Rhythm Pharmaceuticals Inc (RYTM)
Healthcare
Biotechnology
99.30 $
-6.1%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns Rhythm Pharmaceuticals Inc (RYTM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 81.2% of the shares are freely tradable; institutional investors hold 110.0%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
110.0%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
0.8%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
81.2%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
14.1%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
69Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| RA Capital Management, LLC | 9.73 | 6,666,837 | +0.0 | 03/31/2026 |
| BlackRock Inc | 9.10 | 6,237,151 | -1.0 | 03/31/2026 |
| Baker Bros Advisors LP | 8.18 | 5,604,483 | +0.0 | 03/31/2026 |
| PRIMECAP Management Company | 4.99 | 3,417,509 | -1.8 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.44 | 3,040,718 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.33 | 2,967,825 | +0.0 | 03/31/2026 |
| Perceptive Advisors LLC | 3.46 | 2,373,795 | -6.8 | 03/31/2026 |
| State Street Corp | 3.32 | 2,271,851 | +3.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Morn Total Stk Mkt Idx Investor | 3.18 | 2,177,236 | -0.1 | 06/30/2026 |
| PRIMECAP Odyssey Aggressive Growth | 2.90 | 1,988,239 | -6.4 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.