Tesco, which reported a strong financial performance last week, continues to see a rise in year-on-year market share according to our TradeTrak data from ACNielsen.

The retailer, which announced annual pre-tax profits up 13% to £1.36bn and UK like-for-like sales growth of 4.1%,has seen market share grow by 0.3% over the past 12 months.

Tesco’s year-on-year rise is mirrored by that of Morrisons, also up 0.3%, while Asda has produced the greatest increase of the multiples, up 0.4%.

In contrast beleaguered Safeway’s market share has dropped 0.7% year-on-year, according to the data. In a trading statement released last Tuesday the company, the subject of a five-way bidding battle, blamed the “uncertain environment” caused by the auction for a 0.1% drop in like-for-like sales in the fourth quarter. According to the statement Safeway’s results for the second half and year as a whole have been affected by this uncertainty, despite the continuing support of suppliers concerned about the future ownership of the company.

Full-year pre-tax profits are forecast to be £335m.

Sainsbury continues to see the largest year-on-year drop in market share of the multiples, down by 0.9%.

Meanwhile Somerfield was the subject of bid activity this week, with its announcement that it had received a proposal relating to a possible offer for the group last Friday.

The announcement follows a high level of trading in Somerfield shares with more than 40 million shares traded in three trading days.

According to the TradeTrak data, the UK’s sixth largest retailer is down by 0.3% in year-on-year market share.