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Of the 19 tracked institutions holding RYTM, 9 have a 3-year clone track record — 9 of them beat the S&P. Average holder's clone alpha: +6.9pt. It's a gauge of who owns the name, not just how many.
Among the 19 tracked institutional investors we monitor, RYTM (RHYTHM PHARMACEUTICALS INC) is held with a combined value of $3.92B across 35,560,740 shares. The largest holder is RA CAPITAL MANAGEMENT, L.P. with a position worth $740.22M (6.43% of their portfolio). 2 funds opened new positions in the most recent quarter. 6 funds increased their holdings. 9 funds reduced their position.
Total Institutional Value
$3.92B
Total Shares Held
35,560,740
Institutional Holders
19
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | $740.22M | 6.43% | - |
| 2 | BlackRock, Inc. | $683.60M | 0.01% | -1.3% |
| 3 | VANGUARD GROUP INC | $664.82M | 0.01% | +24.3% |
| 4 | BAKER BROS. ADVISORS LP | $622.27M | 3.12% | - |
| 5 | STATE STREET CORP | $285.73M | 0.01% | +13.3% |
| 6 | PRICE T ROWE ASSOCIATES INC /MD/ | $284.92M | 0.03% | +55.1% |
| 7 | Capital Research Global Investors | $170.13M | 0.02% | +37.4% |
| 8 | CITADEL ADVISORS LLC | $140.30M | 0.08% | -10.9% |
| 9 | FMR LLC | $113.90M | 0.00% | -39.3% |
| 10 | WELLINGTON MANAGEMENT GROUP LLP | $54.27M | 0.01% | +78.5% |
As of the latest SEC 13F filings, RA CAPITAL MANAGEMENT, L.P. is the largest institutional holder of RYTM with a position worth $740.22M, representing 6.43% of their portfolio. In total, 19 institutional investors hold RYTM with a combined value of $3.92B.
In the most recent quarter, 2 funds opened a new position in RYTM. Additionally, 6 increased their holdings and 9 reduced their positions.
Institutional investors hold $3.92B worth of RYTM stock across 19 positions. The largest institutional holder is RA CAPITAL MANAGEMENT, L.P. with $740.22M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For RYTM, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their RYTM positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Last Close
$92.83
2026-10-02
YTD
-11.6%
41% of 52-week range
