HOUSTON--(BUSINESS WIRE)--Mattress Firm Holding Corp. (the “Company”) (NASDAQ:MFRM) today announced its financial results for the second fiscal quarter (13 weeks) ended August 4, 2015. Net sales for the second fiscal quarter increased 61.2% over the prior year to $661.1 million, reflecting comparable-store sales growth of 2.8% and incremental sales from new and acquired stores. The Company reported second fiscal quarter earnings per diluted share (“EPS”) on a generally accepted accounting princ