http://www.ft.com/intl/cms/s/0/a89e4044-9b99-11e4-950f-00144feabdc0.html#axzz3Oo9W0RdI That's pretty big news.
Seriously? DRW is a giant. Chopper is one of "the" premiere trading houses in the country, not just Chicago. DRW's fixed income operation is probably on par with Goldman. Don Wilson is a legend in the trading industry.
Here is a link to Crain's Business News for those who like myself are not a subscriber to FT: http://www.chicagobusiness.com/arti...9929/drw-trading-to-buy-rival-chopper-trading
DRW also has likely the biggest OTC Nat Gas Options book - substantially bigger presence than Timber Hill from my understanding.