The grocery market grew by 2% in the past three months, according to new figures from Kantar Worldpanel, with Supervalu, Aldi and Lidl the biggest winners during the period.
Supervalu attracted an additional 87,000 shoppers in the 12 weeks to 22 June, representing a 1.3% rise in the amount of consumer spend it attracted compared to the same period of last year.
Its overall market share was largely stable, however, at 24.8%.
Meanwhile discount retailers Aldi and Lidl saw consumer spend increase by 19.5% and 12.4% respectively when compared to last year.
Lidl now has an overall market share of 8.2%, with Aldi close behind at 8.1%.
Tesco remains the biggest operator in the Irish grocery market, however its share has continued to decline in recent months.
Its take of consumer spend fell 3.4% during the quarter, with its overall market share now standing at 26.1%.
Dunnes Stores, meanwhile, saw a 0.5% rise in spend, with its market share standing at 21.1%.
According to Kantar, retailers are beginning to see customers spend more, while footfall is also increasing.
Discounters Aldi and Lidl have been successful in getting shoppers to spend more on each trip, it said, which is what bigger players like Tesco and Dunnes Stores need to do in order to arrest their market share declines.