Zillow Group Inc. shares fell more than 6% in the extended session Monday after the company beat earnings expectations but issued weaker-than-expected second-quarter guidance. Zillow stock gained 5% during regular trading and close at $55.64. The company reported first-quarter net losses of $18.6 million, or 10 cents a share, compared with losses of $4.6 million, or 3 cents a share, in the year-ago period. Adjusted earnings were 7 cents a share. Revenue rose to $299.9 million from $245.8 million in the year-ago period. Analysts surveyed by FactSet had estimated adjusted earnings of 6 cents a share on revenue of $298 million. For the second quarter, analysts model adjusted earnings of 11 cents a share on sales of $343 million. The company said it expected second-quarter sales of $322 million to $327 million. Zillow also said that effective May 31, Chief Financial Officer Kathleen Philips will step down from that role and be temporarily replaced by the current vice president of financial reporting Jennifer Rock, until the company can find a replacement. Philips will continue to function as Chief Legal Officer through 2018. Zillow stock has gained 37% this year, with the S&P 500 index falling a fraction.