From Saban Brands press release page:
February 15, 2018 – After a successful 25-year partnership building the iconic action franchise, Power Rangers, Saban Brands and Bandai have mutually agreed not to renew their global Power Rangers master toy license agreement, effective April 2019. Bandai will continue to support Power Rangers, including the 2018 commemoration of the Power Rangers 25th anniversary and the current season, Super Ninja Steel. In addition, Bandai, through its partnership with Toei Company Ltd., will continue to exploit toy rights for the Super Sentai series, which has enjoyed over 40 years of success, in Japan and select other Asian territories.
UPDATE: Hasbro is the new Master Toy License holder for Power Rangers