DISC MEDICINE INC (IRON) Institutional Shareholders
DISC MEDICINE INC (IRON) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $3.13B in IRON holdings during the latest filing period.
Fmr Llc is currently the largest disclosed institutional shareholder of IRON tracked by InsiderSet, reporting ownership valued at approximately $357.98M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $340.31M, representing an estimated loss of -4.94% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 50% of the total disclosed IRON value among the investors covered in this analysis. Major shareholders include Fmr Llc, Blackrock, Inc., Ra Capital Management, L.P., and several other long-term asset managers with concentrated positions in DISC MEDICINE INC (IRON).
This page ranks the largest institutional IRON shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
212
Total Reported Value
$3.13B
Largest Holder
Fmr Llc
Largest Position
$357.98M
Insider Transactions (90d)
37
Latest Filing Quarter
Q2 2026
New Institutional Positions
69
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Fmr Llc | 0.02% | 4,894,473 | $357,981,753 | $340,312,708 | -$17,669,045 | -4.94% | |
| Blackrock, Inc. | 0.00% | 2,467,899 | $180,502,133 | $171,593,017 | -$8,909,116 | -4.94% | |
| Ra Capital Management, L.P. | 1.56% | 2,450,221 | $179,209,164 | $170,363,866 | -$8,845,298 | -4.94% | |
| Jpmorgan Chase & Co | 0.01% | 1,875,795 | $139,868,053 | $130,424,026 | -$9,444,027 | -6.75% | |
| Price T Rowe Associates Inc | 0.01% | 1,875,399 | $137,168,000 | $130,396,492 | -$6,771,508 | -4.94% | |
| Wellington Management Group Llp | 0.02% | 1,741,351 | $127,362,413 | $121,076,135 | -$6,286,278 | -4.94% | |
| State Street Corp | 0.00% | 1,648,836 | $120,595,865 | $114,643,567 | -$5,952,298 | -4.94% | |
| Vestal Point Capital, Lp | 2.65% | 1,550,000 | $113,367,000 | $107,771,500 | -$5,595,500 | -4.94% | |
| Atlas Venture Life Science Advisors, Llc | 12.56% | 1,513,875 | $110,724,818 | $105,259,729 | -$5,465,089 | -4.94% | |
| Vanguard Capital Management Llc | 0.00% | 1,369,027 | $100,130,635 | $95,188,447 | -$4,942,188 | -4.94% | |
| Frazier Life Sciences Management, L.P. | 2.16% | 1,354,852 | $99,093,875 | $94,202,860 | -$4,891,015 | -4.94% | |
| Tcg Crossover Management, Llc | 2.36% | 1,341,862 | $98,143,787 | $93,299,665 | -$4,844,122 | -4.94% | |
| Bvf Inc/Il | 2.16% | 1,153,612 | $84,375,182 | $80,210,642 | -$4,164,540 | -4.94% | |
| Woodline Partners Lp | 0.22% | 958,281 | $70,088,672 | $66,629,278 | -$3,459,394 | -4.94% | |
| Siren, L.L.C. | 1.32% | 888,401 | $64,977,649 | $61,770,522 | -$3,207,127 | -4.94% | |
| Logos Global Management Lp | 2.76% | 875,000 | $63,997,500 | $60,838,750 | -$3,158,750 | -4.94% | |
| Opaleye Management Inc. | 5.66% | 855,000 | $62,534,700 | $59,448,150 | -$3,086,550 | -4.94% | |
| Geode Capital Management, Llc | 0.00% | 789,724 | $57,772,342 | $54,909,510 | -$2,862,832 | -4.96% | |
| Deerfield Management Company, L.P. | 0.50% | 657,000 | $48,052,980 | $45,681,210 | -$2,371,770 | -4.94% | |
| Dimensional Fund Advisors Lp | 0.01% | 569,018 | $41,622,451 | $39,563,822 | -$2,058,629 | -4.95% | |
| Bellevue Group Ag | 0.86% | 560,000 | $40,958,400 | $38,936,800 | -$2,021,600 | -4.94% | |
| Saturn V Capital Management Lp | 5.50% | 524,730 | $38,378,752 | $36,484,477 | -$1,894,275 | -4.94% | |
| Armistice Capital, Llc | 0.93% | 460,000 | $33,644,400 | $31,983,800 | -$1,660,600 | -4.94% | |
| Jennison Associates Llc | 0.02% | 439,520 | $32,146,492 | $30,559,826 | -$1,586,666 | -4.94% | |
| Aberdeen Group Plc | 0.04% | 438,174 | $32,048,046 | $30,466,238 | -$1,581,808 | -4.94% | |
| Palo Alto Investors Lp | 4.21% | 416,646 | $30,473,488 | $28,969,396 | -$1,504,092 | -4.94% | |
| Eventide Asset Management, Llc | 0.39% | 395,651 | $28,938,480 | $27,509,614 | -$1,428,866 | -4.94% | |
| Pictet Asset Management Holding Sa | 0.03% | 385,375 | $28,186,328 | $26,795,124 | -$1,391,204 | -4.94% | |
| Assenagon Asset Management S.A. | 0.04% | 384,158 | $28,097,316 | $26,710,506 | -$1,386,810 | -4.94% | |
| Loomis Sayles & Co L P | 0.04% | 381,864 | $27,929,533 | $26,551,004 | -$1,378,529 | -4.94% | |
| Foresite Capital Management V, Llc | 7.55% | 374,069 | $27,359,407 | $26,009,018 | -$1,350,389 | -4.94% | |
| Orbimed Advisors Llc | 0.50% | 357,535 | $26,150,110 | $24,859,409 | -$1,290,701 | -4.94% | |
| Baker Bros. Advisors Lp | 0.13% | 349,657 | $25,573,913 | $24,311,651 | -$1,262,262 | -4.94% | |
| Vanguard Portfolio Management Llc | 0.00% | 281,937 | $20,620,872 | $19,603,080 | -$1,017,792 | -4.94% | |
| Octagon Capital Advisors Lp | 1.81% | 270,000 | $19,747,800 | $18,773,100 | -$974,700 | -4.94% | |
| Northern Trust Corp | 0.00% | 264,990 | $19,381,368 | $18,424,755 | -$956,613 | -4.94% | |
| Charles Schwab Investment Management Inc | 0.00% | 257,382 | $18,824,919 | $17,895,770 | -$929,149 | -4.94% | |
| Checkpoint Capital L.P. | 4.51% | 240,125 | $17,562,743 | $16,695,891 | -$866,852 | -4.94% | |
| Vanguard Fiduciary Trust Co | 0.00% | 225,198 | $16,470,982 | $15,658,017 | -$812,965 | -4.94% | |
| Citadel Advisors Llc | 0.01% | 209,308 | $15,308,787 | $14,553,185 | -$755,602 | -4.94% | |
| Bank Of New York Mellon Corp | 0.00% | 204,727 | $14,973,763 | $14,234,668 | -$739,095 | -4.94% | |
| Bnp Paribas Financial Markets | 0.01% | 184,695 | $13,508,592 | $12,841,843 | -$666,749 | -4.94% | |
| Ensign Peak Advisors, Inc | 0.02% | 191,487 | $12,243,679 | $13,314,091 | +$1,070,412 | +8.74% | |
| Sofinnova Investments, Inc. | 0.57% | 146,239 | $10,695,920 | $10,167,998 | -$527,922 | -4.94% | |
| Bain Capital Life Sciences Investors, Llc | 0.61% | 141,234 | $10,329,855 | $9,820,000 | -$509,855 | -4.94% | |
| Two Sigma Investments, Lp | 0.01% | 136,750 | $10,001,895 | $9,508,228 | -$493,668 | -4.94% | |
| Bank Of America Corp | 0.00% | 135,111 | $9,882,018 | $9,394,268 | -$487,750 | -4.94% | |
| Alyeska Investment Group, L.P. | 0.02% | 125,000 | $9,142,500 | $8,691,250 | -$451,250 | -4.94% | |
| Catalio Capital Management, Lp | 1.55% | 110,427 | $8,769,008 | $7,677,989 | -$1,091,019 | -12.44% | |
| Ubs Group Ag | 0.00% | 110,971 | $8,116,419 | $7,715,814 | -$400,605 | -4.94% |
Frequently asked questions about IRON
Who owns the most IRON stock?
The largest holders of IRON are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for DISC MEDICINE INC (IRON).
Is IRON widely held by superinvestors?
Many widely followed stocks like IRON appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly IRON is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.