Chicago Board Options Exchange Incorporated · Chicago, IL United States

First there was one. The Chicago Board Options Exchange (CBOE) may no longer be the only options exchange, but it's still the US leader in overall volume. Member-owned and founded in 1973 by the Chicago Board of Trade (which is now part of CME Group), CBOE lists options on more than 1,900 stocks, as well as on interest rates, broad-based stock indexes (such as Standard & Poor's S&P 500 Index), and industry indexes. CBOE, which had already launched the fully electronic CBOE Futures Exchange, debuted its CBOE Stock Exchange in early 2007, going head-to-head with the New York Stock Exchange and NASDAQ. CBOE also runs The Options Institute, which trains brokers and investors in all aspects of options. To read the full description, subscribe now.

• The NASDAQ OMX Group, Inc.
• NYSE Euronext
• CME Group Inc.