The Sainsbury family would consider selling their 36 per cent stake in the supermarket chain for 400p a share, according to sources close to the company. The figure represents a 50 per cent premium to Sainsbury's current share price of 267p and would be a huge financial undertaking for the two consortiums currently considering bids. At 400p a share, Sainsbury would be valued at £6.6bn. The family believes that its selling price is so high that no venture capitalist group could make the numbers work.