Stock Data Systems Get Extra Hours of Operation
Published Date: 4/22/2026
Notice
Summary
The folks who run stock market data plans want to keep their computer systems working longer each day. This change means the Processor will operate for more hours, helping traders get info outside regular market times. No extra costs were flagged, and the SEC is now deciding if this extended schedule is a good idea.
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Analyzed Economic Effects
3 provisions identified: 1 benefits, 1 costs, 1 mixed.
Trading Data Available Nearly 24/7
The Processor would receive and send quotation and last-sale information from 9:00 p.m. Eastern Time on Sunday to 8:00 p.m. ET on Friday, with a daily pause from 8:00 p.m. to 9:00 p.m. ET Monday through Thursday and holiday exceptions. The amendment also sets a trade date as the period between 8:00 p.m. ET the day before Regular Trading Hours and 8:00 p.m. ET on the day Regular Trading Hours begin, and the Participants expect to implement the changes on December 6, 2026, subject to market conditions.
Users Bear Development and Operating Costs
Only Participants that elect to use the extended hours must pay the additional development and operating costs to support the extended schedule. Any Participant that begins using the extended hours later must pay a proportionate share of previously incurred development costs and contribute to operating costs from the time it begins using the extended hours, while previously-incurred operating costs will not be reapportioned.
How Extended-Hours Trades Are Counted
Transactions reported outside 9:30 a.m. ET–4:00 p.m. ET will be designated with a ".T" and will be included in total trade volume for calculating net distributable operating revenue, but those trades will not be included in the calculation of the daily high, low, or last sale. Also, Quote Credits may be earned only for quotations transmitted during Regular Trading Hours.
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