** Shares in Ahold Delhaize AD.AS are up around 2% after the supermarket group posted third-quarter core profit beat and announced a new 1 billion euro buyback
** Quarterly underlying operating income was 933 million euros ($1.09 billion), above an estimate of 866 million in company-compiled consensus
** "The strong underlying EBIT performance was predominantly driven by a very strong margin improvement of 40bps to 4.6% in the US," analysts at KBC Securities say
** They add that while the company was partially helped by one-off impact, the U.S. business would have still come ahead of expectations even without this effect
** Up to the previous session's close, shares were up 13% YTD
($1 = 0.8575 euros)
(Reporting by Mateusz Rabiega)
((Mateusz.rabiega@thomsonreuters.com))