Group One Trading LP

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Founded in 1989, Group One Inc. is one of the largest options trading firms in the United States. The firm operates three business divisions, including technology, trading and risk management. Group One Inc. deals in several exchanges nationwide, including NYSE AMEX, NASDAQ OMX PHLX, the Chicago Board Options Exchange, One Chicago and NYSE ARCA OX. Additionally, it provides arbitrage and algorithmic trading desks. Group One Inc. operates over four office locations based in New York, Pennsylvania, Illinois and California.