Feb 5 (Reuters) - Janus Henderson Group PLC JHG.N :
* Q4 2018 DILUTED EPS OF US$0.54, OR US$0.59 ON AN ADJUSTED BASIS
* QTRLY GAAP REVENUE $545.1 MILLION VERSUS $621.8 MILLION
* BOARD DECLARED A Q4 DIVIDEND OF $0.36 PER SHARE
* GROUP INTENDS TO SPEND UP TO $200 MILLION TO BUY ITS ORDINARY SHARES ON NYSE AND ITS CDIS ON ASX OVER 12 MONTHS
* AS AT 31 DEC 2018 AUM $328.5 BILLION