Joint Industry Plan; Notice of Filing of the Twenty-Seventh Amendment to the National Market System Plan To Address Extraordinary Market Volatility To Establish Temporary Price Band Protections in Overnight Trading

ION [Release No. 34-105596; File No. 4-631] Joint Industry Plan; Notice of Filing of the Twenty-Seventh Amendment to the National Market System Plan To Address Extraordinary Market Volatility To Establish Temporary Price Band Protections in Overnight Trading June 1, 2026. I. Introduction On May 27, 2026, Nasdaq, Inc., on behalf of Nasdaq Texas LLC (``NDTX''), Nasdaq PHLX LLC (``PHLX''), and The Nasdaq Stock Market LLC (``Nasdaq''), and the following parties to the Plan to Address Extraordinary Market Volatility (``Plan'') Pursuant to Rule 608 of Regulation NMS under the Securities Exchange Act of 1934 (``Act'' or ``Exchange Act'') \1\: 24X National [[Page 33775]] Exchange LLC, Cboe BZX Exchange, Inc., Cboe BYX Exchange, Inc., Cboe EDGA Exchange, Inc., Cboe EDGX Exchange, Inc., Financial Industry Regulatory Authority, Inc., Investors Exchange LLC, Long-Term Stock Exchange, Inc., MEMX LLC, MIAX PEARL, LLC, New York Stock Exchange LLC, NYSE American LLC, NYSE Arca, Inc., NYSE Texas, Inc., and NYSE National, Inc., (collectively with NDTX, PHLX, and Nasdaq, ``Participants''), filed with the Securities and Exchange Commission (``Commission'') pursuant to Section 11A(a)(3) of the Exchange Act \2\ and Rule 608 thereunder,\3\ a proposal to amend the Plan (``Twenty- Seventh Amendment'').\4\ The proposal reflects changes unanimously approved by the Participants. The Twenty-Seventh Amendme