Irish consumers spent €77m more over the final 12 weeks of 2015 than in the same period the previous year according to new figures from market research firm Kantar Worldpanel.
Its latest grocery market share figures suggest the top five supermarket groups in the country all experienced a rise in sales over the key Christmas period.
Supervalu remains the number one position with a market share of just over 25%. Supervalu's sales grew by 4.3% over the final three months of the year.
Tesco, Dunnes Stores, Aldi and Lidl all saw their sales rise too, according to the Kantar Worldpanel Data.
Lidl experienced the strongest sales growth, of 11.6%, compared to Christmas 2014.
The Kantar Worldpanel figures indicate grocery sales during the quarter were 3.5% higher year-on-year. It says this is the fastest rate of growth the sector has seen since January 2009.