Anonymous Trading in Equities
114 Pages Posted: 6 Sep 2015 Last revised: 29 May 2020
Date Written: May 26, 2020
I explore a reform at the Oslo Stock Exchange to assess the causal effect of post-trade trader anonymity on stock liquidity and trading volume. Using a regression discontinuity approach, I find that anonymity leads to a reduction in bid-ask spreads by 40% and an increase in trading volume by more than 50%. The increase in trading volume is mostly accounted for by increased trading activity by institutional investors, while retail investors do not adjust their trading behavior in response to anonymity. The results suggest positive effects of post-trade anonymity on standard measures of market quality.
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