Companies / Rhythm Pharmaceuticals, Inc. / Activity
Activity — Rhythm Pharmaceuticals, Inc.
94 moves.
Top impactInsider · CEO movesInsider · biggest buysInsider · biggest sellsInstitution · biggest movesInstitution · new positions
| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Q1 2026 as of | Westfield Capital Management Company, L.P. 13F manager | Add | Common stock | $57.57M | +662K +52.24% | 1,929,123 2.80% of shares | high |
| Q2 2026 as of | State Street Corporation 13F manager | Add | Common stock | $41.63M | +375K +17.05% | 2,573,529 3.74% of shares | medium |
| Q1 2026 as of | Federated Hermes Inc 13F manager | Trim | Common stock | $-29.36M | -338K -20.79% | 1,286,303 1.87% of shares | medium |
| Q1 2026 as of | Millennium Management LLC 13F manager | Add | Common stock | $23.06M | +265K +141.99% | 451,825 0.66% of shares | medium |
| Q3 2025 as of | Barclays PLC 13F manager | Trim | Common stock | $-21.09M | -209K -59.46% | 142,385 0.21% of shares | medium |
| Q1 2026 as of | Janus Henderson Group PLC 13F manager | Trim | Common stock | $-18.10M | -208K -18.47% | 918,153 1.33% of shares | medium |
| Q4 2025 as of | Norges Bank 13F manager | Trim | Common stock | $-16.83M | -157K -70.37% | 66,213 0.10% of shares | medium |
| Q2 2025 as of | Barclays PLC 13F manager | Add | Common stock | $15.80M | +250K +246.98% | 351,198 0.51% of shares | medium |
| Q2 2026 as of | BlackRock, Inc. 13F manager | Trim | Common stock | $-15.59M | -140K -2.23% | 6,156,902 8.94% of shares | medium |
| Q1 2026 as of | Perceptive Advisors LLC 13F manager | Trim | Common stock | $-15.01M | -173K -6.78% | 2,373,795 3.45% of shares | medium |
| Q1 2026 as of | Schroder Investment Management Group 13F manager | New | Common stock | $10.17M | +132K | 131,674 0.19% of shares | medium |
| Q1 2026 as of | Adage Capital Partners Gp, L.L.C. 13F manager | Add | Common stock | $9.06M | +104K +16.76% | 725,744 1.05% of shares | medium |
| Q1 2026 as of | Clearbridge Investments, LLC 13F manager | Add | Common stock | $8.99M | +103K +20.42% | 609,437 0.89% of shares | medium |
| Q1 2026 as of | BNP Paribas Financial Markets 13F manager | Add | Common stock | $7.25M | +83K +50.63% | 247,876 0.36% of shares | medium |
| Q1 2026 as of | Renaissance Technologies LLC 13F manager | Trim | Common stock | $-7.23M | -83K -24.38% | 258,011 0.37% of shares | medium |
| Q1 2026 as of | Norges Bank 13F manager | Exit | Common stock | $-7.09M | -66K -100.00% | 0 | medium |
| Q1 2026 as of | Orbimed Advisors LLC 13F manager | Add | Common stock | $6.46M | +74K +30.98% | 314,100 0.46% of shares | medium |
| Q1 2024 as of | Barclays PLC 13F manager | Trim | Common stock | $-5.37M | -124K -49.27% | 127,536 0.19% of shares | medium |
| Q1 2026 as of | Nicholas Investment Partners, LP 13F manager | Exit | Common stock | $-3.72M | -35K -100.00% | 0 | low |
| Q1 2026 as of | Geode Capital Management, LLC 13F manager | Add | Common stock | $3.53M | +41K +2.95% | 1,416,269 2.06% of shares | low |
| Q1 2026 as of | Magnetar Financial LLC 13F manager | Exit | Common stock | $-3.17M | -30K -100.00% | 0 | low |
| Q2 2024 as of | Barclays PLC 13F manager | Trim | Common stock | $-3.03M | -74K -57.95% | 53,631 0.08% of shares | low |
| Q1 2026 as of | WCM Investment Management, LLC 13F manager | Add | Common stock | $2.77M | +36K +79.94% | 80,620 0.12% of shares | low |
| Q3 2024 as of | Barclays PLC 13F manager | Add | Common stock | $2.76M | +53K +98.39% | 106,397 0.15% of shares | low |
| Q3 2023 as of | Barclays PLC 13F manager | Add | Common stock | $2.55M | +111K +85.26% | 241,261 0.35% of shares | low |
| Q1 2026 as of | HighVista Strategies LLC 13F manager | Trim | Common stock | $-2.27M | -26K -60.82% | 16,796 0.02% of shares | low |
| Q1 2026 as of | Victory Capital Management, Inc. 13F manager | Trim | Common stock | $-2.16M | -25K -54.82% | 20,504 0.03% of shares | low |
| Q1 2026 as of | AllianceBernstein L.P. 13F manager | Trim | Common stock | $-2.12M | -20K -2.13% | 910,413 1.32% of shares | low |
| Q1 2026 as of | Granahan Investment Management, LLC 13F manager | Add | Common stock | $2.11M | +24K +45.38% | 77,709 0.11% of shares | low |
| Q1 2026 as of | Prudential Financial Inc 13F manager | Trim | Common stock | $-2.00M | -23K -43.19% | 30,190 0.04% of shares | low |
| Q1 2025 as of | Barclays PLC 13F manager | Trim | Common stock | $-1.81M | -34K -25.24% | 101,217 0.15% of shares | low |
| Q1 2023 as of | Barclays PLC 13F manager | Trim | Common stock | $-1.70M | -95K -52.29% | 87,118 0.13% of shares | low |
| Q1 2026 as of | Balyasny Asset Management L.P. 13F manager | Trim | Common stock | $-1.68M | -19K -26.72% | 52,967 0.08% of shares | low |
| Q4 2024 as of | Barclays PLC 13F manager | Add | Common stock | $1.62M | +29K +27.26% | 135,397 0.20% of shares | low |
| Q2 2026 as of | Deutsche Bank AG 13F manager | Trim | Common stock | $-1.54M | -14K -10.76% | 115,232 0.17% of shares | low |
| Q2 2026 as of | Victory Capital Management, Inc. 13F manager | Trim | Common stock | $-1.42M | -13K -62.55% | 7,679 0.01% of shares | low |
| Q1 2026 as of | TD Asset Management Inc 13F manager | Trim | Common stock | $-1.42M | -16K -29.56% | 38,778 0.06% of shares | low |
| Q1 2026 as of | Voya Investment Management LLC 13F manager | Trim | Common stock | $-1.40M | -16K -6.43% | 233,810 0.34% of shares | low |
| Q1 2026 as of | Los Angeles Capital Management LLC 13F manager | Trim | Common stock | $-1.31M | -15K -62.11% | 9,219 0.01% of shares | low |
| Q4 2025 as of | Barclays PLC 13F manager | Trim | Common stock | $-1.17M | -11K -7.69% | 131,436 0.19% of shares | low |
| Q1 2026 as of | Silvercrest Asset Management Group LLC 13F manager | Add | Common stock | $1.11M | +13K +37.39% | 46,887 0.07% of shares | low |
| Q1 2026 as of | California State Teachers Retirement System 13F manager | Add | Common stock | $1.07M | +12K +22.92% | 65,806 0.10% of shares | low |
| Q1 2026 as of | Castleark Management LLC 13F manager | Trim | Common stock | $-1.06M | -12K -18.92% | 52,279 0.08% of shares | low |
| Q1 2026 as of | AQR Capital Management, LLC 13F manager | Trim | Common stock | $-936.4K | -11K -15.37% | 59,279 0.09% of shares | low |
| Q4 2025 as of | Bank of America Corp /De 13F manager | Trim | Common stock | $-927.6K | -9K -3.72% | 224,484 0.33% of shares | low |
| Q1 2026 as of | Marshall Wace, LLP 13F manager | New | Common stock | $837.3K | +10K | 9,628 0.01% of shares | low |
| Q1 2026 as of | Hudson Bay Capital Management LP 13F manager | New | Common stock | $793.2K | +9K | 9,120 0.01% of shares | low |
| Q1 2026 as of | Prelude Capital Management, LLC 13F manager | New | Common stock | $728.1K | +8K | 8,372 0.01% of shares | low |
| Q1 2026 as of | Axiom Investors LLC /De 13F manager | Add | Common stock | $712.7K | +8K +9.81% | 91,749 0.13% of shares | low |
| Q2 2023 as of | Barclays PLC 13F manager | Add | Common stock | $710.9K | +43K +49.48% | 130,228 0.19% of shares | low |