Prior to being acquired by Walmart before 2000 , Asda was listed on the London Stock Exchange .
It was listed on the London Stock Exchange until 1999 when it was acquired by the American retail giant Walmart for £6.7 billion , and was the second-largest supermarket chain in Britain between 2003 and 2014 by market share , and is currently third behind Tesco and Sainsbury 's .
Asda