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Notice2026-18811

Self-Regulatory Organizations; Cboe BYX Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Exchange Rules 11.1(a), 11.9(b), and 11.23 To Add a New Time-in-Force Designation Known as “Regular til Post Market”

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Published
September 15, 2026

Issuing agencies

Securities and Exchange Commission

Full Text

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<title>Federal Register, Volume 91 Issue 177 (Tuesday, September 15, 2026)</title>
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[Federal Register Volume 91, Number 177 (Tuesday, September 15, 2026)]
[Notices]
[Pages 58514-58517]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-18811]


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SECURITIES AND EXCHANGE COMMISSION

[Release No. 34-106320; File No. SR-CboeBYX-2026-030]


Self-Regulatory Organizations; Cboe BYX Exchange, Inc.; Notice of 
Filing and Immediate Effectiveness of a Proposed Rule Change To Amend 
Exchange Rules 11.1(a), 11.9(b), and 11.23 To Add a New Time-in-Force 
Designation Known as ``Regular til Post Market''

September 10, 2026.
    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 28, 2026, Cboe BYX Exchange, Inc. (the ``Exchange'' or 
``BYX'') filed with the Securities and Exchange Commission (the 
``Commission'') the proposed rule change as described in Items I and II 
below, which Items have been prepared by the self-regulatory 
organization. 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 240.19b-4.
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I. Self-Regulatory Organization's Statement of the Terms of Substance 
of the Proposed Rule Change

    Cboe BYX Exchange, Inc. (``BYX'' or the ``Exchange'') proposes to 
amend Exchange Rules 11.1(a), 11.9(b), and 11.23 to add a new Time-in-
Force (``TIF'') designation known as ``Regular til Post Market'' 
(``RTP''). The Exchange has designated the proposed rule change as 
noncontroversial and provided the Commission with the notice required 
by Rule 19b-4(f)(6)(iii) under the Act.\3\ The text of the proposed 
rule change is provided in Exhibit 5.
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    \3\ 17 CFR 240.19b-4(f)(6)(iii).
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    The text of the proposed rule change is also available on the 
Commission's website (<a href="https://www.sec.gov/rules/sro.shtml">https://www.sec.gov/rules/sro.shtml</a>), the 
Exchange's website (<a href="https://www.cboe.com/us/equities/regulation/rule_filings/byx/">https://www.cboe.com/us/equities/regulation/rule_filings/byx/</a>), and at the principal office of the Exchange.

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 Exchange proposes to amend Rule 11.9(b) (``Time-in-Force'') to 
add a new TIF designation known as ``Regular `til Post Market'' or 
``RTP.'' As proposed, an RTP order would be a limit order designated 
for execution during both Regular Trading Hours \4\ and the After Hours 
Trading Session,\5\ with any unexecuted portion expiring at the end of 
the After Hours Trading Session. In connection with the introduction of 
the RTP TIF, the Exchange also proposes conforming amendments to Rules 
11.1(a) and 11.23 to reflect the availability of the RTP TIF across the 
Exchange's order handling and opening process rules.
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    \4\ See Exchange Rule 1.5(w). The term ``Regular Trading Hours'' 
shall mean the time between 9:30 a.m. and 4:00 p.m. Eastern Time.
    \5\ See Exchange Rule 1.5(a). The After Hours Trading Session on 
BYX runs from 4:00 p.m. to 8:00 p.m. Eastern Time.
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    Currently, Rule 11.9(b) provides Users \6\ with the following TIF 
options for order entry. An ``Immediate-or-Cancel'' (``IOC'') order \7\ 
is a limit order designated for immediate execution. Any unexecuted 
portion of an IOC order is cancelled. A ``Day'' order \8\ is a limit 
order designated for execution only during Regular Trading Hours on the 
day it is entered. A ``Good, til Cancel'' (``GTC'') order \9\ is a 
limit order which, if not executed, will be cancelled by the close of 
Regular Trading Hours. A ``Good, til Day'' (``GTD'') order \10\ is a 
limit order which, if not executed, will be cancelled at the expiration 
time assigned to the order, which can be no later than the close of the 
After Hours Trading Session. A ``Good, til Extended Day'' (``GTX'') 
order \11\ is a limit order which, if not executed, will be cancelled 
by the close of the After Hours Trading Session. A ``Fill-or-Kill'' 
(``FOK'') order \12\ is a limit order designated for immediate 
execution in its entirety or cancellation as soon as it is received by 
the Exchange. A ``Regular Hours Only'' (``RHO'') order \13\ is a limit 
or market order designated for execution during Regular Trading Hours 
only. A ``Pre-Opening Session Plus'' (``PRE'') order \14\ is a limit 
order designated for execution only during the Pre-Opening Session \15\ 
and Regular Trading Hours. Any portion not executed expires at the end 
of Regular Trading Hours. A ``Pre-Opening Session til Extended Day'' 
(``PTX'') order \16\ is a limit order designated for execution during 
the Pre-Opening Session, Regular Trading Hours, and the After Hours 
Trading Session. Any portion not executed expires at the end of the 
After Hours Trading Session. A ``Pre-Opening Session til Day'' order 
\17\ is a limit order designated for execution during the Pre-Opening 
Session, Regular Trading Hours, and the After Hours Trading Session. 
Any portion not executed will be cancelled at the expiration time 
assigned to the order, which can be no later than the close of the 
After Hours Trading Session. While BYX currently offers a wide range of 
TIF designations, the Exchange does not presently offer a TIF that 
specifically combines Regular Trading Hours with the After Hours 
Trading Session in a single, dedicated designation.
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    \6\ See Exchange Rule 1.5(cc). ``User'' is defined as ``any 
Member or Sponsored Participant who is authorized to obtain access 
to the System pursuant to Rule 11.3.'' The ``System'' is ``the 
electronic communications and trading facility designated by the 
Board through which securities orders of Users are consolidated for 
ranking, execution and, when applicable, routing away.'' See 
Exchange Rule 1.5(aa). The term ``Member'' means any registered 
broker or dealer that has been admitted to membership in the 
Exchange. See Exchange Rule 1.5(n).
    \7\ See Exchange Rule 11.9(b)(1).
    \8\ See Exchange Rule 11.9(b)(2).
    \9\ See Exchange Rule 11.9(b)(3).
    \10\ See Exchange Rule 11.9(b)(4).
    \11\ See Exchange Rule 11.9(b)(5).
    \12\ See Exchange Rule 11.9(b)(6).
    \13\ See Exchange Rule 11.9(b)(7).
    \14\ See Exchange Rule 11.9(b)(8).
    \15\ See Exchange Rule 1.5(r). The term ``Pre-Opening Session'' 
shall mean the time between 8:00 a.m. and 9:30 a.m. Eastern Time.
    \16\ See Exchange Rule 11.9(b)(9).
    \17\ See Exchange Rule 11.9(b)(10).
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    Against this backdrop, the Exchange proposes to introduce the RTP 
TIF as a new, dedicated TIF option on BYX. As proposed, the RTP TIF 
would permit a User to submit a single limit order that is eligible for 
execution during Regular Trading Hours and that, if not fully executed 
during Regular Trading Hours, would remain active and eligible for 
execution during the After Hours Trading Session. Any portion of an RTP 
order not executed by the end of the

[[Page 58515]]

After Hours Trading Session would expire. An RTP order may be modified 
or cancelled in accordance with Rule 11.9(e) and order priority will be 
determined pursuant to Rule 11.12(a), just as is the case for RHO 
orders currently. The Exchange believes that adding the RTP TIF to its 
suite of available TIF designations in Rule 11.9(b) would provide Users 
with a convenient, single-instruction mechanism to participate in both 
Regular Trading Hours and the After Hours Trading Session without the 
need to submit separate orders for each session.
    In connection with the introduction of the RTP TIF, the Exchange 
also proposes to amend Rule 11.1(a) (``Hours of Trading and Trading 
Days'') to add RTP to the list of TIF designations that are subject to 
restrictions on order entry prior to 7:00 a.m. Eastern Time. Rule 
11.1(a) currently provides that the Exchange will not accept, prior to 
7:00 a.m. Eastern Time, among other orders, Minimum Quantity Orders 
that also include a Time in Force of Regular Hours Only.\18\ Because an 
RTP order, like an RHO order, is designed for execution during Regular 
Trading Hours (and, in the case of RTP, extending into the After Hours 
Trading Session), the Exchange proposes to add RTP to this restriction 
so that Minimum Quantity Orders that also include a Time in Force of 
RTP will also not be accepted prior to 7:00 a.m. Eastern Time. This 
proposed change is consistent with the treatment of RHO orders and 
ensures that orders combining the Minimum Quantity condition with the 
RTP TIF are not entered into the System during the pre-7:00 a.m. period 
before the applicable trading sessions for such orders have commenced.
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    \18\ See Exchange Rule 11.1(a). Rule 11.1(a) provides in part 
that the Exchange will not accept Minimum Quantity Orders that also 
include a Time in Force of Regular Hours Only prior to 7:00 a.m. 
Eastern Time.
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    The Exchange also proposes amendments to Rule 11.23 (``Opening 
Process'') to add RTP alongside RHO throughout that rule's provisions 
governing eligibility for and participation in the Opening Process and 
the Re-Opening Process.\19\ Specifically, the Exchange proposes to 
amend Rule 11.23(a) to provide that, prior to the beginning of Regular 
Trading Hours, Users wishing to participate in the Opening Process may 
enter orders designated as either RHO or RTP. All existing restrictions 
applicable to RHO orders in Rules 11.23(a)(1) and 11.23(a)(2) would 
apply equally to RTP orders, including the restriction prohibiting BYX 
Post Only Orders, ISOs, and Minimum Quantity Orders from participating 
in the Opening Process. The Exchange further proposes to amend Rule 
11.23(e)(1)(A) to provide that, consistent with non-RHO orders, non-RTP 
orders will be eligible for participation in the Re-Opening Process 
following a halt, subject to the same exceptions and limitations that 
currently apply to non-RHO orders.\20\ These amendments ensure that the 
RTP TIF is integrated consistently into the Exchange's opening and re-
opening processes for securities, on the same terms applicable to RHO 
orders.
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    \19\ See Exchange Rule 11.23(a). Currently, only orders 
designated as RHO are eligible to participate in the Opening Process 
for securities prior to the beginning of Regular Trading Hours.
    \20\ See Exchange Rule 11.23(e)(1)(A). Currently, non-RHO orders 
are eligible for participation in the Re-Opening Process, but IOC, 
FOK, BYX Post Only Orders, and Minimum Quantity Orders will be 
cancelled or rejected, and ISOs that are not IOC or FOK will be 
converted.
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Comparison to Other Exchange Times-in-Force
    The Exchange has also considered how other national securities 
exchanges handle TIF requirements for order entry when it comes to 
spanning the regular and after-hours trading sessions. NYSE Arca's 
trading rules provide for three trading sessions: the Early Trading 
Session, the Core Trading Session, and the Late Trading Session.\21\ 
Under NYSE Arca's framework, orders entered into the NYSE Arca 
Marketplace must include a designation for which trading session(s) the 
order will remain in effect.\22\ An order is eligible to participate in 
the designated trading session(s) only and may remain in effect for one 
or more consecutive trading sessions on a particular day.\23\ Orders 
may be accepted by the exchange that are not eligible to trade until a 
later trading session begins.\24\ Thus, NYSE Arca offers comparable 
functionality as proposed by the Exchange as it permits orders to be 
entered during its Early Trading Session that are eligible to trade in 
both the Core Trading Session and the Late Trading Session, which is 
analogous to the Exchange's proposed RTP TIF.
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    \21\ See NYSE Arca Rule 7.34-E(a). NYSE Arca's Early Trading 
Session runs from 4:00 a.m. to 9:30 a.m. Eastern Time, its Core 
Trading Session runs from 9:30 a.m. to 4:00 p.m. Eastern Time, and 
its Late Trading Session runs from the conclusion of the Core 
Trading Session until 8:00 p.m. Eastern Time. Under Rule 7.34-E, all 
order types and modifiers defined in Rule 7.31-E that are designated 
for the Early Trading Session are eligible to participate in the 
Early Trading Session, subject to certain order-type restrictions.
    \22\ See NYSE Arca Rule 7.34-E(b)(1).
    \23\ Id.
    \24\ Id.
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    Similarly, Nasdaq's Time-in-Force framework, set forth in Nasdaq 
Equity Rule 4703(a), provides that the TIF assigned to an order 
designates the period of time that the Nasdaq Market Center will hold 
the order for potential execution, with Participants specifying both a 
time at which the order becomes active and a time at which the order 
ceases to be active.\25\ Nasdaq does refer to certain periods of times 
with explicit TIFs throughout its rulebook, including ``IOC,'' ``System 
Hours Day,'' ``System Hours Expire Time,'' and, ``Market Hours Day'', 
however these terms are derived from the specific start and end times 
appended to orders, similar to the NYSE Arca functionality described 
supra. As such, Nasdaq offers comparable functionality as proposed by 
the Exchange but does so through the ability of orders to be entered 
with specific start and end times as opposed to a specific TIF as 
proposed by the Exchange.
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    \25\ See Nasdaq Equity Rule 4703(a). Nasdaq provides a list of 
acceptable times to activate and deactivate orders, which includes 
Regular Market Hours (similar to the Exchange's RHO TIF) and the end 
of System Hours (pursuant to Nasdaq Equity 1, Section 1(a)(9), the 
end of System Hours is defined as 8:00 p.m. ET, which is identical 
to the end time of the Exchange's After Hours Trading Session).
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Implementation
    The Exchange plans to implement the proposed rule change during the 
early fourth quarter of 2026 and will announce the implementation date 
via Trade Desk Notice.
2. Statutory Basis
    The Exchange believes that the proposed rule change is consistent 
with Section 6(b) of the Act,\26\ in general, and furthers the 
objectives of Section 6(b)(5) of the Act,\27\ in particular, in that it 
is 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 open market and a national market 
system, and, in general, to protect investors and the public interest.
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    \26\ 15 U.S.C. 78f.
    \27\ 15 U.S.C. 78f(b)(5).
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    The Exchange believes the proposed rule change promotes just and 
equitable principles of trade, removes impediments to and perfects the 
mechanism of a free and open market and national market system, and

[[Page 58516]]

protects investors and the public interest by providing Users with a 
convenient, streamlined mechanism to participate in both Regular 
Trading Hours and the After Hours Trading Session through the 
submission of a single order. Currently, Users seeking to maintain 
trading interest across both Regular Trading Hours and the After Hours 
Trading Session must either submit separate orders for each session or 
utilize broader TIF designations that may include trading sessions not 
desired by the User. The introduction of the RTP TIF in Rule 11.9 
directly addresses this gap by offering a dedicated, purpose-built TIF 
designation that permits a User to submit a single order eligible for 
execution during Regular Trading Hours and, if not fully executed, to 
have such order remain active through the end of the After Hours 
Trading Session. This streamlined approach promotes just and equitable 
principles of trade by enabling Users to efficiently express their 
trading interest across the regular and post-close sessions in a single 
instruction, thereby reducing operational complexity, administrative 
burden, and the potential for order entry errors that may arise from 
the need to manage multiple orders across trading sessions.
    Furthermore, the conforming amendments to Rules 11.1(a) and 11.23 
ensure that the RTP TIF is fully integrated into the Exchange's 
existing order handling and opening process framework in a manner that 
is consistent with the treatment of the existing limit RHO TIF. By 
aligning the treatment of RTP orders with RHO limit orders for purposes 
of participation in the Opening Process and Re-Opening Process, the 
Exchange ensures that RTP orders are processed in a manner that is 
transparent, predictable, and fair to all Users. The consistent 
treatment of RTP orders across the Exchange's rules promotes just and 
equitable principles of trade by providing Users with certainty as to 
how their RTP orders will be handled throughout the trading day.
    Moreover, the proposed rule change perfects the mechanism of a free 
and open market and supports a national market system by offering Users 
functionality that is comparable to that available on other national 
securities exchanges. As discussed above, NYSE Arca permits orders to 
be entered during its Early Trading Session that are eligible to trade 
in both the Core Trading Session and the Late Trading Session, 
providing comparable functionality to the Exchange's proposed RTP TIF. 
Similarly, Nasdaq's Time-in-Force framework permits Participants to 
specify both a time at which an order becomes active and a time at 
which the order ceases to be active, enabling comparable order entry 
flexibility. The Exchange's adoption of the RTP TIF ensures that Users 
have access to trading functionality on BYX that is consistent with 
industry practice and supports the efficient operation of the national 
market system by enabling Users to express their trading interest in a 
manner that is compatible with the trading mechanisms employed by other 
market centers.
    Finally, the Exchange believes that the proposed rule change is not 
designed to permit unfair discrimination. The RTP TIF would be 
available to all Users on an equal and non-discriminatory basis. The 
use of the RTP TIF is entirely optional, and no User is required to 
utilize the RTP TIF in connection with order submission to the 
Exchange. Users who do not wish to use the RTP TIF may continue to 
submit orders using any of the other TIF designations currently offered 
by the Exchange, including the Day, RHO, and PTX TIF designations.

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 RTP TIF is an optional 
designation offered by the Exchange, and Users are free to decide 
whether to use the RTP TIF in connection with order submission to the 
Exchange.
    The Exchange believes that the proposed RTP TIF and associated 
conforming amendments do not impose any intramarket burden on 
competition as they represent an enhancement to existing functionality 
that would be available to all Users on an equal and non-discriminatory 
basis. The proposed changes do not alter the way in which orders are 
prioritized, executed, or otherwise processed on the Exchange; they 
simply provide Users with an additional TIF option and integrate that 
option consistently into existing rules.
    The Exchange believes that the proposed rule change does not impose 
any undue burden on intermarket competition. On the contrary, the 
proposed changes are being made to provide Users with enhanced order 
entry flexibility that may improve their ability to interact across 
Regular Trading Hours and the After Hours Trading Session that is 
comparable to order entry flexibility on competitor exchanges, 
therefore promoting competition between venues.

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

    The Exchange has not solicited, and does not intend to solicit, 
comments on this proposed rule change. The Exchange has not received 
any unsolicited written comments from Members or other interested 
parties.

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 after 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 \28\ and 
subparagraph (f)(6) of Rule 19b-4 thereunder.\29\
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    \28\ 15 U.S.C. 78s(b)(3)(A)(iii).
    \29\ 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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    A proposed rule change filed under Rule 19b-4(f)(6) \30\ normally 
does not become operative prior to 30 days after the date of the 
filing. However, pursuant to Rule 19b4(f)(6)(iii),\31\ the Commission 
may 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 proposed 
rule change may become operative immediately upon filing. The Exchange 
states that it is seeking to introduce the proposed functionality early 
in the fourth quarter of 2026 and waiver of the operative delay will 
permit the proposed rule changes to become effective immediately. The 
Exchange further states that waiver of the operative delay will allow 
the Exchange to offer a TIF that is competitive with TIF offerings of 
Nasdaq \32\ and NYSE Arca \33\, each of which permits Users to submit 
orders during the respective Pre-Opening Session that become active 
during Regular Trading Hours and remain active through the end of the 
After Hours Trading Session. The Commission believes that waiving the

[[Page 58517]]

30-day operative delay is consistent with the protection of investors 
and the public interest as the proposal does not raise any new or novel 
issues. Therefore, the Commission hereby waives the 30-day operative 
delay and designates the proposed rule change to be operative upon 
filing.\34\
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    \30\ 17 CFR 240.19b-4(f)(6).
    \31\ 17 CFR 240.19b-4(f)(6)(iii).
    \32\ Supra note 25.
    \33\ Supra note 21.
    \34\ 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 such 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. If the Commission 
takes such action, the Commission shall institute proceedings under 
Section 19(b)(2)(B) \35\ of the Act to determine whether the proposed 
rule change should be approved or disapproved.
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    \35\ 15 U.S.C. 78s(b)(2)(B).
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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

    <bullet> Use the Commission's internet comment form (<a href="https://www.sec.gov/rules/sro.shtml">https://www.sec.gov/rules/sro.shtml</a>); or
    <bullet> Send an email to <a href="/cdn-cgi/l/email-protection#4f3d3a232a622c2022222a213b3c0f3c2a2c61282039"><span class="__cf_email__" data-cfemail="3d4f485158105e5250505853494e7d4e585e135a524b">[email&#160;protected]</span></a>. Please include 
file number SR-CboeBYX-2026-030 on the subject line.

Paper Comments

    <bullet> 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-CboeBYX-2026-030. 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 (<a href="https://www.sec.gov/rules/sro.shtml">https://www.sec.gov/rules/sro.shtml</a>). Copies of the filing 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-CboeBYX-2026-030 and should be submitted 
on or before October 6, 2026.

    For the Commission, by the Division of Trading and Markets, 
pursuant to delegated authority.\36\
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    \36\ 17 CFR 200.30-3(a)(12), (59).
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Sherry R. Haywood,
Assistant Secretary.
[FR Doc. 2026-18811 Filed 9-14-26; 8:45 am]
BILLING CODE 8011-01-P


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