 Shares of CarGurus Inc. CARG, -6.05 dropped 12 in the extended session Monday after the online car marketplace reported first-quarter earnings and sales that beat Wall Street expectations, but called for lower-than-expected adjusted per-share earnings for its second quarter. CarGurus said it lost 62.1 million, or 53 cents a share, in the first quarter, compared with a loss of 22.4 million, or 19 cents a share, in the year-ago period. 