Hundreds of thousands of retail investors in Japan are women and they do it from home. Day trading became popular among Japanese housewives in the 1990s.
So, with Britain’s future up in the air, why are so many of these investors holding on to so much pound sterling?
Shihoko Goto, senior Northeast Asia associate at the Woodrow Wilson Center's Asia Program, said many Japanese were buying the pound because it's one of the few markets Japanese currency markets investors can readily access.
"The Japanese really don’t have a lot of places to park their money," she said.