Correct CC, that's because Infinity is a subsidiary of Transact. The key difference between the two - as far as I am able to discern - is that with Infinity you get awesome customer service but precious little with Transact. That's just my impression - which may be wrong. What I am certain about is the great customer service I receive from Infinity - it completely knocks spots of my two previous brokers: IB and TradeStation. I love 'em to bits and recommend them heartily to all and sundry.
Tim.