** Shares of Johnson Service Group JSG.L up 15.5% at 159.8p, on track to record biggest single-day pct gain since November 2020
** Stock highest pct gainer across the London Stock Exchange
** Textile rental service provider says it is confident of reporting FY adjusted operating profit in line with current market expectations
** Reports H1 2025 adjusted PBT of £24.9 million ($33.64 million), up 15.8% from a year ago
** Company plans further share buyback program that could return about £25 million to shareholders
** Including session's gains, JSG shares are up over 18% YTD
($1 = 0.7402 pounds)
(Reporting by Atharva Singh in Bengaluru)
((Atharva.singh@thomsonreuters.com))