** Shares of Australia's bourse operator ASX ASX.AX extend losses, falling as much as 2.5% to A$52.31
** Stock hits its lowest level since October 12, 2017
** Australia's main stock exchange operator to cut dividend payouts after country's corporate regulator slapped extra A$150 mln ($99.59 mln) capital charge on co on Monday
** ASX flagged that charge will impact underlying return on equity; downgraded medium-term target range to between 12.5%-14.0%
** Analysts at UBS downgrade price target to A$53/shr from A$62.15/shr; retain "sell" rating
** Brokerage says risks around reset in ASX's cost base into FY27 will likely overhang for next six months
** YTD, stock down 19.6%, including the day's moves
($1 = 1.5063 Australian dollars)
(Reporting by Shivangi Lahiri in Bengaluru)
((shivangi.lahiri@thomsonreuters.com))