Broker and institutional investor short selling

Ben R. Marshall, Nhut H. Nguyen, Nuttawat Visaltanachoti and Jennifer Zhu

Accounting and Finance, 2025, vol. 65, issue 1, 621-645

Abstract: Brokers have access to order‐flow data, which they can use to enhance their short‐selling returns. However, New Zealand brokers also have a fiduciary duty to place their clients' interests before their own. We compare the short‐selling returns and trading behaviours of brokers and institutional investors who predominantly focus on profit‐making. Our results show no significant return difference between broker and institutional short sales and indicate that broker short sales are apparently to stabilise the market. Short selling is associated with improved market quality, and this improvement is more pronounced when brokers short sell more than institutional investors.

Date: 2025
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https://doi.org/10.1111/acfi.13339

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