IRON — DISC MEDICINE INC
As of Q2 2026, 30 SEC-registered investment managers reported holding IRON (DISC MEDICINE INC) in their latest 13F filings, with a combined reported value of $1.01B across 15.71M shares. That is +10.8% by share count (+1.53M shares) versus the previous quarter, while reported value moved +25.6%. Ownership is concentrated: the five largest holders account for 85.1% of reported value and the top ten for 93.0%.
Compared with the prior quarter, 4 opened new positions, 13 added to existing stakes, 9 trimmed, 2 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.
IRON is classified in the Health Care sector.
All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.
| Fund | Quarter | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|---|
| Fidelity Management & Research (FMR) history | Q2 2026 | 4.89M | $357.98M | 0.02% | Reduce |
| BlackRock Inc history | Q2 2026 | 2.47M | $180.50M | 0.00% | Add |
| Vanguard Group history | Q4 2025 | 1.77M | $140.37M | 0.00% | Add |
| JPMorgan Chase & Co history | Q2 2026 | 1.88M | $139.87M | 0.02% | New |
| Wellington Management Group history | Q2 2026 | 1.74M | $127.36M | 0.02% | Hold |
| Geode Capital Management history | Q2 2026 | 789.72K | $57.77M | 0.00% | Add |
| Northern Trust Corp history | Q2 2026 | 264.99K | $19.38M | 0.00% | Add |
| Charles Schwab Investment Management history | Q2 2026 | 257.38K | $18.82M | 0.00% | Add |
| Citadel Advisors history | Q2 2026 | 242.31K | $17.72M | 0.00% | Add |
| Balyasny Asset Management history | Q4 2025 | 221.76K | $17.61M | 0.02% | Reduce |
| BNY Mellon history | Q2 2026 | 204.73K | $14.97M | 0.00% | Hold |
| Two Sigma Investments history | Q2 2026 | 136.75K | $10.00M | 0.01% | New |
| Bank of America Corp history | Q2 2026 | 135.11K | $9.88M | 0.00% | Reduce |
| UBS Group AG history | Q2 2026 | 110.97K | $8.12M | 0.00% | Add |
| Millennium Management history | Q2 2026 | 106.25K | $7.77M | 0.00% | Add |
| Goldman Sachs Group history | Q2 2026 | 97.38K | $7.12M | 0.00% | Reduce |
| Morgan Stanley history | Q2 2026 | 91.59K | $6.70M | 0.00% | Reduce |
| Franklin Resources history | Q1 2024 | 102.02K | $6.35M | 0.00% | Reduce |
| Casdin Capital history | Q2 2026 | 65.00K | $4.75M | 0.24% | Hold |
| Moore Capital Management history | Q2 2026 | 57.80K | $4.23M | 0.07% | Hold |
New Positions (Q2 2026)
- JPMorgan Chase & Co 1.88M sh · $139.87M
- Two Sigma Investments 136.75K sh · $10.00M
- Marshall Wace 34.39K sh · $2.52M
- D. E. Shaw & Co 6.03K sh · $440.81K
Fully Exited (vs previous quarter)
- Renaissance Technologies sold 31.82K sh · $2.03M
- Janus Henderson Group sold 11.55K sh · $739.46K
Fund Position History — shares by quarter (top 20 funds)
| Fund | Q4 2022 | Q1 2023 | Q2 2023 | Q3 2023 | Q4 2023 | Q1 2024 | Q2 2024 | Q3 2024 | Q4 2024 | Q1 2025 | Q2 2025 | Q3 2025 | Q4 2025 | Q1 2026 | Q2 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fidelity Management & Research (FMR) | 193.24K | 151.70K | 323.05K | 305.43K | 217.41K | 403.53K | 413.10K | 406.81K | 1.87M | 3.22M | 3.25M | 4.94M | 5.45M | 5.59M | 4.89M |
| BlackRock Inc | — | — | — | — | — | — | — | 1.85M | 1.86M | 2.09M | 2.04M | 2.02M | 2.27M | 2.27M | 2.47M |
| JPMorgan Chase & Co | 1 | — | 6.00K | 6.03K | 16.03K | 12.27K | 14.00K | 16.25K | 61.02K | 759.34K | 843.62K | 752.88K | 1.58M | — | 1.88M |
| Wellington Management Group | — | — | 43.27K | 54.74K | 177.73K | 670.48K | 1.76M | 1.84M | 1.40M | 2.34M | 1.43M | 1.41M | 1.52M | 1.74M | 1.74M |
| Geode Capital Management | 27.16K | 47.04K | 147.06K | 214.40K | 229.42K | 245.77K | 403.74K | 474.72K | 472.71K | 571.98K | 598.59K | 628.15K | 684.96K | 744.22K | 789.72K |
| Northern Trust Corp | — | — | 69.97K | 89.04K | 95.26K | 97.39K | 98.38K | 170.72K | 187.02K | 208.81K | 219.09K | 219.49K | 228.07K | 247.19K | 264.99K |
| Charles Schwab Investment Management | — | — | 20.56K | 84.20K | 89.72K | 92.09K | 141.15K | 160.55K | 165.07K | 194.72K | 204.24K | 226.66K | 247.04K | 251.19K | 257.38K |
| Citadel Advisors | 56.65K | 171.24K | 651.32K | 310.43K | 206.02K | 387.12K | 338.82K | 415.02K | 604.37K | 63.61K | 20.50K | 54.29K | 100.39K | 131.13K | 242.31K |
| BNY Mellon | — | — | 24.98K | 30.55K | 30.50K | 26.96K | 51.05K | 52.91K | 57.26K | 63.50K | 71.50K | 64.80K | 67.71K | 204.97K | 204.73K |
| Two Sigma Investments | — | 24.15K | 40.26K | 9.30K | 23.09K | 14.71K | — | — | — | — | — | — | — | — | 136.75K |
| Bank of America Corp | 2 | 2.68K | 558.10K | 53.82K | 31.96K | 213.69K | 60.59K | 70.09K | 35.34K | 53.81K | 168.82K | 161.18K | 135.99K | 166.78K | 135.11K |
| UBS Group AG | 7.12K | 5.24K | 11.69K | 19.02K | 13.62K | 63.00K | 77.68K | 33.09K | 24.34K | 72.63K | 145.55K | 171.62K | 116.11K | 98.62K | 110.97K |
| Millennium Management | 14.76K | 22.11K | — | — | 20.70K | 101.20K | — | — | 7.88K | 108.50K | 36.59K | 161.00K | 208.78K | 83.26K | 106.25K |
| Goldman Sachs Group | — | 21.67K | — | 27.35K | 62.17K | 68.40K | 54.25K | 171.57K | 171.81K | 130.75K | 225.86K | 529.08K | 754.20K | 639.84K | 97.38K |
| Morgan Stanley | 821 | 9.81K | 43.53K | 49.56K | 112.39K | 136.63K | 98.93K | 69.94K | 150.02K | 170.21K | 110.68K | 56.08K | 74.83K | 94.26K | 91.59K |
| Casdin Capital | — | — | — | — | — | — | — | — | — | — | — | — | — | 65.00K | 65.00K |
| Moore Capital Management | — | — | — | — | — | — | — | — | — | — | — | — | — | 57.80K | 57.80K |
| Invesco Ltd | — | — | 110.63K | 161.21K | 114.07K | 71.44K | 5.64K | 5.63K | 10.88K | 13.83K | 16.82K | 21.44K | 61.07K | 30.64K | 42.06K |
| Citigroup Inc | 5.09K | 25.08K | 2.30K | 26.55K | 16.68K | 89.25K | 14.13K | 14.88K | 42.63K | 42.98K | 16.11K | 4.04K | 36.18K | 7.74K | 38.32K |
| Lazard Asset Management | — | — | — | — | — | — | — | — | — | — | — | — | 58.05K | 39.40K | 35.03K |
▲ Bought Low (fund opened/added, stock rose ≥5% next quarter) ▼ Sold High (fund reduced, stock fell ≥5% next quarter)
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