Trader Radar - Wednesday Jan. 16th

Q: On Fast Money’s trader radar we look at the stock that was lighting up screens all across Wall Street. Fittingly, this is a firm made up of traders. Based in Jersey City, NJ -- the brokerage makes a market in over 17,000 equities. And while most financial firms are experiencing credit crunch-induced volatility earnings Wednesday showed this trading pure play is investors' knight in shining armor. Who is it?

A: Knight Capital is on the trader radar. The stock traded four times its average daily volume and NITE was among the most searched symbols on the internet.