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Disclosery

IRON DISC MEDICINE INC

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Stock (common), issuer CIK 1816736

197 managers (204 13F filers) reported a position in IRON shares at 2026-03-31, 41,898,149 shares in all. 39 filers opened a position and 38 filers sold out during the quarter.

Managers
197
13F filers
204
New
39
Added
81
Reduced
44
Sold out
38
Shares held by filers
41,898,149

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
FMR LLCin group FMR LLC5,586,894$357M0.02%+136,67213F-HRTimelineGroup
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.2,450,221$157M1.66%+474,08913F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.2,273,831$145M<0.01%-1,14913F-HRTimelineGroup
VANGUARD GROUP INCgroup of 6 filers holding1,874,790$120MnewTimeline
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…1,735,376$111M0.02%+217,10213F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,698,244$109M<0.01%+510,25313F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/1,549,350$99.1M0.01%-148,65513F-HRTimeline
Atlas Venture Life Science Advisors, LLC1,513,875$96.8M12.25%013F-HRTimeline
Frazier Life Sciences Management, L.P.1,354,852$86.6M2.23%+94,85213F-HRTimeline
TCG Crossover Management, LLC1,341,862$85.8M2.45%new13F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,371,480$83.4M0.01%-209,64713F-HR/ATimelineGroup
BVF INC/ILin group BVF INC/IL1,272,312$81.4M2.59%+622,31213F-HRTimelineGroup
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC1,067,550$68.3M1.49%013F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.988,401$63.2M1.75%013F-HRTimelineGroup
Woodline Partners LP958,281$61.3M0.23%+44813F-HR/ATimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC744,222$47.6M<0.01%+59,26413F-HRTimelineGroup
Vestal Point Capital, LP700,000$44.8M1.25%-35,00013F-HRTimeline
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…657,000$42M0.5%+145,83713F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC639,842$40.9M0.01%-114,35313F-HRTimelineGroup
JENNISON ASSOCIATES LLC610,382$39M0.03%+78,30313F-HRTimeline
Logos Global Management LP560,000$35.8M1.84%+50,00013F-HRTimeline
Assenagon Asset Management S.A.546,247$34.9M0.06%+188,41113F-HRTimeline
ARMISTICE CAPITAL, LLC536,000$34.3M1.13%+36,60913F-HRTimeline
Bellevue Group AGin group Bellevue Group AG459,314$29.4M0.7%new13F-HRTimelineGroup
Saturn V Capital Management LP449,926$28.8M5.21%+151,49713F-HRTimeline
Opaleye Management Inc.421,000$26.9M3.55%+221,00013F-HRTimeline
Palo Alto Investors LP401,719$25.7M3.93%+84,26313F-HRTimeline
EVENTIDE ASSET MANAGEMENT, LLC395,572$25.3M0.42%+18013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP394,447$25.2M0.01%+170,87213F-HRTimelineGroup
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…387,005$24.7M0.03%-7,36913F-HRTimelineGroup
Aberdeen Group plcin group Aberdeen Group plc375,614$24M0.04%+141,25613F-HRTimelineGroup
Foresite Capital Management V, LLCin group Foresite Capital Management V…374,069$23.9M8.83%+75,00013F-HRTimelineGroup
BAKER BROS. ADVISORS LPin group BAKER BROS. ADVISORS LP349,657$22.4M0.13%+12,60713F-HRTimelineGroup
LOOMIS SAYLES & CO L Pin group LOOMIS SAYLES & CO L P317,222$20.3M0.03%+34,81313F-HRTimelineGroup
Checkpoint Capital L.P.286,661$18.3M6.58%-166,33113F-HRTimeline
Octagon Capital Advisors LP270,000$17.3M1.91%new13F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co251,195$16.1M<0.01%+4,15613F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP247,195$15.8M<0.01%+19,12513F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding209,511$13.4M-20,952Timeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp204,968$13.1M<0.01%+137,26113F-HRTimelineGroup
SILVERARC CAPITAL MANAGEMENT, LLCin group SILVERARC CAPITAL MANAGEMENT,…196,028$12.5M1.48%new13F-HRTimelineGroup
Ensign Peak Advisors, Inc191,487$12.2M0.02%+14,43713F-HR/ATimeline
Integral Health Asset Management, LLC170,000$10.9M0.58%new13F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/166,775$10.7M<0.01%+30,78913F-HRTimelineGroup
Bain Capital Life Sciences Investors, L…in group Bain Capital Life Sciences In…141,234$9.03M0.81%new13F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS127,737$8.17M0.01%+5,58413F-HRTimelineGroup
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.125,000$7.99M0.02%+75,00013F-HRTimelineGroup
Catalio Capital Management, LP122,978$7.86M1.64%+12,55113F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC108,286$6.92M0.15%+98,96213F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC97,930$6.26M<0.01%-2,46513F-HRTimelineGroup
DNB Asset Management ASin group DNB Asset Management AS96,755$6.19M0.02%+12,50013F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY94,264$6.03M<0.01%+19,43813F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC83,259$5.32M<0.01%-101,52013F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC81,829$5.23M0.08%new13F-HRTimelineGroup
Sofinnova Investments, Inc.78,320$5.01M0.25%-32,69013F-HRTimeline
Freestone Grove Partners LP68,687$4.39M0.03%new13F-HRTimeline
iA Global Asset Management Inc.66,243$4.24M0.06%-18713F-HRTimeline
Sio Capital Management, LLC65,203$4.17M0.6%+7,61713F-HRTimeline
Casdin Capital, LLC65,000$4.16M0.31%new13F-HRTimeline
KVP Capital Advisors, LP58,250$3.72M2.78%013F-HRTimeline
MOORE CAPITAL MANAGEMENT, LP57,796$3.7M0.13%new13F-HRTimeline
Rafferty Asset Management, LLC53,869$3.44M0.01%+17,77613F-HRTimeline
SPHERA FUNDS MANAGEMENT LTD.in group SPHERA FUNDS MANAGEMENT LTD.53,538$3.42M0.59%new13F-HRTimelineGroup
NEXTBio Capital Management LP52,655$3.37M1.56%+9,87713F-HRTimeline
Nuveen, LLCin group TIAA51,380$3.29M<0.01%+2,90913F-HRTimelineGroup
Burkehill Global Management, LP50,000$3.2M0.16%013F-HRTimeline
Atle Fund Management AB107,255$3.19M1.03%+59,28813F-HRTimeline
SCHRODER INVESTMENT MANAGEMENT GROUP50,959$3.1M<0.01%+85613F-HRTimeline
Swiss National Bank48,000$3.07M<0.01%013F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC45,837$2.93M<0.01%-37,14713F-HR/ATimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC44,700$2.73M<0.01%-35,57413F-HRTimelineGroup
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …39,910$2.55M<0.01%-29313F-HRTimelineGroup
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC39,400$2.52M<0.01%-18,65313F-HRTimelineGroup
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …38,006$2.43M<0.01%+10,70513F-HRTimelineGroup
SEVEN GRAND MANAGERS, LLC35,000$2.24M0.15%013F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd34,418$2.2M0.04%+11,32413F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…34,382$2.2M<0.01%+11,12613F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC33,267$2.13M<0.01%-66,34513F-HRTimelineGroup
RHUMBLINE ADVISERS33,058$2.11M<0.01%+3,22513F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …32,493$2.08M<0.01%-20,01713F-HRTimelineGroup
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…32,406$2.04M0.02%-17,30713F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC31,820$2.03M<0.01%-31,00013F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC31,709$2.03M<0.01%+15,95513F-HRTimelineGroup
ALPS ADVISORS INCin group ALPS ADVISORS INC31,058$1.99M0.01%+5613F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL31,002$1.98M0.01%-35,12313F-HRTimeline
Invesco Ltd.in group Invesco Ltd.30,638$1.96M<0.01%-30,43213F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.24,540$1.95M<0.01%013F-HRTimeline
TD Asset Management Inc30,476$1.95M<0.01%-39,15813F-HRTimeline
RTW INVESTMENTS, LP30,000$1.92M0.02%013F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC29,218$1.87M<0.01%-47,12013F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/28,773$1.84M<0.01%+3,94713F-HRTimelineGroup
Nantahala Capital Management, LLCin group Nantahala Capital Management,…25,653$1.64M0.1%-107,14713F-HRTimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…25,292$1.62M<0.01%+9213F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\24,401$1.56M<0.01%+3,87813F-HRTimelineGroup
PROFUND ADVISORS LLC23,972$1.53M0.06%+10,49413F-HRTimeline
ALGERT GLOBAL LLC22,680$1.45M0.02%new13F-HR/ATimeline
BOOTHBAY FUND MANAGEMENT, LLC21,378$1.37M0.03%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc19,377$1.24M<0.01%-4,27613F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…18,993$1.21M0.01%+2,83713F-HRTimeline
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding18,689$1.18M+3,144Timeline
Zimmer Partners, LP16,700$1.07M0.03%-10,80013F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO15,510$992K<0.01%new13F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding15,406$985K+2,364Timeline
MetLife Investment Management, LLCin group MetLife Investment Management…15,065$963K<0.01%+1,23313F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN14,690$939K<0.01%-18,57513F-HR/ATimelineGroup
Headlands Technologies LLC14,611$934K0.11%new13F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD14,288$914K<0.01%-2,81813F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC14,155$905K<0.01%+14813F-HRTimelineGroup
SummitTX Capital, L.P.13,820$884K0.03%new13F-HRTimeline
Atom Investors LP12,162$778K0.06%new13F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson11,555$739K<0.01%013F-HR/ATimelineGroup
SG Americas Securities, LLC11,226$718K<0.01%-9,89613F-HRTimeline
Man Group plcin group Man Group plc10,006$640K<0.01%new13F-HRTimelineGroup
Ghisallo Capital Management LLC10,000$639K0.02%013F-HRTimeline
Engineers Gate Manager LP9,270$593K0.01%+3,81013F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…8,704$557K<0.01%013F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND8,576$548K<0.01%-5,40913F-HRTimeline
China Universal Asset Management Co., L…8,372$535K0.04%+62113F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…8,317$532K<0.01%+1113F-HRTimelineGroup
Lion Point Capital, LP8,100$518K3.1%013F-HRTimeline
PSP Research LLC8,000$512K0.36%new13F-HRTimeline
CITIGROUP INCin group CITIGROUP INC7,742$495K<0.01%-28,43413F-HRTimelineGroup
Police & Firemen's Retirement System of…7,474$478K<0.01%+75813F-HRTimeline
E Fund Management Co., Ltd.6,772$433K0.01%13F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM6,684$427K<0.01%-11413F-HRTimeline
INCEPTIONR LLC6,489$415K0.1%new13F-HRTimeline
EntryPoint Capital, LLC6,371$407K0.12%new13F-HRTimeline
CAPSTONE INVESTMENT ADVISORS, LLCin group CAPSTONE INVESTMENT ADVISORS,…6,265$401K<0.01%new13F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…6,017$385K0.01%+5,24113F-HRTimelineGroup
STRS OHIO6,000$384K<0.01%013F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC5,868$375K<0.01%-4,04213F-HRTimeline
ProShare Advisors LLC5,688$364K<0.01%-53913F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…5,640$361K<0.01%+2,65213F-HRTimeline
KLP KAPITALFORVALTNING AS5,200$332K<0.01%013F-HRTimeline
Eleva Capital SAS5,115$327K0.1%13F-HRTimeline
Entropy Technologies, LP4,788$306K0.01%+43113F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC4,420$283K<0.01%-8,76613F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC4,265$273K<0.01%new13F-HRTimelineGroup
Fiduciary Trust Coin group Fiduciary Trust Co4,051$259K<0.01%013F-HRTimelineGroup
AlphaCentric Advisors LLC3,972$254K0.25%+21613F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC3,952$253K<0.01%-2,54213F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC3,786$242K0.01%new13F-HRTimelineGroup
Creative Planningin group Creative Planning3,769$241K<0.01%-9513F-HRTimelineGroup
Bayforest Capital Ltd3,564$228K0.26%new13F-HRTimeline
Seven Fleet Capital Management LP3,231$207K0.06%new13F-HR/ATimeline
TEACHER RETIREMENT SYSTEM OF TEXAS3,144$201K<0.01%-47013F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…2,967$190K0.05%+7013F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…2,634$168K<0.01%-21,04913F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,248$144K<0.01%+18913F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP1,627$97.8K<0.01%new13F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\1,185$75.8K<0.01%+913F-HRTimelineGroup
CWM, LLCin group CWM, LLC1,035$66.2K<0.01%+213F-HRTimelineGroup
KBC Group NVin group KBC Group NV1,011$65K<0.01%013F-HRTimelineGroup
Caitong International Asset Management …1,001$64K0.01%+76913F-HRTimeline
GF FUND MANAGEMENT CO. LTD.848$54.2K<0.01%+10613F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…730$47K<0.01%013F-HRTimeline
Aquatic Capital Management LLC693$44.3K<0.01%new13F-HRTimeline
Allworth Financial LP599$38.3K<0.01%+59213F-HRTimeline
Steward Partners Investment Advisory, L…528$33.8K<0.01%013F-HRTimeline
ANTIPODES PARTNERS Ltd476$30.4K<0.01%+5713F-HRTimeline
SUMMIT SECURITIES GROUP LLC287$18.4K0.01%new13F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.275$17.6K<0.01%+213F-HRTimelineGroup
GAMMA Investing LLC268$17.1K<0.01%-3613F-HRTimeline
Kemnay Advisory Services Inc.246$15.7K<0.01%+17713F-HRTimeline
NISA INVESTMENT ADVISORS, LLC240$15.3K<0.01%013F-HRTimeline
J.Safra Asset Management Corp194$12.4K<0.01%+13113F-HRTimeline
Sterling Capital Management LLC178$11.4K<0.01%+1513F-HRTimeline
Larson Financial Group LLC123$7.87K<0.01%+1113F-HRTimeline
Smartleaf Asset Management LLC92$5.59K<0.01%+1913F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.82$5.24K<0.01%+1213F-HR/ATimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…71$4.54K<0.01%+413F-HR/ATimelineGroup
Farther Finance Advisors, LLC44$2.85K<0.01%-913F-HRTimeline
ROTHSCHILD INVESTMENT LLC41$2.62K<0.01%+113F-HRTimeline
Aster Capital Management (DIFC) Ltd52$2.58K<0.01%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA24$2K<0.01%-77813F-HRTimelineGroup
FIRST HORIZON CORP30$1.92K<0.01%+213F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…29$1.86K<0.01%new13F-HRTimelineGroup
Parkside Financial Bank & Trust20$1.28K<0.01%013F-HRTimeline
Versant Capital Management, Inc19$1.22K<0.01%013F-HRTimeline
JPL Wealth Management, LLC17$1.09K<0.01%new13F-HR/ATimeline
Geneos Wealth Management Inc.13$831<0.01%new13F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC12$767<0.01%013F-HRTimelineGroup
GROUP ONE TRADING LLC11$703<0.01%new13F-HRTimeline
Cornerstone Financial Management LLC11$703<0.01%013F-HR/ATimeline
Bare Financial Services, Inc9$575<0.01%013F-HRTimeline
CAPITAL & PLANNING, LLC6$384<0.01%new13F-HRTimeline
Root Financial Partners, LLC4$256<0.01%new13F-HRTimeline
Essential Partners LLC4$256<0.01%013F-HRTimeline
MAI Capital Management3$192<0.01%new13F-HRTimeline
IFP Advisors, Inc3$192<0.01%013F-HRTimeline
Keating Financial Advisory Services, In…3$192<0.01%new13F-HRTimeline
SBI Securities Co., Ltd.1$64<0.01%013F-HRTimeline
True Wealth Design, LLC1$64<0.01%013F-HRTimeline
TWIN PEAKS WEALTH ADVISORS, LLC1$64<0.01%new13F-HRTimeline
Hughes Financial Services, LLC1$64<0.01%013F-HRTimeline
Covestor Ltd2$00%013F-HRTimelineValue filed as zero, left out of ratios.
NOMURA ASSET MANAGEMENT CO LTDin group NOMURA ASSET MANAGEMENT CO LTD0$00%013F-HRTimelineGroupValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.