The payments processor was bumped up in the quarterly review just a couple of months after floating in one of the most successful IPOs of 2015, claiming a market capitalisation of £5.28bn after its first day of trading.
Meanwhile, Morrisons made a shaky start on its first day trading in the FTSE 250, having been demoted after nearly 15 years in the FTSE 100. Shares are up 1.02 per cent, to 148.2p, having fallen as low as 145.3p on opening.
Irish business support services provider DCC, and Yorkshire-based financial services firm Provident Financial also had a modest start to their first day of trading on the FTSE 100 today. DCC's shares were up 1.45 per cent to 5,580p, and Provident's rose 1.54 per cent to 3,290p.
Meggitt, an aerospace engineering company, was demoted along with Morrisons, and its shares are up, just, to 363.77p, a 0.43 per cent rise. Security firm G4S, which was also pushed out of the blue chip index, saw shares up 0.23 per cent on its first day in the FTSE 250, at 218p.