITAL RESEARCH GLOBAL INVESTORS
CIK 1422848
Shares
1.53M
Value
170.13M
Filed
Jun 30, 2026
CITADEL ADVISORS LLC
CIK 1423053
Shares
1.31M
Value
145.36M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | BLACKROCK FINANCE, INC. | 1364742 | 6.74M | 276.82M | Jun 30, 2024 |
| 2 | RA CAPITAL MANAGEMENT, L.P. | 1346824 | 6.67M | 740.22M | Jun 30, 2026 |
| 3 | VANGUARD GROUP INC | 102909 | 6.21M | 664.82M | Dec 31, 2025 |
| 4 | BLACKROCK, INC. | 2012383 | 6.16M | 683.60M | Jun 30, 2026 |
| 5 | BAKER BROS. ADVISORS LP | 1263508 | 5.60M | 622.27M | Jun 30, 2026 |
| 6 | PRIMECAP MANAGEMENT CO/CA/ | 763212 | 3.17M | 351.84M | Jun 30, 2026 |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 3.14M | 348.29M | Jun 30, 2026 |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 3.01M | 333.75M | Jun 30, 2026 |
| 9 | NEA MANAGEMENT COMPANY, LLC | 1512848 | 2.91M | 311.48M | Dec 31, 2025 |
| 10 | JPMORGAN CHASE & CO | 19617 | 2.65M | 292.18M | Jun 30, 2026 |
| 11 | PERCEPTIVE ADVISORS LLC | 1224962 | 2.59M | 287.16M | Jun 30, 2026 |
| 12 | STATE STREET CORP | 93751 | 2.57M | 285.73M | Jun 30, 2026 |
| 13 | PRICE T ROWE ASSOCIATES INC /MD/ | 80255 | 2.57M | 284.92K | Jun 30, 2026 |
| 14 | WESTFIELD CAPITAL MANAGEMENT CO LP | 1177719 | 2.21M | 245.22M | Jun 30, 2026 |
| 15 | GOLDMAN SACHS GROUP INC | 886982 | 2.13M | 236.11M | Jun 30, 2026 |
| 16 | FEDERATED HERMES, INC. | 1056288 | 1.79M | 198.27M | Jun 30, 2026 |
| 17 | POLAR CAPITAL HOLDINGS PLC | 1837309 | 1.66M | 184.71M | Jun 30, 2026 |
| 18 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 1.53M | 170.32M | Jun 30, 2026 |
| 19 | CAPITAL RESEARCH GLOBAL INVESTORS | 1422848 | 1.53M | 170.13M | Jun 30, 2026 |
| 20 | CITADEL ADVISORS LLC | 1423053 | 1.31M | 145.36M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.