Security record · archived quarter
IRON
Disc Medicine, Inc. · Healthcare · Biotechnology
79Tracked holders
+1Δ holders
22.38MShares held
$1.43BReported value
+7New positions
−6Exits
Momentum inputs (comparable managers):
holder breadth +1.3% ·
share flow +2.8% ·
net new positions +1.3%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 83 | +7 | 22.99M | $1.68B | +9 | −2 |
| Q1 2026 | 79 | +1 | 22.38M | $1.43B | +7 | −6 |
| Q4 2025 | 77 | -1 | 22.10M | $1.75B | +1 | −2 |
| Q3 2025 | 17 | +3 | 15.61M | $1.03B | +3 | — |
| Q2 2025 | 11 | -1 | 11.75M | $622.02M | +1 | −2 |
| Q1 2025 | 9 | -1 | 6.07M | $301.51M | — | −1 |
| Q4 2024 | 10 | +3 | 5.16M | $327.26M | +3 | — |
| Q3 2024 | 6 | -1 | 5.16M | $253.75M | — | −1 |
| Q2 2024 | 7 | — | 5.00M | $225.18M | — | — |
Who holds it · Q1 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 5.59M | +2.5% | $357.23M | 0.0% | ▲ Add | 4 | SEC ↗ ×5 |
| 2 | BlackRock ✦ (passive) | 2.27M | -0.1% | $145.39M | 0.0% | ▼ Trim | 4 | SEC ↗ ×12 |
| 3 | Wellington Management ✦ | 1.74M | +14.3% | $110.96M | 0.0% | ▲ Add | 8 | SEC ↗ ×8 |
| 4 | State Street Global Advisors ✦ (passive) | 1.70M | +43.0% | $108.59M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 5 | T. Rowe Price ✦ | 1.55M | -8.8% | $99.07M | 0.0% | ▼ Trim | 8 | SEC ↗ ×2 |
| 6 | Vanguard Capital Management Llc | 1.38M | — | $87.94M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | JPMorgan Chase ✦ | 1.37M | -13.3% | $83.36M | 0.0% | ▼ Trim | 3 | SEC ↗ ×5 |
| 8 | Geode Capital Management ✦ (passive) | 744.22K | +8.7% | $47.60M | 0.0% | ▲ Add | 8 | SEC ↗ ×2 |
| 9 | Goldman Sachs Group ✦ | 639.84K | -15.2% | $40.91M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 10 | Jennison Associates Llc | 610.38K | +14.7% | $39.03M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 11 | Assenagon Asset Management S.A. | 546.25K | +52.6% | $34.93M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 12 | Dimensional Fund Advisors Lp | 394.45K | +76.4% | $25.21M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 13 | Pictet Asset Management Holding SA | 387.00K | -1.9% | $24.75M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 14 | Aberdeen Group plc | 375.61K | +60.3% | $24.02M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 15 | Loomis Sayles & Co L P | 317.22K | +12.3% | $20.28M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 16 | Charles Schwab Investment… | 251.19K | +1.7% | $16.06M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 17 | Northern Trust Corp | 247.19K | +8.4% | $15.81M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 18 | Bank of New York Mellon Corp | 204.97K | +202.7% | $13.11M | 0.0% | ▲ Add | 2 | SEC ↗ ×10 |
| 19 | Ensign Peak Advisors, Inc | 191.49K | +8.2% | $12.24M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 20 | Bank Of America Corp /De/ | 166.78K | +22.6% | $10.66M | 0.0% | ▲ Add | 2 | SEC ↗ ×4 |
| 21 | Bnp Paribas Financial Markets | 127.74K | +4.6% | $8.17M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 22 | Alyeska Investment Group, L.P. | 125.00K | +150.0% | $7.99M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 23 | UBS AM, a distinct business unit of… | 110.89K | -3.0% | $7.09M | 0.0% | ▼ Trim | 2 | SEC ↗ ×6 |
| 24 | UBS Group AG | 98.62K | -15.1% | $6.31M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 25 | Citadel Advisors ✦ | 97.93K | -2.5% | $6.26M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 26 | Morgan Stanley ✦ | 94.26K | +26.0% | $6.03M | 0.0% | ▲ Add | 3 | SEC ↗ ×7 |
| 27 | Millennium Management ✦ | 83.26K | -54.9% | $5.32M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 28 | Nuveen, LLC | 51.38K | +6.0% | $3.29M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 29 | Schroder Investment Management Group | 50.96K | — | $3.10M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 30 | Swiss National Bank | 48.00K | 0.0% | $3.07M | 0.0% | Held | 2 | SEC ↗ |
| 31 | Ameriprise Financial Inc | 45.84K | -44.8% | $2.93M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 32 | Raymond James Financial Inc | 44.70K | -44.3% | $2.73M | 0.0% | ▼ Trim | 2 | SEC ↗ ×4 |
| 33 | BNP Paribas Asset Management… | 39.91K | -0.7% | $2.55M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 34 | Lazard Asset Management Llc | 39.40K | -32.1% | $2.52M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 35 | Universal- Beteiligungs- und… | 38.01K | +39.2% | $2.43M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 36 | California State Teachers… | 34.38K | +47.8% | $2.20M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 37 | Barclays Plc | 33.27K | -66.6% | $2.13M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 38 | Rhumbline Advisers | 33.06K | +10.8% | $2.11M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 39 | Manufacturers Life Insurance… | 32.49K | -38.1% | $2.08M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 40 | Renaissance Technologies ✦ | 31.82K | -49.4% | $2.03M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 41 | Squarepoint Ops LLC | 31.71K | +101.3% | $2.03M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 42 | Tudor Investment Corp Et Al | 31.00K | -53.1% | $1.98M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 43 | Invesco Ltd. | 30.64K | -49.8% | $1.96M | 0.0% | ▼ Trim | 2 | SEC ↗ ×5 |
| 44 | Alliancebernstein L.P. | 24.54K | 0.0% | $1.95M | 0.0% | Held | 2 | SEC ↗ |
| 45 | Td Asset Management Inc | 30.48K | -56.2% | $1.95M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 46 | Victory Capital Management Inc | 29.22K | -61.7% | $1.87M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 47 | Bank Of Montreal /Can/ | 28.77K | +15.9% | $1.84M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 48 | Pnc Financial Services Group, Inc. | 25.29K | +0.4% | $1.62M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 49 | Deutsche Bank Ag\ | 24.40K | +18.9% | $1.56M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 50 | Legal & General Group Plc | 19.38K | -18.1% | $1.24M | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 51 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 16.70K | +21.8% | $1.06M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 52 | Sei Investments Co | 15.51K | New | $991,711 | 0.0% | New | 1 | SEC ↗ ×2 |
| 53 | Susquehanna International Group, Llp | 15.41K | +65.5% | $985,060 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 54 | Wells Fargo & Company/Mn | 14.69K | -55.8% | $939,246 | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 55 | State Of Wisconsin Investment Board | 14.29K | -16.5% | $913,575 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 56 | AQR Capital Management ✦ | 14.15K | +1.1% | $905,071 | 0.0% | ▲ Add | 4 | SEC ↗ ×5 |
| 57 | Janus Henderson Group Plc | 11.55K | 0.0% | $739,462 | 0.0% | Held | 2 | SEC ↗ |
| 58 | Man Group plc | 10.01K | New | $639,784 | 0.0% | New | 1 | SEC ↗ |
| 59 | State Board Of Administration Of… | 8.70K | 0.0% | $556,534 | 0.0% | Held | 2 | SEC ↗ |
| 60 | New York State Common Retirement… | 8.58K | -38.7% | $548,349 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 61 | Citigroup Inc | 7.74K | -78.6% | $495,024 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 62 | Capstone Investment Advisors, Llc | 6.26K | New | $400,584 | 0.0% | New | 1 | SEC ↗ |
| 63 | ProShare Advisors LLC | 5.69K | -8.7% | $363,691 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 64 | Zurcher Kantonalbank (Zurich… | 5.64K | +88.8% | $360,622 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 65 | Voya Investment Management Llc | 4.42K | -66.5% | $282,615 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 66 | Prudential Financial Inc | 4.26K | New | $272,704 | 0.0% | New | 1 | SEC ↗ |
| 67 | Creative Planning | 3.77K | -2.5% | $240,990 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 68 | Russell Investments Group, Ltd. | 2.63K | -88.9% | $168,417 | 0.0% | ▼ Trim | 2 | SEC ↗ ×3 |
| 69 | Mirae Asset Global Investments Co.… | 1.99K | +8.5% | $127,241 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 70 | Jones Financial Companies Lllp | 1.63K | New | $97,766 | 0.0% | New | 1 | SEC ↗ |
| 71 | Us Bancorp \De\ | 1.19K | +0.8% | $75,769 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 72 | Cwm, Llc | 1.03K | +0.2% | $66,178 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 73 | Osaic Holdings, Inc. | 275 | +0.7% | $17,584 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 74 | Optiver Holding B.V. | 82 | +17.1% | $5,243 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 75 | Royal Bank Of Canada | 24 | -97.0% | $2,000 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 76 | Fifth Third Bancorp | 29 | New | $1,859 | 0.0% | New | 1 | SEC ↗ |
| 77 | Assetmark, Inc | 12 | 0.0% | $767 | 0.0% | Held | 2 | SEC ↗ |
| 78 | Group One Trading Llc | 11 | New | $703 | 0.0% | New | 1 | SEC ↗ |
| 79 | Nomura Asset Management Co Ltd | 0 | — | $0 | 0.0% | Held | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Sei Investments Co | $991,711 | 0.0% |
| Man Group plc | $639,784 | 0.0% |
| Capstone Investment Advisors… | $400,584 | 0.0% |
| Prudential Financial Inc | $272,704 | 0.0% |
| Jones Financial Companies Lllp | $97,766 | 0.0% |
| Fifth Third Bancorp | $1,859 | 0.0% |
| Group One Trading Llc | $703 | 0.0% |
Exited
| Balyasny Asset Management L.P. | $17.61M | was 0.0% |
| American Century Companies Inc | $2.41M | was 0.0% |
| Arrowstreet Capital | $616,777 | was 0.0% |
| Marshall Wace | $368,621 | was 0.0% |
| Allianz Asset Management GmbH | $238,230 | was 0.0% |
| Daiwa Securities Group Inc. | $9,000 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 203 holders, 40.63M shares, $2.48B 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)
Sep 11
Bitterman Kevin
Director · 27.14K sh · $1.90M
Sep 04
Bitterman Kevin
Director · 759 sh · $60,690
Sep 04
Bitterman Kevin
Director · 18 sh · $1,439
Sep 04
Bitterman Kevin
Director · 912 sh · $72,924
Sep 03
Bitterman Kevin
Director · 2.34K sh · $187,073
Sep 03
Bitterman Kevin
Director · 54 sh · $4,319
Sep 03
Bitterman Kevin
Director · 2.81K sh · $224,744
Sep 02
Bitterman Kevin
Director · 511 sh · $40,967
Sep 02
Bitterman Kevin
Director · 26.54K sh · $2.13M
Sep 02
Bitterman Kevin
Director · 22.09K sh · $1.77M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Aug 06
SC 13G/A — FMR LLC
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: Q1 2026 ·
Methodology ·
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