Major Public Companies

• Business: Investing: Stocks and Bonds: Exchanges 

• M&T Bank  - Regional bank headquartered in New York with branches in various US states.
• Magellan Health Services  - Information on the company's products and services, market, investor relations, and career opportunities.
• Manitowoc  - Creator of engineered capital goods and support services for the crane, food service, and marine markets.
• Manor Care  - Operates a number of nursing homes and assisted-living and outpatient facilities throughout the United States.
• Manpower Inc.  - Company specializing in manpower recruitment, training, assessment, selection, outsourcing, and consulting services.
• Marathon Oil Corporation  - Overview of the company and information on business operations, investor relations, corporate values, and career opportunities.
• Markel Corporation  - Insurer offers insurance coverage not usually provided by traditional companies. Insures antiques, amusement parks, thoroughbred horses, summer camps, and more.
• Marriott International, Inc.  - Offers corporate information including hotel room reservation service with special packages and even dates.
• Marsh & McLennan  - Risk, strategy and human capital advice and solutions provider serving an international clientele.
• Marshall & Ilsley Corporation  - Wisconsin-based diversified financial services company offers comprehensive financial products and services to personal, business, corporate, an and institutional customers.
• Martin Marietta Materials  - United States construction aggregates producer and supplier of crushed stone, sand, gravel, and other foundational construction materials.
• Masco  - Manufacturer and distributor of branded consumer products for the home and family.
• Massey Energy  - US coal miner produces steam and metallurgical coal primarily in the Appalachian region.
• MasterCard  - Company specializing in payment systems that involve credit and debut cards. Provides services to over 210 global territories.
• Mattel  - International toy maker responsible for Barbie dolls, Fisher-Price toys, Hot Wheels, Matchbox cars, and various other toys.
• Maxim Integrated Products  - Company manufactures a wide range of analog and mixed-signal integrated circuits (ICs), including amplifiers, data converters, and timing and switching ICs.
• MBIA  - Provider of insurance for municipal bonds, asset and mortgage based securities, and stable corporate bonds.
• McClatchy Company  - United States newspaper company with publications in both print and interactive formats.
• McCormick  - Company's website presents information on products and promotions, a searchable recipe database, press materials, and spice guides.
• McDonald's  - Fast-food company well known for its Big Macs, Quarter Pounders, and Chicken McNuggets.
• McGraw-Hill  - Education, publishing, broadcasting, and financial and business services company headquartered in Rockefeller Center in New York City.
• MDC Holdings  - Colorado based homebuilder provides single-family detached homes and townhomes.
• MDU Resources Group  - Mines for and markets construction materials, explores and produces oil and gas, and provides natural gas transmission, gathering, and storage services.
• MeadWestvaco  - Richmond, Virginia based pulp and paper company. Produces packaging, coated and specialty papers, consumer and office products, and specialty chemicals.
• Medco Health Solutions  - Pharmacy benefits management and specialty pharmacy company. Designs drug formularies, negotiates discounts with pharmaceutical companies, and processes claims.
• Medtronic  - Publicly-traded medical technology company offers various medical devices for pain alleviation and health restoration.
• Mellon Financial Corporation  - Site provides information on the bank's history, management, business operations, awards, and investor relations.
• Men's Wearhouse  - Seller of various men's wear. Site provides information on the brands and products offered along with articles and a "Menswear Encyclopedia.".
• Merck  - Research-driven pharmaceutical company provides a wide range of products for the global health care market.
• Mercury General  - Site provides information on the insurance company's products, claims services, investor relations, contacts, and locations.
• Meredith Corporation  - Magazine publisher and mass media company operating a number of radio and television stations across the United States.
• Meritage Homes  - Real estate developer sells houses and other residential properties for move-up homebuyers and the luxury market.
• Merrill Lynch  - Investment firm provides financial services for private, institutional, and government clients. Services offered include mutual fund, insurance, annuity, trust, and clearing.
• Metal Management  - US metal recycling company processes both ferrous and nonferrous materials.
• Metals USA  - North American metal service company provides building products, plates and shapes, and flat rolled and non-ferrous materials.
• Mettler Toledo  - Australian maker of computerized scales, analytical balances, and other weighing instruments.
• MGM Mirage  - Gaming firm's website provides information on investor relations, reservations, events, and retail vendor compliance.
• Michaels Arts and Crafts Store.  - Major company specializes in various craft works such as beads, paper crafts, framing, floral arrangements, home décors, scrapbooking, and more.
• Micron Technology  - Multinational company headquartered in Boise, Idaho produces several forms of semiconductor devices.
• Microsoft Corporation  - Provides an overview of its licensed software products including Internet Explorer downloads and updates.
• Mirant  - Atlanta-based energy company involved in the production and sale of electricity in the United States, the Caribbean, and the Philippines.
• Modine Manufacturing Company  - Provider of auto products and automotive heat exchangers and parts for heating, ventilating, and air-conditioning (HVAC) systems.
• Mohawk Industries  - US maker of commercial and residential carpets and rugs. Also manufactures ceramic tile and stone flooring.
• Molex  - Company manufactures electronic components such as switches, application tooling, and electrical and fiber optic interconnection products and systems.
• Molina Healthcare  - Managed health care company specializing in the provision of health coverage to low-income families and individuals.
• Molson Coors Brewing  - Brewery company serves the Canada, United Kingdom, and United States markets.
• Monsanto Imagine  - Develops and markets sustainable agricultural chemicals, crop biotechnology, and other related products aimed at augmenting farmers' produce.
• Moody's  - Bond rating services company also rates commercial paper, preferred and common stock, and municipal short-term bond issues.
• Morgan Stanley  - Investment bank operates four primary business segments: institutional securities, global wealth management, asset management, and financial services.
• Mosaic  - Manufacturer of phosphate, potash, and nitrogen fertilizers and feed ingredients.
• Motorola, Inc.  - Presents company information and features integrated communication products and services available for purchase.
• Movie Gallery  - Video and game rental company operating stores and franchises in all 50 US states and in Canada.
• MPS Group  - Staffing company trains and provides personnel and personnel services to European and North American clients.
• Mueller Industries  - Manufacturer of copper tube and fittings, plastic fittings, steel pipes and faucets, valves, brass rod, and nonferrous forgings.
• Murphy Oil Corporation  - Information on investor relations, corporate governance and responsibility, and exploration, production, and refining operations.
• Mutual of America  - Life insurance and retirement company. Site provides product details, market updates, and featured articles.
• Mutual of Omaha Insurance  - Life insurance company based in Omaha, Nebraska. Primarily sells health and disability insurance.