ELMSFORD, N.Y.--(BUSINESS WIRE)--Party City Holdco Inc. ("the Company" or "Party City") (NYSE:PRTY) today announced financial results for the quarter ended June 30, 2015. “Our overall business had a strong first half of 2015 and we’re on track to deliver on our goals this year,” said James M. Harrison, Chief Executive Officer. “In our retail business, we saw lighter traffic in the second quarter primarily due to the Easter shift into the first quarter, but our year-to-date brand comp totaled 3.