MAACU (Montes Archimedes Acquisition Corp.)
MAAX (VanEck Vectors Muni Allocation ETF)
MAB (Eaton Vance Massachusetts Municipal Bond Fund)
MAC (The Macerich Company)
MACE (Mace Security International Inc.)
MACK (Merrimack Pharmaceuticals, Inc.)
MACQ (M I Acquisitions, Inc.)
MACQU (M I Acquisitions, Inc. Units)
MACUU (Mallard Acquisition Corp.)
MARA (Marathon Patent Group, Inc.)
MARB (First Trust Vivaldi Merger Arbitrage ETF)
MARK (Remark Holdings, Inc.)
MATH (AdvisorShares Meidell Tacticl Advtge ETF)
MATL (Direxion Daily Basic Matls Bull 3X ETF)
MATN (Mateon Therapeutics, Inc.)
MAUI (AdvisorShares Market Adaptive Unconstrained Income ETF)
MAV (Pioneer Municipal High Income Advantage Trust)
MAX (MediaAlpha, Inc.)
MBRX (Moleculin Biotech, Inc.)
MBSD (FlexShares Disciplined Duration MBS Index Fund)
MBT (Mobile TeleSystems Public Joint Stock Company)
MCA (BlackRock MuniYield California Quality Fund, Inc.)
MCAC (Mountain Crest Acquisition Corp)
MCACU (Mountain Crest Acquisition Corp)
MCB (Metropolitan Bank Holding Corp.)
MCBC (Macatawa Bank Corporation)
MCBI (Metrocorp Bancshares Inc.)
MCBK (Madison County Financial, Inc.)
MCBS (MetroCity Bankshares, Inc.)
MCC (Medley Capital Corporation)
MCD (McDonald's Corporation)
MCEF (First Trust Municipal CEF Income Opportunity ETF)
MCEP (Mid-Con Energy Partners, LP)
MCGC (MCG Capital Corporation)
MCHI (iShares MSCI China ETF)
MCHP (Microchip Technology Incorporated)
MCN (Madison Covered Call & Equity Strategy Fund)
MCO (Moody's Corporation)
MCOX (Mecox Lane Limited)
MDCO (The Medicines Company)
MDD (SPDR S&P International Mid Cap ETF)
MDGL (Madrigal Pharmaceuticals, Inc.)
MDLL (Direxion Daily Mid Cap Bull 2X ETF)
MDLY (Medley Management Inc.)
MDLZ (Mondelez International, Inc.)
MDM (Mountain Province Diamonds Inc.)
MDNA (Medicenna Therapeutics Corp.)
MDP (Meredith Corporation)
MDR (McDermott International, Inc.)
MDRR (Medalist Diversified REIT, Inc.)
MDRX (Allscripts Healthcare Solutions, Inc.)
MDY (SPDR S&P MIDCAP 400 ETF Trust)
MDYG (SPDR S&P 400 Mid Cap Growth ETF)
MDYV (SPDR S&P 400 Mid Cap Value ETF)
MEA (Metalico Inc.)
MEAR (iShares Short Maturity Municipal Bond ETF)
MEAS (Measurement Specialties Inc.)
MELT (Direxion Dly Gold Miners Bear 1X ETF)
MEMP (Memorial Production Partners LP)
MEN (BlackRock MuniEnhanced Fund, Inc.)
METR (Metro Bancorp, Inc.)
METX (Meten EdtechX Education Group Ltd.)
MEXX (Direxion Daily MSCI Mexico Bull 3X Shares)
MFC (Manulife Financial Corporation)
MFCB (MFC Bancorp Ltd.)
MFD (Macquarie/First Trust Global Infrastructure/Utilities Dividend & Income Fund)
MFDX (PIMCO RAFI Dynamic Multi-Factor International Equity ETF)
MFEM (PIMCO RAFI Dynamic Multi-Factor Emerging Markets Equity ETF)
MFG (Mizuho Financial Group, Inc.)
MFIN (Medallion Financial Corp.)
MFL (BlackRock MuniHoldings Investment Quality Fund)
MFLA (iPath Long Enhanced MSCI EAFE ETN)
MFLX (Multi-Fineline Electronix, Inc.)
MFM (MFS Municipal Income Trust)
MFMS (MFAM Small-Cap Growth ETF)
MFS (Welbilt, Inc.)
MFSA (iPath Short Enhanced MSCI EAFE Index ETN)
MFSF (MutualFirst Financial, Inc.)
MFT (BlackRock MuniYield Investment Quality Fund)
MFUS (PIMCO RAFI Dynamic Multi-Factor U.S. Equity ETF)
MFV (MFS Special Value Trust)
MG (Mistras Group, Inc.)
MGA (Magna International Inc.)
MGAM (Multimedia Games Holding Company, Inc.)
MGC (Vanguard Mega Cap Index Fund ETF Shares)
MGCD (MGC Diagnostics Corporation)
MGEE (MGE Energy, Inc.)
MGEN (Miragen Therapeutics, Inc.)
MGF (MFS Government Markets Income Trust)
MGH (Minco Gold Corporation)
MGI (MoneyGram International, Inc.)
MGIC (Magic Software Enterprises Ltd.)
MGK (Vanguard Mega Cap Growth Index Fund ETF Shares)
MGU (Macquarie Global Infrastructure Total Return Fund Inc.)
MGV (Vanguard Mega Cap Value Index Fund ETF Shares)
MGY (Magnolia Oil & Gas Corporation)
MGYR (Magyar Bancorp, Inc.)
MHD (BlackRock MuniHoldings Fund, Inc.)
MHE (BlackRock Massachusetts Tax-Exempt Trust)
MHF (Western Asset Municipal High Income Fund Inc.)
MHFI (McGraw Hill Financial, Inc.)
MHG (Marine Harvest ASA)
MHGC (Morgans Hotel Group Co.)
MHH (Mastech Digital, Inc.)
MHI (Pioneer Municipal High Income Trust)
MHK (Mohawk Industries, Inc.)
MHLD (Maiden Holdings, Ltd.)
MHN (BlackRock MuniHoldings New York Quality Fund, Inc.)
MHO (M/I Homes, Inc.)
MHR (Magnum Hunter Resources Corp.)
MHY (Western Asset Managed High Income Fund Inc.)
MIDD (The Middleby Corporation)
MIDF (iShares Edge MSCI Multifactor USA Mid-Cap ETF)
MIDU (Direxion Daily Mid Cap Bull 3X Shares)
MIDZ (Direxion Daily Mid Cap Bear 3X Shares)
MIE (Cohen & Steers MLP Income and Energy Opportunity Fund, Inc.)
MIFI (Novatel Wireless Inc.)
MILL (Miller Energy Resources, Inc.)
MILN (Global X Millennials Thematic ETF)
MIME (Mimecast Limited)
MIN (MFS Intermediate Income Trust)
MINC (AdvisorShares Newfleet Multi-Sector Income ETF)
MIND (MIND Technology, Inc.)
MINDP (Mitcham Industries, Inc.)
MINI (Mobile Mini, Inc.)
MINT (PIMCO Enhanced Short Maturity Active ETF)
MIRM (Mirum Pharmaceuticals, Inc.)
MIRN (Mirna Therapeutics, Inc.)
MIST (Milestone Pharmaceuticals Inc.)
MITSY (Mitsui & Co. Ltd.)
MITT (AG Mortgage Investment Trust, Inc.)
MIW (Eaton Vance Michigan Municipal Bond Fund)
MIXT (MiX Telematics Limited)
MIY (BlackRock MuniYield Michigan Quality Fund, Inc.)
MJ (ETFMG Alternative Harvest ETF)
MJN (Mead Johnson Nutrition Company)
MJO (MicroSectors Cannabis 2X Leveraged ETNs)
MJX (ETFMG Alternative Harvest ETF)
MKC (McCormick & Company, Incorporated)
MKC-V (McCormick & Company, Incorporated)
MKD (Molecular Data Inc.)
MLAB (Mesa Laboratories, Inc.)
MLAC (Malacca Straits Acquisition Company Limited)
MLACU (Malacca Straits Acquisition Company Limited)
MLCO (Melco Resorts & Entertainment Limited)
MLHR (Herman Miller, Inc.)
MLI (Mueller Industries, Inc.)
MLM (Martin Marietta Materials, Inc.)
MLN (VanEck Vectors Long Muni ETF)
MLND (Millendo Therapeutics, Inc.)
MLP (Maui Land & Pineapple Company, Inc.)
MLPA (Global X MLP ETF)
MLPB (UBS ETRACS Alerian MLP Infrastructure Index ETN Series B)
MLPC (C-Tracks ETNs on the Miller/Howard MLP Fundamental Index)
MLPE (C-Tracks ETNs on the Miller/Howard MLP Fundamental Index B)
MLPG (UBS ETRACS Alerian Natural Gas MLP Index ETN)
MLPI (UBS ETRACS Alerian MLP Infrastructure Index ETN)
MLPJ (Global X Junior MLP ETF)
MLPL (UBS ETRACS 2xM Lvg Lng Alrn MLP Infr ETN)
MLPN (Credit Suisse X-Links CushgMLPInfrasETN)
MLPO (Credit Suisse S&P MLP Index ETN)
MLPQ (UBS ETRACS 2xMonthly Leveraged Alerian MLP Infrastructure Index ETN SeriesB)
MLPS (UBS ETRACS 1xM Shrt Alrn MLP Infr TR ETN)
MLPV (UBS ETRACS 2xMonthly Lvg S&P MLP ETN)
MLPW (UBS ETRACS Wells Fargo MLP ETN)
MLPX (Global X MLP & Energy Infrastructure ETF)
MLPY (Morgan Stanley Cushing MLP High Income Index ETN)
MLPZ (UBS ETRACS 2xMonthly Leveraged S&P MLP Index ETN Series B)
MLQD (iShares 5-10 Year Investment Grade Corporate Bond ETF)
MLR (Miller Industries, Inc.)
MLSS (Milestone Scientific Inc.)
MLTI (Credit Suisse X-Links Multi-Asset High Income ETN)
MLVF (Malvern Bancorp, Inc.)
MM (Millennial Media Inc.)
MMAC (MMA Capital Holdings, Inc.)
MMC (Marsh & McLennan Companies, Inc.)
MMD (MainStay MacKay DefinedTerm Municipal Opportunities Fund)
MMDM (Modern Media Acquisition Corp.)
MMDMU (Modern Media Acquisition Corp.)
MMI (Marcus & Millichap, Inc.)
MMIN (IQ MacKay Municipal Insured ETF)
MMIT (IQ MacKay Municipal Intermediate ETF)
MMLP (Martin Midstream Partners L.P.)
MMSI (Merit Medical Systems, Inc.)
MMT (MFS Multimarket Income Trust)
MMTM (SPDR S&P 1500 Momentum Tilt ETF)
MMU (Western Asset Managed Municipals Fund Inc.)
MMV (Eaton Vance Massachusetts Municipal Income Trust)
MMX (Maverix Metals Inc.)
MNCL (Monocle Acquisition Corporation)
MNCLU (Monocle Acquisition Corporation)
MNDL (Mandalay Digital Group, Inc.)
MNDO (MIND C.T.I. Ltd)
MNE (BlackRock Muni New York Intermediate Duration Fund, Inc.)
MNGA (Taronis Technologies, Inc.)
MNLO (Menlo Therapeutics Inc.)
MNOV (MediciNova, Inc.)
MNP (Western Asset Municipal Partners Fund Inc.)
MNPR (Monopar Therapeutics Inc.)
MNR (Monmouth Real Estate Investment Corporation)
MNRK (Monarch Financial Holdings, Inc.)
MNSO (MINISO Group Holding Limited)
MNST (Monster Beverage Corporation)
MNTA (Momenta Pharmaceuticals, Inc.)
MONT (Montage Technology Group Limited)
MONY (iShares Financials Bond)
MOO (VanEck Vectors Agribusiness ETF)
MORL (UBS ETRACS Monthly Pay 2xLeveraged Mortgage REIT ETN)
MORN (Morningstar, Inc.)
MORT (VanEck Vectors Mortgage REIT Income ETF)
MOTI (VanEck Vectors Morningstar International Moat ETF)
MOTO (SmartETFs Smart Transportation & Technology ETF)
MOTS (Motus GI Holdings, Inc.)
MPA (BlackRock MuniYield Pennsylvania Quality Fund)
MPAA (Motorcar Parts of America, Inc.)
MPAC (Matlin & Partners Acquisition Corporation)
MPACU (Matlin & Partners Acquisition Corporation Units)
MPB (Mid Penn Bancorp, Inc.)
MPC (Marathon Petroleum Corporation)
MPCT (iShares MSCI Global Impact ETF)
MPEL (Melco Crown Entertainment Limited)
MPET (Magellan Petroleum Corporation)
MPO (Midstates Petroleum Company, Inc.)
MPSX (Multi Packaging Solutions International Limited)
MPV (Barings Participation Investors)
MPVD (Mountain Province Diamonds Inc.)
MPW (Medical Properties Trust, Inc.)
MPWR (Monolithic Power Systems, Inc.)
MPX (Marine Products Corporation)
MQT (BlackRock MuniYield Quality Fund II, Inc.)
MQY (BlackRock MuniYield Quality Fund, Inc.)
MR (Montage Resources Corporation)
MRAM (Everspin Technologies, Inc.)
MRBK (Meridian Bank (Paoli, PA))
MRD (Memorial Resource Development Corp.)
MRDN (Attis Industries, Inc.)
MREO (Mereo BioPharma Group plc)
MRO (Marathon Oil Corporation)
MRRL (UBS ETRACS Monthly Pay 2xLeveraged Mortgage REIT ETN Series B)
MRSN (Mersana Therapeutics, Inc.)
MSBF (MSB Financial Corp.)
MSBI (Midland States Bancorp, Inc.)
MSC (Studio City International Holdings Limited)
MSDI (Monster Digital, Inc., Prior to Reverse Merger with Innovate Biopharmaceuticals, Inc.)
MSEX (Middlesex Water Company)
MSF (Morgan Stanley Emerging Markets Fund, Inc.)
MSFG (MainSource Financial Group, Inc.)
MSFT (Microsoft Corporation)
MSG (Madison Square Garden Sports Corp.)
MSGE (Madison Square Garden Entertainment Corp.)
MSGN (MSG Networks Inc.)
MSGS (Madison Square Garden Sports Corp.)
MSM (MSC Industrial Direct Co., Inc.)
MSN (Emerson Radio Corp.)
MSO (Martha Stewart Living Omnimedia Inc.)
MSTB (LHA Market State Tactical Beta ETF)
MSTR (MicroStrategy Incorporated)
MSTX (Mast Therapeutics, Inc.)
MSUS (LHA Market State U.S. Tactical ETF)
MSVB (Mid-Southern Bancorp, Inc.)
MSXX (PureFunds ISE Mining Service ETF)
MTGP (WisdomTree Mortgage Plus Bond Fund)
MTH (Meritage Homes Corporation)
MTK (SPDR Morgan Stanley Technology ETF)
MTS (Montgomery Street Income Securities, Inc.)
MTSC (MTS Systems Corporation)
MTSI (MACOM Technology Solutions Holdings, Inc.)
MTSL (Mer Telemanagement Solutions Ltd.)
MTSN (Mattson Technology Inc.)
MTT (Western Asset Municipal Defined Opportunity Trust Inc.)
MTU (Mitsubishi UFJ Financial Group, Inc.)
MTUM (iShares MSCI USA Momentum Factor ETF)
MTW (The Manitowoc Company, Inc.)
MUA (BlackRock MuniAssets Fund, Inc.)
MUAC (iShares 2014 AMT-Free Muni Term)
MUAD (iShares 2015 AMT-Free Muni Term)
MUAE (iShares 2016 AMT-Free Muni Term)
MUAF (iShares 2017 AMT-Free Muni Term)
MUAG (iShares 2018 AMT-Free Muni Term)
MUAH (iShares 2019 AMT-Free Muni Term)
MUB (iShares National Muni Bond ETF)
MUC (BlackRock MuniHoldings California Quality Fund, Inc.)
MUDS (Mudrick Capital Acquisition Corporation)
MUDSU (Mudrick Capital Acquisition Corporation)
MUE (BlackRock MuniHoldings Quality Fund II, Inc.)
MUFG (Mitsubishi UFJ Financial Group, Inc.)
MUH (BlackRock MuniHoldings Fund II, Inc.)
MUI (BlackRock Muni Intermediate Duration Fund, Inc.)
MUJ (BlackRock MuniHoldings New Jersey Quality Fund, Inc.)
MULE (MuleSoft, Inc.)
MULT (AdvisorShares Snrse Glbl Multi-Strat ETF)
MUNI (PIMCO Intermediate Municipal Bond Active ETF)
MUR (Murphy Oil Corporation)
MUS (BlackRock MuniHoldings Quality Fund, Inc.)
MUSA (Murphy USA Inc.)
MUST (Columbia Multi-Sector Municipal Income ETF)
MUTE (Direxion Daily Communication Services Index Bear 3X Shares)
MVIN (Natixis Seeyond International Minimum Volatility ETF)
MVIR (MultiVir, Inc.)
MVIS (MicroVision, Inc.)
MWE (MarkWest Energy Partners, L.P.)
MWIV (MWI Veterinary Supply, Inc.)
MWK (Mohawk Group Holdings, Inc.)
MX (MagnaChip Semiconductor Corporation)
MXA (Minnesota Municipal Income Portfolio Inc.)
MXC (Mexco Energy Corporation)
MXDE (Nationwide Maximum Diversification Emerging Markets Core Equity ETF)
MXDU (Nationwide Maximum Diversification U.S. Core Equity ETF)
MXE (Mexico Equity & Income Fund Inc.)
MXN (First American Minnesota Municipal Income Fund II Inc.)
MXPT (MaxPoint Interactive, Inc.)
MXT (Maxcom Telecomunicaciones S.A.B. de C.V.)
MXWL (Maxwell Technologies, Inc.)
MY (China Ming Yang Wind Power Group Limited)
MYC (Blackrock MuniYield California Fund, Inc.)
MYF (BlackRock MuniYield Investment Fund)
MYGN (Myriad Genetics, Inc.)
MYI (BlackRock MuniYield Quality Fund III, Inc.)