The value retailer is set to formally enter the FTSE 100 on September 21 after its market close value on Tuesday of £4.75bn put it comfortably above the threshold required to enter the ranking.

Index manager FTSE Russell has confirmed that B&M will be the only company to be promoted in the quarterly reshuffle, while ITV will be the only relegation between the FTSE 100 and FTSE 250 indexes respectively.