Tesco continues to hold the biggest share of the grocery market here, new figures show.
But Aldi posted market share growth of almost 30% in the 12 weeks to the end of September.
The figures from Kantar Worldpanel shows that Tesco's market share stood at 28.6% in the 12 weeks to September, up 2.5% on the same time last year.
They show that the discounters continue to make an impact on the grocery market with Aldi seeing a 29.8% gain to stand at 6% while Lidl rose by 1% to stand at 6.6%.
During the period under review, Dunnes saw its market share drop by 7.8% to 21.6% while Supervalu inched 1% higher to 19.7% and Superquinn fell 4.3% to 5.5%.
Kantar Worldpanel said that shoppers are continuing to keep a close eye on their spending - an austerity trend which had led to the value of the Irish grocery market falling by 0.5%.
This trend is further demonstrated by consumers choosing to shop more often for fewer items, rather than doing the big weekly shop.
''While the grocery market as a whole remains subdued, there are still some areas that are performing well,,'' commented David Berry, Kantar Worldpanel's commercial director. He noted that sales of alcohol at the grocers have grown by 8% this quarter.