The Klein Law Firm announces the commencement of an investigation of Yelp Inc. (NYSE:YELP) concerning possible violations of federal securities laws. On May 9, 2017, Yelp announced its first quarter 2017 results, which included revenue below analyst expectations, prompting the Company to reduce its revenue outlook for the year. When this news was announced, Yelp's stock price dropped sharply. If you suffered a loss in Yelp and wish to obtain additional information, please contact Joseph Klein, Esq. by telephone at 212-616-4899 or visit http://www.kkclasslaw.com/YELP-Info-Request-Form-251. Joseph Klein, Esq. represents investors and participates in securities litigations involving financial fraud throughout the nation. Attorney advertising. Prior results do not guarantee similar outcomes.