Trader Radar - Friday December 19th

Q: On Fast Money’s trader radar we look at the stock that was lighting up screens across Wall Street. This publicly-traded used-car dealer was created by Circuit City executives in 1991. And while that electronics chain may have gone bankrupt this year, this company managed to remain profitable until the last quarter in the face crashing consumer credit. But today the dealer's stock got a jumpstart from President Bush, after the White House gave a lifeline to GM and Chrysler. Who is it?

A: On the trader radar tonight we’re watching Carmax! The biggest domestic used-car dealer was among the most active names on the NYSE today.