 LONDON--BUSINESS WIRE--Janus Henderson Group plc NYSEASX: JHG; JHG, the Group published its fourth quarter and full-year 2020 results for the period ended 31 December 2020. Fourth Quarter 2020 Results Fourth quarter 2020 operating income was US227.0 million compared to US156.5 million in the third quarter 2020 and US154.3 million in the fourth quarter 2019. Adjusted operating income, adjusted for one-time, acquisition and transaction related costs, was US231.7 million in the fourth 