Sainsbury’s led an increased level of promotional activity in the UK grocery sector last month, according to the latest data from the just-food Promo Tracker.

Four out of the six retailers monitored by the Tracker – Tesco, Asda, Ocado and Sainsbury’s – had a higher percentage of their SKUs on offer in May than in April, the figures showed.

However, the Tracker, compiled exclusively for just-food by mysupermarket-insights.co.uk, showed the biggest month-on-month increase was at Sainsbury’s. In April, 35.2% of its SKUs were on promotion; in May, that went up to 39%.

The average saving per promotion increased at Sainsbury’s, Tesco and Ocado, although at Asda it fell when compared to the levels the Tracker reported for April.

Waitrose ran less promotions as a proportion of the SKUs it offered month-on-month, although the average saving increased in May compared to a month earlier.

Frozen pizza and bread broke into the top five most-promoted categories.

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PepsiCo’s Snack-a-Jacks, General Mills’ ice cream Haagen-Dazs and Waitrose’s private-label convenience food range Good To Go moved into the top ten most-promoted brands in May.

Supermarket Total number of SKUs Number of Promos % of all SKUs on promo Average saving per promo
Tesco 35050 14168 40.42 £1.01
Asda 28979 6148 21.22 £0.52
Sainsbury’s 25141 9806 39 £1.13
Ocado 21092 7608 36.07 £1.41
Waitrose 22745 6453 28.37 £1.15
Morrisons 11298 4962 43.92  £0.47
Category PcntOfPromos AvgSavingPerPromo
Yoghurt & Milk Drinks 66.3 £0.49
Frozen Vegetarian 58.8 £0.52
Crisps 57.46 £0.55
Yogurts 55.8 £0.33
Frozen Pizza & Breads 54.39 £0.58
Baby Food & Snacks 54.2 £0.2
Chilled Desserts 52.64 £0.3
Cooked, Prepared Meat & Poultry 49.3 £0.68
Snack Meals 44.47 £0.29
Ice Cream 43.3 £0.98
Pasta Sauce 42.04 £0.54
Tinned Pasta 40.63 £0.25
Cereal Bars 40.42 £0.6
Fresh Vegetarian Food 39.78 £0.66
Fresh Pasta & Pasta Sauce 39.65 £0.49
Cheese Snacks 39.15 £0.57
Sausages & Burgers 39.05 £0.52
Frozen Ready Meals 38.56 £0.52
Fruit 37.78 £0.65
Fresh Pizza & Chilled Bread 37.68 £0.77
Brand PcntOfPromos AvgSavingPerPromo
Reflets de France 98 £0.4
Daylesford 95.1 £1.42
Benecol 89.1 £0.58
Actimel 87.8 £0.66
Activia 87 £0.26
Muller 86.4 £0.39
Snack-a-Jacks 84.5 £0.32
Häagen-Dazs 75.3 £1.46
Tilda 75.1 £0.69
Waitrose Good to Go 73.5 £0.52
Tesco Italian 72.5 £0.49
Tyrrells 71.1 £0.53
Rachel’s 70 £0.3
Walkers (Crisps, Snacks & Dips) 69.9 £0.52
Batchelors 69.8 £0.21
Robinsons 68.9 £0.72
Ben & Jerry’s 68.6 £1.27
Alpen 67.6 £0.42
Bassett’s 66.3 £1.15
Green & Black’s 66.2 £0.69