Shares of CarMax rose Tuesday after the used-car retailer posted fiscal second-quarter earnings that topped analysts' estimates.

CarMax stock advanced 3.9% to $58.74 in premarket trading on Tuesday after ending Monday down 1.2%. Carvana rose 0.5%. AutoNation was flat and Group 1 Automotive added 0.3%.

CarMax posted adjusted earnings of $1.16 a share in the quarter ended Aug. 31, up from 64 cents a share a year ago and above Wall Street's expectation of 73 cents. Revenue grew 20% to $7.9 billion, beating the analyst consensus call for $7.09 billion, according to FactSet.

The company's gross profit per used retail vehicle came in at $2,105, down $111 from last year. Wall Street expected $2,022. CarMax said the slight decrease from a year ago reflected continued "pricing actions" to drive improved sales.

Combined retail and wholesale used vehicle unit sales increased 15% to 387,735.

Wall Street was focused unit sales and gross profit per used retail vehicle as signs of growth.