The Changing Role of Foreign Investors in Tokyo Stock Price Formation

40 Pages Posted: 23 Feb 2021

See all articles by Kentaro Iwatsubo

Kentaro Iwatsubo

Kobe University

Clinton Watkins

Akita International University

Date Written: February 18, 2021


Recent research suggests that foreign investors improve the informational efficiency of national
stock markets. We examine how foreign investors contribute to efficiency. We model the influence
of domestic and foreign investors’ trades on the efficient price of Japanese stocks over 39 years. Our results show that foreign investors trade at an information advantage over domestic investors, and this advantage has increased since around 2000. We find this is due to a substantial increase in the importance of global stock price and exchange rate information in stock price formation. Our results suggest that foreign investors have made more use of global information in trading Japanese equities as the influence of international financial factors on the domestic market has increased over recent decades.

Keywords: Efficiency, Equities, Foreign investors, Information content of trade, Investor behavior, Market microstructure

JEL Classification: C32, G14, G15

Suggested Citation

Iwatsubo, Kentaro and Watkins, Clinton, The Changing Role of Foreign Investors in Tokyo Stock Price Formation (February 18, 2021). Available at SSRN: or

Kentaro Iwatsubo (Contact Author)

Kobe University ( email )

2-1, Rokkodai-cho, Nada-ku
Kobe, 657-8501, 657-8501

Clinton Watkins

Akita International University ( email )

193-2 Okutsubakidai, Yuwa-Tsubakigawa
Akita, Akita 010-1211


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