Group One Trading, LP

Founded in 1989, Group One Trading is one of the largest, privately-held options trading firms in the United States. The company operates as a proprietary trading firm, using its own capital to act as a specialist and market maker in U.S. exchange-listed derivatives. By leveraging advanced technology and quantitative analysis, Group One provides liquidity to the options markets across all major U.S. exchanges, trading a wide range of products from the most active to the least active.