Below is a three month price history chart comparing the stock performance of KMX vs.

FORBES: Carmax Achieves #107 Analyst Rank, Surpassing Cigna

At the closing bell, VRSK is off about 0.5%, while KMX is off about 0.4% on the day Monday.

FORBES: Verisk Analytics Moves Up In Market Cap Rank, Passing Carmax

CarMax Inc. ( KMX) reports its earnings before the opening on Thursday.

FORBES: 3 Earnings Stocks to Watch

CarMax (KMX) reports its third quarter earnings on Thursday, December 20, 2012.

FORBES: Earnings Preview: CarMax

Buffett also zeroed out his holdings in Iron Mountain ( IRM), CarMax ( KMX), NRG Energy ( NRG) and Home Depot ( HD).

FORBES: Buffett Leaves Gates With A Garbage Stock

In addition to picking up Kraft and Glaxo, Berkshire fattened its stake in CarMax (nyse: KMX - news - people ).

FORBES: Buffett Takes A Big Bite Of Kraft, Glaxo

According to the ETF Finder at ETF Channel, VRSK and KMX collectively make up 1.26% of the Vanguard Mid-Cap Growth ETF (VOT) which is lower by about 0.2% on the day Monday.

FORBES: Verisk Analytics Moves Up In Market Cap Rank, Passing Carmax

Ivan Feinseth, research director at Matrix USA, says more bad news is to come because of the slowdown in auto sales and increased competition from big guys like AutoNation (nyse: AN - news - people ) and CarMax (nyse: KMX - news - people ) .

FORBES: Roadkill