Ken Griffin, CEO and founder of Citadel, believes now is "an exciting time to be involved in Japan" due to structural shifts in the domestic market over the last decade, which is just as well, given that his firm is preparing to reopen an office in Tokyo as early as this year, according to a report by Nikkei Asia.

Citadel closed its last office in Tokyo in 2008, as part of its restructuring in the aftermath of the collapse of Lehman Brothers, but it continued to invest in Japanese shares from overseas. 

In an interview with Nikkei Asia, Griffin said that the company is now looking to tap new investment opportunities stemming from a shift by Japanese companies to "being much more focused on generating success for their shareholders and growing their businesses globally". 

The firm is reportedly considering hiring asset managers focusing on Japanese equities at its new Tokyo office.