Expatriate staff at most foreign banks in Tokyo make up a small portion of the total, by some estimates less than 10 percent. But many are often in senior positions so their departure can have a significant impact.
And while Japan's investment banking market is famously tough, it's an essential place for large banks to be and can produce hefty fees.
"The foreign banker presence on the ground in Tokyo now is very thin and depending on how long it takes them to return there could be lasting implications of that," said one banker. "Every time there's a washout of foreigners in Japan they never quite return in the same numbers."
With bankers joining the growing exodus, private jet operators reported a surge in demand for evacuation flights which sent prices surging as much as a quarter. One jet operator said the cost of flying 14 people to Hong Kong from Tokyo was more than $160,000.
"I got a request yesterday to fly 14 people from Tokyo to Hong Kong, 5 hour 5 minutes trip. They did not care about price," said Jackie Wu, COO of Hong Kong Jet, a newly established private jet subsidiary of China's HNA Group. (read more)