Cboe is set to introduce separate Fat Finger Protection limits for regular and extended-hours trading across its U.S. equities exchanges, giving market participants greater flexibility in managing order-entry risk.
The change, scheduled to take effect on October 26, 2026, will allow customers to configure different protection thresholds for Regular Trading Hours and non-Regular Trading Hours.
Fat Finger Protection is designed to prevent orders from being entered at prices that are significantly away from the prevailing market. When an order exceeds the configured threshold, it can be rejected before reaching the market.
The new setup is particularly relevant for extended-hours trading, where liquidity is often thinner and price movements can be more pronounced than during the main U.S. trading session.
By allowing separate settings for different trading periods, firms will be able to apply tighter or more flexible controls depending on market conditions and their own execution strategies.
The move forms part of Cboe’s broader risk-management framework for U.S. equities and reflects the growing focus on order controls as trading activity continues to expand beyond traditional market hours.
For brokers, institutional firms and other market participants, the change could provide more tailored protection against accidental order-entry errors while maintaining flexibility during periods of lower liquidity.
The update highlights the increasing importance of automated risk controls in modern electronic markets, particularly as extended-hours trading becomes a larger part of the overall trading environment.
