R.J. O'Brien Email Format

Financial ServicesIllinois, United States501-1000 Employees

R.J. O'Brien & Associates LLC is a financial services company that operates as a futures brokerage and clearing firm, headquartered at 222 South Riverside Plaza Suite 1200, Chicago, Illinois 60606, and it has between 501 and 1,000 employees. It is a futures commission merchant (FCM) and is described as the oldest and largest independent futures brokerage and clearing firm in the United States, with a boutique profile. The firm is a full clearing member of CME Group and all its markets, Intercontinental Exchange, NYSE Liffe U.S., and the CBOE Futures Exchange, providing 24-hour execution and clearing on futures exchanges worldwide. It serves a global network of introducing brokers and clients, including more than 400 introducing brokers and many large financial, industrial, and agricultural institutions, and it clears more than 100,000 client accounts while not engaging in proprietary trading. In 2025, StoneX Group announced an agreement to acquire R.J. O'Brien Limited, and the company maintains a website at https://rjobrien.com.

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