Rhythm Pharmaceuticals, Inc. (RYTM) ownership: insiders 1% · institutions 114% (13F 2026-03-31). Insider activity, 90 days: Routine (13 sales, 0 open-market buys). SEC EDGAR first-party data.
| Holder | Shares | Market Value | % Outstanding | Reported |
|---|---|---|---|---|
| RA Capital Management, L.P. | 6666837.00 | $579.81M | 9.7% | 2026-03-31 |
| Vanguard | 6526872.00 | $567.64M | 9.5% | 2026-03-31 |
| BlackRock | 6237151.00 | $542.45M | 9.1% | 2026-03-31 |
| Baker BROS. Advisors LP | 5604483.00 | $487.42M | 8.1% | 2026-03-31 |
| NEA Management Company, LLC | 2909956.00 | $311.48M | 4.2% | 2026-03-31 |
| Primecap Management Co | 3417509.00 | $297.22M | 5.0% | 2026-03-31 |
| Perceptive Advisors LLC | 2373795.00 | $206.45M | 3.4% | 2026-03-31 |
| State Street | 2271851.00 | $197.58M | 3.3% | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-13 | |
| Sell | null | 2026-08-13 | |
| Sell | null | 2026-08-13 | |
| Sell | null | 2026-08-13 | |
| Sell | null | 2026-08-13 | |
| Sell | null | 2026-08-13 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.