Cars.com Inc. /zigman2/quotes/210492562/composite CARS +1.52% shares declined in the extended session Monday after the online auto dealer said its chief financial officer was leaving the company. Cars.com shares declined 3.1% after hours, following a 0.5% rise to close the regular session at $12.47. The company said Becky Sheehan will step down as CFO Jan. 10 to go work for an unnamed private-equity portfolio company. Jandy Tomy, vice president of treasury and investor relations, will serve as interim CFO while the company conducts an executive search. Cars.com said it reaffirmed its outlook for the year. Analysts surveyed by FactSet expect a loss of $6.54 a share on revenue of $607.5 million.