Trading activity picked up in online options broker OptionXpress (OXPS) Monday. Shares are off 55 cents, or 3.5%, to $15.15 and option volume is 4X daily average. Puts are outpacing calls by a margin of 3:1. The feature trade is the purchase of the September 15 – 17.5 put spread 250X. Open interest in the 17.5s is sufficient to cover and this might be a defensive rolling down of short put (bullish position) that was established on June 10 when shares were trading $17.20 and the same 17.5 puts were trading $2.55 a contract. Other online brokers such as Ameritrade (AMTD) have also lost over 15% in past two weeks as trading volume has dried up.