RYTM
Rhythm Pharmaceuticals, Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -1.6% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 113 | +6 | 44.38M | $4.90B | +14 | −7 |
| Q1 2026 | 109 | +6 | 41.83M | $3.64B | +11 | −6 |
| Q4 2025 | 102 | 0 | 43.14M | $4.62B | +3 | −2 |
| Q3 2025 | 20 | +1 | 28.88M | $2.92B | +2 | −2 |
| Q2 2025 | 17 | 0 | 22.96M | $1.45B | +1 | −1 |
| Q1 2025 | 14 | +2 | 11.52M | $610.22M | +2 | — |
| Q4 2024 | 12 | 0 | 11.40M | $638.39M | — | — |
| Q3 2024 | 11 | +3 | 9.71M | $508.75M | +3 | — |
| Q2 2024 | 8 | — | 9.56M | $392.54M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 6.27M | — | $396.05M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | PRIMECAP Management ✦ | 4.88M | -15.7% | $308.24M | 0.2% | ▼ Trim | 5 | SEC ↗ |
| 18 | The Vanguard Group ✦ (passive) | 3.59M | — | $226.80M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | The Vanguard Group ✦ (passive) | 3.59M | — | $226.80M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | The Vanguard Group ✦ (passive) | 3.59M | — | $226.80M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | The Vanguard Group ✦ (passive) | 3.59M | — | $226.80M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | The Vanguard Group ✦ (passive) | 3.59M | — | $226.80M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | Fidelity (FMR) ✦ | 1.95M | — | $123.44M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | Fidelity (FMR) ✦ | 1.95M | — | $123.44M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | Fidelity (FMR) ✦ | 1.95M | — | $123.44M | 0.0% | n/c | 1 | SEC ↗ |
| 26 | Fidelity (FMR) ✦ | 1.95M | — | $123.44M | 0.0% | n/c | 1 | SEC ↗ |
| 27 | State Street Global Advisors ✦ (passive) | 1.91M | -3.2% | $120.54M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 28 | T. Rowe Price ✦ | 1.34M | +11.9% | $84.76M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 29 | T. Rowe Price ✦ | 1.34M | +11.9% | $84.76M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 30 | Geode Capital Management ✦ (passive) | 1.31M | +1.9% | $82.87M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 31 | Geode Capital Management ✦ (passive) | 1.31M | +1.9% | $82.87M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 32 | Marshall Wace ✦ | 376.24K | -29.7% | $23.77M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 33 | Marshall Wace ✦ | 376.24K | -29.7% | $23.77M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 34 | Adage Capital Partners ✦ | 341.00K | New | $21.55M | 0.0% | New | 1 | SEC ↗ |
| 35 | Renaissance Technologies ✦ | 314.89K | +2131.4% | $19.90M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 36 | Norges Bank ✦ (passive) | 207.39K | -7.2% | $13.10M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 37 | Millennium Management ✦ | 198.11K | -8.9% | $12.52M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 38 | Point72 Asset Management ✦ | 170.83K | +167.6% | $10.79M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 39 | AQR Capital Management ✦ | 49.04K | +24.6% | $3.10M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 40 | AQR Capital Management ✦ | 49.04K | +24.6% | $3.10M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 41 | AQR Capital Management ✦ | 49.04K | +24.6% | $3.10M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 42 | AQR Capital Management ✦ | 49.04K | +24.6% | $3.10M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 43 | AQR Capital Management ✦ | 49.04K | +24.6% | $3.10M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 44 | D. E. Shaw & Co. ✦ | 24.28K | -71.0% | $1.53M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 45 | D. E. Shaw & Co. ✦ | 24.28K | -71.0% | $1.53M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 46 | Wellington Management ✦ | 22.43K | -4.8% | $1.42M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 47 | Wellington Management ✦ | 22.43K | -4.8% | $1.42M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 48 | Wellington Management ✦ | 22.43K | -4.8% | $1.42M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 49 | Wellington Management ✦ | 22.43K | -4.8% | $1.42M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 50 | Gotham Asset Management ✦ | 4.85K | +2.1% | $306,535 | 0.0% | ▲ Add | 5 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Adage Capital Partners | $21.55M | 0.0% |
Exited
| Citadel Advisors | $3.71M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 284 holders, 72.02M shares, $6.12B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 2.01K sh · $233,031
Officer · 1.56K sh · $182,170
Officer · 3.40K sh · $402,167
Officer · 800 sh · $95,335
Officer · 75.83K sh · $8.90M
Officer · 2.30K sh · $257,138
Officer · 1.00K sh · $112,856
Officer · 3.60K sh · $413,477
Officer · 14.57K sh · $1.68M
Officer · 18.21K sh · $2.12M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology