PENNEYS – PRIMARK is an Irish clothing retailer, operating in Austria, Belgium, Germany, Ireland (38 stores branded as Penneys), Portugal, Spain, the Netherlands and the United Kingdom. The company’s main headquarters are in Dublin; they are a subsidiary of British food processing company ABF. Primark first opened in June 1969 in Mary Street (Dublin). It became apparent that more stores were required and another four were added to the chain.
Further expansion and success in Ireland dictated the move to the United Kingdom, when in 1971 it opened a large store in Belfast City Centre before opening four out of town stores in England in 1973. The first high-street stores were Derby and Bristol.
Info gleaned from Wikipedia