Tesco chief executive Dave Lewis said the supermarket had endured a "very difficult year" as it reported the biggest annual loss in its 96-year-history.
The supermarket's massive losses came after an accounting scandal, a ferocious price war with rivals and a series of profit warnings - all of which followed a major write down on the value of its property portfolio.
"The results we have published today reflect a deterioration in the market and, more significantly, an erosion of our competitiveness over recent years.
"We have faced into this reality, sought to draw a line under the past and begun to rebuild, and already we are beginning to see early encouraging signs from what we’ve done so far."
Despite the heavy losses, Tesco saw a small increase in its UK like-for-like sales for the first time in more than four years during the final quarter.
Supermarket giant Tesco has reported a bottom-line loss of £6.38 billion for the year to February 28.
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Tesco is facing a multi-million pound compensation claim from shareholders over last year's accounts scandal.
The supermarket giant’s announcement in September that it materially overstated its profits caused a crash in its share value.
A non-profit organisation under the name Tesco Shareholders Claims Limited said:
A permanent destruction of value has occurred and had the accounting irregularities not taken place the share price, and value of the company, would today be materially higher.
TSC expects the claim to be in the region of 50p-70p per share. Tesco Plc has in excess of 8 billion shares listed.
Tesco has said it is "committed" to reducing the food poisoning bug campylobacter in poultry.
"Providing safe food is always our absolute priority," a Tesco spokesperson said.
"Whilst there is no simple solution to prevent its presence in raw poultry we have and will continue to work in close collaboration with our suppliers, scientists and relevant industry experts to make solid progress to tackle the problem at all stages of the supply chain."
Supermarket giant Tesco is going to axe up to 10,000 jobs in a major shake-up at the crisis-hit retailer, according to reports.
The UK's biggest supermarket is preparing to put 6,000 members of staff out of work from its head office, according to Sunday Telegraph.
The report comes after last month's announcement that it would be closing 43 of its stores, putting 2,000 people at risk of losing their jobs.
A spokesman for the supermarket declined to comment on the report.
Chief executive Dave Lewis is embarking on a major overhaul of Tesco stores after two successive years of falling profits and an accounting scandal.
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An official investigation is to be launched into practices at Tesco, including any delays in payments to suppliers.
The Groceries Code Adjudicator, Christine Tacon, announced the move, saying she had formed a "reasonable suspicion" that the retailer has breached the Groceries Supply Code of Practice.
She said she took the decision after considering information submitted to her relating to practices associated with the profit over-statement announced by Tesco last September.
The role of the Adjudicator was set up in 2013 to regulate the relationship between the 10 largest retailers and their suppliers.
The investigation, the first to be held, is expected to take up to nine months and the Adjudicator has called for evidence to be submitted by 3 April.
We have worked closely with the office of the Adjudicator since its creation to put in place strong compliance processes.
We have taken action to strengthen compliance and, as we have announced, we are changing the way we work with suppliers.
We will continue to co-operate fully with the GCA as she carries out her investigation and welcome the opportunity for our suppliers to provide direct feedback.
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