By Jon Robinson Asda losing ground to rivals Tesco and Sainsbury’s since being taken over by the billionaire Issa brothers is “hugely embarrassing for the supermarket’s in-coming owner and “extremely frustrating” for staff, according to an analyst at AJ Bell. According to the latest available data from Kantar, the Leeds-headquartered chain‘s market share has fallen by one per cent to 13.4 per cent as of April 2024 since the £6.8bn takeover. Over the same period, the market share of both Tesco and Sainsbury’s have risen by 0.5 per cent and 0.4 per cent respectively. Dan Coatsworth, investment a…