Security record · archived quarter
RYTM
Rhythm Pharmaceuticals, Inc. · Healthcare · Biotechnology
20Tracked holders
+1Δ holders
28.88MShares held
$2.92BReported value
+2New positions
−2Exits
Momentum inputs (comparable managers):
holder breadth +5.3% ·
share flow +5.1% ·
net new positions 0.0%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2025
Ownership over time
| 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 | — | — |
Who holds it · Q3 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 6.30M | +0.6% | $636.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 17 | The Vanguard Group ✦ (passive) | 5.00M | +39.2% | $504.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 18 | The Vanguard Group ✦ (passive) | 5.00M | +39.2% | $504.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 19 | The Vanguard Group ✦ (passive) | 5.00M | +39.2% | $504.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 20 | The Vanguard Group ✦ (passive) | 5.00M | +39.2% | $504.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 21 | The Vanguard Group ✦ (passive) | 5.00M | +39.2% | $504.59M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 22 | PRIMECAP Management ✦ | 4.26M | -12.6% | $430.51M | 0.3% | ▼ Trim | 6 | SEC ↗ |
| 23 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 26 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 27 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 28 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 29 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 30 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 31 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 32 | JPMorgan Chase ✦ | 2.38M | — | $239.97M | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Fidelity (FMR) ✦ | 2.15M | +9.8% | $216.64M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 34 | Fidelity (FMR) ✦ | 2.15M | +9.8% | $216.64M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 35 | Fidelity (FMR) ✦ | 2.15M | +9.8% | $216.64M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 36 | Fidelity (FMR) ✦ | 2.15M | +9.8% | $216.64M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 37 | State Street Global Advisors ✦ (passive) | 2.03M | +6.3% | $204.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 38 | Goldman Sachs Group ✦ | 1.89M | — | $191.24M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | Goldman Sachs Group ✦ | 1.89M | — | $191.24M | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Goldman Sachs Group ✦ | 1.89M | — | $191.24M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | Goldman Sachs Group ✦ | 1.89M | — | $191.24M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | T. Rowe Price ✦ | 1.40M | +4.4% | $141.38M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 43 | T. Rowe Price ✦ | 1.40M | +4.4% | $141.38M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 44 | Geode Capital Management ✦ (passive) | 1.36M | +3.9% | $137.65M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 45 | Geode Capital Management ✦ (passive) | 1.36M | +3.9% | $137.65M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 46 | Renaissance Technologies ✦ | 546.59K | +73.6% | $55.20M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 47 | Adage Capital Partners ✦ | 544.00K | +59.5% | $54.94M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 48 | Morgan Stanley ✦ | 465.19K | — | $46.98M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | Morgan Stanley ✦ | 465.19K | — | $46.98M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Morgan Stanley ✦ | 465.19K | — | $46.98M | 0.0% | n/c | 1 | SEC ↗ |
| 51 | Morgan Stanley ✦ | 465.19K | — | $46.98M | 0.0% | n/c | 1 | SEC ↗ |
| 52 | Morgan Stanley ✦ | 465.19K | — | $46.98M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Morgan Stanley ✦ | 465.19K | — | $46.98M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | Morgan Stanley ✦ | 465.19K | — | $46.98M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | Marshall Wace ✦ | 171.83K | -54.3% | $17.35M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 56 | Marshall Wace ✦ | 171.83K | -54.3% | $17.35M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 57 | Millennium Management ✦ | 133.16K | -32.8% | $13.45M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 58 | Citadel Advisors ✦ | 132.63K | New | $13.39M | 0.0% | New | 1 | SEC ↗ |
| 59 | AQR Capital Management ✦ | 79.78K | +62.7% | $8.06M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 60 | AQR Capital Management ✦ | 79.78K | +62.7% | $8.06M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 61 | AQR Capital Management ✦ | 79.78K | +62.7% | $8.06M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 62 | AQR Capital Management ✦ | 79.78K | +62.7% | $8.06M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 63 | AQR Capital Management ✦ | 79.78K | +62.7% | $8.06M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 64 | Wellington Management ✦ | 24.48K | +9.2% | $2.47M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 65 | Wellington Management ✦ | 24.48K | +9.2% | $2.47M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 66 | Wellington Management ✦ | 24.48K | +9.2% | $2.47M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 67 | Wellington Management ✦ | 24.48K | +9.2% | $2.47M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 68 | Arrowstreet Capital ✦ | 6.31K | New | $636,944 | 0.0% | New | 1 | SEC ↗ |
| 69 | Gotham Asset Management ✦ | 4.86K | +0.1% | $490,306 | 0.0% | ▲ Add | 6 | SEC ↗ |
| 70 | D. E. Shaw & Co. ✦ | 3.58K | -85.2% | $362,049 | 0.0% | ▼ Trim | 5 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Citadel Advisors | $13.39M | 0.0% |
| Arrowstreet Capital | $636,944 | 0.0% |
Exited
| Norges Bank | $13.10M | was 0.0% |
| Point72 Asset Management | $10.79M | 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.
Frequently co-owned
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)
Aug 13
Garfield Alastair
Officer · 2.01K sh · $233,031
Aug 13
Garfield Alastair
Officer · 1.56K sh · $182,170
Aug 13
Garfield Alastair
Officer · 3.40K sh · $402,167
Aug 13
Garfield Alastair
Officer · 800 sh · $95,335
Aug 13
Lee Jennifer Kayden
Officer · 75.83K sh · $8.90M
Aug 12
Mazabraud Yann
Officer · 2.30K sh · $257,138
Aug 12
Mazabraud Yann
Officer · 1.00K sh · $112,856
Aug 12
Mazabraud Yann
Officer · 3.60K sh · $413,477
Aug 12
Mazabraud Yann
Officer · 14.57K sh · $1.68M
Aug 12
Mazabraud Yann
Officer · 18.21K sh · $2.12M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q3 2025 ·
Methodology ·
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