As Asda and Tesco slug it out over price, Sainsbury's has increased the number of promotions in featured space by 8.2% - to 2,116 offers in the four weeks to 17 April, according to Assosia - and is one of just two retailers to increase the number of deals in the period.
Year-on-year, offers increased by 19.1% way ahead of nearest rival Asda, which was up by 15.3%.
The typical average saving on an offer at Sainsbury's was £2.18, just behind Tesco, which offered the biggest average saving among the multiples at £2.31.
Analysts speculated that Sainsbury's was trying to increase footfall following a slowdown in sales since Christmas.
"In this tough economic climate it's important to make shopping easier on our customers' wallets," said a Sainsbury's spokesman.
"Our major Save 1/3 on all baby products promotion was particularly well received, as was our 3-for-2 on herbs & spices."
Clarke concedes ‘We must do better’ as Tesco falters in fourth quarter (19 April 2011)
Food inflation eases as high street suffers ‘worst month in 15 years’ (12 April 2011)
Bogofs get blame for £14bn food waste mountain (11 April 2011)
Inflation locked down by the Asda-Tesco price war (2 April 2011)