Food retail boss Bill Laird said the growth - ahead of the Co-operative Group at 4%, Budgens at 3.6%, and United Co-operatives at 4% - was driven by investing in refits, a greater emphasis on fresh and a good summer.
Two thirds of the 85-strong estate has now been refurbished.
The 30 Alldays stores the society will acquire from the Co-operative Group would come on stream at a rate of about three a week, said Laird, with the transfer complete by Christmas. “Full refurbishments should be completed by early summer in tandem with our refurbishment programme.”
A handful of new-build stores are also in the pipeline, taking the society’s tally to around 120 food retail stores by next spring, he added.
Group profit rose 20% to £4.3m on sales up 10.3% to £167.3m for the six months to July 26.