Marc S. Gerber is a Partner and Caroline S. Kim is a Counsel at Skadden, Arps, Slate, Meagher & Flom LLP. This post is based on a Skadden memorandum by Mr. Gerber, Ms. Kim, Brian V. Breheny, Raquel Fox, Andrew J. Brady and Nicholas D. Lamparski, all at Skadden.
Executive Summary
- What’s new: Beginning December 6, 2026, both the Nasdaq Stock Market and NYSE Arca are expected to extend trading hours to 23 hours per day, five days per week (23×5 trading).
- Why it matters: The 23×5 trading expansion would add an overnight session from Sunday through Thursday from 9 p.m. to 4 a.m. ET, with a mandatory one-hour trading pause Monday through Thursday evening between 8 p.m. and 9 p.m. ET.
- What to do next: Companies should consider the potential impacts on corporate policies and transaction documents that reference exchange-defined trading sessions and monitor disclosure practices in light of 23×5 trading.

