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Disclosery

IRON DISC MEDICINE INC

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Stock (common), issuer CIK 1816736

157 managers (159 13F filers) reported a position in IRON shares at 2025-03-31, 33,154,061 shares in all. 25 filers opened a position and 21 filers sold out during the quarter.

Managers
157
13F filers
159
New
25
Added
74
Reduced
31
Sold out
21
Shares held by filers
33,154,061

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 2025

Filers in the available 13F reports with a share position at 2025-03-31, 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 LLC3,224,381$160M0.01%+1,358,13313F-HRTimelineGroup
Atlas Venture Life Science Advisors, LLC2,384,456$118M22.69%-125,00013F-HRTimeline
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…2,343,499$116M0.02%+948,09413F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.2,094,560$104M<0.01%+234,82813F-HRTimelineGroup
Frazier Life Sciences Management, L.P.1,754,834$87.1M3.98%013F-HRTimeline
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.1,577,106$78.3M1.31%new13F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson1,423,259$74.5M0.04%+205,44413F-HRTimelineGroup
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC1,415,020$70.2M1.69%-370,55113F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/1,358,254$67.4M0.01%-36,38313F-HRTimeline
VANGUARD GROUP INCin group VANGUARD GROUP INC1,305,046$64.8M<0.01%+236,80013F-HRTimelineGroup
Paradigm Biocapital Advisors LPin group Paradigm Biocapital Advisors …1,210,971$60.1M2.77%-286,74913F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.1,071,865$53.2M3%new13F-HR/ATimelineGroup
Bain Capital Life Sciences Investors, L…in group Bain Capital Life Sciences In…983,500$48.8M7.22%013F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP918,567$45.6M<0.01%+149,83213F-HRTimelineGroup
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…782,333$38.8M0.77%+181,81813F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO759,338$37.7M<0.01%+698,32113F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC571,984$28.4M<0.01%+99,27813F-HRTimelineGroup
Saturn V Capital Management LP518,177$25.7M12.98%+8,77113F-HRTimeline
Woodline Partners LP502,230$24.9M0.16%+105,63013F-HRTimeline
TCG Crossover Management, LLC465,257$23.1M3.15%-21,70013F-HRTimeline
ARMISTICE CAPITAL, LLC436,000$21.6M0.58%+80,00013F-HRTimeline
Logos Global Management LP394,342$19.6M3.48%+194,34213F-HRTimeline
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…300,000$14.9M0.03%-50,00013F-HRTimelineGroup
Foresite Capital Management V, LLCin group Foresite Capital Management V…299,069$14.8M16.94%013F-HRTimelineGroup
Checkpoint Capital L.P.243,311$12.1M6.63%+58,31113F-HRTimeline
SILVERARC CAPITAL MANAGEMENT, LLCin group SILVERARC CAPITAL MANAGEMENT,…236,471$11.7M2.45%+126,09013F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.219,603$10.9M0.01%+138,41313F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP208,813$10.4M<0.01%+21,79613F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co194,725$9.67M<0.01%+29,65313F-HR/ATimelineGroup
VICTORY CAPITAL MANAGEMENT INC193,664$9.61M0.01%-42,58013F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC191,220$9.49M0.01%+104,80013F-HRTimeline
EVENTIDE ASSET MANAGEMENT, LLC181,818$9.03M0.18%new13F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY170,210$8.45M<0.01%+20,18613F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding169,185$8.4M+51,740Timeline
PERCEPTIVE ADVISORS LLCin group PERCEPTIVE ADVISORS LLC150,000$7.45M0.26%new13F-HR/ATimelineGroup
Nantahala Capital Management, LLCin group Nantahala Capital Management,…148,391$7.37M0.61%-1,60913F-HRTimelineGroup
Blue Owl Capital Holdings LP140,260$6.96M2.25%+20,00013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP139,393$6.92M<0.01%-32713F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC130,751$6.49M<0.01%-41,05913F-HR/ATimelineGroup
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…130,386$6.47M0.01%+90413F-HRTimelineGroup
Nuveen, LLCin group TIAA112,717$5.6M<0.01%13F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC108,499$5.39M0.01%+100,62013F-HRTimelineGroup
SCHRODER INVESTMENT MANAGEMENT GROUP87,290$4.57M<0.01%-4,20013F-HRTimeline
Opaleye Management Inc.85,000$4.22M0.94%new13F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC83,276$4.13M<0.01%-4,72613F-HRTimelineGroup
Patient Square Capital LP83,000$4.12M1.7%+26,60013F-HRTimeline
MONTANOVA CAPITAL, LLC80,000$3.97M0.16%new13F-HRTimeline
BAKER BROS. ADVISORS LPin group BAKER BROS. ADVISORS LP77,050$3.82M0.04%013F-HRTimelineGroup
Sio Capital Management, LLC73,511$3.65M1.11%013F-HRTimeline
Ensign Peak Advisors, Inc72,513$3.6M0.01%+32,51313F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…70,941$3.52M0.01%+42,13413F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC67,905$3.37M<0.01%+62,62713F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp63,503$3.15M<0.01%+6,24213F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC62,214$3.09M<0.01%-529,05713F-HRTimelineGroup
Exome Asset Management LLC61,656$3.06M2.74%-7,41613F-HR/ATimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/53,808$2.67M<0.01%+18,46313F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC45,708$2.27M<0.01%+5,64413F-HR/ATimelineGroup
TWINBEECH CAPITAL LP45,448$2.26M0.04%new13F-HRTimeline
CITIGROUP INCin group CITIGROUP INC42,975$2.13M<0.01%+34013F-HRTimelineGroup
Zimmer Partners, LP42,900$2.13M0.04%+9,80013F-HRTimeline
TD Asset Management Inc42,448$2.11M<0.01%-2,48413F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …40,585$2.01M<0.01%+2,12613F-HRTimelineGroup
Swiss National Bank35,900$1.78M<0.01%+3,70013F-HRTimeline
Rafferty Asset Management, LLC34,041$1.69M0.01%+6,29213F-HRTimeline
RHUMBLINE ADVISERS32,144$1.6M<0.01%+3,10813F-HR/ATimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC25,479$1.26M0.01%+1,41213F-HRTimelineGroup
Ghisallo Capital Management LLC25,000$1.24M0.11%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…23,700$1.18M<0.01%013F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN22,836$1.13M<0.01%+2,05813F-HRTimelineGroup
Atom Investors LP22,561$1.12M0.14%new13F-HRTimeline
Walleye Capital LLCin group Walleye Capital LLC22,075$1.1M0.01%-4,92913F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.21,060$1.05M<0.01%013F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc20,415$1.01M<0.01%+2,72713F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…20,152$1M<0.01%+4,62113F-HRTimeline
PRELUDE CAPITAL MANAGEMENT, LLC18,200$903K0.09%+4413F-HRTimeline
Engineers Gate Manager LP16,810$834K0.01%+3,95913F-HRTimeline
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding16,295$816K+2,972Timeline
ALGERT GLOBAL LLC16,337$811K0.02%013F-HR/ATimeline
Harvest Investment Services, LLC15,382$764K0.21%-23213F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\14,705$730K<0.01%-1,38813F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…14,628$726K0.01%-2,37713F-HRTimeline
SG Americas Securities, LLC14,329$711K<0.01%+6,25313F-HRTimeline
Invesco Ltd.in group Invesco Ltd.13,834$687K<0.01%+2,95313F-HRTimelineGroup
OCONNOR, A Distinct Business Unit of UB…13,621$676K0.02%-63613F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
ExodusPoint Capital Management, LP13,565$673K0.01%new13F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…13,454$668K<0.01%+1,32213F-HRTimelineGroup
Aquatic Capital Management LLC12,188$605K0.02%new13F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD11,983$595K<0.01%-23013F-HRTimeline
Corebridge Financial, Inc.in group Corebridge Financial, Inc.11,180$555K<0.01%+1,37113F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC10,948$543K0.01%+3,05813F-HRTimeline
Lion Point Capital, LP10,600$526K3.36%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS10,286$511K<0.01%+5,17213F-HRTimelineGroup
Trexquant Investment LP8,556$425K<0.01%-4,31813F-HRTimeline
Quantbot Technologies LP7,565$376K0.01%+7,56113F-HRTimeline
Schonfeld Strategic Advisors LLC7,552$375K<0.01%+2,65213F-HRTimeline
Sofinnova Investments, Inc.7,485$372K0.03%-15,26713F-HRTimeline
PROFUND ADVISORS LLC7,160$355K0.02%+1,62313F-HRTimeline
STRS OHIO7,000$347K<0.01%+6,10013F-HRTimeline
China Universal Asset Management Co., L…6,934$344K0.03%+62413F-HRTimeline
ProShare Advisors LLC6,500$323K<0.01%-46613F-HRTimeline
HighVista Strategies LLC6,458$321K0.12%013F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …6,391$317K<0.01%new13F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND6,276$312K<0.01%013F-HR/ATimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC5,951$295K<0.01%+8913F-HR/ATimelineGroup
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/5,851$290K<0.01%new13F-HRTimelineGroup
VIRGINIA RETIREMENT SYSTEMS ET Al5,800$288K<0.01%13F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM5,315$264K<0.01%+59013F-HRTimeline
CIBC WORLD MARKETS CORP5,064$251K<0.01%new13F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS4,965$246K<0.01%+10813F-HRTimeline
Police & Firemen's Retirement System of…4,890$243K<0.01%+78313F-HRTimeline
Verition Fund Management LLC4,279$212K<0.01%new13F-HRTimeline
Graham Capital Management, L.P.4,217$209K0.01%new13F-HRTimeline
Fiduciary Trust Coin group Fiduciary Trust Co4,051$201K<0.01%013F-HRTimelineGroup
STATE BOARD OF ADMINISTRATION OF FLORID…4,050$201K<0.01%013F-HRTimeline
KLP KAPITALFORVALTNING AS3,700$184K<0.01%013F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…3,076$153K<0.01%+20913F-HRTimeline
Virtus Investment Advisers, LLCgroup of 2 filers holding2,556$127K+1,450Timeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,309$115K<0.01%+31013F-HRTimelineGroup
SIMPLEX TRADING, LLC1,840$91K<0.01%new13F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\1,203$59.7K<0.01%+2713F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA1,198$59K<0.01%-1,24813F-HR/ATimelineGroup
Caitong International Asset Management …947$47K0.03%+94013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…823$40.9K<0.01%-213F-HRTimelineGroup
AMALGAMATED BANK787$39K<0.01%+21913F-HRTimeline
GF FUND MANAGEMENT CO. LTD.762$37.8K<0.01%+13713F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…730$36K<0.01%013F-HRTimeline
Aster Capital Management (DIFC) Ltd577$32.4K0.01%+52313F-HRTimeline
Steward Partners Investment Advisory, L…525$26.1K<0.01%013F-HRTimeline
Sterling Capital Management LLC352$17.5K<0.01%-21413F-HRTimeline
CWM, LLCin group CWM, LLC333$17K<0.01%+25313F-HRTimelineGroup
AlphaQuest LLC327$16.2K<0.01%-30213F-HRTimeline
GAMMA Investing LLC250$12.4K<0.01%+1113F-HR/ATimeline
Daiwa Securities Group Inc.in group Daiwa Securities Group Inc.113$6K<0.01%013F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC81$4.02K<0.01%-213F-HRTimeline
Lindbrook Capital, LLC58$2.88K<0.01%new13F-HRTimeline
Clearstead Advisors, LLC46$2.28K<0.01%013F-HRTimeline
COLDSTREAM CAPITAL MANAGEMENT INC46$2.28K<0.01%new13F-HRTimeline
ROTHSCHILD INVESTMENT LLC45$2.23K<0.01%+1513F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC12$1K<0.01%-1313F-HRTimelineGroup
Fortitude Family Office, LLC20$993<0.01%013F-HRTimeline
SIGNATUREFD, LLC18$894<0.01%new13F-HRTimeline
COMERICA BANK17$839<0.01%+213F-HRTimeline
WOLFF WIESE MAGANA LLC14$695<0.01%013F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC12$596<0.01%new13F-HRTimelineGroup
Stephens Consulting, LLC10$497<0.01%new13F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…10$496<0.01%013F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…10$496<0.01%new13F-HRTimelineGroup
CoreCap Advisors, LLC9$447<0.01%-1913F-HRTimeline
True Wealth Design, LLC7$348<0.01%+613F-HRTimeline
J.Safra Asset Management Corp6$298<0.01%new13F-HR/ATimeline
SBI Securities Co., Ltd.6$298<0.01%013F-HRTimeline
Amundiin group Amundi5$229<0.01%013F-HRTimelineGroup
Parallel Advisors, LLC4$199<0.01%+313F-HRTimeline
IFP Advisors, Inc1$50<0.01%013F-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.
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.