** Shares of Greggs GRG.L, Britain's biggest fast-food chain, rise 7% to 1,628 pence
** Stock is top pct gainer on FTSE mid-cap index .FTMC, which is down 0.9%
** Greggs reports like-for-like sales at company-managed shops rose 3.3% in the latest 10 weeks
** Total sales in the 19-week period ended May 9 were up 7.5% to 800 million pounds ($1.08 billion)
** GRG keeps full-year outlook unchanged, expects cost inflation of about 3% on a like-for-like basis this year, but warns prolonged Middle East conflict could push up costs through end-2026 and into 2027
** Including session's moves, stock down 3.3% YTD, while FTMC gains 0.7%
($1 = 0.7388 pounds)
(Reporting by DhanushVignesh Babu in Bengaluru)
((DhanushVignesh.Babu@thomsonreuters.com))