Rhythm Pharmaceuticals, Inc.
RYTM- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001649904
In the last 90 days, Rhythm Pharmaceuticals, Inc. insiders filed 0 open-market purchases and 6 sales; 304 institutions reported holding it in 13F filings for Q2 2026, worth $8.55B in total; Duquesne Family Office is the only superinvestor holding it.
13F holders, Q2 2026
Institutional positions in Rhythm Pharmaceuticals, Inc. as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 304
- +23 vs. Q1 2026
- Shares held
- 77.2M
- +4.58M (+6.3%) vs. Q1 2026
- Total value
- $8.55B
- +$2.21B (+34.8%) vs. Q1 2026
- New holders
- 64
- 105 more added
- Sold out
- 41
- 101 more reduced
4 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting RYTM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 304 | $8.55B |
| Q1 2026 | 285 | $6.42B |
| Q4 2025 | 281 | $7.80B |
| Q3 2025 | 264 | $7.20B |
| Q2 2025 | 227 | $4.20B |
| Q1 2025 | 228 | $3.44B |
| Q4 2024 | 203 | $3.63B |
| Q3 2024 | 176 | $3.55B |
| Q2 2024 | 165 | $2.85B |
| Q1 2024 | 167 | $2.95B |
| Q4 2023 | 169 | $3.07B |
| Q3 2023 | 144 | $1.56B |
| Q2 2023 | 116 | $1.09B |
| Q1 2023 | 126 | $1.08B |
| Q4 2022 | 115 | $1.81B |
| Q3 2022 | 101 | $1.45B |
| Q2 2022 | 90 | $190.8M |
| Q1 2022 | 111 | $562.7M |
| Q4 2021 | 98 | $483.6M |
| Q3 2021 | 97 | $626.3M |
| Q2 2021 | 105 | $905.6M |
| Q1 2021 | 124 | $1.01B |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Rhythm Pharmaceuticals, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Primecap Management Co | 3,168,853 | $351.8M | 0.21% | −248,656−7.3% | Reduced |
| Baker Bros. Advisors LP | 5,604,483 | $622.3M | 3.12% | 00.0% | Unchanged |
| BlackRock, Inc. | 6,156,902 | $683.6M | 0.01% | −80,249−1.3% | Reduced |
| Ra Capital Management, L.P. | 6,666,837 | $740.2M | 6.43% | 00.0% | Unchanged |
| Lord, Abbett & Co. LLC | 0 | $0 | 0.00% | −348,953−100.0% | Sold out |
| Hood River Capital Management LLC | 0 | $0 | 0.00% | −239,912−100.0% | Sold out |
| M&G Plc | 0 | $0 | 0.00% | −138,567−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −52,967−100.0% | Sold out |
| Castleark Management LLC | 0 | $0 | 0.00% | −52,279−100.0% | Sold out |
| Harvest Investment Services, LLC | 0 | $0 | 0.00% | −48,468−100.0% | Sold out |
| Utah Retirement Systems | 0 | $0 | 0.00% | −42,177−100.0% | Sold out |
| Alyeska Investment Group, L.P. | 0 | $0 | 0.00% | −32,589−100.0% | Sold out |
| Harbor Capital Advisors, Inc. | 0 | $0 | 0.00% | −30,353−100.0% | Sold out |
| PDT Partners, LLC | 0 | $0 | 0.00% | −27,232−100.0% | Sold out |
| HSBC Holdings PLC | 0 | $0 | 0.00% | −14,307−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −9,120−100.0% | Sold out |
| HighTower Advisors, LLC | 0 | $0 | 0.00% | −9,058−100.0% | Sold out |
| Prelude Capital Management, LLC | 0 | $0 | 0.00% | −8,372−100.0% | Sold out |
| IMC-Chicago, LLC | 0 | $0 | 0.00% | −6,697−100.0% | Sold out |
| Texas Treasury Safekeeping Trust Co | 0 | $0 | 0.00% | −6,154−100.0% | Sold out |
| Campbell & CO Investment Adviser LLC | 0 | $0 | 0.00% | −5,958−100.0% | Sold out |
| Blueshift Asset Management, LLC | 0 | $0 | 0.00% | −5,787−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −4,000−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −4,499−100.0% | Sold out |
| Bank of Montreal | 0 | $0 | 0.00% | −3,801−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −3,777−100.0% | Sold out |
| Chicago Partners Investment Group LLC | 0 | $0 | 0.00% | −3,125−100.0% | Sold out |
| Ethic Inc. | 0 | $0 | 0.00% | −3,003−100.0% | Sold out |
| MAI Capital Management | 0 | $0 | 0.00% | −2,710−100.0% | Sold out |
| Blackstone Group Inc. | 0 | $0 | 0.00% | −2,600−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −2,562−100.0% | Sold out |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −2,545−100.0% | Sold out |
| Cornerstone Partners Capital Management, LLC | 0 | $0 | 0.00% | −2,462−100.0% | Sold out |
| Verdad Advisers, LP | 0 | $0 | 0.00% | −2,445−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −1,363−100.0% | Sold out |
| Sound Income Strategies, LLC | 0 | $0 | 0.00% | −114−100.0% | Sold out |
| Eastern Bank | 0 | $0 | 0.00% | −59−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −37−100.0% | Sold out |
| Golden State Equity Partners | 0 | $0 | 0.00% | −37−100.0% | Sold out |
| Root Financial Partners, LLC | 0 | $0 | 0.00% | −31−100.0% | Sold out |
| JFS Wealth Advisors, LLC | 0 | $0 | 0.00% | −10−100.0% | Sold out |
| Toronto Dominion Bank | 0 | $0 | 0.00% | −6−100.0% | Sold out |
| Twin Peaks Wealth Advisors, LLC | 0 | $0 | 0.00% | −6−100.0% | Sold out |
| HFM Investment Advisors, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Bay Harbor Wealth Management, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Janus Henderson Group PLC | – | – | – | – | Not filed |
| Leo Wealth, LLC | – | – | – | – | Not filed |
| Cim Investment Mangement Inc | – | – | – | – | Not filed |
| CWM, LLC | – | – | – | – | Not filed |