O'Connor & Associates was a Chicago-based options trading firm, with a particular emphasis on financial derivatives.
[1] The acquisition was part of Swiss Bank's efforts to expand its options trading capabilities in the United States.
At the time of the acquisition, O'Connor & Associates had over 500 employees and was one of the largest options trading firms in the world.
The O'Connors provided Greenbaum, who had run risk management for First Options, with the capital to start his own firm.
[9] SBC had established a strategic relationship with O'Connor, which was the largest market maker in the financial options exchanges in the U.S., beginning in 1988.