Security record
RYTM
Rhythm Pharmaceuticals, Inc. · Healthcare · Biotechnology
113Tracked holders
+6Δ holders
44.38MShares held
$4.90BReported value
+14New positions
−7Exits
Momentum inputs (comparable managers):
holder breadth +5.6% ·
share flow +6.9% ·
net new positions +6.2%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
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 · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 6.16M | -1.3% | $683.60M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 17 | PRIMECAP Management ✦ | 3.17M | -7.3% | $351.84M | 0.2% | ▼ Trim | 9 | SEC ↗ |
| 18 | Vanguard Capital Management Llc | 3.01M | +1.3% | $333.75M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 19 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 20 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 21 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 22 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 23 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 24 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 25 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 26 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 27 | JPMorgan Chase ✦ | 2.65M | +70.7% | $292.18M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 28 | State Street Global Advisors ✦ (passive) | 2.57M | +13.3% | $285.73M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 29 | T. Rowe Price ✦ | 2.57M | +55.1% | $284.92M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 30 | T. Rowe Price ✦ | 2.57M | +55.1% | $284.92M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 31 | Goldman Sachs Group ✦ | 2.13M | +8.2% | $236.11M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 32 | Goldman Sachs Group ✦ | 2.13M | +8.2% | $236.11M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 33 | Goldman Sachs Group ✦ | 2.13M | +8.2% | $236.11M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 34 | Goldman Sachs Group ✦ | 2.13M | +8.2% | $236.11M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 35 | Goldman Sachs Group ✦ | 2.13M | +8.2% | $236.11M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 36 | Federated Hermes, Inc. | 1.79M | +38.8% | $198.27M | 0.3% | ▲ Add | 3 | SEC ↗ |
| 37 | Federated Hermes, Inc. | 1.79M | +38.8% | $198.27M | 0.3% | ▲ Add | 3 | SEC ↗ |
| 38 | Federated Hermes, Inc. | 1.79M | +38.8% | $198.27M | 0.3% | ▲ Add | 3 | SEC ↗ |
| 39 | Geode Capital Management ✦ (passive) | 1.53M | +8.3% | $170.32M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 40 | Geode Capital Management ✦ (passive) | 1.53M | +8.3% | $170.32M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 41 | Capital Research Global Investors | 1.53M | +37.4% | $170.13M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 42 | Citadel Advisors ✦ | 1.26M | -10.9% | $140.30M | 0.1% | ▼ Trim | 4 | SEC ↗ |
| 43 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 44 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 45 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 46 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 47 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 48 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 49 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 50 | Morgan Stanley ✦ | 1.11M | +58.0% | $123.49M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 51 | Fidelity (FMR) ✦ | 1.03M | -39.3% | $113.90M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 52 | Fidelity (FMR) ✦ | 1.03M | -39.3% | $113.90M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 53 | Fidelity (FMR) ✦ | 1.03M | -39.3% | $113.90M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 54 | Fidelity (FMR) ✦ | 1.03M | -39.3% | $113.90M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 55 | Pictet Asset Management Holding SA | 957.78K | +43.6% | $106.25M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 56 | Alliancebernstein L.P. | 894.72K | -1.7% | $77.81M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 57 | Clearbridge Investments, LLC | 696.47K | +14.3% | $77.33M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 58 | Norges Bank ✦ (passive) | 685.84K | New | $76.15M | 0.0% | New | 1 | SEC ↗ |
| 59 | Franklin Resources Inc | 577.03K | -8.0% | $64.07M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 60 | Franklin Resources Inc | 577.03K | -8.0% | $64.07M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 61 | Franklin Resources Inc | 577.03K | -8.0% | $64.07M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 62 | Franklin Resources Inc | 577.03K | -8.0% | $64.07M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 63 | Charles Schwab Investment… | 552.74K | +5.0% | $61.37M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 64 | Charles Schwab Investment… | 552.74K | +5.0% | $61.37M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 65 | Invesco Ltd. | 543.27K | +49.1% | $60.32M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 66 | Invesco Ltd. | 543.27K | +49.1% | $60.32M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 67 | Invesco Ltd. | 543.27K | +49.1% | $60.32M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 68 | Invesco Ltd. | 543.27K | +49.1% | $60.32M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 69 | Invesco Ltd. | 543.27K | +49.1% | $60.32M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 70 | Invesco Ltd. | 543.27K | +49.1% | $60.32M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 71 | Northern Trust Corp | 540.33K | +8.4% | $59.99M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 72 | Northern Trust Corp | 540.33K | +8.4% | $59.99M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 73 | Northern Trust Corp | 540.33K | +8.4% | $59.99M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 74 | Northern Trust Corp | 540.33K | +8.4% | $59.99M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 75 | Northern Trust Corp | 540.33K | +8.4% | $59.99M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 76 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 77 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 78 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 79 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 80 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 81 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 82 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 83 | UBS AM, a distinct business unit of… | 514.85K | -4.9% | $57.16M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 84 | Wellington Management ✦ | 488.75K | +78.5% | $54.27M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 85 | Wellington Management ✦ | 488.75K | +78.5% | $54.27M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 86 | Wellington Management ✦ | 488.75K | +78.5% | $54.27M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 87 | Wellington Management ✦ | 488.75K | +78.5% | $54.27M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 88 | Wellington Management ✦ | 488.75K | +78.5% | $54.27M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 89 | Wellington Management ✦ | 488.75K | +78.5% | $54.27M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 90 | Wellington Management ✦ | 488.75K | +78.5% | $54.27M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 91 | Loomis Sayles & Co L P | 434.10K | -6.7% | $48.20M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 92 | Loomis Sayles & Co L P | 434.10K | -6.7% | $48.20M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 93 | Squarepoint Ops LLC | 422.92K | +60.8% | $46.96M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 94 | Point72 Asset Management ✦ | 414.21K | -51.1% | $45.99M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 95 | Ameriprise Financial Inc | 401.63K | +4.6% | $44.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 96 | Ameriprise Financial Inc | 401.63K | +4.6% | $44.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 97 | Ameriprise Financial Inc | 401.63K | +4.6% | $44.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 98 | Ameriprise Financial Inc | 401.63K | +4.6% | $44.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 99 | Ameriprise Financial Inc | 401.63K | +4.6% | $44.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 100 | Adage Capital Partners ✦ | 397.00K | -45.3% | $44.08M | 0.1% | ▼ Trim | 5 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $76.15M | 0.0% |
Exited
| Balyasny Asset Management L.P. | $4.61M | was 0.0% |
| Alyeska Investment Group, L.P. | $2.83M | was 0.0% |
| Hsbc Holdings Plc | $1.22M | was 0.0% |
| HighTower Advisors, LLC | $787,774 | was 0.0% |
| IMC-Chicago, LLC | $582,438 | was 0.0% |
| Bank Of Montreal /Can/ | $330,574 | was 0.0% |
| Toronto Dominion Bank | $522 | 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: Q2 2026 ·
Methodology ·
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