Nasdaq Smooths Out Stock Trade Blunders in Overnight Hours
Published Date: 10/13/2026
Notice
Summary
Nasdaq is updating its rules about fixing clearly wrong stock trades to match new 23-hour, 5-day trading hours. This change helps keep trading fair and smooth during extended hours, affecting traders and investors using Nasdaq. The new rule is effective immediately, so everyone should be ready for quicker fixes on mistakes during these longer trading sessions.
Analyzed Economic Effects
3 provisions identified: 3 benefits, 0 costs, 0 mixed.
No CEE Breaks During Overnight Price Bands
If a trade on Nasdaq executes during the LULD Protected Hours (which now include Regular Market Hours and Overnight Protected Hours from 9:00 p.m. ET through 4:00 a.m. ET), and the trade price is within the applicable LULD Price Bands, that trade generally will not be reviewable as a "clearly erroneous" transaction. This extension to Overnight Protected Hours will take effect at the start of industry-wide 23/5 Trading on December 6, 2026.
Overnight Price-Change Thresholds Apply
For clearly erroneous review during Overnight Protected Hours, Nasdaq will apply the applicable Percentage Parameter (the Overnight Percentage Parameter defined in the LULD Plan) when determining whether a trade's price deviates enough from the Reference Price to be eligible for review. The rule ties clearly erroneous price threshold treatment to the Overnight Percentage Parameter during the overnight period.
Rights and Warrants Still Eligible for CEE Overnight
Transactions in NMS stocks that are not subject to the LULD Plan (for example, rights and warrants) will remain eligible for clearly erroneous review if executed during Overnight Protected Hours, and such reviews will use the Numerical Guidelines that apply outside Regular Market Hours. This extends the existing post-market/pre-market treatment to the overnight protected period.
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