Notice of Designation of a Longer Period for Commission Action on Proceedings To Determine Whether To Approve or Disapprove a Proposed Rule Change, as Modified by Amendments No. 1 and 2, Allowing the Exchange To Trade, Pursuant to Unlisted Trading Privileges, Any NMS Stock Listed on Another National Securities Exchange; Establishing Rules for the Trading Pursuant to UTP of Exchange-Traded Products; and Adopting New Equity Trading Rules Relating to Trading Halts of Securities Traded Pursuant to UTP on the Pillar Platform