[Federal Register Volume 88, Number 191 (Wednesday, October 4, 2023)]
[Notices]
[Pages 68890-68894]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-21942]



[[Page 68890]]

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SECURITIES AND EXCHANGE COMMISSION

[Release No. 34-98599; File No. SR-MRX-2023-18]


Self-Regulatory Organizations; Nasdaq MRX, LLC; Notice of Filing 
and Immediate Effectiveness of Proposed Rule Change To Amend Its 
Complex Order Rules

September 28, 2023.
    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 September 27, 2023, 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.
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    \1\ 15 U.S.C. 78s(b)(1).
    \2\ 17 CFR 240.19-4.
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I. Self-Regulatory Organization's Statement of the Terms of Substance 
of the Proposed Rule Change

    The Exchange proposes to amend Options 3, Section 11, Auction 
Mechanisms, and Options 3, Section 13, Price Improvement Mechanisms for 
Crossing Transactions.
    The text of the proposed rule change is available on the Exchange's 
website at https://listingcenter.nasdaq.com/rulebook/mrx/rules, 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
    In connection with a technology migration to an enhanced Nasdaq, 
Inc. (``Nasdaq'') functionality, the Exchange proposes to amend certain 
auction rules \3\ which describe the short sale price test in Rule 201 
of Regulation SHO. Specifically, the Exchange proposes to adopt a new 
sentence within Options 3, Section 11, Auction Mechanisms, and Options 
3, Section 13, Price Improvement Mechanisms for Crossing Transactions, 
to add further detail to the recently adopted stock-tied rule text.
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    \3\ See Securities Exchange Act Release No. 95854 (September 21, 
2022), 87 FR 58571 (September 27, 2022) (SR-MRX-2023-10) (Notice of 
Filing of Amendment No. 1 and Order Granting Accelerated Approval of 
a Proposed Rule Change, as Modified by Amendment No. 1, To Amend Its 
Rules Relating to Single-Leg and Complex Orders in Connection With a 
Technology Migration) (``SR-MRX-2023-10'').
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Background
    Before the migration of MRX to an enhanced technology platform, MRX 
Members were able to trade certain Stock-Option Orders as described in 
MRX Options 3, Section 14(a)(2) \4\ and Stock-Complex Orders as 
described in MRX Options 3, Section 14(a)(3),\5\ among other things. 
MRX recently filed a rule change to: (1) re-introduce stock-tied 
functionality; and (2) amend the stock-tied functionality that was 
available before the technology migration.\6\ Among other things, the 
proposal added Supplementary Material .08(c) to Options 3, Section 11 
and Supplementary Material .09(c) to Options 3, Section 13 \7\ to 
address the short sale price test in Rule 201 of Regulation SHO with 
respect to Complex PIM Orders,\8\ Complex Facilitation Orders \9\ and 
Complex SOM Orders.\10\ The rules states [sic] that when the short sale 
price test in Rule 201 of Regulation SHO is triggered for a covered 
security, Nasdaq Execution Services, LLC (``NES''),\11\ will not 
execute a short sale order in the underlying covered security component 
of a Complex Facilitation Order, Complex SOM Order and/or Response, or 
in the underlying security component of a Complex PIM Order and/or 
Improvement Order, if the price is equal to or below the current 
national best bid.\12\ However, NES will execute a short sale order in 
the underlying covered security component of a Complex Facilitation 
Order, Complex SOM Order and/or Response, or in the underlying security 
component of a Complex PIM Order and/or Improvement Order, if such 
order is marked ``short exempt,'' regardless of whether it is at a 
price that is equal to or below the current national best bid.\13\ 
Further, if NES cannot execute the underlying covered security 
component of a Complex Facilitation Order, Complex SOM Order and/or 
Response, or Complex PIM Order and/or Improvement Order, in accordance 
with Rule 201 of Regulation SHO, the Exchange will cancel back the 
Complex Facilitation Order, Complex SOM Order and/or Response or 
Complex PIM Order and/or Improvement Order to the entering Member.
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    \4\ The term ``Stock-Option Order'' refers to an order for a 
Stock-Option Strategy as defined in Options 3, Section 14(a)(2). A 
Stock-Option Strategy is the purchase or sale of a stated number of 
units of an underlying stock or a security convertible into the 
underlying stock (``convertible security'') coupled with the 
purchase or sale of options contract(s) on the opposite side of the 
market representing either (A) the same number of units of the 
underlying stock or convertible security, or (B) the number of units 
of the underlying stock necessary to create a delta neutral 
position, but in no case in a ratio greater than eight-to-one 
(8.00), where the ratio represents the total number of units of the 
underlying stock or convertible security in the option leg to the 
total number of units of the underlying stock or convertible 
security in the stock leg. See MRX Options 3, Section 14(a)(2).
    \5\ The term ``Stock-Complex Order'' refers to an order for a 
Stock-Complex Strategy as defined in Options 3, Section 14(a)(3). A 
Stock-Complex Strategy is the purchase or sale of a stated number of 
units of an underlying stock or a security convertible into the 
underlying stock (``convertible security'') coupled with the 
purchase or sale of a Complex Options Strategy on the opposite side 
of the market representing either (A) the same number of units of 
the underlying stock or convertible security, or (B) the number of 
units of the underlying stock necessary to create a delta neutral 
position, but in no case in a ratio greater than eight-to-one 
(8.00), where the ratio represents the total number of units of the 
underlying stock or convertible security in the option legs to the 
total number of units of the underlying stock or convertible 
security in the stock leg. Only those Stock-Complex Strategies with 
no more than the applicable number of legs, as determined by the 
Exchange on a class-by-class basis, are eligible for processing. See 
MRX Options 3, Section 14(a)(3).
    \6\ See SR-MRX-2023-10.
    \7\ Id.
    \8\ A Complex PIM Order is an order entered into the Complex 
Price Improvement Mechanism as described in Options 3, Section 
13(e). See MRX Options 3, Section 14(b)(18).
    \9\ A Complex Facilitation Order is an order entered into the 
Complex Facilitation Mechanism as described in Options 3, Section 
11(c). See MRX Options 3, Section 14(b)(16).
    \10\ A Complex SOM Order is an order entered into the Complex 
Solicited Order Mechanism as described in Options 3, Section 11(e). 
See MRX Options 3, Section 14(b)(17).
    \11\ NES is a broker-dealer owned and operated by Nasdaq, Inc. 
NES, an affiliate of the Exchange, has been approved by the 
Commission to become a Member of the Exchange and perform inbound 
routing on behalf of the Exchange.
    \12\ See MRX Supplementary Material .08(c) to Options 3, Section 
11 and MRX Supplementary Material .09(c) to Options 3, Section 13. 
The term ``covered security'' has the same meaning as in Rule 
201(a)(1) of Regulation SHO.
    \13\ See MRX Supplementary Material .08(c) to Options 3, Section 
11 and MRX Supplementary Material .09(c) to Options 3, Section 13.

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[[Page 68891]]

Proposal
    At this time, the Exchange proposes to amend its Complex SOM, 
Complex Facilitation, and Complex PIM rules to add a new sentence 
within Supplementary Material .08(c) to Options 3, Section 11 and 
Supplementary Material .09(c) to Options 3, Section 13 that describes 
the manner in which NES would execute a short sale order in the 
underlying covered security component of Response, Improvement Complex 
Order, or unrelated Limit Complex Order on the Complex Order Book (1) 
when the facilitating Electronic Access Member's contra-order, the 
solicited contra-side Complex Order, or the Counter-Side Order does not 
include a short sale order in the underlying covered security 
component; or (2) when the facilitating Electronic Access Member's 
contra-order, the solicited contra-side Complex Order, or the Counter-
Side Order includes a short sale order in the underlying security 
component. As described more fully below, in the first case NES would 
execute the underlying covered security component of the Response, 
Improvement Complex Order, or unrelated Limit Complex Order on the 
Complex Order Book at its stated limit price. In the second case, NES 
would execute the underlying security component of the Response, 
Improvement Complex Order, or unrelated Limit Complex Order on the 
Complex Order Book at its stated limit price or better.
    The proposed rules will make clear to Members who submit auction 
responses or Improvement Orders that include a short sale order, or 
Members that place orders on the Complex Order Book that include a 
short sale order, the manner in which NES will execute the short sale 
component of their order when their Response, Improvement Complex 
Order, or unrelated Limit Complex Order on the Complex Order Book 
executes in the Complex SOM, Complex Facilitation, and Complex PIM 
auction, (i.e. their short sale order will execute at its stated limit 
price, but not at a better price) if the facilitating Electronic Access 
Member's contra-order, the solicited contra-side Complex Order, or the 
Counter-Side Order does not include a short sale order. However their 
short sale order will execute at its stated limit price or better if 
the facilitating Electronic Access Member's contra-order, the solicited 
contra-side Complex Order, or the Counter-Side Order includes a short 
sale order. Thus, whether a short sale order included in an auction 
receives its stated limit price, or potentially receives a better price 
than its limit price, depends on whether the contra-side order 
submitted to the auction with an agency order also included a short 
sale order. Although the availability of the potential for price 
improvement for the responder's short sale order will vary, depending 
on whether the contra-order also included a short sale order, MRX notes 
that for the reasons described below the alternative would be to 
exclude auction orders that include a short sale order from the Complex 
SOM, Complex Facilitation, and Complex PIM altogether, which would 
decrease competition in the auction and potentially reduce 
opportunities for the agency order to receive price improvement in the 
auctions. Below are some examples of Complex PIM Auction responses 
(``Improvement Orders'') executing within a Complex PIM Auction.\14\
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    \14\ While the examples utilize the Complex PIM auction, the 
same examples apply to a Complex SOM or Complex Facilitation 
auction.

Example No. 1--Complex PIM Auction utilizing stated limit price
MRX BBO for option leg is 0.05 x 0.10
Underlying equity NBBO is 1.05 x 1.10
Reg SHO short sale price test is triggered in the underlying
Stock-Option Strategy is created to buy 1 put, buy 100 shares (cBBO for 
this strategy is 1.10 x 1.20)
Complex PIM to buy strategy, 100 @1.13 (buy stock @1.08 and options 
@0.05); \15\ Counter-Side Order does not include a short sale order
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    \15\ The Exchange notes that different combinations of stock and 
options prices could determine the strategy prices in this Example 1 
as well as Examples 2 and 3. The Exchange is assuming the noted 
prices for the examples, however the Exchange notes that multiple 
price points could achieve the net prices in these examples. In this 
particular case in Example 1, the agency order could buy stock @1.07 
and buy options @0.06 in lieu of the prices noted.
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Improvement Complex Order1 is a Priority Customer Order to sell, sell 
short stock leg, 100 @1.11 (sell stock @1.06 and options @0.05)
Improvement Complex Order2 to sell, sell short stock leg, 100 @1.12 
(sell stock @1.07 and options @0.05)
Complex PIM auction timer concludes

    Improvement Complex Order1 trades with Complex PIM Agency Order, 
option @0.05 and stock @1.06 for net price of 1.11. The Improvement 
Complex Order may not trade the underlying equity at 1.05 because it 
cannot execute a short sale order at a price that is equal to the NBB 
of the underlying equity.

Example No. 2--Complex PIM Auction utilizing stated limit price
MRX BBO for option leg is 0.05 x 0.10
Underlying equity NBBO is 1.05 x 1.10
Reg SHO short sale price test is triggered in the underlying
Stock-Option Strategy is created to buy 1 put, buy 100 shares (cBBO for 
this strategy is 1.10 x 1.20)
Complex PIM to buy strategy, 100 @1.13 (buy stock @1.08 and options 
@0.05); Counter-Side
Order does not include a short sale order
Improvement Complex Order1 is a Priority Customer Order to sell, sell 
short stock leg, 100 @1.10 (sell stock @1.05 and options @0.05)
Improvement Complex Order2 to sell, sell short stock leg, 100 @1.12 
(sell stock @1.06 and options @0.06)
Complex PIM auction timer concludes

    Improvement Complex Order2 trades with Complex PIM Agency Order, 
option @0.06 and stock @1.06 for net price of 1.12. Since the Counter-
Side Order does not include a short sale order, Improvement Complex 
Order1 is considered for execution at its stated limit price of 1.10; 
since it cannot trade at 1.10 due to Reg SHO, it does not trade with 
the Complex PIM Agency Order.

Example No. 3--Complex PIM Auction where Counter-Side is also short 
selling
MRX BBO for option leg is 0.05 x 0.10
Underlying equity NBBO is 1.05 x 1.20
Counter-Side Order includes a short sale order
Reg SHO short sale price test is triggered in the underlying
Stock-Option Strategy is created to buy 1 put, buy 100 shares (cBBO for 
this strategy is 1.10 x 1.30)

    Complex PIM to Buy strategy, 100 @1.13, Counter-Side Order is a 
Market Order that is willing to auto-match at any price point within 
Reg SHO price restriction bound and has `sell short' stock leg 
instructions and therefore cannot trade the stock component at any 
price less than or equal to the underlying best bid of $1.05. In this 
example, if the Counter-Side Order did not have a ``sell short'' 
instruction it would not be required to trade at a price that is better 
than the NBB for security ($1.05) and could execute at a price equal to 
or less than the underlying best bid of $1.05. The price of 1.10 is the 
cBB (net of option and underlying NBB).

Improvement Complex Order1 is to sell, sell short stock leg, 100 @1.10 
(selling stock at 1.05 and options at 0.05; note it cannot trade at 
1.10 due to Reg SHO)
Improvement Complex Order2 to sell, sell short stock leg, 100 @1.12 
(selling stock at 1.06 and options at 0.06)
Complex PIM auction timer concludes

    The Complex PIM Agency Order first executes 40 contracts with the 
Counter-

[[Page 68892]]

Side Market Order, the option leg at 0.05 and stock leg at 1.06 for a 
net price of 1.11. The remaining 60 contracts from the Complex Agency 
Order then execute with Improvement Complex Order1 at the same price. 
In this example, both the Complex Counter-Side Order and the 
Improvement Complex Order are marked short sale, which permits the 
Improvement Complex Order to trade at a price that is better than its 
stated limit price.
    In this example, the Improvement Complex Order traded at its next 
available price in lieu of its stated limit price because both the 
Counter-Side Order and the Improvement Complex Order included a short 
sale order in the underlying component security. In contrast, if the 
Counter-Side Order did not include a short sale order than the Counter-
Side Order and Improvement Complex Order2 trade with the Complex PIM 
Agency Order for net price of 1.12 (option @0.06 and stock @1.06).
    The Exchange proposes to amend the rule text in Supplementary 
Material .08 to Options 3, Section 11 with respect to a SOM and 
Facilitation auction to provide:

    When a response or an unrelated limit complex order on the 
complex order book includes a short sale order in the underlying 
covered security, NES will execute such order at (1) its stated 
limit price if the facilitating Electronic Access Member's contra 
order or contra-side solicited Complex Order does not include a 
short sale order in the underlying security; or (2) its stated limit 
price or better if the facilitating Electronic Access Member' contra 
order or the solicited contra-side Complex Order includes a short 
sale order in the underlying covered security.

    With respect to a Complex PIM auction, the Exchange proposes to 
amend the rule text within Supplementary Material .09 to Options 3, 
Section 13 to provide:

    When an improvement order or an unrelated limit complex order on 
the complex order book includes a short sale order in the underlying 
covered security, NES will execute such order at (1) its stated 
limit price if the Counter-Side Order does not include a short sale 
order in the underlying security; or (2) its stated limit price or 
better if the counter-side order includes a short sale order in the 
underlying covered security.

    In such case where a response or an unrelated limit complex order 
on the complex order book includes a short sale order in the underlying 
covered security, NES will execute the order at its stated limit price 
if the facilitating Electronic Access Member's contra order, contra-
side solicited Complex Order, or Counter-Side Order does not include a 
short sale order in the underlying covered security because the 
Exchange desires to foster competition by including responses that have 
a short sale order in the underlying covered security. In this 
scenario, the Exchange would consider all prices submitted by 
responders at which the auction may execute because the Electronic 
Access Member's contra order, contra-side solicited Complex Order, or 
Counter-Side Order does not need to comply with the short sale price 
test in Rule 201 of Regulation SHO because the order is not short. By 
using the order's stated limit price in this case, the Exchange would 
allow the responder with a short sale order to participate in the 
auction and allocate the best price possible to the agency order while 
complying with the short sale price test.\16\ The Exchange believes 
that including responses with a short sale order in the underlying 
covered security may create additional competition in the Complex SOM, 
Complex Facilitation and Complex PIM auction while also providing 
additional opportunity for potential price improvement for the agency 
order.
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    \16\ For example, utilizing a Complex PIM auction with a BBO of 
0.05 x 0.10 and an NBBO for the underlying security component of 
1.05 x 1.10, if the Initiating Order submitted an agency order to 
buy @1.13 and a contra-order to sell @1.13, with auto-match at any 
price point, and Responder1 was long @1.10, and Responder2 was short 
@1.10 (in this scenario 1.10 would not comply with the short sale 
price test), pursuant to the proposed amendment, the agency order 
would receive a price improvement allocation @1.10. In this scenario 
the improved price of 1.11 would not be allocated to the responder 
with a short sale rather the price improvement would be applied to 
the agency order. The Exchange believes it is important to offer 
price improvement to the agency order over the responder to the 
auction. Of note, the responder that was short @1.10 would be 
cancelled.
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    When a response, Improvement Order, or an unrelated limit complex 
order on the complex order book includes a short sale order in the 
underlying covered security, NES will execute the order at its stated 
limit price or better if the facilitating Electronic Access Member 
contra order, solicited contra-side Complex Order, or Counter-Side 
Order includes a short sale order in the underlying security component. 
In this case, each short sale compliant price would be considered in 
determining the price at which the auction may execute, which would be 
at its stated limit price or better. In this scenario, because the 
Electronic Access Member contra order, solicited contra-side Complex 
Order, or Counter-Side Order are short, the Exchange will only consider 
prices that comply with the short sale price test in Rule 201 of 
Regulation SHO. In this case, all prices that are compliant with the 
short sale price test are considered when allocating the auction, and 
both the agency order and responders may receive a better price. The 
auction would allocate at the agency order's stated limited price or 
better depending on the prices of the responses. The auction responses 
may execute at their stated limited price or better depending on the 
final auction price.
    This is in contrast to the prior scenario where the Electronic 
Access Member's contra order, contra-side solicited Complex Order, or 
Counter-Side Order does not need to comply with the short sale price 
test. Utilizing the proposed stated limit price or better where a 
Member's contra order, contra-side solicited Complex Order, or Counter-
Side Order includes a short sale order allows the Exchange to 
potentially provide price improvement opportunity to the agency order.
Implementation
    This Exchange intends to begin implementation of the proposed rule 
change prior to November 1, 2023. The Exchange will issue an Options 
Trader Alert to Members with the operative date.
2. Statutory Basis
    The Exchange believes that its proposal is consistent with Section 
6(b) of the Act,\17\ in general, and furthers the objectives of Section 
6(b)(5) of the Act,\18\ in particular, in that it is designed to 
promote just and equitable principles of trade and to protect investors 
and the public interest for the reasons discussed below.
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    \17\ 15 U.S.C. 78f(b).
    \18\ 15 U.S.C. 78f(b)(5).
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    With respect to short sale regulation, the proposed handling of the 
stock/ETF component of a Complex Order under this proposal does not 
raise any issues of compliance with the currently operative provisions 
of Regulation SHO \19\ and, therefore, the proposal promotes just and 
equitable principles of trade. When a Complex Order has a stock/ETF 
component, Members must indicate, pursuant to Regulation SHO, whether 
that order involves a long or short sale. NES, as a trading center 
under Rule 201, will be compliant with the requirements of Regulation 
SHO. Of course, broker-dealers, including both NES and the Members 
submitting orders to MRX with a stock/ETF component, must comply with 
Regulation SHO. NES' compliance team updates, reviews and monitors NES' 
policies and procedures including those pertaining to Regulation SHO on 
an annual basis.
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    \19\ 17 CFR 242.200 et seq.

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[[Page 68893]]

    In the case where a response, Improvement Order, or an unrelated 
limit complex order includes a short sale order in the underlying 
covered security, executing such order at its stated limit price when 
the facilitating Electronic Access Member's contra order, contra-side 
Complex Order, or Counter-Side Order does not include a short sale 
order in the underlying security would protect investors and the public 
interest by considering all prices at which the auction could execute. 
Under these circumstance, the Response, Improvement Complex Order, or 
unrelated Limit Complex Order would be considered for execution at its 
stated limit price (provided the limit price is compliant with the 
short sale price test in Rule 201 of Regulation SHO) while the 
Electronic Access Member's contra order, contra-side solicited Complex 
Order, or Counter-Side Order does not need to comply with the short 
sale price test in Rule 201 of Regulation SHO because the order is not 
short. Utilizing the order's stated limit price in this case allows the 
responder with a short sale order to participate in the auction while 
the agency order is allocated the best price possible while complying 
with the short sale price test. The Exchange believes that this 
behavior is consistent with the protection of investors and the public 
interest because it attempts to afford price improvement to the agency 
order over the responder to the auction. Finally, the Exchange believes 
that including responses with a short sale order in the underlying 
covered security may create additional competition in the Complex SOM, 
Complex Facilitation and Complex PIM auction and provides the agency 
order with additional opportunities for potential price improvement.
    In contrast, when the facilitating Electronic Access Member's 
contra order, contra-side Complex Order, or Counter-Side Order includes 
a short sale order in the underlying covered security, the auction must 
be allocated at a price that is short sell compliant. In this case, 
each short sale compliant price would be considered in determining the 
price at which the Complex SOM, Complex Facilitation and Complex PIM 
auction may execute and, because the Electronic Access Member contra 
order, solicited contra-side Complex Order, or Counter-Side Order are 
short, the Exchange will only consider prices that comply with the 
short sale price test in Rule 201 of Regulation SHO. As a result, the 
auction may allocate at the agency order's stated limited price or 
better depending on the prices of the responses. Also, the auction 
responses may execute at their stated limited price or better depending 
on the final auction price. The Exchange believes its proposal is 
consistent with the Act and the protection of investors because both 
the agency order and responders may receive a better price in this 
case. This is in contrast to the prior scenario where the Electronic 
Access Member's contra order, contra-side solicited Complex Order, or 
Counter-Side Order does not need to comply with the short sale price 
test. Utilizing the proposed stated limit price or better where a 
Member's contra order, contra-side solicited Complex Order, or Counter-
Side Order includes a short sale order allows the Exchange to 
potentially provide a price improvement opportunity to the agency order 
and to the auction response. With the proposed amendments, Complex SOM, 
Complex Facilitation, and Complex PIM auction responders who submit a 
response would be aware of the auction price that would comply with the 
short sale price test in Rule 201 of Regulation SHO. The proposed 
amendment allows Members to participate in auctions with a short sale 
response and such participation facilitates competition in these 
auctions. This proposed approach is in lieu of prohibiting Members 
[sic] to respond to these auctions, which would limit competition. By 
allowing additional responses to participate in the auction, the 
Exchange believes that the proposal would benefit investors and the 
public interest because the additional interest may increase 
competition in these auctions, which may lead to better prices.

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 not necessary or appropriate in 
furtherance of the purposes of the Act.
    Where a response, Improvement Order, or an unrelated limit complex 
order includes a short sale order in the underlying covered security, 
executing such order at its stated limit price when the facilitating 
Electronic Access Member's contra order, contra-side Complex Order, or 
Counter-Side Order does not include a short sale order in the 
underlying covered security does not impose an undue burden on intra-
market competition because the Exchange would uniformly consider all 
prices submitted by responders in determining the allocation price 
because the Electronic Access Member's contra order, contra-side 
solicited Complex Order, or Counter-Side Order does not need to comply 
with the short sale price test in Rule 201 of Regulation SHO because 
the order is not short. Where a response, Improvement Order, or an 
unrelated limit complex order includes a short sale order in the 
underlying covered security, executing such order at its stated limit 
price or better when the facilitating Electronic Access Member's contra 
order, contra-side Complex Order, or Counter-Side Order is also a short 
sale order in the underlying covered security component does not impose 
an undue burden on intra-market competition because the Exchange would 
uniformly consider all prices that are compliant with the short sale 
price test when allocating the auction.
    Where a response, Improvement Order, or an unrelated limit complex 
order includes a short sale order in the underlying covered security, 
executing such order at its stated limit price when the facilitating 
Electronic Access Member's contra order, contra-side Complex Order, or 
Counter-Side Order does not include a short sale order in the 
underlying covered security and executing such order its stated limit 
price or better when the facilitating Electronic Access Member contra-
order, solicited contra-side Complex Order, or Counter-Side Order is 
also a short sale order in the underlying covered security component 
does not impose an undue burden on inter-market competition because 
other options exchanges today may offer a similar process for handling 
stock-tied transactions that have a short sale order.

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 \20\ and Rule 
19b-4(f)(6) thereunder.\21\
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    \20\ 15 U.S.C. 78s(b)(3)(A)(iii).
    \21\ 17 CFR 240.19b-4(f)(6). In addition, Rule 19b-4(f)(6) 
requires the Exchange 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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[[Page 68894]]

    A proposed rule change filed under Rule 19b-4(f)(6) \22\ normally 
does not become operative prior to 30 days after the date of the 
filing. However, Rule 19b-4(f)(6)(iii) \23\ permits the Commission to 
designate a shorter time if such action is consistent with the 
protection of investors and the public interest. The Exchange has asked 
the Commission to waive the 30-day operative delay so that the proposal 
may become operative immediately upon filing. The Exchange states that 
waiver of the 30-day operative delay will allow the Exchange to include 
the proposed functionality when it re-introduces the stock-tied 
functionality on the Exchange. As discussed above, the proposed 
functionality will allow auction responses, unrelated Limit Complex 
Orders on the Complex Order Book, and Improvement Orders that include a 
short sale order to participate in the Complex Facilitation Mechanism, 
Complex SOM, and Complex PIM auctions, as applicable. Although the 
potential execution price of the auction response or Limit Complex 
Order will vary depending on whether the contra order submitted to the 
auction with the agency order also includes a short sale order, the 
Exchange states that the alternative would be to exclude responses and 
unrelated Limit Complex Orders that include a short sale order from the 
Complex Facilitation Mechanism, Complex SOM, and Complex PIM auctions 
altogether. The Commission finds that it is consistent with the 
protection of investors and the public interest to waive the 30-day 
operative delay. The Commission believes that the proposal will benefit 
investors by allowing auction responses, Improvement Orders, and 
unrelated Limit Complex Orders that include a short sale order to 
participate in the Complex Facilitation Mechanism, Complex SOM, and 
Complex PIM auctions, which could increase competition in the auctions 
and potentially result in better prices for agency orders executed in 
the auctions. In addition, the proposal will make clear to market 
participants that submit auction responses that include a short sale 
order, or that enter Limit Complex Orders that include a short sale 
order, of the prices that their orders may receive when they execute in 
a Complex Facilitation Mechanism, Complex SOM, or Complex PIM auction. 
Therefore, the Commission waives the 30-day operative delay and 
designates the proposal operative upon filing.\24\
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    \22\ Id.
    \23\ 17 CFR 240.19b-4(f)(6)(iii).
    \24\ For purposes only of waiving the 30-day operative delay, 
the Commission has also considered the proposed rule's impact on 
efficiency, competition, and capital formation. See 15 U.S.C. 
78c(f).
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    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 necessary or 
appropriate in the public interest, for the protection of investors, or 
otherwise in furtherance of the purposes of the Act.

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 (https://www.sec.gov/rules/sro.shtml); or
     Send an email to [email protected]. Please include 
file number SR-MRX-2023-18 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-2023-18. 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 (https://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 
a.m. and 3 p.m. Copies of the filing also will be available for 
inspection and copying at the principal office of the Exchange. Do not 
include personal identifiable information in submissions; you should 
submit only information that you wish to make available publicly. We 
may redact in part or withhold entirely from publication submitted 
material that is obscene or subject to copyright protection. All 
submissions should refer to file number SR-MRX-2023-18 and should be 
submitted on or before October 25, 2023.
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    \25\ 17 CFR 200.30-3(a)(12), (59).

    For the Commission, by the Division of Trading and Markets, 
pursuant to delegated authority.\25\
Sherry R. Haywood,
Assistant Secretary.
[FR Doc. 2023-21942 Filed 10-3-23; 8:45 am]
BILLING CODE 8011-01-P