Skip to content
Disclosery

IRON DISC MEDICINE INC

Follow

Stock (common), issuer CIK 1816736

165 managers (168 13F filers) reported a position in IRON shares at 2025-09-30, 34,220,271 shares in all. 25 filers opened a position and 9 filers sold out during the quarter.

Managers
165
13F filers
168
New
25
Added
62
Reduced
45
Sold out
9
Shares held by filers
34,220,271

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, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, 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 LLC4,935,159$326M0.02%+1,689,44913F-HRTimelineGroup
Atlas Venture Life Science Advisors, LLC2,142,617$142M18.81%-241,83913F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.2,019,283$133M<0.01%-25,54413F-HRTimelineGroup
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.1,577,106$104M1.28%013F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC1,448,059$95.7M<0.01%+51,32313F-HRTimelineGroup
Frazier Life Sciences Management, L.P.1,438,534$95.1M2.85%-216,30013F-HRTimeline
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC1,415,020$93.5M2.24%013F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…1,410,077$93.2M0.02%-22,01313F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/1,326,429$87.7M0.01%-189,19613F-HRTimeline
STATE STREET CORPin group STATE STREET CORP1,045,597$69.1M<0.01%+115,82913F-HRTimelineGroup
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…919,403$60.8M0.93%013F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.913,401$60.4M2.36%-186,00013F-HRTimelineGroup
Woodline Partners LP866,955$57.3M0.27%013F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO752,879$49.8M<0.01%-90,73713F-HR/ATimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC628,151$41.5M<0.01%+29,56213F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC529,081$35M0.01%+303,22513F-HRTimelineGroup
Vestal Point Capital, LP500,000$33M1.5%+360,00013F-HRTimeline
TCG Crossover Management, LLC465,257$30.7M1.51%013F-HRTimeline
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…450,000$29.7M0.05%013F-HRTimelineGroup
Logos Global Management LP450,000$29.7M2.94%-250,00013F-HRTimeline
ARMISTICE CAPITAL, LLC436,000$28.8M0.9%013F-HRTimeline
Checkpoint Capital L.P.430,000$28.4M9.52%+165,00013F-HRTimeline
First Turn Management, LLC397,693$26.3M3.95%+98,22913F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson361,704$23.9M0.01%-1,192,25713F-HRTimelineGroup
Saturn V Capital Management LP340,897$22.5M4.94%-55,21813F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management338,101$22.3M0.05%new13F-HRTimelineGroup
BAKER BROS. ADVISORS LPin group BAKER BROS. ADVISORS LP337,050$22.3M0.16%013F-HRTimelineGroup
EVENTIDE ASSET MANAGEMENT, LLC308,043$20.4M0.33%+1313F-HRTimeline
Foresite Capital Management V, LLCin group Foresite Capital Management V…299,069$19.8M18.17%013F-HRTimelineGroup
Nantahala Capital Management, LLCin group Nantahala Capital Management,…287,800$19M1.17%013F-HRTimelineGroup
Sio Capital Management, LLC284,787$18.8M4.76%013F-HRTimeline
UBS Group AGgroup of 2 filers holding263,003$17.4M-4,130Timeline
Paradigm Biocapital Advisors LPin group Paradigm Biocapital Advisors …247,716$16.4M0.48%-963,25513F-HRTimelineGroup
First Light Asset Management, LLC231,186$15.3M1.44%new13F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP230,423$15.2M<0.01%+37,56713F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co226,655$15M<0.01%+22,41413F-HRTimelineGroup
Palo Alto Investors LP224,300$14.8M2.74%+78,60913F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP219,489$14.5M<0.01%+39413F-HRTimelineGroup
Catalio Capital Management, LP216,527$14.3M2.65%+185,86613F-HRTimeline
Opaleye Management Inc.193,773$12.8M1.81%+7,35513F-HRTimeline
TimesSquare Capital Management, LLC182,170$12M0.17%new13F-HRTimeline
Ensign Peak Advisors, Inc177,050$11.7M0.02%+35,50513F-HR/ATimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/161,184$10.7M<0.01%-7,63813F-HR/ATimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC161,000$10.6M0.01%+139,40713F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC149,864$9.9M0.01%-47,96013F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC141,479$9.35M<0.01%+54,99213F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC107,203$7.08M<0.01%+20,64513F-HR/ATimelineGroup
Blue Owl Capital Holdings LP102,260$6.76M2.1%-20,00013F-HRTimeline
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…102,185$6.75M0.04%new13F-HR/ATimelineGroup
Zimmer Partners, LP90,163$5.96M0.15%013F-HRTimeline
Nicholas Investment Partners, LP88,003$5.82M0.44%+33,55813F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC74,350$4.91M<0.01%-47,17013F-HRTimelineGroup
Patient Square Capital LP74,000$4.89M1.31%013F-HRTimeline
SCHRODER INVESTMENT MANAGEMENT GROUP67,196$4.37M<0.01%-15,25513F-HRTimeline
iA Global Asset Management Inc.65,512$4.33M0.06%+65,19013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp64,800$4.28M<0.01%-6,70213F-HRTimelineGroup
Exome Asset Management LLC61,356$4.05M2.68%013F-HRTimeline
TD Asset Management Inc59,248$3.92M<0.01%+6,20013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY56,075$3.71M<0.01%-54,60413F-HR/ATimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC50,394$3.33M<0.01%new13F-HRTimelineGroup
Nuveen, LLCin group TIAA47,694$3.15M<0.01%-2,57613F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …47,577$3.14M<0.01%-4,25913F-HRTimelineGroup
Swiss National Bank43,600$2.88M<0.01%+70013F-HRTimeline
Y-Intercept (Hong Kong) Ltd43,287$2.86M0.07%+33,90513F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS37,610$2.49M<0.01%+32,90713F-HRTimelineGroup
Rafferty Asset Management, LLC37,302$2.46M0.01%+5,81313F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding36,350$2.4M-39,647Timeline
RHUMBLINE ADVISERS34,490$2.28M<0.01%-1,26513F-HRTimeline
PFM Health Sciences, LP32,539$2.15M0.18%+1,74013F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc32,061$2.12M<0.01%013F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC27,938$1.85M<0.01%new13F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN27,055$1.79M<0.01%+4,59413F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc25,147$1.66M<0.01%+1,05013F-HRTimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…25,146$1.66M<0.01%+613F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.24,540$1.62M<0.01%+40013F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…22,093$1.46M<0.01%+1,84313F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND21,490$1.42M<0.01%+4,63813F-HRTimeline
Invesco Ltd.in group Invesco Ltd.21,443$1.42M<0.01%+4,62613F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC21,274$1.41M<0.01%new13F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\18,886$1.25M<0.01%+2,16913F-HRTimelineGroup
PRELUDE CAPITAL MANAGEMENT, LLC18,156$1.2M0.09%013F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/17,785$1.18M<0.01%+6,79713F-HRTimelineGroup
ALPS ADVISORS INCin group ALPS ADVISORS INC16,792$1.11M0.01%-1,83413F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA16,696$1.1M<0.01%-5,90313F-HRTimelineGroup
Walleye Capital LLCin group Walleye Capital LLC14,649$968K0.01%+58513F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP14,001$925K<0.01%new13F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC13,978$924K<0.01%+32913F-HRTimelineGroup
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding13,990$923K-2,389Timeline
MetLife Investment Management, LLCin group MetLife Investment Management…13,922$920K<0.01%-93213F-HRTimelineGroup
FRED ALGER MANAGEMENT, LLCin group FRED ALGER MANAGEMENT, LLC13,726$907K<0.01%new13F-HRTimelineGroup
Sofinnova Investments, Inc.13,553$896K0.05%+6,24113F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…12,851$849K0.01%013F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD12,373$818K<0.01%-51613F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …11,438$756K<0.01%+4,06213F-HRTimelineGroup
Legato Capital Management LLC11,287$746K0.08%+4,05913F-HRTimeline
Lion Point Capital, LP10,600$700K3.98%013F-HRTimeline
Assenagon Asset Management S.A.10,433$689K<0.01%new13F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.9,226$610K<0.01%new13F-HRTimelineGroup
STATE BOARD OF ADMINISTRATION OF FLORID…9,129$603K<0.01%013F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC9,028$597K0.01%new13F-HRTimeline
Cubist Systematic Strategies, LLC8,714$576K0.01%new13F-HRTimeline
PROFUND ADVISORS LLC8,118$536K0.02%+1,40413F-HRTimeline
SG Americas Securities, LLC8,064$533K<0.01%new13F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC8,006$529K<0.01%-4,21613F-HRTimeline
China Universal Asset Management Co., L…7,094$469K0.04%+13813F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC6,800$449K<0.01%-89,62013F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM6,654$440K<0.01%+12013F-HRTimeline
Police & Firemen's Retirement System of…6,501$430K<0.01%+1,01113F-HRTimeline
Verition Fund Management LLC6,133$405K<0.01%new13F-HRTimeline
DNB Asset Management ASin group DNB Asset Management AS5,522$365K<0.01%+93913F-HRTimelineGroup
TEACHER RETIREMENT SYSTEM OF TEXAS5,487$363K<0.01%-53013F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC5,377$355K<0.01%new13F-HRTimelineGroup
Campbell & CO Investment Adviser LLC5,290$350K0.03%new13F-HRTimeline
ProShare Advisors LLC5,188$343K<0.01%-1,15713F-HRTimeline
Atle Fund Management AB45,690$321K1.19%+21,03813F-HRTimeline
KLP KAPITALFORVALTNING AS4,600$304K<0.01%013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC4,266$282K<0.01%-2,42913F-HRTimelineGroup
Fiduciary Trust Coin group Fiduciary Trust Co4,051$268K<0.01%013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC4,045$267K<0.01%-12,06413F-HRTimelineGroup
Bryce Point Capital, LLC3,912$259K0.32%new13F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…3,563$235K<0.01%new13F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…2,988$197K<0.01%-5913F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…2,438$161K<0.01%+2,42213F-HRTimelineGroup
STRS OHIO2,200$145K<0.01%013F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…2,158$143K0.04%+37413F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…1,931$128K<0.01%-58413F-HRTimelineGroup
Avanza Fonder AB1,668$110K<0.01%+58513F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\1,176$77.7K<0.01%-313F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,105$73K<0.01%-2,87013F-HRTimelineGroup
CWM, LLCin group CWM, LLC1,027$68K<0.01%-1713F-HRTimelineGroup
SIMPLEX TRADING, LLC800$52K<0.01%+60113F-HRTimeline
AMALGAMATED BANK787$52K<0.01%013F-HRTimeline
GF FUND MANAGEMENT CO. LTD.748$49.4K<0.01%-1413F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…730$48K<0.01%013F-HRTimeline
Aster Capital Management (DIFC) Ltd576$38.1K0.02%new13F-HRTimeline
Steward Partners Investment Advisory, L…533$35.2K<0.01%013F-HRTimeline
AlphaQuest LLC327$21.6K<0.01%013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC293$19.4K<0.01%+913F-HRTimeline
GAMMA Investing LLC276$18.2K<0.01%+3613F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.270$17.8K<0.01%013F-HRTimelineGroup
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …213$14K<0.01%+1113F-HRTimelineGroup
Arax Advisory Partners206$13.6K<0.01%new13F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.194$12.8K<0.01%new13F-HRTimelineGroup
Larson Financial Group LLC108$7.14K<0.01%-113F-HRTimeline
Daiwa Securities Group Inc.in group Daiwa Securities Group Inc.113$7K<0.01%013F-HRTimelineGroup
Clearstead Advisors, LLC102$6.74K<0.01%-4613F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…75$4.96K<0.01%+313F-HRTimelineGroup
Caitong International Asset Management …60$3.96K<0.01%+5713F-HRTimeline
Sterling Capital Management LLC56$3.7K<0.01%-413F-HRTimeline
COMERICA BANK44$2.87K<0.01%+1913F-HRTimeline
ROTHSCHILD INVESTMENT LLC40$2.64K<0.01%-513F-HRTimeline
Parkside Financial Bank & Trust20$1.32K<0.01%013F-HRTimeline
Versant Capital Management, Inc19$1.26K<0.01%013F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC12$793<0.01%013F-HRTimelineGroup
Bare Financial Services, Inc9$595<0.01%new13F-HRTimeline
Farther Finance Advisors, LLC7$463<0.01%new13F-HRTimeline
Allworth Financial LP6$397<0.01%+213F-HRTimeline
J.Safra Asset Management Corp6$396<0.01%013F-HRTimeline
Global Retirement Partners, LLC6$396<0.01%+313F-HRTimeline
SBI Securities Co., Ltd.6$396<0.01%013F-HRTimeline
Essential Partners LLC4$264<0.01%013F-HRTimeline
IFP Advisors, Inc3$198<0.01%+313F-HR/ATimeline
True Wealth Design, LLC1$67<0.01%013F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC2$00%-1013F-HRTimelineGroupValue filed as zero, left out of ratios.
Covestor Ltd2$00%013F-HRTimelineValue filed as zero, left out of ratios.