O'Connor & Associates

O'Connor & Associates was a Chicago-based options trading firm, with a particular emphasis on financial derivatives. The firm was founded in 1977 by Edmund J O'Connor and his brother William O`Connor. In 1992, O'Connor & Associates was acquired by Swiss Bank Corporation. 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.

After the acquisition, O'Connor & Associates continued to operate as a subsidiary of Swiss Bank Corporation. In 1998, Swiss Bank Corporation merged with Union Bank of Switzerland to form UBS. As part of the merger, O'Connor & Associates was integrated into UBS's investment banking division. The firm continued to operate as UBS O'Connor.

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