Business & Finance CarMax, Inc (KMX), Berkshire Hathaway Inc. (BRK.A), Walt Disney Co (DIS): Markel Gayner Asset Management’s Top 3 Stock PicksBy Neha GuptaNovember 13, 2014 Markel Gayner Asset Management, a fund managed by Tom Gayner, filed its latest 13F report and disclosed its three largest…