Together Sainsbury's and Asda would have a market share of 31.4%
Tesco, Sainsbury's, Asda and Morrisons have all lost market share over the past decade as Aldi, Lidl and Waitrose have made gains
March 2018
March 2008
0
5
10
15
20
25
30
Tesco 27.6% (2018)
Sainsbury's 15.8
Asda 15.6
Morrisons 10.4
Aldi 7.3
Co-op 6.0
Lidl 5.3
Waitrose 5.0
Iceland 2.1
Sainsbury's & Asda 31.4