Tesco and SuperValu are neck-and-neck in the race to be Ireland's biggest grocery retailer.
New figures show that Tesco controls just 0.3pc more of the market than SuperValu, with Dunnes still in third spot as it spends tens of millions of euro to lure shoppers by offering money-off vouchers.
Data from research group Kantar Worldpanel shows that Tesco's market share slipped 2.1pc to 25.2pc in the 12 weeks to February 1.
SuperValu's share edged just slightly higher to 24.9pc.
Dunnes gained 1.7pc in the latest period.