MEMX LLC

Stories

US exchanges rewrite Level 3 halt rule to keep 4 a.m. restart

Filed the first Level 3 resumption change on September 11, 2026

Seventeen US stock exchanges have filed rule changes to keep a 4:00 a.m. Eastern restart after a 20% market decline. The latest was Investors Exchange, which filed with the Securities and Exchange Commission on November 4.

Updated 4 days ago

NYSE proposes extending clearly erroneous trade protections to overnight trading

Rule Changes

Amended Rule 11.15 to extend clearly erroneous protections to overnight hours; effective immediately

Five exchanges have filed rules to stop overnight trades from being canceled as clearly erroneous, ahead of the industry's planned switch to 23-hour trading on December 6. NYSE American, Cboe BZX, MEMX and MX2 each filed versions of the change, and NYSE followed its September proposal with a wider rewrite of Rule 7.10 on October 8.

Updated Oct 30