Security record · archived quarter
IRON
Disc Medicine, Inc. · Healthcare · Biotechnology
77Tracked holders
-1Δ holders
22.10MShares held
$1.75BReported value
+1New positions
−2Exits
Momentum inputs (comparable managers):
holder breadth -1.3% ·
share flow +8.6% ·
net new positions -1.3%
· formula
Concentrated accumulation: rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 1 | 0 | 1.12M | $73.28M | n/a | −1 |
| 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 | n/a |
| Q2 2025 | 11 | -1 | 11.75M | $622.02M | +1 | −2 |
| Q1 2025 | 9 | -1 | 6.07M | $301.51M | n/a | −1 |
| Q4 2024 | 10 | +3 | 5.16M | $327.26M | +3 | n/a |
| Q3 2024 | 6 | -1 | 5.16M | $253.75M | n/a | −1 |
| Q2 2024 | 7 | n/a | 5.00M | $225.18M | n/a | n/a |
Who holds it · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 5.45M | +10.4% | $432.80M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 2 | BlackRock ✦ (passive) | 2.27M | +12.7% | $180.66M | 0.0% | ▲ Add | 3 | SEC ↗ ×13 |
| 3 | The Vanguard Group ✦ (passive) | 1.77M | +22.1% | $140.37M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 4 | T. Rowe Price ✦ | 1.70M | +28.0% | $134.84M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 5 | JPMorgan Chase ✦ | 1.58M | +5.0% | $125.56M | 0.0% | ▲ Add | 2 | SEC ↗ ×6 |
| 6 | Wellington Management ✦ | 1.52M | +7.7% | $120.57M | 0.0% | ▲ Add | 7 | SEC ↗ ×8 |
| 7 | State Street Global Advisors ✦ (passive) | 1.19M | +13.6% | $94.34M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 8 | Goldman Sachs Group ✦ | 754.20K | +42.5% | $59.89M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 9 | Geode Capital Management ✦ (passive) | 684.96K | +9.0% | $54.40M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 10 | Jennison Associates Llc | 532.08K | n/a | $42.25M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | Pictet Asset Management Holding SA | 394.37K | n/a | $31.32M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | Assenagon Asset Management S.A. | 357.84K | n/a | $28.42M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | Loomis Sayles & Co L P | 282.41K | n/a | $22.43M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 14 | Charles Schwab Investment… | 247.04K | n/a | $19.62M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | Aberdeen Group plc | 234.36K | n/a | $18.61M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | Northern Trust Corp | 228.07K | n/a | $18.11M | 0.0% | n/c | 1 | SEC ↗ ×6 |
| 17 | Dimensional Fund Advisors Lp | 223.57K | n/a | $17.75M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 18 | Balyasny Asset Management L.P. | 221.76K | n/a | $17.61M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | Millennium Management ✦ | 184.78K | +14.8% | $14.67M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 20 | Ensign Peak Advisors, Inc | 177.05K | n/a | $14.06M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | Bank Of America Corp /De/ | 135.99K | n/a | $10.80M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 22 | Bnp Paribas Financial Markets | 122.15K | n/a | $9.70M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | UBS Group AG | 116.11K | n/a | $9.22M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 24 | UBS AM, a distinct business unit of… | 114.35K | n/a | $9.08M | 0.0% | n/c | 1 | SEC ↗ ×6 |
| 25 | Citadel Advisors ✦ | 100.39K | +99.2% | $7.97M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 26 | Barclays Plc | 99.61K | n/a | $7.91M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 27 | Ameriprise Financial Inc | 82.98K | n/a | $6.59M | 0.0% | n/c | 1 | SEC ↗ |
| 28 | Raymond James Financial Inc | 80.27K | n/a | $6.18M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 29 | Victory Capital Management Inc | 76.34K | n/a | $6.06M | 0.0% | n/c | 1 | SEC ↗ |
| 30 | Morgan Stanley ✦ | 74.83K | +33.4% | $5.94M | 0.0% | ▲ Add | 2 | SEC ↗ ×7 |
| 31 | Td Asset Management Inc | 69.63K | n/a | $5.53M | 0.0% | n/c | 1 | SEC ↗ |
| 32 | Bank of New York Mellon Corp | 67.71K | n/a | $5.38M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 33 | Tudor Investment Corp Et Al | 66.12K | n/a | $5.25M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Renaissance Technologies ✦ | 62.82K | +823.8% | $4.99M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 35 | Invesco Ltd. | 61.07K | n/a | $4.85M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 36 | Lazard Asset Management Llc | 58.05K | n/a | $4.61M | 0.0% | n/c | 1 | SEC ↗ |
| 37 | Manufacturers Life Insurance… | 52.51K | n/a | $4.07M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Alyeska Investment Group, L.P. | 50.00K | n/a | $3.97M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | Nuveen, LLC | 48.47K | n/a | $3.85M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 40 | Swiss National Bank | 48.00K | n/a | $3.81M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | BNP Paribas Asset Management… | 40.20K | n/a | $3.19M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 42 | Citigroup Inc | 36.18K | n/a | $2.87M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 43 | Wells Fargo & Company/Mn | 33.27K | n/a | $2.64M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 44 | American Century Companies Inc | 30.33K | n/a | $2.41M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Rhumbline Advisers | 29.83K | n/a | $2.37M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Universal- Beteiligungs- und… | 27.30K | n/a | $2.17M | 0.0% | n/c | 1 | SEC ↗ |
| 47 | Pnc Financial Services Group, Inc. | 25.20K | n/a | $2.00M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 48 | Bank Of Montreal /Can/ | 24.83K | n/a | $1.97M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 49 | Alliancebernstein L.P. | 24.54K | n/a | $1.95M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Russell Investments Group, Ltd. | 23.68K | n/a | $1.88M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 51 | Legal & General Group Plc | 23.65K | n/a | $1.88M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 52 | California State Teachers… | 23.26K | n/a | $1.85M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Deutsche Bank Ag\ | 20.52K | n/a | $1.63M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 54 | State Of Wisconsin Investment Board | 17.11K | n/a | $1.36M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | Squarepoint Ops LLC | 15.75K | n/a | $1.25M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | AQR Capital Management ✦ | 14.01K | +0.2% | $1.11M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 57 | New York State Common Retirement… | 13.98K | n/a | $1.11M | 0.0% | n/c | 1 | SEC ↗ |
| 58 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 13.71K | n/a | $1.08M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 59 | Voya Investment Management Llc | 13.19K | n/a | $1.05M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 60 | Janus Henderson Group Plc | 11.55K | n/a | $917,987 | 0.0% | n/c | 1 | SEC ↗ |
| 61 | Susquehanna International Group, Llp | 9.31K | n/a | $739,228 | 0.0% | n/c | 1 | SEC ↗ |
| 62 | State Board Of Administration Of… | 8.70K | n/a | $691,185 | 0.0% | n/c | 1 | SEC ↗ |
| 63 | Arrowstreet Capital ✦ | 7.77K | New | $616,777 | 0.0% | New | 1 | SEC ↗ |
| 64 | ProShare Advisors LLC | 6.23K | n/a | $494,485 | 0.0% | n/c | 1 | SEC ↗ |
| 65 | Marshall Wace ✦ | 4.64K | -66.8% | $368,621 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 66 | Creative Planning | 3.86K | n/a | $306,840 | 0.0% | n/c | 1 | SEC ↗ |
| 67 | Allianz Asset Management GmbH | 3.00K | n/a | $238,230 | 0.0% | n/c | 1 | SEC ↗ |
| 68 | Zurcher Kantonalbank (Zurich… | 2.99K | n/a | $237,277 | 0.0% | n/c | 1 | SEC ↗ |
| 69 | Mirae Asset Global Investments Co.… | 1.83K | n/a | $145,638 | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Us Bancorp \De\ | 1.18K | n/a | $93,386 | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Cwm, Llc | 1.03K | n/a | $82,000 | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Royal Bank Of Canada | 802 | n/a | $64,000 | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 73 | Osaic Holdings, Inc. | 273 | n/a | $21,679 | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Daiwa Securities Group Inc. | 113 | n/a | $9,000 | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Optiver Holding B.V. | 70 | n/a | $5,559 | 0.0% | n/c | 1 | SEC ↗ |
| 76 | Assetmark, Inc | 12 | n/a | $953 | 0.0% | n/c | 1 | SEC ↗ |
| 77 | Nomura Asset Management Co Ltd | 0 | n/a | $0 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Arrowstreet Capital | $616,777 | 0.0% |
Exited
| Adage Capital Partners | $29.74M | was 0.0% |
| Point72 Asset Management | $609,627 | 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)
Oct 21
Bitterman Kevin
Director · 266 sh · $21,341
Oct 21
Bitterman Kevin
Director · 11.47K sh · $920,238
Oct 21
Bitterman Kevin
Director · 13.78K sh · $1.11M
Oct 20
Bitterman Kevin
Director · 2.87K sh · $229,377
Oct 20
Bitterman Kevin
Director · 55 sh · $4,397
Oct 20
Bitterman Kevin
Director · 2.39K sh · $190,921
Oct 19
Bitterman Kevin
Director · 5.94K sh · $474,782
Oct 19
Bitterman Kevin
Director · 115 sh · $9,197
Oct 19
Bitterman Kevin
Director · 4.94K sh · $395,212
Sep 11
Bitterman Kevin
Director · 27.14K sh · $1.90M
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: Q4 2025 ·
Methodology ·
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