Fortune reports that parent company Walgreens Boots Alliance (the company operates under the Boots brand in Europe) made the announcement in order to address anti-trust concerns from regulators. Rather than buy Rite Aid's entire inventory of 4,500 stores, Walgreens announced in June that they would instead purchase only about half of those, 2,200, for $5 billion, and as of this week, that number came down to 1,932 stores for $4.375 billion, 600 of which will be closed.