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###### Securities and Exchange Commission

          - [Release No. 34-84011; File No. SR-CboeEDGX-2018-038]

                    Pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934 (the “Act”),[1]                                          and Rule 19b-4 thereunder,[2]                                          notice is hereby given that on August 24, 2018, Cboe EDGX Exchange, Inc. (the “Exchange” or “EDGX”) filed with the Securities and Exchange Commission (“Commission”) the proposed rule change as described in Items I and II below, which Items have been prepared by the Exchange. The Exchange has designated this proposal as a “non-controversial” proposed rule change pursuant to Section 19(b)(3)(A) of the Act [3]                                          and Rule 19b-4(f)(6)(iii) thereunder,[4]                                          which renders it effective upon filing with the Commission. The Commission is publishing this notice to solicit comments on the proposed rule change from interested persons.                

## I. Self-Regulatory Organization's Statement of the Terms of Substance of the Proposed Rule Change

The Exchange is proposing to expand the types of messages that Users may submit into bulk order ports.

                    The text of the proposed rule change is available at the Exchange's website at                     *www.markets.cboe.com,*                     at the principal office of the Exchange, and at the Commission's Public Reference Room.                          ( print page 45473)    

## II. Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change

In its filing with the Commission, the Exchange included statements concerning the purpose of and basis for the proposed rule change and discussed any comments it received on the proposed rule change. The text of these statements may be examined at the places specified in Item IV below. The Exchange has prepared summaries, set forth in Sections A, B, and C below, of the most significant parts of such statements.

### (A) Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change

#### 1. Purpose

                    The proposed rule change expands the types of messages that Users may submit into bulk order ports. A bulk order port is a logical port that provides Users with the ability to submit bulk messages to enter, modify, or cancel orders designated as Post Only Orders, provided such orders are entered with a Time-in-Force of Day [5]                                          or GTD [6]                                          with an expiration time on that trading day. Post Only Orders [7]                                          with a Time-in-Force of Day or GTD are orders that will be posted to and displayed by the Exchange, rather than removing liquidity or routing to another options exchange. The Exchange currently limits the use of bulk order ports to these orders to limit the use of these ports to liquidity provision. The primary purpose of bulk order ports is to encourage Users, and Market-Makers in particular, to quote on the Exchange. As a general matter, however, the overall purpose of bulk order ports is to allow Users to bundle multiple instructions in a single message and provide all Users (not just Market-Makers) with an efficient way to provide liquidity on the Exchange.                

                    The proposed rule change permits Users to submit auction responses into bulk order ports, in addition to Post Only Orders with a Time-in-Force of Day or GTD with an expiration time on that trading day. The Exchange offers various auction mechanisms that provide Users with additional execution opportunities and potential price improvement for their orders.[8]                                          When the Exchange initiates an auction, it disseminates messages that contain the relevant information about the auction order.[9]                                          The purpose of these messages is to encourage Users to provide liquidity against which the auctioned orders may trade. Users submit this liquidity in the form of auction responses. Like Post Only Orders with a Time-in-Force of Day or GTD with an expiration time on the applicable trading day, auction responses will not remove liquidity from the Exchange order book or route to another options exchange. Auction responses are similarly available for execution for a limited time period. Unexecuted auction responses are cancelled at the end of the auction, and thus do not last beyond the auction to which they were submitted.[10]                                          Because the purpose of auction responses is to provide liquidity, which is the purpose of bulk order ports, the Exchange believes it is appropriate to permit Users to submit auction responses into bulk order ports.                

                    Orders submitted to the Exchange through all ports are subject to various parameters, such as price reasonability checks and volume restrictions.[11]                                          These parameters may be configured either by the Exchange or the Member. Orders are also subject to other validation checks and processes before execution, entry into the book, or cancellation. Examples of such validation checks include validating an order's Capacity, Time-in-Force, order instructions, and routing options. While orders submitted through bulk order ports pass through these same validation checks and processes, they are not subject to parameters such as routing options and are restricted to one order instruction and two Time-in-Force options. As a result, the System can perform these validation checks with respect to orders submitted through bulk order ports in a more efficient manner.                

                    Pursuant to Exchange technical specifications,[12]                                          the order messages per second that a User may submit through a non-bulk order port is smaller than the order messages per second that a User may submit through a bulk order port. The Exchange understands from certain Members that they may restrict the number of auction response messages they submit to avoid having to obtain additional ports. The Exchange believes permitting Users to submit auction responses through bulk order ports will encourage Users to provide increased liquidity to auction mechanisms in a more cost-efficient manner. While bulk order ports have a higher monthly cost, the higher order message/second rate may ultimately be more cost-efficient than a User having to obtain multiple additional non-bulk ports to accommodate the submission of auction responses. Additionally, Users that have both bulk and non-bulk order ports would be able to increase their submission of auction responses without additional monthly fees.[13] 

#### 2. Statutory Basis

                    The Exchange believes the proposed rule change is consistent with the Securities Exchange Act of 1934 (the “Act”) and the rules and regulations thereunder applicable to the Exchange and, in particular, the requirements of Section 6(b) of the Act.[14]                                          Specifically, the Exchange believes the proposed rule change is consistent with the Section 6(b)(5) [15]                                          requirements that the rules of an exchange be designed to prevent fraudulent and manipulative acts and practices, to promote just and equitable principles of trade, to foster cooperation and coordination with persons engaged in regulating, clearing, settling, processing information with respect to, and facilitating transactions in securities, to remove impediments to and perfect the mechanism of a free and                           ( print page 45474)                        open market and a national market system, and, in general, to protect investors and the public interest. Additionally, the Exchange believes the proposed rule change is consistent with the Section 6(b)(5) [16]                                          requirement that the rules of an exchange not be designed to permit unfair discrimination between customers, issuers, brokers, or dealers.                

In particular, the Exchange believes the proposed rule change protects investors and the public interest because it provides all Users with an efficient process to enter and update auction responses. Like quoting, auction responses are a critical form of liquidity on the Exchange. Auction mechanisms and the execution and price improvement opportunities they provide are dependent on auction responses submitted during the auctions. Permitting Users to submit auction responses into bulk order ports is consistent with the purpose of these ports and have a similar purpose as the orders that Users are currently permitted to enter into bulk order ports. The Exchange believes the proposed rule change may encourage the provision of additional liquidity in auctions, which will provide additional execution and price improvement opportunities to auctioned orders, which ultimately benefit investors.

### (B) Self-Regulatory Organization's Statement on Burden on Competition

The Exchange does not believe that the proposed rule change will impose any burden on competition that is not necessary or appropriate in furtherance of the purposes of the Act. The Exchange does not believe the proposed rule change will impose any burden on intramarket competition, as the use of bulk order ports and the proposed functionality is voluntary and available to all Users of the Exchange. Bulk order entry functionality is available to all Users of the Exchange, as is the proposed functionality to submit auction responses into bulk order ports. Users may already submit auction responses to the Exchange using other types of ports—the proposed rule change merely provides Users of the Exchange with an additional method to submit auction responses to the Exchange. The Exchange does not believe the proposed rule change will have any direct impact on intermarket competition, as the proposed rule change relates solely to the manner in which Users may submit auction responses into auctions occurring on the Exchange.

### (C) Self-Regulatory Organization's Statement on Comments on the Proposed Rule Change Received From Members, Participants or Others

The Exchange has neither solicited nor received written comments on the proposed rule change.

## III. Date of Effectiveness of the Proposed Rule Change and Timing for Commission Action

                    Because the foregoing proposed rule change does not: (i) Significantly affect the protection of investors or the public interest; (ii) impose any significant burden on competition; and (iii) become operative for 30 days from the date on which it was filed, or such shorter time as the Commission may designate, it has become effective pursuant to Section 19(b)(3)(A)(iii) of the Act [17]                                          and subparagraph (f)(6) of Rule 19b-4 thereunder.[18] 

At any time within 60 days of the filing of the proposed rule change, the Commission summarily may temporarily suspend such rule change if it appears to the Commission that such action is: (i) Necessary or appropriate in the public interest; (ii) for the protection of investors; or (iii) otherwise in furtherance of the purposes of the Act. If the Commission takes such action, the Commission shall institute proceedings to determine whether the proposed rule should be approved or disapproved.

## IV. Solicitation of Comments

Interested persons are invited to submit written data, views, and arguments concerning the foregoing, including whether the proposed rule change is consistent with the Act. Comments may be submitted by any of the following methods:

### Electronic Comments

    - Use the Commission's internet comment form ( http://www.sec.gov/​rules/​sro.shtml ); or                
    - Send an email to rule-comments@sec.gov.                      Please include File Number SR-CboeEDGX-2018-038 on the subject line.                

### Paper Comments

    - Send paper comments in triplicate to Secretary, Securities and Exchange Commission, 100 F Street NE, Washington, DC 20549-1090.

                    All submissions should refer to File Number SR-CboeEDGX-2018-038. This file number should be included on the subject line if email is used. To help the Commission process and review your comments more efficiently, please use only one method. The Commission will post all comments on the Commission's internet website (                    *http://www.sec.gov/​rules/​sro.shtml*). Copies of the submission, all subsequent amendments, all written statements with respect to the proposed rule change that are filed with the Commission, and all written communications relating to the proposed rule change between the Commission and any person, other than those that may be withheld from the public in accordance with the provisions of 5 U.S.C. 552, will be available for website viewing and printing in the Commission's Public Reference Room, 100 F Street NE, Washington, DC 20549, on official business days between the hours of 10:00 a.m. and 3:00 p.m. Copies of the filing also will be available for inspection and copying at the principal office of the Exchange. All comments received will be posted without change. Persons submitting comments are cautioned that we do not redact or edit personal identifying information from comment submissions. You should submit only information that you wish to make available publicly. All submissions should refer to File Number SR-CboeEDGX-2018-038 and should be submitted on or before September 28, 2018.                

                        For the Commission, by the Division of Trading and Markets, pursuant to delegated authority.[19] 

Eduardo A. Aleman,

Assistant Secretary.

# Footnotes

1.                             15 U.S.C. 78s(b)(1).                    
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2.                             17 CFR 240.19b-4.                    
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3.                             15 U.S.C. 78s(b)(3)(A).                    
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4.                             17 CFR 240.19b-4(f)(6)(iii).                    
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5.                             An order designated as “Day” means a limit order to buy or sell that, if not executed expires at market close.                         *See*                         Rule 21.1(f)(3).                    
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6.                             An order designated as “GTD” means an order (or unexecuted portion) that will remain available for potential display and/or execution for the amount of time specified by the entering User unless cancelled by the entering party.                         *See*                         Rule 21.1(f)(1).                    
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7.                             A “Post Only Order” is an order that is to be ranked and executed on the Exchange pursuant to Rule 21.8 (Order Display and Book Processing) or cancelled, as appropriate, without routing away to another options exchange except that the order will not remove liquidity from the EDGX Options Book. A Post Only Order that is not subject to the Price adjust process that would lock or cross a Protected Quotation of another options exchange or the Exchange will be cancelled.                         *See*                         Rule 21.1(d)(8).                    
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8.                                                     *See*                         Rules 21.18 (Step Up Mechanism (“SUM”), pursuant to which eligible marketable orders are auctioned when the Exchange's disseminated quote is not at the national best bid or offer (“NBBO”)); 21.19 (Bats Auction Mechanism (“BAM”), pursuant to which a Member may submit an eligible order paired with contra interest for potential price improvement); and 21.20(d) (Complex Order Auction (“COA”), pursuant to which eligible complex orders are auctioned for execution and potential price improvement).                    
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9.                                                     *See*                         Rules 21.18(b) (the Exchange exposes orders received by SUM); 21.19(b)(1)(C) (the Exchange sends an auction notification message when it receives an order for BAM processing); and 21.20(d)(2) (the Exchange initiates the COA process by sending a COA auction message).                    
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10.                                                     *See*                         Rules 21.18(b)(3), 21.19(b)(5), and 21.20(d)(4).                    
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11.                                                     *See, e.g.,*                         Rules 21.16 and 21.17 and technical specifications available at                         *http://markets.cboe.com/​us/​options/​support/​technical/​.*
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12.                             These technical specifications are available at                         *http://markets.cboe.com/​us/​options/​support/​technical/​.*
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13.                             The Exchange notes certain Market-Makers currently only have bulk order ports, and thus are unable to provide liquidity to auction mechanisms without obtaining additional non-bulk order ports.                    
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14.                             15 U.S.C. 78f(b).                    
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15.                             15 U.S.C. 78f(b)(5).                    
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16.                                                     *Id.*
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17.                             15 U.S.C. 78s(b)(3)(A)(iii).                    
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18.                             17 CFR 240.19b-4(f)(6). In addition, Rule 19b-4(f)(6)(iii) requires a self-regulatory organization to give the Commission written notice of its intent to file the proposed rule change, along with a brief description and text of the proposed rule change, at least five business days prior to the date of filing of the proposed rule change, or such shorter time as designated by the Commission. The Exchange has satisfied this requirement.                    
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19.                             17 CFR 200.30-3(a)(12).                    
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[FR Doc. 2018-19375 Filed 9-6-18; 8:45 am]

 BILLING CODE 8011-01-P