Airtel Money, the African mobile payments business, begins conditional dealings on the London Stock Exchange's Main Market at 8 am on Friday under the ticker AMC.
Conditional dealings are early trading in the shares before formal admission, open only to investors who were allocated stock in the offer.
The shares were priced at £1.96, valuing the company at £5.3 billion (about $7 billion).
The offer is a sale of existing shares by minority shareholders, so the company itself raises no new money.
It comprises 270 million shares, with up to a further 27 million made available by Mastercard Asia/Pacific, the card network's regional arm.
If the over-allotment option is exercised in full, the offer will be worth £582 million, about 11% of the company's share capital at admission.
The International Finance Corporation, the World Bank's private sector arm, has been allocated around 34.3 million shares worth £67.2 million, its full commitment as a cornerstone investor.
UK retail investors were included through Retail Book, a platform that connects them with brokers and investment platforms.
They were allocated 8 million of the 270 million shares sold.
The company expects unconditional dealings and formal admission to the Official List on 14 October.
Ian Ferrao, Airtel Money's chief executive, said: "We see this listing as a beginning, not a destination."
