Strategic Trading As a Response to Short Sellers

53 Pages Posted: 5 Apr 2019 Last revised: 27 Jan 2020

See all articles by Marco Di Maggio

Marco Di Maggio

Harvard Business School; National Bureau of Economic Research (NBER)

Francesco A. Franzoni

USI Lugano; Swiss Finance Institute; Centre for Economic Policy Research (CEPR)

Massimo Massa

INSEAD - Finance

Roberto Tubaldi

USI Lugano; Swiss Finance Institute

Multiple version iconThere are 2 versions of this paper

Date Written: January 17, 2020


We study empirically whether informed traders’ reaction to the presence of short sellers affects price discovery. We find a sizeable reduction of positive information impounding before earnings announcements for stocks more exposed to exogenous variation in the threat of short selling. Consistent with strategic behavior by informed investors, we show that investors with positive views on a stock slow down their trades when short sellers are present in the same stock. Furthermore, they break up their buy trades across multiple brokers, suggesting that they wish to prevent their information from leaking. The findings suggest that short selling can deter information impounding when information is spread across several investors.

Keywords: Short selling, Informed trading, Strategic traders, Institutional investors, Market efficiency

JEL Classification: G12, G14, G23

Suggested Citation

Di Maggio, Marco and Franzoni, Francesco A. and Massa, Massimo and Tubaldi, Roberto, Strategic Trading As a Response to Short Sellers (January 17, 2020). Swiss Finance Institute Research Paper No. 19-23. Available at SSRN: or

Marco Di Maggio

Harvard Business School ( email )

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National Bureau of Economic Research (NBER) ( email )

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Francesco A. Franzoni (Contact Author)

USI Lugano ( email )

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Massimo Massa

INSEAD - Finance ( email )

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Roberto Tubaldi

USI Lugano ( email )


Swiss Finance Institute ( email )

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