SAN FRANCISCO--(BUSINESS WIRE)--Gap Inc. (NYSE:GPS) today reported that net sales for the four-week period ended January 31, 2015 were $888 million compared with net sales of $899 million for the four-week period ended February 1, 2014. For the fourth quarter of fiscal year 2014, Gap Inc.’s net sales increased 3 percent to $4.71 billion compared with $4.58 billion for the fourth quarter last year. On a constant currency basis, Gap Inc. net sales increased 5 percent for the fourth quarter of fis