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StoneX Ranks Eighth-Largest FCM After RJ O'Brien Transfer

Created at 8 Jul · 3:40 AM1 source↑ Market-relevant
IN SHORT

StoneX Financial has become the eighth-largest futures commission merchant (FCM) by customer funds following the transfer of futures and options trading and clearing services from RJ O’Brien Associates. The move, effective May 31, saw customer funds jump 61%.

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Key Numbers

61%Customer funds jump

Who's Involved

StoneX Financial
Became eighth-largest FCM after service transfer
RJ O’Brien Associates
Transferred futures and options services to StoneX

↳ Why This Matters

The transfer of services and subsequent increase in customer funds marks a significant step in StoneX's growth and market position within the futures commission merchant sector.

Key facts

  • StoneX Financial is now the eighth-largest futures commission merchant (FCM) by futures and options (F&O) customer funds.
  • The change occurred after trading and clearing services were transferred from RJ O’Brien Associates.
  • The transfer of services was completed on May 31.
  • StoneX acquired RJ O’Brien on July 31, 2025.

StoneX Financial has ascended to become the eighth-largest futures commission merchant (FCM) in terms of customer funds, following a significant transfer of futures and options (F&O) trading and clearing services from RJ O’Brien Associates. This strategic move, effective May 31, resulted in a substantial 61% increase in StoneX's customer funds. The acquisition of RJ O’Brien by StoneX was finalized on July 31, 2025, with the F&O activities previously managed by the Chicago-based broker now operating under the StoneX umbrella.

Frequently asked questions

A futures commission merchant (FCM) is a firm that solicits or accepts orders to buy or sell futures or options on futures and that accepts money or other assets from customers to support such orders.

The transfer of futures and options trading and clearing services from RJ O’Brien Associates to StoneX Financial occurred on May 31.

StoneX completed the acquisition of RJ O’Brien on July 31, 2025.

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Cadence

How It Developed

StoneX Financial became the eighth-largest futures commission merchant by customer funds.
Futures and options trading and clearing services were transferred from RJ O’Brien Associates.
The transfer of services occurred on May 31.
StoneX completed the acquisition of RJ O’Brien on July 31, 2025.

Sources

T1
RJ O’Brien transfer propels StoneX into top 10 FCMsRisk.net

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