** Shares of investment manager Impax Asset Management Group
IPX.L fall 17% to 272p; among top losers across all London
stocks
** Co says St. James's Place SJP.L to terminate IPX's
mandate to manage the Sustainable & Responsible Equity Fund
** Adds, the mandate is the only one that IPX has with SJP
and totalled about 5.2 bln pounds ($6.57 bln) of assets under
management as of Nov. 30
** IPX sees impact on its revenue from termination to be
about 12.7 mln pounds on an annualized basis
** As of last close, stock down 40.5% YTD
($1 = 0.7919 pounds)
(Reporting by DhanushVignesh Babu in Bengaluru)
((DhanushVignesh.Babu@thomsonreuters.com;))