CME Group Inc. (formerly Chicago Mercantile Exchange Holdings Inc.), headquartered in Chicago, Illinois, operates exchanges and provides clearing services for trading in financial derivatives such as futures contracts, options, and swaps. Its exchanges include the Chicago Mercantile Exchange (CME), the Chicago Board of Trade (CBOT), the New York Mercantile Exchange (NYMEX), and the Commodity Exchange (COMEX). The company also owns 27% of S&P Dow Jones Indices.

The company operates the Globex Trading System, an electronic trading platform that allows customers in approximately 150 countries to trade futures and options contracts. The company also operates two platforms for spot market trading: BrokerTec, which facilitates dealer-to-dealer trading in fixed-income products, and EBS, which provides spot trading in foreign exchange markets. CME Clearing serves as a counterparty to every transaction cleared by the company.

Financial derivatives traded on CME's exchanges are tied to interest rates (primarily SOFR or United States Treasury securities; 51% of 2025 volume), stock market indexes (primarily E-mini contracts on the S&P 500 and Nasdaq-100; 26% of 2025 volume), energy-related products (primarily oil and natural gas; 10% of 2025 volume), agricultural products (primarily corn, soybeans, and wheat; 7% of 2025 volume), exchange currencies (primarily with the Euro, Japanese yen, British pound, and Australian dollar; 3% of 2025 volume), metals (primarily gold, silver, and copper; 3% of 2025 volume), and cryptocurrency (primarily Bitcoin and Ether; negligible volume in 2025).

Institutional trading represents 85% to 90% of the company's trading volume.

In 2025, 81% of the company's revenues were from clearing and transaction fees, 12% of revenues were from market data fees, and 7% of revenues were from other sources, primarily access and communication fees. In 2025, over 7 billion futures and options contracts were traded on the company's platforms; the company received average fees of $0.70 per contract traded. The company has witnessed increased trading volumes during periods of high market volatility.

The Chicago Mercantile Exchange (CME), was founded in 1898 as a nonprofit corporation. In 1919, it established its clearing house. In 1982, CME introduced the first successful stock index futures contract, helping change equity risk management and creating today's equity index derivatives market. In 2000, CME demutualized and became a joint stock company. In 2002, CME Holdings Company, the parent company of CME, became a public company via an initial public offering.

In June 2007, the company, in partnership with Dubai Holding and Oman Investment Authority, launched the Dubai Mercantile Exchange, of which it owns 33%.

In July 2007, CME merged with the holding company for the Chicago Board of Trade, founded in 1848, in an $8 billion transaction that created the world's largest financial market, and became CME Group Inc., a CME/Chicago Board of Trade Company.

The company's board of directors consists of 19 members, compared to an average of 11 members for companies in the S&P 500. Holders of Class B shares, representing owners of exchange seats, have the right to elect 6 members. In August 2018, the company offered holders of Class B shares about $10 million to relinquish control of their board seats. The proposal was rejected by shareholders. A similar proposal was introduced in 2026 but failed to reach the required quorum of Class B shareholders.

The company is the title sponsor of the CME Group Tour Championship, the season-ending tournament of the LPGA tour of women's golf.