NY Stock Exchange
The New York Stock Exchange traces its origins to a founding agreement in 1792. The NYSE registered as a national securities exchange with the U.S. Securities and Exchange Commission on October 1, 1934. The Governing Committee was the primary governing body until 1938, at which time The Exchange hired its first paid president and created a thirty-three member Board of Governors. The Board included Exchange members, non-member partners from both New York and out-of-town firms, as well as public representatives.
The NYSE mission is to add value to the capital-raising and asset- management process by providing the highest- quality and most cost-effective self-regulated marketplace for the trading of financial instruments, promote confidence in and understanding of that process, and serve as a forum for discussion of relevant national and international policy issues.

NASDAQ
NASDAQ is the largest U.S. electronic stock market. With approximately 3,300 companies, it lists more companies and, on average, trades more shares per day than any other U.S. market. It is home to category-defining companies that are leaders across all areas of business including technology, retail, communications, financial services, transportation, media and biotechnology. NASDAQ is the primary market for trading NASDAQ-listed stocks. Approximately 54% of NASDAQ-listed shares traded are reported to NASDAQ systems.

OTCBB
Over-the-Counter Bulletin Board (OTCBB) 
The OTC Bulletin Board® (OTCBB) is a regulated quotation service that displays real-time quotes, last-sale prices, and volume information in over-the-counter (OTC) equity securities. An OTC equity security generally is any equity that is not listed or traded on Nasdaq® or a national securities exchange. OTCBB securities include national, regional, and foreign equity issues, warrants, units, American Depositary Receipts (ADRs), and Direct Participation Programs (DPPs)

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