Bloomberg reports Forced Margin Selling Seen Exacerbating Japan Market Rout

The swift downturn in the Japanese stock market likely triggered a massive wave of forced selling among retail investors, deepening the rout.

The Topix index plunged more than 7% with companies such as Mitsubishi Heavy Industries and Sumitomo Mitsui Financial diving more than 15%. The scale of selloff is such that some market players think individual investors are now being forced to dump stocks they had bought on margin.

Retail investors' margin buying position rose to a 18-year high in late July even as the Nikkei slipped from its historic peak. Investors who have bought stocks using credit are often forced to close their positions when stock prices fall more than expected, unless they have enough extra cash for collateral to deploy.