medium · Market Microstructure market-impact
A stock is subject to 'Limit Up-Limit Down' (LULD) rules with a 5% band.
If the reference price is $100.00, and a sudden buy imbalance pushes the bid to $105.00 with no asks below that price for 15 seconds, what is the regulatory result?
- All trades executed at $105.00 are automatically voided or 'broken' by the listing exchange.
- The stock enters a 'Limit State' and, if the condition persists, a 5-minute trading halt is triggered.
- A market-wide circuit breaker is immediately triggered, halting all trading for a full 15 minutes.
- The minimum tick size for the security is increased to $0.05 by the exchange to dampen further volatility.
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