CarMax up after beating quarterly estimates
** Shares of used car dealer CarMax KMX.N up ~4% at $58.64 premarket
** Co beats second-quarter revenue and profit estimates, helped by higher vehicle volumes, higher extended-protection-plan margins and lower provisions for loan losses
** Reports Q2 revenue of $7.88 billion, topping analysts' estimates of $7.01 billion - data compiled by LSEG
** Posts quarterly profit of $1.16, compared with expectations of 74 cents
** Logs quarterly wholesale vehicle unit sales increase of 14.7%
** Co says it plans to resume share repurchases in Q3
** As of last close, stock up about 46% YTD