There are no securities or commodities exchanges in Maryland. There are 772 broker-dealers organizations selling securities in Maryland with 8,967 employees. Some 306 investment advisory companies are registered to provide services. Securities dealers in Maryland are regulated by the Division of Securities within the Attorney General's Office. Maryland has the headquarters of 99 NASDAQ companies, five NASDAQ market makers, and 10 AMEX companies. Approximately 36 NYSE companies were incorporated in Maryland, the top five according to revenues being Lockheed Martin Corp., Marriott International, Black&Decker Corp., Sodexho, and Allegheny Energy.