Abstract
We examine changes in market liquidity around the triggering of US equity market-wide circuit breakers (MWCBs). The coronavirus pandemic has led to heightened market volatility and the tripping of four MWCBs in 2020. When the market reopens following a MWCB halt, trading demand (volume) surges. The rise in trading coincides with shifts in trading activity across exchanges and dark markets, and the cost of trading rises significantly. Although the market is less liquid immediately after a halt, conditions steadily improve over time and converge to similar levels on days in which the MWCB does not trip.
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