Skip to content
Disclosery

IRON DISC MEDICINE INC

Follow

Stock (common), issuer CIK 1816736

195 managers (198 13F filers) reported a position in IRON shares at 2025-12-31, 38,292,544 shares in all. 36 filers opened a position and 11 filers sold out during the quarter.

Managers
195
13F filers
198
New
36
Added
86
Reduced
48
Sold out
11
Shares held by filers
38,292,544

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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 LLC5,450,222$433M0.02%+515,06313F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.2,274,980$181M<0.01%+255,69713F-HRTimelineGroup
RA CAPITAL MANAGEMENT, L.P.in group RA CAPITAL MANAGEMENT, L.P.1,976,132$157M1.61%+399,02613F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC1,767,680$140M<0.01%+319,62113F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/1,698,005$135M0.01%+371,57613F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,581,127$126M0.01%+828,24813F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…1,518,274$121M0.02%+108,19713F-HRTimelineGroup
Atlas Venture Life Science Advisors, LLC1,513,875$120M13.9%-628,74213F-HRTimeline
Frazier Life Sciences Management, L.P.1,260,000$100M2.69%-178,53413F-HRTimeline
STATE STREET CORPin group STATE STREET CORP1,187,991$94.3M<0.01%+142,39413F-HRTimelineGroup
ORBIMED ADVISORS LLCin group ORBIMED ADVISORS LLC1,067,550$84.8M1.73%-347,47013F-HRTimelineGroup
Siren, L.L.C.in group Siren, L.L.C.988,401$78.5M2.34%+75,00013F-HRTimelineGroup
Woodline Partners LP957,833$76.1M0.29%+90,87813F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC754,195$59.9M0.01%+225,11413F-HR/ATimelineGroup
Vestal Point Capital, LP735,000$58.4M2.14%+235,00013F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC684,958$54.4M<0.01%+56,80713F-HRTimelineGroup
BVF INC/ILin group BVF INC/IL650,000$51.6M1.74%new13F-HRTimelineGroup
JENNISON ASSOCIATES LLC532,079$42.3M0.03%new13F-HRTimeline
First Light Asset Management, LLC523,167$41.5M3.18%+291,98113F-HRTimeline
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…511,163$40.6M0.52%-408,24013F-HRTimelineGroup
Logos Global Management LP510,000$40.5M2.7%+60,00013F-HRTimeline
ARMISTICE CAPITAL, LLC499,391$39.7M0.97%+63,39113F-HRTimeline
Checkpoint Capital L.P.452,992$36M11.4%+22,99213F-HRTimeline
PERCEPTIVE ADVISORS LLCin group PERCEPTIVE ADVISORS LLC450,743$35.8M0.66%new13F-HRTimelineGroup
EVENTIDE ASSET MANAGEMENT, LLC395,392$31.4M0.49%+87,34913F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…394,374$31.3M0.03%+390,81113F-HRTimelineGroup
Assenagon Asset Management S.A.357,836$28.4M0.04%+347,40313F-HRTimeline
BAKER BROS. ADVISORS LPin group BAKER BROS. ADVISORS LP337,050$26.8M0.16%013F-HRTimelineGroup
Palo Alto Investors LP317,456$25.2M3.51%+93,15613F-HRTimeline
Foresite Capital Management V, LLCin group Foresite Capital Management V…299,069$23.7M14.45%013F-HRTimelineGroup
Saturn V Capital Management LP298,429$23.7M4.35%-42,46813F-HRTimeline
LOOMIS SAYLES & CO L Pin group LOOMIS SAYLES & CO L P282,409$22.4M0.03%new13F-HRTimelineGroup
GREAT POINT PARTNERS LLC250,000$19.9M6.44%new13F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co247,039$19.6M<0.01%+20,38413F-HRTimelineGroup
Aberdeen Group plcin group Aberdeen Group plc234,358$18.6M0.03%+202,29713F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding230,463$18.3M-32,540Timeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP228,070$18.1M<0.01%+8,58113F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP223,575$17.7M<0.01%-6,84813F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management221,761$17.6M0.03%-116,34013F-HRTimelineGroup
Opaleye Management Inc.200,000$15.9M2.1%+6,22713F-HR/ATimeline
TimesSquare Capital Management, LLC187,777$14.9M0.22%+5,60713F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC184,779$14.7M0.01%+23,77913F-HRTimelineGroup
Ensign Peak Advisors, Inc177,050$14.1M0.02%013F-HR/ATimeline
First Turn Management, LLC153,206$12.2M1.39%-244,48713F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/135,986$10.8M<0.01%-25,19813F-HRTimelineGroup
Nantahala Capital Management, LLCin group Nantahala Capital Management,…132,800$10.5M0.63%-155,00013F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS122,153$9.7M0.01%+84,54313F-HRTimelineGroup
Sofinnova Investments, Inc.111,010$8.82M0.38%+97,45713F-HRTimeline
Catalio Capital Management, LP110,427$8.77M1.55%-106,10013F-HR/ATimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC100,395$7.97M0.01%+50,00113F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC99,612$7.91M<0.01%-7,59113F-HRTimelineGroup
DNB Asset Management ASin group DNB Asset Management AS84,255$6.69M0.02%+78,73313F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC82,984$6.59M<0.01%+8,63413F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC80,274$6.18M<0.01%-61,20513F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC76,338$6.06M<0.01%-73,52613F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY74,826$5.94M<0.01%+18,75113F-HR/ATimelineGroup
Patient Square Capital LP74,000$5.88M1.26%013F-HRTimeline
TD Asset Management Inc69,634$5.53M<0.01%+10,38613F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp67,707$5.38M<0.01%+2,90713F-HRTimelineGroup
iA Global Asset Management Inc.66,430$5.28M0.07%+91813F-HRTimeline
TUDOR INVESTMENT CORP ET AL66,125$5.25M0.03%new13F-HRTimeline
Verition Fund Management LLC63,535$5.05M0.03%+57,40213F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC62,820$4.99M0.01%+56,02013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.61,070$4.85M<0.01%+39,62713F-HRTimelineGroup
KVP Capital Advisors, LP58,250$4.63M4.78%13F-HRTimeline
ExodusPoint Capital Management, LP58,211$4.62M0.05%new13F-HRTimeline
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC58,053$4.61M0.01%new13F-HRTimelineGroup
Sio Capital Management, LLC57,586$4.57M0.76%-227,20113F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …52,510$4.07M<0.01%+4,93313F-HRTimelineGroup
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.50,000$3.97M0.01%new13F-HRTimelineGroup
Burkehill Global Management, LP50,000$3.97M0.26%new13F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…49,713$3.89M0.07%new13F-HRTimelineGroup
SCHRODER INVESTMENT MANAGEMENT GROUP50,103$3.85M<0.01%-17,09313F-HRTimeline
Nuveen, LLCin group TIAA48,471$3.85M<0.01%+77713F-HRTimelineGroup
Nicholas Investment Partners, LP48,082$3.82M0.28%-39,92113F-HRTimeline
Swiss National Bank48,000$3.81M<0.01%+4,40013F-HRTimeline
Atle Fund Management AB47,967$3.81M1.22%+2,27713F-HRTimeline
Exome Asset Management LLC46,743$3.71M1.83%-14,61313F-HRTimeline
NEXTBio Capital Management LP42,778$3.4M1.99%13F-HRTimeline
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …40,203$3.19M<0.01%+39,99013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC36,176$2.87M<0.01%+32,13113F-HRTimelineGroup
Rafferty Asset Management, LLC36,093$2.87M0.01%-1,20913F-HRTimeline
SEVEN GRAND MANAGERS, LLC35,000$2.78M0.21%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN33,265$2.64M<0.01%+6,21013F-HRTimelineGroup
ALPS ADVISORS INCin group ALPS ADVISORS INC31,002$2.46M0.01%+14,21013F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC30,328$2.41M<0.01%+2,39013F-HRTimelineGroup
RTW INVESTMENTS, LP30,000$2.38M0.02%new13F-HRTimeline
RHUMBLINE ADVISERS29,833$2.37M<0.01%-4,65713F-HRTimeline
Zimmer Partners, LP27,500$2.18M0.06%-62,66313F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …27,301$2.17M<0.01%+15,86313F-HRTimelineGroup
Eagle Health Investments LP27,100$2.15M0.47%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…25,200$2M<0.01%+5413F-HRTimelineGroup
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/24,826$1.97M<0.01%+7,04113F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.24,540$1.95M<0.01%013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…23,683$1.88M<0.01%+21,24513F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc23,653$1.88M<0.01%-1,49413F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…23,256$1.85M<0.01%+1,16313F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd23,094$1.83M0.05%new13F-HRTimelineGroup
SG Americas Securities, LLC21,122$1.68M<0.01%+13,05813F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\20,523$1.63M<0.01%+1,63713F-HRTimelineGroup
Campbell & CO Investment Adviser LLC17,399$1.38M0.07%+12,10913F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD17,106$1.36M<0.01%+4,73313F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…16,156$1.28M0.01%+3,30513F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC15,754$1.25M<0.01%+10,37713F-HRTimelineGroup
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding15,545$1.23M+1,555Timeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC14,007$1.11M<0.01%+2913F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND13,985$1.11M<0.01%-7,50513F-HRTimeline
PRELUDE CAPITAL MANAGEMENT, LLC13,985$1.11M0.08%-4,17113F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…13,832$1.1M0.01%-9013F-HRTimelineGroup
PROFUND ADVISORS LLC13,478$1.07M0.03%+5,36013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC13,186$1.05M<0.01%+8,92013F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding13,042$1.04M-23,308Timeline
FRED ALGER MANAGEMENT, LLCin group FRED ALGER MANAGEMENT, LLC12,267$974K<0.01%-1,45913F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson11,555$918K<0.01%-350,14913F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd11,359$902K0.02%-31,92813F-HRTimeline
PFM Health Sciences, LP11,002$874K0.09%-21,53713F-HRTimeline
Ghisallo Capital Management LLC10,000$794K0.04%new13F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC9,910$787K0.01%+1,90413F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC9,324$740K0.02%+29613F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…8,704$691K<0.01%-42513F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…8,306$660K<0.01%new13F-HRTimelineGroup
Legato Capital Management LLC8,248$655K0.06%-3,03913F-HRTimeline
Lion Point Capital, LP8,100$643K3.33%-2,50013F-HRTimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …7,767$617K<0.01%new13F-HRTimelineGroup
China Universal Asset Management Co., L…7,751$616K0.05%+65713F-HRTimeline
Jain Global LLC7,319$581K0.01%new13F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC6,494$557K<0.01%new13F-HRTimeline
FORA Capital, LLC6,735$544K0.07%new13F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM6,798$540K<0.01%+14413F-HRTimeline
Police & Firemen's Retirement System of…6,716$533K<0.01%+21513F-HRTimeline
ProShare Advisors LLC6,227$494K<0.01%+1,03913F-HRTimeline
STRS OHIO6,000$476K<0.01%+3,80013F-HRTimeline
Engineers Gate Manager LP5,460$434K0.01%new13F-HRTimeline
VARCOV Co.5,327$423K0.17%13F-HRTimeline
KLP KAPITALFORVALTNING AS5,200$413K<0.01%+60013F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP4,642$369K<0.01%-9,35913F-HRTimelineGroup
Abel Hall, LLC4,443$353K0.08%new13F-HRTimeline
Entropy Technologies, LP4,357$346K0.02%new13F-HRTimeline
Fiduciary Trust Coin group Fiduciary Trust Co4,051$322K<0.01%013F-HRTimelineGroup
Creative Planningin group Creative Planning3,864$307K<0.01%new13F-HRTimelineGroup
AlphaCentric Advisors LLC3,756$298K0.3%13F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS3,614$287K<0.01%-1,87313F-HRTimeline
GSA CAPITAL PARTNERS LLP3,287$261K0.02%new13F-HRTimeline
Allianz Asset Management GmbHin group Allianz SE3,000$238K<0.01%new13F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…2,988$237K<0.01%013F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…2,897$230K0.06%+73913F-HRTimelineGroup
SAXON INTERESTS, INC.2,576$205K0.07%new13F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,059$164K<0.01%+12813F-HRTimelineGroup
Avanza Fonder AB1,903$151K<0.01%+23513F-HRTimeline
Persistent Asset Partners Ltd1,780$141K0.07%new13F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\1,176$93.4K<0.01%013F-HRTimelineGroup
CWM, LLCin group CWM, LLC1,033$82K<0.01%+613F-HRTimelineGroup
KBC Group NVin group KBC Group NV1,011$80K<0.01%new13F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA802$64K<0.01%-15,89413F-HRTimelineGroup
AMALGAMATED BANK784$62K<0.01%-313F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…776$61.6K<0.01%-32913F-HRTimelineGroup
GF FUND MANAGEMENT CO. LTD.742$58.9K<0.01%-613F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…730$58K<0.01%013F-HRTimeline
Steward Partners Investment Advisory, L…528$41.9K<0.01%-513F-HRTimeline
Cygnus Capital Advisors, LLC502$40K0.03%13F-HRTimeline
ANTIPODES PARTNERS Ltd419$33.3K<0.01%new13F-HRTimeline
AlphaQuest LLC366$29.1K<0.01%+3913F-HRTimeline
GAMMA Investing LLC304$24.1K<0.01%+2813F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.273$21.7K<0.01%+313F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC240$19.1K<0.01%-5313F-HRTimeline
Caitong International Asset Management …232$18.4K<0.01%+17213F-HR/ATimeline
Sterling Capital Management LLC163$12.9K<0.01%+10713F-HRTimeline
Daiwa Securities Group Inc.in group Daiwa Securities Group Inc.113$9K<0.01%013F-HRTimelineGroup
Larson Financial Group LLC112$8.89K<0.01%+413F-HRTimeline
Smartleaf Asset Management LLC73$5.61K<0.01%new13F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.70$5.56K<0.01%-12413F-HRTimelineGroup
Kemnay Advisory Services Inc.69$5.48K<0.01%new13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…67$5.32K<0.01%-813F-HRTimelineGroup
J.Safra Asset Management Corp63$5K<0.01%+5713F-HRTimeline
Farther Finance Advisors, LLC53$4.21K<0.01%+4613F-HRTimeline
ROTHSCHILD INVESTMENT LLC40$3.18K<0.01%013F-HRTimeline
FIRST HORIZON CORP28$2.22K<0.01%new13F-HRTimeline
Parkside Financial Bank & Trust20$1.59K<0.01%013F-HRTimeline
COMERICA BANK19$1.54K<0.01%-2513F-HRTimeline
Versant Capital Management, Inc19$1.51K<0.01%013F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC12$953<0.01%013F-HRTimelineGroup
Cornerstone Financial Management LLC11$874<0.01%13F-HR/ATimeline
Bare Financial Services, Inc9$715<0.01%013F-HRTimeline
Allworth Financial LP7$556<0.01%+113F-HRTimeline
Essential Partners LLC4$318<0.01%013F-HRTimeline
IFP Advisors, Inc3$238<0.01%013F-HRTimeline
Global Retirement Partners, LLC3$238<0.01%-313F-HRTimeline
Arax Advisory Partners2$159<0.01%-20413F-HRTimeline
True Wealth Design, LLC1$80<0.01%013F-HRTimeline
SBI Securities Co., Ltd.1$79<0.01%-513F-HRTimeline
Hughes Financial Services, LLC1$79<0.01%new13F-HRTimeline
Basecamp Wealth Advisors LLC1$79<0.01%13F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC2$00%013F-HRTimelineGroupValue filed as zero, left out of ratios.
Covestor Ltd2$00%013F-HRTimelineValue filed as zero, left out of ratios.
NOMURA ASSET MANAGEMENT CO LTDin group NOMURA ASSET MANAGEMENT CO LTD0$00%new13F-HRTimelineGroupValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.