BUZZ-Australia's Guzman Y Gomez gains most in over a month on US exit
** Guzman Y Gomez GYG.AX stock rise as much as 19.1% to A$21.54, on track for biggest intraday pct gain since April 7
** Stock touches highest level since April 23
** Mexican-themed fast-food chain says it has decided to exit US market, cease trading its restaurants in Chicago
** "Business is unlikely to deliver the performance that would justify continued investment of shareholder capital" - Steven Marks, founder and Co-CEO of GYG
** Expects to recognise one-off impact of between $30 million-$40 million in FY results
** Adds, one-off costs not expected to affect FY26 final dividend
** YTD, stock down 2.5%
