Trivago NV gained in the extended session Thursday after the online hotel booking site raised its outlook for the year following the earnings release of majority shareholder Expedia Inc. . U.S. shares of D�sseldorf, Germany-based Trivago rose 3.8% to $15.80 after hours. "Given our strong start to the year, we have increased our full-year guidance and now expect annual revenue growth to be around 50% in 2017," said Trivago Chief Financial Officer Axel Hefer in a statement. Trivago reports quarterly results on May 15. Expedia shares slipped 2% after hours as the online travel company's earnings missed Wall Street estimates by a penny.
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