Tesco reported a "strong" performance in its financial third quarter in the UK and Republic of Ireland, unveiling its highest rate of market share growth in the latter in five years.
In the 19 weeks to 6 January the supermarket chain announced a 2.3% rise in like-for-like sales in the UK and Ireland.
During the Christmas trading period, Tesco said it had its “biggest ever” sales week in the UK, driven by the outperformance of fresh food sales - up nearly 4%.
Also during Christmas week, the company handled 58 million customer transactions and 770,000 online grocery deliveries.
Internationally, the company saw like-for-like sales growth of 0.8% across central Europe, but Asia's 9.6% decrease was due to unprofitable selling activities in Thailand and reduced promotional activity, the company said.
Dave Lewis, chief executive of Tesco (left), said: "We have continued to outperform the market throughout this period, particularly in fresh food, thanks to our most competitive offer for many years.
"Our trading momentum accelerated across the third quarter and into December, with the four weeks leading up to Christmas Day delivering record sales and volumes in the UK.
"We are confident in the outlook for the full year and are firmly on track to deliver our medium-term ambitions."
Nevertheless, investors were unimpressed by the trading statement and sold down Tesco shares by 4% to 203.75p in opening trade on the London Stock Exchange.