The continued volatility on Wall Street and other bourses overseas prompted foreign investors to unwind their Japanese portfolios last month.

Nonresident investors sold 846.27 billion yen more than they bought on the Tokyo, Osaka and Nagoya stock exchanges, the largest net sales since the 1.03 trillion yen set in February 1990, according to a monthly industry report.

The figure came in a turnaround from net purchases of 213.65 billion yen in March.