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###### Securities and Exchange Commission

          - [Release No. 34-83730; File No. SR-MRX-2018-25]

                    Pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934 (“Act”),[1]                                          and Rule 19b-4 thereunder,[2]                                          notice is hereby given that on July 16, 2018, Nasdaq MRX, LLC (“MRX” or “Exchange”) 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 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 proposes to codify the definitions of the protocols that Members can use to enter quotes and orders on the Exchange.

                    The text of the proposed rule change is available on the Exchange's website at                     *http://nasdaqmrx.cchwallstreet.com/​,*                     at the principal office of the Exchange, and at the Commission's Public Reference Room.                

## 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 aspects of such statements.

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

#### 1.  Purpose 

                    The purpose of the proposed rule change is to codify the definitions of the protocols that Members use to enter quotes and orders on the Exchange, specifically, the Specialized Quote Feed (“SQF”), Ouch to Trade Options (“OTTO”), and Financial Information eXchange (“FIX”). On July 20, 2017, the Exchange filed a proposed rule change that established the ports that Members use to connect to the Exchange, including ports used for quote and order entry—                    *i.e.,*                     SQF, OTTO and FIX.[3]                                          The protocols used by Members to submit quotes and orders play an important role in the operation of the trading system as critical Exchange functionality used by Members to transact in options is offered through                           ( print page 37874)                        these protocols. The Exchange therefore believes that codifying definitions of these protocols in its rules will increase transparency around its operations.                

                    The proposed language is substantially similar to the language included in SR-MRX-2017-13 with changes to more clearly and accurately reflect the certain information included on each protocol, such as by separating out different categories of messages (                    *e.g.,*                     auction orders, auction notifications, and auction responses). Furthermore, the proposed definitions will be harmonized where appropriate with definitions to be included in the rules of the Exchange's affiliated options markets, including by using consistent terms to define the buckets of information transmitted, or the features available, on each protocol.[4]                                          Although the Exchange is changing how it categorizes various features included on FIX, OTTO, and SQF as part of its harmonization effort, the list of features included in the proposed definitions are intended to be exhaustive with respect to the buckets of information provided on each protocol. The Exchange believes that the proposed changes will allow Members to more easily understand what information is available on which protocol.                

                    As proposed, Supplementary Material .03 to Rule 715 (                    *i.e.,*                     Types of Orders) will provide that the Exchange offers Members the following protocols for entering orders and quotes respectively:                

#### A.  Financial Information eXchange Ports 

                    When the Exchange initially filed to adopt order and quote entry protocols, it described the FIX protocol as follows: “FIX is an interface that allows market participants to connect and send orders and auction orders into the Exchange. Data includes the following: (1) Options Symbol Directory Messages; (2) System Event Messages (                    *e.g.,*                     start of messages, start of system hours, start of quoting, start of opening); (3) Option Trading Action Messages (                    *e.g.,*                     halts, resumes); (4) Execution Messages; (5) Order Messages (order messages, risk protection triggers or purge notifications).”                

                    The Exchange now proposes to codify the following definition of FIX in its rulebook: “Financial Information eXchange” or “FIX” is an interface that allows Members and their Sponsored Customers [5]                                          to connect, send, and receive messages related to orders and auction orders to the Exchange. Features include the following: (1) Execution messages; (2) order messages; (3) risk protection triggers and cancel notifications; and (4) post trade allocation messages.                

### B.  Ouch To Trade Options Ports 

                    When the Exchange initially filed to adopt order and quote entry protocols, it described the OTTO protocol as follows: “OTTO is an interface that allows market participants to connect and send orders, auction orders and auction responses into the Exchange. Data includes the following: (1) Options Auction Notifications (                    *e.g.,*                     Flash, PIM, Solicitation and Facilitation or other information); (2) Options Symbol Directory Messages; (3) System Event Messages (                    *e.g.,*                     start of messages, start of system hours, start of quoting, start of opening); (5) Option Trading Action Messages (                    *e.g.,*                     halts, resumes); (6) Execution Messages; (7) Order Messages (order messages, risk protection triggers or purge notifications).”                

                    The Exchange now proposes to codify the following definition of OTTO in its rulebook: “Ouch to Trade Options” or “OTTO” is an interface that allows Members and their Sponsored Customers to connect, send, and receive messages related to orders, auction orders, and auction responses to the Exchange. Features include the following: (1) Options symbol directory messages (                    *e.g.,*                     underlying instruments); (2) system event messages (                    *e.g.,*                     start of trading hours messages and start of opening); (3) trading action messages (                    *e.g.,*                     halts and resumes); (4) execution messages; (5) order messages; (6) risk protection triggers and cancel notifications; (7) auction notifications; (8) auction responses; and (9) post trade allocation messages.                

### C.  Specialized Quote Feed Ports 

                    When the Exchange initially filed to adopt order and quote entry protocols, it described the SQF protocol as follows: “SQF is an interface that allows market makers to connect and send quotes, sweeps and auction responses into the Exchange. Data includes the following: (1) Options Auction Notifications (                    *e.g.,*                     opening imbalance, Flash, PIM, Solicitation and Facilitation or other information); (2) Options Symbol Directory Messages; (3) System Event Messages (                    *e.g.,*                     start of messages, start of system hours, start of quoting, start of opening); (4) Option Trading Action Messages (                    *e.g.,*                     halts, resumes); (5) Execution Messages; (6) Quote Messages (quote/sweep messages, risk protection triggers or purge notifications).”                

                    The Exchange now proposes to codify the following definition of SQF in its rulebook: “Specialized Quote Feed” or “SQF” is an interface that allows market makers to connect, send, and receive messages related to quotes, Immediate-or-Cancel Orders, and auction responses to the Exchange. Features include the following: (1) Options symbol directory messages (                    *e.g.,*                     underlying instruments); (2) system event messages (                    *e.g.,*                     start of trading hours messages and start of opening); (3) trading action messages (                    *e.g.,*                     halts and resumes); (4) execution messages; (5) quote messages; (6) Immediate-or-Cancel Order messages; (7) risk protection triggers and purge notifications; (8) opening imbalance messages; (9) auction notifications; and (10) auction responses. The SQF Purge Interface only receives and notifies of purge requests from the market maker.[6] 

#### 2.  Statutory Basis 

                    The Exchange believes that the proposed rule change is consistent with Section 6(b) of the Securities Exchange Act of 1934 (the “Act”),[7]                                          in general, and furthers the objectives of Section 6(b)(5) of the Act,[8]                                          in particular, in that it is designed to promote just and equitable principles of trade, to remove impediments to and perfect the mechanism for a free and open market and a national market system, and, in general, to protect investors and the public interest.                

The Exchange believes that the proposed rule change is consistent with the protection of investors and the public interest as it codifies the protocols used to connect to the Exchange's trading system. As discussed above, the Exchange previously filed to establish FIX, OTTO, and SQF in SR-MRX-2017-13. These protocols will now be codified in the Exchange's rulebook.

                    While no functional changes to the protocols are proposed in this filing, the Exchange believes that including a description of the protocols in its                           ( print page 37875)                        rulebook will benefit Members by increasing transparency around the operation of the Exchange. Furthermore, the proposed definitions being included in the rulebook will more clearly and accurately reflect the information included on the protocols, and will be harmonized with language to be included in the rules of its affiliated exchanges to the extent that the protocols operate in the same manner. The protocols described in this filing provide a range of important features to Members, including the ability to submit quotes and orders, and perform other functions necessary to manage trading on the Exchange. The Exchange believes codifying the quote and order entry protocols will increase transparency to the Members that use these protocols to connect to the Exchange.                

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

                    In accordance with Section 6(b)(8) of the Act,[9]                                          the Exchange does not believe that the proposed rule change will impose any burden on intermarket or intramarket competition that is not necessary or appropriate in furtherance of the purposes of the Act. As explained above, the Exchange is codifying the quote and order entry protocols that Members use to connect to the Exchange's trading system. The Exchange does not believe that codifying these protocols in the rulebook will have any competitive impact. FIX, OTTO, and SQF were established in SR-MRX-2017-13, and are already available to Members, who use these protocols to connect and manage their trading activity on the Exchange. Adding rule language that describes these Exchange offerings will increase transparency around the operation of the Exchange without having any impact on intermarket or intramarket competition.                

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

No written comments were either solicited or received.

## 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 [10]                                          and subparagraph (f)(6) of Rule 19b-4 thereunder.[11] 

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-MRX-2018-25 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-MRX-2018-25. 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-MRX-2018-25 and should be submitted on or before August 23, 2018.                

                        For the Commission, by the Division of Trading and Markets, pursuant to delegated authority.[12] 

Robert W. Errett,

Deputy 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.                                                     *See*                         Securities Exchange Act Release No. 81312 (August 3, 2017), 82 FR 37253 (August 9, 2017) (SR-MRX-2017-13).                    
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4.                             The Exchange's affiliates—                        *i.e.,*                         Nasdaq ISE, LLC (“ISE”), Nasdaq GEMX, LLC (“GEMX”), Nasdaq PHLX LLC (“Phlx”), Nasdaq Options Market (“NOM”), and Nasdaq BX, LLC (“BX”)—intend to file similar rule changes as part of this exercise.                    
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5.                             A “Sponsored Customer” is a non-member of the Exchange that trades under a sponsoring member's execution and clearing identity pursuant to a sponsorship arrangement between such non-member and sponsoring member, as set forth in Supplementary Material to Rule 706.                    
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6.                             All of the notification messages available on SQF ports as described above (                        *i.e.,*                         options symbol directory messages, system event messages, trading action messages, etc.) are configurable in that market makers can select the specific types of notifications they wish to receive on their SQF ports. As such, SQF Purge Interface ports are a subpart of SQF ports that have been configured to only receive and notify of purge requests.                    
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7.                             15 U.S.C. 78f(b).                    
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8.                             15 U.S.C. 78f(b)(5).                    
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9.                             15 U.S.C. 78f(b)(8).                    
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10.                             15 U.S.C. 78s(b)(3)(A)(iii).                    
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11.                             17 CFR 240.19b-4(f)(6). In addition, Rule 19b-4(f)(6) requires a self-regulatory organization to give the Commission written notice of its intent to file 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. In this case, the Commission waives the five-day pre-filing requirement.                    
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12.                                 17 CFR 200.30-3(a)(12).                        
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[FR Doc. 2018-16526 Filed 8-1-18; 8:45 am]

 BILLING CODE 8011-01-P