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Disclosery

IRON DISC MEDICINE INC

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Stock (common), issuer CIK 1816736

208 managers (217 13F filers) reported a position in IRON shares at 2026-06-30, 42,768,335 shares in all. 36 filers opened a position and 22 filers sold out during the quarter.

Managers
208
13F filers
217
New
36
Added
76
Reduced
63
Sold out
22
Shares held by filers
42,768,335

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 2026

Filers in the available 13F reports with a share position at 2026-06-30, 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 LLC4,894,473$358M0.02%-692,42113F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.2,467,899$181M<0.01%+194,06813F-HRTimelineGroup
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.2,450,221$179M1.56%013F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,875,795$140M0.01%+504,31513F-HRTimelineGroup
VANGUARD GROUP INCgroup of 6 filers holding1,909,829$140M+35,039Timeline
PRICE T ROWE ASSOCIATES INC /MD/1,875,399$137M0.01%+326,04913F-HRTimeline
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…1,741,351$127M0.02%+5,97513F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,648,836$121M<0.01%-49,40813F-HRTimelineGroup
Vestal Point Capital, LP1,550,000$113M2.65%+850,00013F-HRTimeline
Atlas Venture Life Science Advisors, LLC1,513,875$111M12.56%013F-HRTimeline
Frazier Life Sciences Management, L.P.1,354,852$99.1M2.16%013F-HRTimeline
TCG Crossover Management, LLC1,341,862$98.1M2.36%013F-HRTimeline
BVF INC/ILin group BVF INC/IL1,153,612$84.4M2.16%-118,70013F-HRTimelineGroup
Woodline Partners LP958,281$70.1M0.22%013F-HRTimeline
Siren, L.L.C.in group Siren, L.L.C.888,401$65M1.32%-100,00013F-HRTimelineGroup
Logos Global Management LP875,000$64M2.76%+315,00013F-HRTimeline
Opaleye Management Inc.855,000$62.5M5.66%+434,00013F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC789,724$57.8M<0.01%+45,50213F-HRTimelineGroup
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…657,000$48.1M0.5%013F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP569,018$41.6M0.01%+174,57113F-HRTimelineGroup
Bellevue Group AGin group Bellevue Group AG560,000$41M0.86%+100,68613F-HRTimelineGroup
Saturn V Capital Management LP524,730$38.4M5.5%+74,80413F-HRTimeline
ARMISTICE CAPITAL, LLC460,000$33.6M0.93%-76,00013F-HRTimeline
JENNISON ASSOCIATES LLC439,520$32.1M0.02%-170,86213F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc438,174$32M0.04%+62,56013F-HRTimelineGroup
Palo Alto Investors LP416,646$30.5M4.21%+14,92713F-HR/ATimeline
EVENTIDE ASSET MANAGEMENT, LLC395,651$28.9M0.39%+7913F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…385,375$28.2M0.03%-1,63013F-HRTimelineGroup
Assenagon Asset Management S.A.384,158$28.1M0.04%-162,08913F-HR/ATimeline
LOOMIS SAYLES & CO L Pin group LOOMIS SAYLES & CO L P381,864$27.9M0.04%+64,64213F-HRTimelineGroup
Foresite Capital Management VI LLCgroup of 2 filers holding375,039$27.4M+970Timeline
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC357,535$26.2M0.5%-710,01513F-HRTimelineGroup
BAKER BROS. ADVISORS LPin group BAKER BROS. ADVISORS LP349,657$25.6M0.13%013F-HRTimelineGroup
Octagon Capital Advisors LP270,000$19.7M1.81%013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP264,990$19.4M<0.01%+17,79513F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co257,382$18.8M<0.01%+6,18713F-HRTimelineGroup
Checkpoint Capital L.P.240,125$17.6M4.51%-46,53613F-HRTimeline
UBS Group AGgroup of 2 filers holding225,080$16.5M+15,569Timeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC209,308$15.3M0.01%+111,37813F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp204,727$15M<0.01%-24113F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS184,695$13.5M0.01%+56,95813F-HRTimelineGroup
Catalio Capital Management, LP159,384$11.7M2.19%+36,40613F-HRTimeline
Sofinnova Investments, Inc.146,239$10.7M0.57%+67,91913F-HRTimeline
Bain Capital Life Sciences Investors, L…in group Bain Capital Life Sciences In…141,234$10.3M0.61%013F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP136,750$10M0.01%new13F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/135,111$9.88M<0.01%-31,66413F-HRTimelineGroup
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.125,000$9.14M0.02%013F-HRTimelineGroup
Ensign Peak Advisors, Inc122,111$8.93M0.01%-69,37613F-HRTimeline
Trexquant Investment LP107,699$7.88M0.05%new13F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC106,769$7.81M0.14%-1,51713F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC106,248$7.77M0.01%+22,98913F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC97,383$7.12M<0.01%-542,45913F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY91,595$6.7M<0.01%-2,66913F-HRTimelineGroup
HRT FINANCIAL LP90,822$6.64M0.01%new13F-HRTimeline
SILVERARC CAPITAL MANAGEMENT, LLCin group SILVERARC CAPITAL MANAGEMENT,…82,800$6.06M0.67%-113,22813F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC77,980$5.7M<0.01%+33,28013F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC75,872$5.55M0.01%+44,16313F-HRTimelineGroup
DNB Asset Management ASin group DNB Asset Management AS73,127$5.35M0.01%-23,62813F-HRTimelineGroup
iA Global Asset Management Inc.66,023$4.83M0.06%-22013F-HRTimeline
Casdin Capital, LLC65,000$4.75M0.24%013F-HRTimeline
SPHERA FUNDS MANAGEMENT LTD.in group SPHERA FUNDS MANAGEMENT LTD.63,538$4.65M0.66%+10,00013F-HRTimelineGroup
Nuveen, LLCin group TIAA60,357$4.41M<0.01%+8,97713F-HRTimelineGroup
KVP Capital Advisors, LP58,250$4.26M3.13%013F-HRTimeline
MOORE CAPITAL MANAGEMENT, LP57,796$4.23M0.1%013F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd56,710$4.15M0.05%+22,29213F-HRTimelineGroup
NEXTBio Capital Management LP52,655$3.85M1.77%013F-HRTimeline
ALGERT GLOBAL LLC51,850$3.79M0.04%+29,17013F-HRTimeline
ExodusPoint Capital Management, LP51,623$3.78M0.03%new13F-HRTimeline
SCHRODER INVESTMENT MANAGEMENT GROUP50,000$3.73M<0.01%-95913F-HRTimeline
Burkehill Global Management, LP50,000$3.66M0.13%013F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…49,996$3.66M0.05%+17,59013F-HRTimelineGroup
Swiss National Bank49,800$3.64M<0.01%+1,80013F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC45,874$3.36M<0.01%+3713F-HRTimelineGroup
Atle Fund Management AB43,682$3.19M0.86%-63,57313F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd42,419$3.1M0.03%new13F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.42,057$3.08M<0.01%+11,41913F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…39,360$2.88M<0.01%+4,97813F-HR/ATimeline
ALPS ADVISORS INC38,565$2.82M0.01%+7,50713F-HRTimeline
CITIGROUP INCin group CITIGROUP INC38,317$2.8M<0.01%+30,57513F-HRTimelineGroup
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …38,262$2.8M<0.01%-1,64813F-HRTimelineGroup
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …36,634$2.68M<0.01%-1,37213F-HRTimelineGroup
RHUMBLINE ADVISERS35,844$2.62M<0.01%+2,78613F-HRTimeline
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC35,034$2.56M<0.01%-4,36613F-HRTimelineGroup
SEVEN GRAND MANAGERS, LLC35,000$2.56M0.1%013F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP34,394$2.52M<0.01%new13F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC32,549$2.38M0.02%-49,28013F-HRTimelineGroup
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/32,308$2.36M<0.01%+3,53513F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\30,643$2.24M<0.01%+6,24213F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.34,670$2.22M<0.01%+10,13013F-HRTimeline
RTW INVESTMENTS, LP30,000$2.19M0.02%013F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC29,117$2.13M<0.01%-10113F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN28,924$2.12M<0.01%+14,23413F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL28,663$2.1M0.01%-2,33913F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …27,771$2.03M<0.01%-4,72213F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd26,888$1.97M0.04%new13F-HRTimeline
Rafferty Asset Management, LLC26,566$1.94M<0.01%-27,30313F-HRTimeline
Campbell & CO Investment Adviser LLC25,568$1.87M0.1%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…22,333$1.63M<0.01%-2,95913F-HRTimelineGroup
TD Asset Management Inc21,600$1.58M<0.01%-8,87613F-HRTimeline
Engineers Gate Manager LP19,552$1.43M0.02%+10,28213F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC18,710$1.37M<0.01%-14,55713F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc18,458$1.35M<0.01%-91913F-HRTimelineGroup
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding17,822$1.31M-867Timeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…17,599$1.29M0.01%-1,39413F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…16,588$1.21M0.01%+1,52313F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP16,324$1.19M0.08%new13F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC16,011$1.17M<0.01%new13F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD15,429$1.13M<0.01%+1,14113F-HRTimeline
Man Group plcin group Man Group plc14,925$1.09M<0.01%+4,91913F-HRTimelineGroup
HighVista Strategies LLC14,219$1.04M0.24%new13F-HRTimeline
PROFUND ADVISORS LLC13,509$988K0.03%-10,46313F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…12,971$949K<0.01%+4,26713F-HRTimeline
Qube Research & Technologies Ltd12,758$933K<0.01%new13F-HRTimeline
Handelsbanken Fonder AB12,700$929K<0.01%new13F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO12,647$925K<0.01%-2,86313F-HRTimelineGroup
MARTINGALE ASSET MANAGEMENT L P12,009$878K0.02%new13F-HRTimeline
Jupiter Topco LLCin group Janus Henderson11,555$844K<0.01%13F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND10,076$737K<0.01%+1,50013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC9,868$722K<0.01%-4,28713F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding8,722$638K-6,684Timeline
Entropy Technologies, LP8,408$615K0.02%+3,62013F-HRTimeline
Police & Firemen's Retirement System of…8,345$610K<0.01%+87113F-HRTimeline
China Universal Asset Management Co., L…8,239$603K0.04%-13313F-HRTimeline
Lion Point Capital, LP8,100$592K2.83%013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…8,083$591K<0.01%+5,44913F-HRTimelineGroup
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…8,020$587K<0.01%-29713F-HRTimelineGroup
PSP Research LLC8,000$585K0.31%013F-HRTimeline
SG Americas Securities, LLC7,704$563K<0.01%-3,52213F-HRTimeline
Quantinno Capital Management LP7,297$534K<0.01%new13F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM6,844$501K<0.01%+16013F-HRTimeline
EntryPoint Capital, LLC6,371$466K0.11%013F-HRTimeline
SummitTX Capital, L.P.6,309$461K0.01%-7,51113F-HRTimeline
Creative Planningin group Creative Planning6,254$457K<0.01%+2,48513F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC6,054$443K<0.01%+18613F-HRTimeline
AXQ CAPITAL, LP6,035$441K0.05%new13F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.6,027$441K<0.01%new13F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…5,640$413K<0.01%013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC5,430$397K<0.01%+1,01013F-HRTimelineGroup
KLP KAPITALFORVALTNING AS5,200$380K<0.01%013F-HRTimeline
ProShare Advisors LLC4,959$363K<0.01%-72913F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…4,812$352K0.08%+1,84513F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP4,616$345K<0.01%+2,98913F-HRTimelineGroup
Virtu Financial LLCin group Virtu Financial LLC4,694$343K0.01%+90813F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC4,630$339K<0.01%+36513F-HRTimelineGroup
Eleva Capital SAS5,115$327K0.1%013F-HRTimeline
Fiduciary Trust Coin group Fiduciary Trust Co4,051$296K<0.01%013F-HRTimelineGroup
AlphaCentric Advisors LLC4,030$295K0.25%+5813F-HRTimeline
E Fund Management Co., Ltd.3,746$274K0.01%-3,02613F-HRTimeline
CAPSTONE INVESTMENT ADVISORS, LLCin group CAPSTONE INVESTMENT ADVISORS,…3,355$245K<0.01%-2,91013F-HRTimelineGroup
Jain Global LLC3,130$229K<0.01%new13F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC3,082$225K<0.01%-87013F-HRTimeline
DLD Asset Management, LP3,000$219K0.02%new13F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS2,895$212K<0.01%-24913F-HRTimeline
STRS OHIO2,700$197K<0.01%-3,30013F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,568$188K0.01%+32013F-HRTimelineGroup
Quantbot Technologies LP2,090$153K0.01%new13F-HRTimeline
Nykredit A/Sin group Nykredit A/S1,411$103K<0.01%13F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\1,229$89.9K<0.01%+4413F-HRTimelineGroup
KBC Group NVin group KBC Group NV1,011$74K<0.01%013F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA989$73K<0.01%+96513F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…939$68.7K<0.01%-5,07813F-HRTimelineGroup
GF FUND MANAGEMENT CO. LTD.809$59.2K<0.01%-3913F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…730$53K<0.01%013F-HRTimeline
Allworth Financial LP633$46.3K<0.01%+3413F-HRTimeline
NISA INVESTMENT ADVISORS, LLC566$41.4K<0.01%+32613F-HRTimeline
Steward Partners Investment Advisory, L…528$38.6K<0.01%013F-HRTimeline
Bayforest Capital Ltd451$33K0.03%-3,11313F-HRTimeline
Pacer Advisors, Inc.444$32K<0.01%new13F-HRTimeline
State of Wyoming346$25.3K<0.01%new13F-HRTimeline
GAMMA Investing LLC292$21.4K<0.01%+2413F-HRTimeline
Kemnay Advisory Services Inc.269$19.7K<0.01%+2313F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.268$19.6K<0.01%-713F-HRTimelineGroup
TORONTO DOMINION BANKin group TORONTO DOMINION BANK198$14.5K<0.01%new13F-HRTimelineGroup
J.Safra Asset Management Corp161$11.8K<0.01%-3313F-HRTimeline
Larson Financial Group LLC123$9K<0.01%013F-HRTimeline
Sterling Capital Management LLC99$7.24K<0.01%-7913F-HRTimeline
Smartleaf Asset Management LLC92$6.85K<0.01%013F-HRTimeline
Arax Advisory Partners86$6.29K<0.01%new13F-HRTimeline
CoreCap Advisors, LLC78$5.71K<0.01%new13F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.65$4.75K<0.01%-1713F-HRTimelineGroup
Farther Finance Advisors, LLC47$3.44K<0.01%+313F-HRTimeline
FIRST HORIZON CORP36$2.63K<0.01%+613F-HRTimeline
ROTHSCHILD INVESTMENT LLC32$2.34K<0.01%-913F-HRTimeline
Integrated Wealth Concepts LLC32$2.34K<0.01%new13F-HRTimeline
Versant Capital Management, Inc30$2.19K<0.01%+1113F-HRTimeline
Silver Grove Financial Group, Inc.26$1.9K<0.01%new13F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…25$1.84K<0.01%-413F-HRTimelineGroup
Quarry LP18$1.32K<0.01%new13F-HRTimeline
JPL Wealth Management, LLC17$1.24K<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…17$1.24K<0.01%-5413F-HRTimelineGroup
GW&K Investment Management, LLC16$1K<0.01%new13F-HRTimeline
Covestor Ltd7$1K<0.01%+513F-HRTimeline
Geneos Wealth Management Inc.13$951<0.01%013F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK12$878<0.01%new13F-HRTimelineGroup
ASSETMARK, INCin group ASSETMARK, INC12$878<0.01%013F-HRTimelineGroup
Cornerstone Financial Management LLC11$805<0.01%013F-HR/ATimeline
Bare Financial Services, Inc9$658<0.01%013F-HRTimeline
Keating Financial Advisory Services, In…6$439<0.01%+313F-HRTimeline
Essential Partners LLC5$366<0.01%+113F-HRTimeline
Global Retirement Partners, LLC4$293<0.01%13F-HRTimeline