Who owns Rhythm Pharmaceuticals, Inc.?
Institutional ownership of RYTM from SEC Form 13F filings across 196 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.
196
13F holders
$4.98B
value, 2026 filers
69.6%
of shares outstanding (47.7M sh)
36
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 | BlackRock, Inc. | 6.2M | $683.6M | 0.0% | 9% | -1.3% |
| 2 | PRIMECAP MANAGEMENT CO/CA/ | 3.2M | $351.8M | 0.2% | 4.6% | -7.3% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.1M | $348.3M | 0.0% | 4.6% | +3.2% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 3.0M | $333.8M | 0.0% | 4.4% | -49.4% |
| 5 | JPMORGAN CHASE & CO | 2.7M | $292.2M | 0.0% | 3.9% | +70.7% |
| 6 | PRICE T ROWE ASSOCIATES INC /MD/ | 2.6M | $284,923 | 0.0% | 3.7% | +55.1% |
| 7 | GOLDMAN SACHS GROUP INC | 2.1M | $236.1M | 0.0% | 3.1% | +8.2% |
| 8 | FEDERATED HERMES, INC. | 1.8M | $198.3M | 0.3% | 2.6% | +38.8% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 1.5M | $170.3M | 0.0% | 2.2% | +8.3% |
| 10 | Capital Research Global Investors | 1.5M | $170.1M | 0.0% | 2.2% | +37.4% |
| 11 | CITADEL ADVISORS LLC | 1.3M | $140.3M | 0.0% | 1.8% | -10.9% |
| 12 | MORGAN STANLEY | 1.1M | $123.5M | 0.0% | 1.6% | +58.0% |
| 13 | FMR LLC | 1.0M | $113.9M | 0.0% | 1.5% | -39.3% |
| 14 | Pictet Asset Management Holding SA | 957,785 | $106.3M | 0.1% | 1.4% | +43.6% |
| 15 | Jupiter Topco LLCNEW | 925,490 | $102.8M | 0.0% | 1.3% | new |
| 16 | ALLIANCEBERNSTEIN L.P. | 894,723 | $77.8M | 0.0% | 1.3% | -1.7% |
| 17 | Woodline Partners LP | 758,891 | $84.3M | 0.3% | 1.1% | -50.0% |
| 18 | Clearbridge Investments, LLC | 696,473 | $77.3M | 0.1% | 1% | +14.3% |
| 19 | NORGES BANKNEW | 685,844 | $76.1M | 0.0% | 1% | new |
| 20 | FRANKLIN RESOURCES INC | 577,033 | $64.1M | 0.0% | 0.8% | -7.9% |
| 21 | Sixth Street Partners Management Company, L.P.NEW | 552,738 | $61.4M | 10.6% | 0.8% | new |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 552,738 | $61.4M | 0.0% | 0.8% | +5.0% |
| 23 | Invesco Ltd. | 543,271 | $60.3M | 0.0% | 0.8% | +49.1% |
| 24 | NORTHERN TRUST CORP | 540,332 | $60.0M | 0.0% | 0.8% | +8.4% |
| 25 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 514,850 | $57.2M | 0.0% | 0.8% | -4.9% |
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.