Pros Holdings (NYSE: PRO) 17.5% LOWER; announced preliminary financial results for the first quarter ended March 31, 2015. Based on preliminary financial information, PROS currently expects to report total non-GAAP revenue for the first quarter of 2015 in the range of $44.3 million to $44.8 million, below the Companys guidance of $47.0 million to $49.0 million. Non-GAAP operating loss for the first quarter of 2015 is expected to be $3.1 million to $3.6 million, compared to guidance of non-GAAP operating loss of $1.0 million to $2.5 million. Non-GAAP loss per share for the first quarter of 2015 is expected