The R.J. O'Brien Acquisition — The Most Consequential Deal in StoneX History

The $900 million acquisition of R.J. O'Brien (RJO), announced April 14, 2025 and closed July 31, 2025, is the largest and most strategically significant deal in StoneX's history. It made StoneX the largest non-bank Futures Commission Merchant (FCM) in the United States. Understanding this deal — the financials, the integration plan, and the synergy targets — is the single best signal you can give a StoneX interviewer that you actually track the company.