M
M&A - Mergers and Acquisitions (combination of two or more companies)
MAC - media access control (permanent hardware address identifier burned into a network interface card (NIC) when it is manufactured)
MAC - mandatory access control (model/framework where users meeting specific, assigned criteria are given access - military, classified systems)
MAC - message authentication code (verification mechanism using encryption keys)
MACD - Moving Average Convergence/Divergence (method of valuing stocks/analyzing market trends)
MACRS - Modified Accelerated Cost Recovery System (accelerated depreciation method)
MAN - metropolitan-area network (network interconnections within a metropolitan area)
MAP - manufacturing accounting and production (integrated manufacturing system model)
MAS - Management Advisory Services (consulting services performed by CPA firms in areas other than auditing)
MASEC - Management Advisory Services Executive Committee
MBA - Master of Business Administration
MBARS - Municipal Bond Acceptance and Reconciliation Service
MBIA - Municipal Bond Investors Assurance Corporation (insurer guaranteeing municipal bonds in the event of default)
MBO - Management Buyout (purchase of all of a company's publicly-held shares by existing management, taking company private)
MBO - Management By Objective (system of performance appraisal using short-term targets and periodic reviews)
MBS - Mortgage-Backed Security (certificate/security backed by mortgages)
MBSCC - Mortgage-Backed Securities Clearing Corporation (SEC-registered company providing services to the mortgage-backed securities market)
MC - marginal cost (increase of decrease in cost as the result of producing one additional unit)
MCE - Malaysia Commodity Exchange
MDA - multiple discriminant analysis (statistical technique used to evaluate financial ratios)
MEC - Marginal Efficiency of Capital (annual percentage yield earned by the last additional unit of capital)
MER - management expense ratio (mutual fund accounting - operating costs as a percentage of net assets)
MERC - Chicago Mercantile Exchange (exchange trading futures and options)
MFL - maximum foreseeable loss (maximum dollar amount which can be lost if a catastrophe occurs)
MFN - Most Favored Nation (treaty terms/regulations granting certain nations favorable tariff rates)
MFOA - Municipal Finance Officers Association (organization of financial officers working for cities/municipalities)
MHR - Member of the U.S. House of Representatives
MIA - Malaysian Institute of Accountants (regulatory body for accounting and auditing)
MIBOR - Madrid Interbank Offered Rate (rate for large loans to banking institutions)
MICEX - Moscow Interbank Currency Exchange (Russian currency/financial exchange)
MICPA - Malaysian Institute of Certified Public Accountants (professional accounting organization)
MIDAS - Market Information Data Access System (Nasdaq online system)
MIPS - Monthly Income Preferred Securities (hybrid income-preferred stock traded as securities which make cumulative monthly payments)
MIRR - Modified Internal Rate of Return (internal rate of return adjusted for negative cash flows)
MIS - Management Information System (computer-based or manual system used for collecting, processing, and reporting data in a manner useful for decision-making)
MIT - Massachusetts Institute of Technology
MIT - Municipal Investment Trust (trust fund which buys municipal bonds and passes tax-free income on to shareholders)
MITTS - Market Index Target Term Securities (debt securities guaranteeing the original investment plus appreciation at maturity)
ML - marginal loss
MLP - Master Limited Partnership (publicly-traded partnership which provided favorable tax treatment for investors until 1987, when was treated as a corporation)
MLP - minimum lease payment (regular rental payments in a capital lease)
MLR - Minimum Lending Rate
MNC - Multinational Corporation (corporation that has production facilities/fixed assets in at least one foreign country and makes management decisions in a global context)
MNE - Multinational Enterprise (alternative term for multinational corporation)
MO - money order (financial instrument that can be easily converted into cash by the payee)
MOA - Memorandum of Audit
MOAJ - manufacturing overhead applied journal
MODEM - modulator/demodulator (device that encodes data for transmission over a particular medium)
M_o_R - Management of Risk framework (strategy for dealing with risk to an organization)
MOS - maintenance out of service
MPU - mean-per-unit estimation (audit sampling technique focusing on the average audited value of items in the sample)
MPV - materials price variance (difference between price actually paid for raw materials and those that should have been paid at standard prices)
MR - marginal revenue (extra revenue from selling or producing one additional unit of product)
MRJ - materials returned journal
MRP - Manufacturing Resources Planning (integrated system designed to synchronize all aspects of business operations, not just production)
MRP - Material Requirements Planning/Processing (computer-based system designed to handle ordering and scheduling of inventory materials purchases as part of the production process)
MRQ - most recent quarter
M/S - margin of safety (excess of current sales over breakeven sales)
MSA - Medical Savings Account
MSB - Mutual Savings Bank (savings bank organized under state charter for the ownership and benefit of its depositors)
MSE - Madrid Stock Exchange (Bolsa de Madrid)
MSE - Mexican Stock Exchange
MSRB - Municipal Securities Rulemaking Board (self-regulatory organization regulating dealers in municipal securities)
MTBF - mean time between failures (how long a service is operational before it might fail)
MTBSI - mean time between service incidents (how long a service/component can perform without interruption)
MTN - medium-term note
MTRS - mean time to restore service (how quickly service can be restored to normal)
MTTR - mean time to repair (how long it takes to restore service)
MUA - money unit accounting (constant dollar accounting)
MUD - municipal utility district (local political subdivision providing utility-related services)
MUNI - Municipal Security (usually municipal bonds - debt obligations of a state or local government)
MUS - monetary unit sampling (also known as dollar-unit sampling) (audit sampling technique which defines the sampling unit as an individual dollar - larger recorded transactions are more likely to be chosen for sampling because they have more dollar units)
MUV - material usage variance (difference between quantities of raw materials used and quantities that should be used)
MX - Montreal Exchange