** Shares of Airtel Africa AAF.L jump as much as 10.7% to a record high of 255.20p
** Stock is the top gainer on FTSE 100 index .FTSE, which is up 0.05%
** H1 revenue rises 25.8% YoY to $2.98 bln, driven by tariff adjustments in Nigeria and strong growth in Francophone Africa
** HY adj EBITDA up 33.2% YoY to $1.45 bln, driven by continued ops momentum and sustained benefits from cost efficiency
programme
** Co declares interim dividend of 2.84 cents per share, a 9.2% increase
** YTD, including session's moves, the stock has risen ~103% vs 18.16% in FTSE 100
(Reporting by Krisha Bhatt)
((Krisha.Bhatt@thomsonreuters.com))