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The index rose 0.5 per cent - or 21.88 points - to 4,465.50 at 09:12 BST on the back of gains by Morrisons, Tesco and Sainsbury's, Reuters reports.
Morrison shares rose by over seven per cent on the news that it expects to beat previous estimates with its full-year results, while Tesco and Sainsbury's climbed by 1.8 per cent and 2.1 per cent respectively.
There were also rises for mining firms, with Rio Tinto, Anglo American, Lonmin, BHP Billiton and Kazakhmys all climbing, despite metal prices becoming weaker.
However, there were falls for many retailers - including Next and Kingfisher - while Friends Provident dropped after rejecting another proposed buyout from Resolution.
The FTSE 100 has seen steady climbs of late and on Friday recorded its strongest weekly performance since January.
