RYTM Rhythm Pharmaceuticals, Inc.
Rhythm Pharmaceuticals, Inc. (RYTM) Institutional Ownership
What the institutions did with RYTM last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | 6.7M | 8.6% |
| BlackRock, Inc. | 6.2M | 8.0% |
| BAKER BROS. ADVISORS LP | 5.6M | 7.2% |
| PRIMECAP MANAGEMENT CO/CA/ | 3.2M | 4.1% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.1M | 4.1% |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.0M | 3.9% |
| JPMORGAN CHASE & CO | 2.7M | 3.4% |
| PERCEPTIVE ADVISORS LLC | 2.6M | 3.3% |
| STATE STREET CORP | 2.6M | 3.3% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 2.6M | 3.3% |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 2.2M | 2.9% |
| GOLDMAN SACHS GROUP INC | 2.1M | 2.7% |
| FEDERATED HERMES, INC. | 1.8M | 2.3% |
| Polar Capital Holdings Plc | 1.7M | 2.1% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.5M | 2.0% |
| Capital Research Global Investors | 1.5M | 2.0% |
| CITADEL ADVISORS LLC | 1.3M | 1.6% |
| Checkpoint Capital L.P. | 1.2M | 1.5% |
| Siren, L.L.C. | 1.1M | 1.5% |
| MORGAN STANLEY | 1.1M | 1.4% |
| FMR LLC | 1.0M | 1.3% |
| Pictet Asset Management Holding SA | 957.8K | 1.2% |
| Jupiter Topco LLC | 925.5K | 1.2% |
| ALLIANCEBERNSTEIN L.P. | 894.7K | 1.2% |
| Woodline Partners LP | 758.9K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| JPMORGAN CHASE & CO | Increased | 1.6M | 2.7M | +1.1M |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 1.7M | 2.6M | +911.3K |
| FMR LLC | Reduced | 1.7M | 1.0M | -663.8K |
| FEDERATED HERMES, INC. | Increased | 1.3M | 1.8M | +499.4K |
| Point72 Asset Management, L.P. | Reduced | 846.8K | 414.2K | -432.6K |
| Capital Research Global Investors | Increased | 1.1M | 1.5M | +416.8K |
| Siren, L.L.C. | Increased | 725.5K | 1.1M | +410.8K |
| MORGAN STANLEY | Increased | 704.0K | 1.1M | +408.3K |
| Assenagon Asset Management S.A. | New | 0 | 373.0K | +373.0K |
| LORD, ABBETT & CO. LLC | Sold Out | 349.0K | 0 | -349.0K |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Reduced | 725.7K | 397.0K | -328.7K |
| Logos Global Management LP | Reduced | 450.0K | 125.0K | -325.0K |
| Driehaus Capital Management LLC | Reduced | 436.5K | 129.3K | -307.3K |
| BANK OF AMERICA CORP /DE/ | Reduced | 628.7K | 325.5K | -303.2K |
| STATE STREET CORP | Increased | 2.3M | 2.6M | +301.7K |
| Pictet Asset Management Holding SA | Increased | 667.0K | 957.8K | +290.7K |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Increased | 1.9M | 2.2M | +279.5K |
| PRIMECAP MANAGEMENT CO/CA/ | Reduced | 3.4M | 3.2M | -248.7K |
| Hood River Capital Management LLC | Sold Out | 239.9K | 0 | -239.9K |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 273.8K | 488.7K | +215.0K |
| PERCEPTIVE ADVISORS LLC | Increased | 2.4M | 2.6M | +212.5K |
| Duquesne Family Office LLC | New | 0 | 203.6K | +203.6K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 258.0K | 68.3K | -189.7K |
| Invesco Ltd. | Increased | 364.3K | 543.3K | +179.0K |
| GOLDMAN SACHS GROUP INC | Increased | 2.0M | 2.1M | +161.1K |
| Squarepoint Ops LLC | Increased | 263.0K | 422.9K | +160.0K |
| CITADEL ADVISORS LLC | Reduced | 1.4M | 1.3M | -155.0K |
| First Turn Management, LLC | New | 0 | 154.0K | +154.0K |
| Qube Research & Technologies Ltd | Reduced | 277.9K | 134.4K | -143.5K |
| Nicholas Investment Partners, LP | New | 0 | 139.3K | +139.3K |
| M&G PLC | Sold Out | 138.6K | 0 | -138.6K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 451.8K | 316.7K | -135.1K |
| KENNEDY CAPITAL MANAGEMENT LLC | Increased | 65.8K | 193.2K | +127.4K |
| SEGALL BRYANT & HAMILL, LLC | New | 0 | 121.9K | +121.9K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.4M | 1.5M | +117.4K |
| Longaeva Partners L.P. | New | 0 | 110.1K | +110.1K |
| Capital World Investors | Increased | 115.7K | 221.5K | +105.8K |
| Bank of New York Mellon Corp | Increased | 293.3K | 394.0K | +100.7K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 3.0M | 3.1M | +96.2K |
| UBS Group AG | Reduced | 231.7K | 144.4K | -87.3K |
| Clearbridge Investments, LLC | Increased | 609.4K | 696.5K | +87.0K |
| Nuveen, LLC | Increased | 117.4K | 203.1K | +85.7K |
| SPHERA FUNDS MANAGEMENT LTD. | New | 0 | 80.4K | +80.4K |
| BlackRock, Inc. | Reduced | 6.2M | 6.2M | -80.2K |
| ADAR1 Capital Management, LLC | Reduced | 211.5K | 136.2K | -75.3K |
| BRAIDWELL LP | Increased | 310.6K | 381.1K | +70.5K |
| CAPITAL FUND MANAGEMENT S.A. | New | 0 | 68.5K | +68.5K |
| XTX Topco Ltd | Reduced | 59.5K | 2.0K | -57.5K |
| Trexquant Investment LP | New | 0 | 56.2K | +56.2K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | Reduced | 62.9K | 9.4K | -53.5K |
| FIRST TRUST ADVISORS LP | Reduced | 85.5K | 32.5K | -53.0K |
| Balyasny Asset Management L.P. | Sold Out | 53.0K | 0 | -53.0K |
| CASTLEARK MANAGEMENT LLC | Sold Out | 52.3K | 0 | -52.3K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 247.9K | 197.4K | -50.5K |
| Integral Health Asset Management, LLC | Reduced | 600.0K | 550.0K | -50.0K |
| FRANKLIN RESOURCES INC | Reduced | 626.8K | 577.0K | -49.8K |
| Harvest Investment Services, LLC | Sold Out | 48.5K | 0 | -48.5K |
| Polar Capital Holdings Plc | Increased | 1.6M | 1.7M | +48.0K |
| CANADA PENSION PLAN INVESTMENT BOARD | New | 0 | 47.4K | +47.4K |
| Man Group plc | Increased | 4.0K | 50.8K | +46.8K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.