- MRCC — Monroe Capital Corporation
- MRCCL — Monroe Capital Corporation - 5.
- MRCOU — Mercator Acquisition Corp.
- MRCY — Mercury Systems, Inc.
- MRD.TO — Melcor Developments Ltd.
- MRDB — MariaDB plc
- MRDN — Meridian Holdings Inc.
- MRE.TO — Martinrea International Inc.
- MREL.TO — Middlefield Real Estate Dividend ETF
- MREO — Mereo BioPharma Group plc
- MRESX — Cromwell CenterSquare Real Estate Fund - Investor Class
- MRFOX — Marshfield Concentrated Opportunity
- MRG-UN.TO — Morguard North American Residential Real Estate Investment Trust
- MRGAX — MFS Series Trust I: MFS Core Equity Fund - Class A
- MRGIX — BMO Strategic Income Fund - Y
- MRIGX — Meridian Growth Fund
- MRIN — Marin Software Incorporated
- MRK — Merck & Co., Inc.
- MRKR — Marker Therapeutics, Inc.
- MRLN — Marlin Business Services Corp.
- MRLTX — AMG Renaissance Large Cap Growth Fund - Class N
- MRM — MEDIROM Healthcare Technologies Inc.
- MRNA — Moderna, Inc.
- MRND — IQ U.S. Mid Cap R&D Leaders ETF
- MRNO — Murano Global Investments PLC Ordinary Shares
- MRNOW — Murano Global Investments PLC Warrants
- MRNS — Marinus Pharmaceuticals, Inc.
- MRNX — Daily Target 2X Long MRNA ETF
- MRNY — YieldMax MRNA Option Income Strategy ETF
- MRO — Marathon Oil Corporation
- MRO.V — Millrock Resources Inc.
- MRP — Millrose Properties, Inc.
- MRRL — UBS ETRACS Monthly Pay 2xLeveraged Mortgage REIT ETN Series B
- MRS.V — Mission Ready Solutions Inc.
- MRSAX — MFS Series Trust I MFS Research International Fund Class A
- MRSH — Marsh & McLennan Companies, Inc.
- MRSK — Toews Agility Shares Managed Risk ETF
- MRSKX — MFS Research International R6
- MRSN — Mersana Therapeutics, Inc.
- MRSRX — MFS Research International Fund
- MRT — Marti Technologies, Inc.
- MRT-UN.TO — Morguard Real Estate Investment Trust
- MRTN — Marten Transport, Ltd.
- MRTX — Mirati Therapeutics, Inc.
- MRU.TO — Metro Inc.
- MRUS — Merus N.V.
- MRV.TO — Nuvo Pharmaceuticals Inc.
- MRVC — MRV Communications, Inc.
- MRVI — Maravai LifeSciences Holdings, Inc.
- MRVL — Marvell Technology, Inc.
- MRVL.V — Marvel Biosciences Corp.
- MRVU — Direxion Daily MRVL Bull 2X ETF
- MRX — Marex Group plc Ordinary Shares
- MRZ.V — Mirasol Resources Ltd.
- MS — Morgan Stanley
- MS-PL — Morgan Stanley
- MS-PO — Morgan Stanley
- MS-PP — Morgan Stanley
- MS-PQ — Morgan Stanley
- MSA — MSA Safety Incorporated
- MSA.TO — Mineros S.A.
- MSAC — Medicus Sciences Acquisition Corp.
- MSACW — Medicus Sciences Acquisition Corp.
- MSACX — Morgan Stanley Instl Fund, Inc Active Intl Alloc. Pt. Class I
- MSAI — MultiSensor AI Holdings, Inc.
- MSAIW — MultiSensor AI Holdings, Inc.
- MSAQX — Morgan Stanley Institutional Fund - Asia Opportunity Portfolio Class I
- MSB — Mesabi Trust
- MSBI — Midland States Bancorp, Inc.
- MSBIP — Midland States Bancorp, Inc.
- MSBT — Morgan Stanley Bitcoin Trust ETF
- MSC — Studio City International Holdings Limited
- MSCC — Microsemi Corp.
- MSCFX — Mairs & Power Small Cap Fund
- MSCI — MSCI Inc.
- MSCL.TO — Satellos Bioscience Inc.
- MSCL.V — Satellos Bioscience Inc.
- MSD — Morgan Stanley Emerging Markets Debt Fund, Inc.
- MSDA — MSD Acquisition Corp.
- MSDAU — MSD Acquisition Corp.
- MSDAW — MSD Acquisition Corp.
- MSDD — GraniteShares 2x Short MSTR Daily ETF
- MSDL — Morgan Stanley Direct Lending Fund
- MSEGX — MSIF Growth Portfolio Class A
- MSEIX — AMG Veritas Asia Pacific Fund Class I
- MSEQX — Morgan Stanley Institutional Fund, Inc Capital Growth Ptf, Cl I
- MSEX — Middlesex Water Company
- MSFAX — Morgan Stanley Inst Global Franchise I
- MSFBX — MSIF Global Franchise Class A
- MSFD — Direxion Daily MSFT Bear 1X Shares
- MSFG — MainSource Financial Group, Inc.
- MSFH.TO — Harvest Microsoft High Income Shares ETF
- MSFL — GraniteShares 2x Long MSFT Daily ETF
- MSFLX — Morgan Stanley Institutional Fund, Inc. Global Franchise Portfolio Class L
- MSFO — YieldMax MSFT Option Income Strategy ETF
- MSFT — Microsoft Corporation
- MSFU — Direxion Daily MSFT Bull 2X Shares
- MSGAX — Meridian Small Cap Growth Fund A Class
- MSGCX — Meridian Small Cap Growth Fund
- MSGE — Madison Square Garden Entertainment Corp.
