These most recent figures show the big four grocery chains have continued to lose market share. Having bet the farm on big format out-of-town retail, Asda continues to lose ground fastest, though its decline has slowed a bit from dizzying rates. Owned by Walmart, Kantar reckons it has a 15.6% share. Tesco remains on top, with 27.5% of the grocery market. It previously topped 30%. The most recent figures suggest that several years of turmoil, plus an accounting fraud, may at last have bottomed out. The market leader has rebooted its mojo, with store re-design and simplification of its business, offloading foreign offshoots, Giraffe restaurants and, recently, its optician counters.