StoneX is set to acquire the global businesses of US clearing broker RJ O’Brien & Associates (RJO).

Gerry Corcoran
The merger is expected to be completed in Q3 2025 and marks an important step for StoneX as it seeks to provide greater access to liquidity in fixed income markets.
StoneX is set to add over 75,000 of RJO’s client accounts following the acquisition, including brokers, commercial and institutional clients and individual investors, who will be given access to a wide range of markets, products and services such as StoneX’s over the counter (OTC) hedging platform.
The move is also set to expand StoneX’s client float by almost $6 billion, with clear listed derivatives volume projected to increase by 190 million contracts annually.
Chief executive and chairman of RJO, Gerry Corcoran, will continue in a senior leadership role with StoneX as part of the acquisition.
“In addition to all the products we offer today, our clients and brokers will have a plethora of new products and services across asset classes available at their fingertips, bringing meaningful new trading and hedging opportunities,” said Corcoran.
“At the same time, our organisation will benefit from new efficiencies, premier technologies, and greater growth potential.”
StoneX’s merger with RJO follows recent acquisitions of investment banking firm, The Benchmark Company and Paris-based fixed income brokerage firm, Octo Finances earlier this year.
Read more: StoneX adds investment banking capabilities with acquisition of The Benchmark Company
Sean O’Connor, executive vice-chair of StoneX, said: “This is a transformational transaction for StoneX, establishing us as a leading global derivatives clearing firm and reinforcing our position as an integral part of the global market structure across asset classes.
“Combining RJ O’Brien’s extensive client network and proven clearing capabilities with StoneX’s deep liquidity, innovative OTC hedging solutions, and leading risk management infrastructure, we are well-positioned to continue to deliver exceptional services, broader market access, and industry-leading trading solutions to our combined client base.”