On February 15, 2017, the Chicago Board Options Exchange, Incorporated (“Exchange” or “CBOE”) filed with the Securities and Exchange Commission (“Commission”), pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934 (“Exchange Act”) ^[1] and Rule 19b-4 thereunder,^[2] a proposed rule change to amend its rules regarding the circumstances in which CBOE Floor Officials may declare a “fast” market and the actions those Floor Officials may take when a fast market is declared, including the ability to suspend the duty to systemize a non-electronic order prior to representing it in open outcry trading. The proposed rule change was published for comment in the Federal Register on March 6, 2017.^[3] On April 18, 2017, pursuant to Section 19(b)(2) of the Exchange Act,^[4] the Commission designated a longer period within which to approve the proposed rule change, disapprove the proposed rule change, or institute proceedings to determine whether to disapprove the proposed rule change.^[5] On June 2, 2017, the Commission instituted proceedings to determine whether to approve or disapprove the proposed rule change.^[6] The Commission received no comments on the proposed rule change. On June 26, 2017, CBOE withdrew the proposed rule change (SR-CBOE-2017-010).