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Disclosery

IRON DISC MEDICINE INC

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Stock (common), issuer CIK 1816736

151 managers (153 13F filers) reported a position in IRON shares at 2025-06-30, 34,069,423 shares in all. 24 filers opened a position and 31 filers sold out during the quarter.

Managers
151
13F filers
153
New
24
Added
69
Reduced
37
Sold out
31
Shares held by filers
34,069,423

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, Q2 2025

Filers in the available 13F reports with a share position at 2025-06-30, 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 LLC3,245,710$172M0.01%+21,32913F-HRTimelineGroup
Atlas Venture Life Science Advisors, LLC2,384,456$126M19.07%013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.2,044,827$108M<0.01%-49,73313F-HRTimelineGroup
Frazier Life Sciences Management, L.P.1,654,834$87.6M3.5%-100,00013F-HRTimeline
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.1,577,106$83.5M1.41%013F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson1,553,961$82.3M0.04%+130,70213F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/1,515,625$80.3M0.01%+157,37113F-HRTimeline
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…1,432,090$75.8M0.01%-911,40913F-HRTimelineGroup
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC1,415,020$74.9M1.88%013F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC1,396,736$74M<0.01%+91,69013F-HRTimelineGroup
Paradigm Biocapital Advisors LPin group Paradigm Biocapital Advisors …1,210,971$64.1M2.74%013F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.1,099,401$58.2M3.01%+27,53613F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP929,768$49.2M<0.01%+11,20113F-HRTimelineGroup
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…919,403$48.7M0.88%+137,07013F-HRTimelineGroup
Woodline Partners LP866,955$45.9M0.24%+364,72513F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO843,616$44.7M<0.01%+84,27813F-HRTimelineGroup
Logos Global Management LP700,000$37.1M4.95%+305,65813F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC598,589$31.7M<0.01%+26,60513F-HRTimelineGroup
Bain Capital Life Sciences Investors, L…in group Bain Capital Life Sciences In…583,500$30.9M3.87%-400,00013F-HRTimelineGroup
TCG Crossover Management, LLC465,257$24.6M2.81%013F-HRTimeline
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…450,000$23.8M0.04%+150,00013F-HRTimelineGroup
ARMISTICE CAPITAL, LLC436,000$23.1M0.88%013F-HRTimeline
Saturn V Capital Management LP396,115$21M8.5%-122,06213F-HRTimeline
BAKER BROS. ADVISORS LPin group BAKER BROS. ADVISORS LP337,050$17.9M0.17%+260,00013F-HRTimelineGroup
EVENTIDE ASSET MANAGEMENT, LLC308,030$16.3M0.29%+126,21213F-HRTimeline
First Turn Management, LLC299,464$15.9M2.96%new13F-HRTimeline
Foresite Capital Management V, LLCin group Foresite Capital Management V…299,069$15.8M19.62%013F-HRTimelineGroup
Nantahala Capital Management, LLCin group Nantahala Capital Management,…287,800$15.2M1.08%+139,40913F-HRTimelineGroup
Sio Capital Management, LLC284,787$15.1M6.05%+211,27613F-HRTimeline
UBS Group AGgroup of 2 filers holding267,133$14.1M+97,948Timeline
Checkpoint Capital L.P.265,000$14M6.54%+21,68913F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC225,856$12M<0.01%+95,10513F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP219,095$11.6M<0.01%+10,28213F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co204,241$10.8M<0.01%+9,51613F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC197,824$10.5M0.01%+4,16013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP192,856$10.2M<0.01%+53,46313F-HRTimelineGroup
Opaleye Management Inc.186,418$9.87M2%+101,41813F-HR/ATimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/168,822$8.94M<0.01%+115,01413F-HRTimelineGroup
Palo Alto Investors LP145,691$7.72M1.64%new13F-HRTimeline
Ensign Peak Advisors, Inc141,545$7.5M0.01%+69,03213F-HRTimeline
Vestal Point Capital, LP140,000$7.41M0.39%new13F-HRTimeline
Blue Owl Capital Holdings LP122,260$6.47M2.09%-18,00013F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC121,520$6.44M<0.01%+53,61513F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY110,679$5.86M<0.01%-59,53113F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC96,420$5.11M0.01%-94,80013F-HRTimeline
Zimmer Partners, LP90,163$4.78M0.11%+47,26313F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC86,558$4.58M<0.01%+40,85013F-HR/ATimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC86,487$4.58M<0.01%+3,21113F-HRTimelineGroup
SCHRODER INVESTMENT MANAGEMENT GROUP82,451$4.49M<0.01%-4,83913F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…75,997$4.02M0.01%+5,05613F-HRTimelineGroup
Patient Square Capital LP74,000$3.92M1.41%-9,00013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp71,502$3.79M<0.01%+7,99913F-HRTimelineGroup
Exome Asset Management LLC61,356$3.25M2.68%-30013F-HR/ATimeline
ExodusPoint Capital Management, LP57,945$3.07M0.04%+44,38013F-HRTimeline
Nicholas Investment Partners, LP54,445$2.88M0.26%new13F-HRTimeline
TD Asset Management Inc53,048$2.81M<0.01%+10,60013F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …51,836$2.75M<0.01%+11,25113F-HRTimelineGroup
Nuveen, LLCin group TIAA50,270$2.66M<0.01%-62,44713F-HRTimelineGroup
Swiss National Bank42,900$2.27M<0.01%+7,00013F-HRTimeline
RHUMBLINE ADVISERS35,755$1.89M<0.01%+3,61113F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc32,061$1.7M<0.01%new13F-HRTimelineGroup
Rafferty Asset Management, LLC31,489$1.67M0.01%-2,55213F-HRTimeline
PFM Health Sciences, LP30,799$1.63M0.14%new13F-HRTimeline
Catalio Capital Management, LP30,661$1.62M0.34%new13F-HRTimeline
Bollard Group LLC30,635$1.62M0.04%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…25,140$1.33M<0.01%+1,44013F-HRTimelineGroup
Atle Fund Management AB24,652$1.31M0.56%new13F-HRTimeline
ALLIANCEBERNSTEIN L.P.24,140$1.28M<0.01%+3,08013F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc24,097$1.28M<0.01%+3,68213F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA22,599$1.2M<0.01%+21,40113F-HR/ATimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN22,461$1.19M<0.01%-37513F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC21,593$1.14M<0.01%-86,90613F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…20,250$1.07M<0.01%+9813F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC19,726$1.04M<0.01%new13F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC18,626$986K0.01%-6,85313F-HRTimelineGroup
PRELUDE CAPITAL MANAGEMENT, LLC18,156$962K0.09%-4413F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND16,852$892K<0.01%+10,57613F-HR/ATimeline
Invesco Ltd.in group Invesco Ltd.16,817$891K<0.01%+2,98313F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\16,717$885K<0.01%+2,01213F-HRTimelineGroup
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding16,379$870K+84Timeline
CITIGROUP INCin group CITIGROUP INC16,109$853K<0.01%-26,86613F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…14,854$787K<0.01%+1,40013F-HRTimelineGroup
Harvest Investment Services, LLC14,316$758K0.17%-1,06613F-HRTimeline
Walleye Capital LLCin group Walleye Capital LLC14,064$745K0.01%-8,01113F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC13,649$723K<0.01%new13F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD12,889$683K<0.01%+90613F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…12,851$681K0.01%-1,77713F-HRTimeline
OCONNOR, A Distinct Business Unit of UB…12,317$652K0.02%-1,30413F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
INTECH INVESTMENT MANAGEMENT LLC12,222$647K0.01%+1,27413F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/10,988$582K<0.01%+5,13713F-HRTimelineGroup
Lion Point Capital, LP10,600$561K3.81%013F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP10,246$543K<0.01%new13F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd9,382$497K0.01%new13F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…9,129$483K<0.01%+5,07913F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …7,376$391K<0.01%+98513F-HRTimelineGroup
Sofinnova Investments, Inc.7,312$387K0.03%-17313F-HRTimeline
Legato Capital Management LLC7,228$383K0.05%new13F-HRTimeline
China Universal Asset Management Co., L…6,956$368K0.03%+2213F-HRTimeline
HighVista Strategies LLC6,733$357K0.13%+27513F-HRTimeline
PROFUND ADVISORS LLC6,714$356K0.01%-44613F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC6,695$355K<0.01%+74413F-HRTimelineGroup
ARIZONA STATE RETIREMENT SYSTEM6,534$346K<0.01%+1,21913F-HRTimeline
ProShare Advisors LLC6,345$336K<0.01%-15513F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS6,017$319K<0.01%+1,05213F-HRTimeline
Police & Firemen's Retirement System of…5,490$291K<0.01%+60013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS4,703$249K<0.01%-5,58313F-HRTimelineGroup
KLP KAPITALFORVALTNING AS4,600$244K<0.01%+90013F-HRTimeline
DNB Asset Management ASin group DNB Asset Management AS4,583$243K<0.01%new13F-HRTimelineGroup
Fiduciary Trust Coin group Fiduciary Trust Co4,051$215K<0.01%013F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…3,975$211K0.01%+3,15213F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…3,047$161K<0.01%-2913F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,515$133K<0.01%+20613F-HRTimelineGroup
MEEDER ASSET MANAGEMENT INCin group Meeder Advisory Services, Inc.2,244$119K0.01%new13F-HRTimelineGroup
STRS OHIO2,200$117K<0.01%-4,80013F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…1,784$94.5K0.03%-77213F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\1,179$62.4K<0.01%-2413F-HRTimelineGroup
Avanza Fonder AB1,083$57.4K<0.01%new13F-HRTimeline
CWM, LLCin group CWM, LLC1,044$55K<0.01%+71113F-HRTimelineGroup
AMALGAMATED BANK787$42K<0.01%013F-HRTimeline
GF FUND MANAGEMENT CO. LTD.762$40.4K<0.01%013F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…730$39K<0.01%013F-HRTimeline
Steward Partners Investment Advisory, L…533$28.2K<0.01%+813F-HRTimeline
AlphaQuest LLC327$17.3K<0.01%013F-HRTimeline
iA Global Asset Management Inc.322$17K<0.01%new13F-HRTimeline
NISA INVESTMENT ADVISORS, LLC284$15K<0.01%+20313F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.270$14.3K<0.01%new13F-HR/ATimelineGroup
GAMMA Investing LLC240$12.7K<0.01%-1013F-HRTimeline
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …202$11K<0.01%new13F-HRTimelineGroup
SIMPLEX TRADING, LLC199$10K<0.01%-1,64113F-HRTimeline
Clearstead Advisors, LLC148$7.84K<0.01%+10213F-HRTimeline
Daiwa Securities Group Inc.in group Daiwa Securities Group Inc.113$6K<0.01%013F-HRTimelineGroup
Larson Financial Group LLC109$5.77K<0.01%new13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…72$3.81K<0.01%+6213F-HRTimelineGroup
Sterling Capital Management LLC60$3.18K<0.01%-29213F-HR/ATimeline
ROTHSCHILD INVESTMENT LLC45$2.38K<0.01%013F-HRTimeline
COMERICA BANK25$1.33K<0.01%+813F-HRTimeline
IFP Advisors, Inc0$1.17K<0.01%-113F-HRTimelineAmount filed as zero, left out of ratios.
Parkside Financial Bank & Trust20$1.06K<0.01%new13F-HRTimeline
Versant Capital Management, Inc19$1.01K<0.01%new13F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC12$1K<0.01%013F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…16$847<0.01%+613F-HRTimelineGroup
ASSETMARK, INCin group ASSETMARK, INC12$636<0.01%013F-HRTimelineGroup
J.Safra Asset Management Corp6$318<0.01%013F-HR/ATimeline
SBI Securities Co., Ltd.6$318<0.01%013F-HRTimeline
Allworth Financial LP4$212<0.01%new13F-HRTimeline
Essential Partners LLC4$212<0.01%13F-HRTimeline
Global Retirement Partners, LLC3$159<0.01%13F-HRTimeline
Caitong International Asset Management …3$159<0.01%-94413F-HRTimeline
True Wealth Design, LLC1$53<0.01%-613F-HRTimeline
Covestor Ltd2$00%013F-HRTimelineValue filed as zero, left out of ratios.
CONCOURSE FINANCIAL GROUP SECURITIES, I…0$0013F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.