RJ O’Brien transfer propels StoneX into top 10 FCMs
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Customer funds jump 61% after futures services move across
StoneX Financial became the eighth-largest futures commission merchant (FCM) by futures and options (F&O) customer funds after trading and clearing services were transferred from RJ O’Brien Associates on May 31.
StoneX completed the acquisition of RJ O’Brien on July 31, 2025, but F&O activity previously handled by the Chicago-based broker began appearing under StoneX following the transfer of
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