UK-based fashion retailer Primark will open three new US stores and expand an existing location in Boston as part of a plan to increase its presence in the United States and other international markets, The Wall Street Journal reports. Primark, known for its ultra-low-priced fast-fashion basics, has grown to five U.S. stores since opening the first last year and it aims to add 1.3 million square feet of global retail space in fiscal year 2017.