CarGurus Inc. CARG, -0.99% shares dove more than 15% in the extended session Thursday after the car company issued guidance below consensus estimates. The company reported fourth-quarter net income of $13.2 million, or 12 cents a share, compared with $12.5 million, or 11 cents a share, in the year-ago period. Adjusted for items such as stock-based compensation, earnings were 17 cents a share versus 11 cents a share a year ago. Revenue rose to $158.2 million from $126.1 million in the year-ago period. Analysts surveyed by FactSet had estimated adjusted earnings of 13 cents a share on revenue of $154.6 million. For the first quarter, analysts model adjusted earnings of 15 cents a share on sales of $163.3 million. CarGurus said it expects first-quarter adjusted earnings of 7 cents to 8 cents a share on sales of $156.5 million to $159.5 million. The company said it was anticipating full-year adjusted earnings of 50 cents a share to 55 cents a share and sales of $644 million to $676 million. CarGurus stock has fallen 15.3% in the past year, with the S&P 500 index SPX, -0.16% rising 22.8%.