** Insurance broker WTW's WTW.O shares rise 2.4% to $339.64
** WTW late Thursday announced a $1.5 billion increase to its existing share repurchase program
** Move adds to the nearly $200 million remaining on the current open-ended repurchase authority
** WTW authorized to repurchase shares by way of redemption or otherwise
** 14 of 22 brokerages rate the stock "buy" or higher, 7 "hold" and 1 "sell"; median PT $369 - data compiled by LSEG
** As of last close, WTW shares up 6% YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))