Who owns RHYTHM PHARMACEUTICALS, INC.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of RYTM from SEC Form 13F filings across 306 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 306 institutions disclosed 77.1M shares of RHYTHM PHARMACEUTICALS, INC. worth $8.54B — about 112.4% of shares outstanding; the largest disclosed holder is RA CAPITAL MANAGEMENT, L.P.. Source: SEC Form 13F filings, parsed by EvidInvest.
306
13F holders
$8.54B
value, 2026 filers
112.4%
of shares outstanding (77.1M sh)
66
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of RYTM's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 6.7M | $740.2M | 6.4% | 9.7% | 0.0% |
| 2 | BlackRock, Inc. | 6.2M | $683.6M | 0.0% | 9% | -1.3% |
| 3 | BAKER BROS. ADVISORS LP | 5.6M | $622.3M | 3.1% | 8.2% | 0.0% |
| 4 | PRIMECAP MANAGEMENT CO/CA/ | 3.2M | $351.8M | 0.2% | 4.6% | -7.3% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.1M | $348.3M | 0.0% | 4.6% | +3.2% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 3.0M | $333.8M | 0.0% | 4.4% | +1.3% |
| 7 | JPMORGAN CHASE & CO | 2.7M | $292.2M | 0.0% | 3.9% | +70.7% |
| 8 | PERCEPTIVE ADVISORS LLC | 2.6M | $287.2M | 4.3% | 3.8% | +9.0% |
| 9 | STATE STREET CORP | 2.6M | $285.7M | 0.0% | 3.8% | +13.3% |
| 10 | PRICE T ROWE ASSOCIATES INC /MD/ | 2.6M | $284.9M | 0.0% | 3.7% | +55.1% |
| 11 | WESTFIELD CAPITAL MANAGEMENT CO LP | 2.2M | $245.2M | 0.8% | 3.2% | +14.5% |
| 12 | GOLDMAN SACHS GROUP INC | 2.1M | $236.1M | 0.0% | 3.1% | +8.2% |
| 13 | FEDERATED HERMES, INC. | 1.8M | $198.3M | 0.3% | 2.6% | +38.8% |
| 14 | Polar Capital Holdings Plc | 1.7M | $184.7M | 0.4% | 2.4% | +3.0% |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | 1.5M | $170.3M | 0.0% | 2.2% | +8.3% |
| 16 | Capital Research Global Investors | 1.5M | $170.1M | 0.0% | 2.2% | +37.4% |
| 17 | CITADEL ADVISORS LLC | 1.3M | $140.3M | 0.0% | 1.8% | -10.9% |
| 18 | Checkpoint Capital L.P. | 1.2M | $131.7M | 33.8% | 1.7% | -3.4% |
| 19 | Siren, L.L.C. | 1.1M | $126.2M | 2.6% | 1.7% | +56.6% |
| 20 | MORGAN STANLEY | 1.1M | $123.5M | 0.0% | 1.6% | +58.0% |
| 21 | FMR LLC | 1.0M | $113.9M | 0.0% | 1.5% | -39.3% |
| 22 | Pictet Asset Management Holding SA | 957,785 | $106.3M | 0.1% | 1.4% | +43.6% |
| 23 | Jupiter Topco LLCNEW | 925,490 | $102.8M | 0.0% | 1.3% | new |
| 24 | ALLIANCEBERNSTEIN L.P. | 894,723 | $77.8M | 0.0% | 1.3% | -1.7% |
| 25 | Woodline Partners LP | 758,891 | $84.3M | 0.3% | 1.1% | 0.0% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.