The Co-op was the fastest growing non-discounter for the first time since 2011.
The Co-Op was the most frequently visited major supermarket during the quarter, with its customers shopping an average of almost 19 times over the past 12 weeks, compared with a market average of 11 visits.
The Manchester based mutual posted a strong quarter as revenues in its food business increased 1.4%, driven by a 7% increase in own-label sales and with its market share remaining consistent at 5.9%, according to Kantar Worldpanel.
It comes days after the Co-op revealed that it was acquiring 15 stores from convenience specialist Budgens in the London and Southeast. The retailer plans to purcahse 100 new stores in 2016 and further grow its market share, patrticularly in the fast-growing convenience sector.