Skip to main content
Notice2026-20074

Self-Regulatory Organizations; CME Securities Clearing Inc.; Order Approving Proposed Rule Change To amend the CMESC Stress Testing & Guaranty Fund Sizing Policy and Proposed Amendments to Rule 402(b)

Primary source

Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.

Published
October 1, 2026

Issuing agencies

Securities and Exchange Commission

Full Text

<html>
<head>
<title>Federal Register, Volume 91 Issue 189 (Thursday, October 1, 2026)</title>
</head>
<body><pre>
[Federal Register Volume 91, Number 189 (Thursday, October 1, 2026)]
[Notices]
[Pages 62580-62584]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-20074]


-----------------------------------------------------------------------

SECURITIES AND EXCHANGE COMMISSION

[Release No. 34-106516; File No. SR-CMESC-2026-006]


Self-Regulatory Organizations; CME Securities Clearing Inc.; 
Order Approving Proposed Rule Change To amend the CMESC Stress Testing 
& Guaranty Fund Sizing Policy and Proposed Amendments to Rule 402(b)

September 28, 2026.

I. Introduction

    On August 6, 2026, CME Securities Clearing Inc. (``CMESC'') filed 
with the Securities and Exchange Commission (``Commission'') proposed 
rule change SR-CMESC-2026-006 (``Proposed Rule Change''), pursuant to 
Section 19(b)(1) of the Securities Exchange Act of 1934 (the ``Exchange 
Act'') \1\ and Rule 19b-4 \2\ thereunder. The Proposed Rule Change 
would amend the CMESC Stress Testing & Guaranty Fund Sizing Policy (or 
the ``Policy'') \3\ and amend Rule 402(b) of the CMESC Rulebook 
(``CMESC Rules'').\4\ The proposed rule change was published for 
comment in the Federal Register on August 18, 2026.\5\ The Commission 
has received no comments on the changes proposed. For the reasons 
discussed below, the

[[Page 62581]]

Commission is approving the proposed rule change.
---------------------------------------------------------------------------

    \1\ 15 U.S.C. 78s(b)(1).
    \2\ 17 CFR 240.19b-4.
    \3\ As part of the Proposed Rule Change, CMESC filed, as Exhibit 
5b, changes proposed to the Policy. Pursuant to 17 CFR 240.24b-2, 
CMESC requested confidential treatment of the Exhibit 5b.
    \4\ The CMESC Rules are available at <a href="https://www.cmegroup.com/rulebook/CMESC/CMESC%20Rulebook.pdf">https://www.cmegroup.com/rulebook/CMESC/CMESC%20Rulebook.pdf</a>. Terms not otherwise defined 
herein are defined in the CMESC Rules or in the Proposed Rule 
Change.
    \5\ Securities Exchange Act Release No. 106131 (Aug. 13, 2026), 
91 FR 53469 (Aug. 18, 2026) (File No. SR-CMESC-2026-006) (``Notice 
of Filing'').
---------------------------------------------------------------------------

II. Background

    Under the Policy, CMESC states that it performs stress testing to 
estimate its exposures to participants that could result from the 
realization of potential stress scenarios, such as extreme price 
changes, multiple defaults, or changes in other valuation inputs and 
assumptions.\6\ CMESC states that the Policy provides that stress 
scenarios are built using historical and hypothetical market moves.\7\ 
CMESC further states that it uses identical stress scenarios for 
purposes of credit stress testing and liquidity stress testing to 
ensure that CMESC has adequate resources to manage its credit risk and 
liquidity risk in extreme but plausible market conditions.\8\
---------------------------------------------------------------------------

    \6\ See Notice of Filing, supra note 5, at 53469.
    \7\ Id.
    \8\ See Notice of Filing, supra note 5, at 53470.
---------------------------------------------------------------------------

    CMESC states that it currently uses the stress testing methodology 
to size and maintain its Guaranty Fund.\9\ Specifically, the Guaranty 
Fund is sized to cover an amount at least equal to the largest 
theoretical loss to CMESC in excess of initial margin resulting from 
the default of two member families (the ``cover two standard'').\10\ In 
determining the largest theoretical loss resulting from the default of 
two member families, CMESC measures the largest net debtor amount 
(``LND'') at the Member Family-level, covering Member Accounts and the 
User Accounts of a predefined number of Users with the largest credit 
exposures at each Member.\11\ Under CMESC Rules, CMESC may maintain the 
Guaranty Fund size at an amount larger than the cover two standard, 
with a buffer based on CMESC's assessment of the cover two amounts, 
volatility in the market, or for other reasons, in order to better 
ensure that the Guaranty Fund meets the cover two standard between 
official calculations and to prevent significant fluctuations of 
Members' Required Guaranty Fund Contributions.\12\
---------------------------------------------------------------------------

    \9\ See Notice of Filing, supra note 5, at 53469.
    \10\ See CMESC Rule 402(a), supra note 4.
    \11\ See Notice of Filing, supra note 5, at 53471.
    \12\ See CMESC Rule 402(a), supra note 4.
---------------------------------------------------------------------------

    Under CMESC Rules, a member's Required Guaranty Fund Contribution 
is calculated based on each Member's proportionate share of the 
aggregate Required Guaranty Fund Contribution and subject to a ten 
million dollar minimum contribution amount.\13\ CMESC states that the 
Policy provides the allocation of the Guaranty Fund to determine each 
Member's Required Guaranty Fund Contribution amount be based on each 
member's relative LND and its gross notional at a weight of 90% and 
10%, respectively.\14\
---------------------------------------------------------------------------

    \13\ See CMESC Rule 402(b), supra note 4. CMESC states that each 
Member's Required Guaranty Fund Contribution is calculated as the 
greater of two amounts: (1) a minimum contribution requirement of 
ten million dollars, or (2) the Member's proportionate share of the 
Guaranty Fund. See Notice of Filing, supra note 5, at 53471.
    \14\ See Notice of Filing, supra note 5, at 53471.
---------------------------------------------------------------------------

III. Description of the Proposed Rule Change

    CMESC proposes to amend the Policy to: (i) provide greater detail 
in the description of its scenarios for stress testing, including the 
historical and hypothetical stress scenarios it will employ for credit 
stress testing and liquidity stress testing; (ii) provide further 
explanation of the rationale for CMESC's methodology for sizing the 
Guaranty Fund and the rationale for how Member contributions to the 
Guaranty Fund are allocated, particularly regarding the weighted 
components on which allocation of Members' contributions to the 
Guaranty Fund are based; and (iii) make other minor changes to add 
clarity and improve accuracy and readability of the Policy.\15\ 
Further, CMESC proposes to modify existing Rule 402(b) to clarify and 
align the description of the Guaranty Fund allocation process across 
its documentation.\16\ Each of the proposed changes is described in 
more detail below.
---------------------------------------------------------------------------

    \15\ See Notice of Filing, supra note 5, at 53469.
    \16\ Id.
---------------------------------------------------------------------------

1. Proposed Amendments to the Description of the Stress Scenarios

    First, the Proposed Rule Change would propose changes in the 
introductory paragraph of Section 4.1 to clarify that the historical 
and hypothetical market moves CMESC uses to build historical and 
hypothetical scenarios are designed to represent extreme but plausible 
market conditions. CMESC states that this clarification ensures the 
Policy language is aligned with the requirements in Rule 17ad17ad-
22(e)(4)(iii) and 17ad-22(e)(7)(i) that stress scenarios contemplate 
``extreme but plausible market conditions.'' \17\
---------------------------------------------------------------------------

    \17\ Id.
---------------------------------------------------------------------------

    Second, the Proposed Rule Change would identify ``historical'' and 
``hypothetical'' as two categories of stress scenarios in Section 4.1 
by separating them into two subparagraphs and supplementing the 
existing descriptions for each category. With respect to the historical 
category of stress scenarios, the Proposed Rule Change would clarify 
the process by which specific dates are selected and captured within 
historical scenarios, i.e., through both quantitative and qualitative 
evaluation methodologies. The Proposed Rule Change would further 
propose to retain the current reference to ``market behavior'' in the 
Policy and to remove the existing reference to ``observed and 
projected'' market behavior. CMESC states that removing the terms 
``observed and projected'' makes the distinction between historical and 
hypothetical scenarios clearer.\18\
---------------------------------------------------------------------------

    \18\ Id.
---------------------------------------------------------------------------

    With respect to the hypothetical category of stress scenarios, the 
Proposed Rule Change would amend its existing description of 
hypothetical scenarios to clarify that hypothetical scenarios will 
include theoretically driven scenarios. The Proposed Rule Change 
further clarifies that hypothetical scenarios shall not include 
potential event-driven scenarios, as event-driven scenarios are 
proposed to be reclassified and recategorized as a distinct type of 
historical scenarios pursuant to CMESC's other proposed amendments to 
Section 4.1 that are discussed in greater detail below.
    Third, the Proposed Rule Change would add new text to Section 4.1 
that describes how stress shocks applied within the stress testing 
methodology are designed to capture different interest rate 
environments. Specifically, the Proposed Rule Change would add new text 
that will explain that in order to capture the effect of different 
interest rate environments, the shocks that are calculated will be 
based upon varying return types.
    Fourth, the Proposed Rule Change would recategorize and rename the 
three existing categories of stress scenarios set forth in Table 1 
(Stress Scenario Categories as reflected in the proposed amendments) of 
the Policy into the following three categories: (i) ``Historical: Risk 
Factor Shocks'' scenarios, (ii) ``Historical: Event-Driven'' scenarios, 
and (iii) ``Hypothetical'' scenarios. Further, the Proposed Rule Change 
would change the description of the new stress scenarios in Table 1, 
discussed in greater detail below. CMESC states that these proposed 
changes to Table 1 are intended to provide greater clarity regarding 
CMESC's stress testing methodology.\19\
---------------------------------------------------------------------------

    \19\ Id.
---------------------------------------------------------------------------

Historical: Risk Factor Shocks Scenarios
    The Proposed Rule Change would make several changes to Table 1 for 
the ``Historical'' scenario category. First, the

[[Page 62582]]

Proposed Rule Change would rename the category, designated as 
``Historical: Risk Factor Shocks,'' separate from Historical Event-
Driven Shocks as described below. CMESC states that the renamed the 
Historical: Risk Factor Shocks category will include additional 
information on the risk factors considered in defining historical 
scenarios based on risk factor shocks.\20\
---------------------------------------------------------------------------

    \20\ Id.
---------------------------------------------------------------------------

    Second, the Proposed Rule Change would delete and replace the 
existing description of historical scenarios to include those based on 
a systematic application of quantitative filters across available risk 
factor curves relevant to U.S. Treasury securities, including but not 
limited to the on-the-run curve, the off-the-run curve, and the repo 
curve, over a defined lookback period. Third, the current Policy 
provides that historical dates that exhibit the largest curve movements 
are to be considered as constituting historical scenarios. The Proposed 
Rule Change would remove the term ``curve'' from the preceding 
sentence. CMESC states that the word ``curve'' is unnecessarily 
limiting given CMESC's consideration of other types of movements in 
crafting historical scenarios.\21\
---------------------------------------------------------------------------

    \21\ Id.
---------------------------------------------------------------------------

    Fourth, Table 1 of the current Policy describes the various risk 
factors that may be considered by CMESC in identifying the largest 
curvature movements for purposes of establishing historical scenarios. 
The Proposed Rule Change would include additional information regarding 
the specific risk factors considered in defining historical scenarios 
based upon risk factor shocks. Using the defined risk factor curves 
referenced above, CMESC would identify historical dates that exhibit 
the largest movements. Further, the Proposed Rule Change would 
characterize such identified historical dates as historical scenarios 
that capture three distinct types of market scenarios: (i) such 
scenarios that capture the largest upward and downward movements for 
defined tenors on the applicable curves, which would be designated as 
``individual tenor shocks''; (ii) such scenarios that capture 
structural shifts across the curves, which would be designated as 
``yield curve shape shocks''; and (iii) such scenarios that capture 
uncorrelated risk factors that are identified using Principal Component 
Analysis (``PCA''), to explain the majority of yield curve variances, 
which would be designated as ``statistical risk identification.''
    Fifth, within the yield curve shape shocks stress scenario, the 
Proposed Rule Change would make changes to identify and describe the 
types of shifts and movements that are considered across different risk 
factor curves, including parallel shifts, slope movements, and 
curvature movements.
    Sixth, the Proposed Rule Change would define the specific tenors 
for the risk factor curves that are currently being contemplated to be 
used to identify the yield curve movements, while recognizing that the 
defined tenors may change from time to time.
    Seventh, regarding the application of PCA, the Proposed Rule Change 
would make changes to highlight that CMESC identifies specific 
historical dates that have statistically extreme results for the 
defined components.
Historical: Event-Driven Scenarios
    The Proposed Rule Change would make several changes to Table 1 for 
the ``Event-Driven'' scenario category. First, the Proposed Rule Change 
would make changes to refer to event-driven scenarios as a type of 
historical scenario by renaming the event-driven scenario category as 
the ``Historical: Event-Driven'' scenario. CMESC states that the 
current Policy already accounts for this treatment of event-driven 
scenarios and already includes the consideration of historical 
scenarios designed to capture the effects of major historical event 
shocks as stress scenarios.\22\
---------------------------------------------------------------------------

    \22\ Id.
---------------------------------------------------------------------------

    Second, the Proposed Rule Change would clarify that the inclusion 
of event-driven scenarios such as significant Federal Reserve rate 
adjustments are designed to ensure that realized market dislocations 
are appropriately captured in CMESC's stress testing methodology, 
including those that fall outside the lookback period.
    Third, the Proposed Rule Change would make additional amendments 
regarding the historical nature of event-driven scenarios. CMESC states 
that these additional amendments are proposed to support readability 
and clarity without changing the construct of the scenarios 
themselves.\23\
---------------------------------------------------------------------------

    \23\ See Notice of Filing, supra note 5, at 53471.
---------------------------------------------------------------------------

Hypothetical Scenarios
    The Proposed Rule Change would make several changes to Table 1 for 
the ``Hypothetical--Principal Component Analysis (``PCA'')'' scenario 
category. First, the Proposed Rule Change would strike the reference to 
``Principal Component Analysis (`PCA')'' from the name of the scenario 
category, designating this category as ``Hypothetical.'' CMESC states 
that this change would emphasize that hypothetical scenarios are 
theoretically driven to capture potential future events with no direct 
historical precedent.\24\
---------------------------------------------------------------------------

    \24\ Id. CMESC also states that despite the term ``PCA'' being 
removed from the name of the category, PCA will continue to be used 
to determine hypothetical scenarios. Id.
---------------------------------------------------------------------------

    Second, the Proposed Rule Change would remove references that 
characterize hypothetical scenarios as being event-driven.
    Third, the Proposed Rule Change would outline in greater detail how 
CMESC will construct hypothetical scenarios, which includes using a 
systemic combination of principal components determined through PCA to 
generate a comprehensive set of extreme by plausible market shocks. 
Further, the Proposed Rule Change would make changes to specify that 
the determination of component variances will consider two business 
days of interest rate changes and detail how CMESC selects the number 
of principal components to simulate curvature shifts. The Proposed Rule 
Change would make changes to state that CMESC will ultimately create 
the scenarios derived from PCA by using a combination of PCA scores for 
the largest factors.
    Fourth, the Proposed Rule Change would further specify that CMESC 
will apply plausibility thresholds (defined at the tenor level based on 
historical data) designed to ensure the PCA-generated scenario shocks 
remain extreme but plausible.
    Fifth, the Proposed Rule Change would make changes designed to 
promote consistency across U.S. Treasury curves within the hypothetical 
scenario shocks scenario category. CMESC states that these steps are 
designed to recognize the relationships between relevant U.S. Treasury 
curves (including the repo curve) within the hypothetical scenario 
shocks, using appropriate adjustments or returns as appropriate.\25\
---------------------------------------------------------------------------

    \25\ See Notice of Filing, supra note 5, at 53471.
---------------------------------------------------------------------------

2. Proposed Amendments to the Explanation and Description of the 
Guaranty Fund

Proposed Amendments to the Explanation of Guaranty Fund Sizing
    The Proposed Rule Change would amend several footnotes located in 
Section 5 of the Policy. First, the Proposed Rule Change would amend an 
existing footnote in Section 5 of the Policy to further clarify the 
applicability of the defined term ``Member Family'' to the stress 
testing of CMESC's financial resources. Second, the Proposed Rule 
Change would add a new footnote to

[[Page 62583]]

Section 5.2.1 of the Policy. This footnote pertains to the Guaranty 
Fund sizing formula to clarify the rationale underpinning CMESC's 
selection of the number of Users (i.e., the number of User Accounts) 
that are considered in determining the cover two shortfall. The 
proposed footnote further describes that the number of Users is 
determined by CMESC's risk management team to capture the number of 
Users that may be in Default if their Member were to Default under 
extreme by plausible market conditions. CMESC states that the 
clarifying footnote reflects with what is currently provided in the 
CMESC Risk Management Framework.\26\ CMESC further states that the 
addition of this footnote to Section 5.2.1 of the Policy will serve the 
purpose of maintaining consistency and alignment across the related 
policies implementing and administering the sizing of financial 
resources and the management of credit risk exposures arising from 
potential Defaults of Member Families to CMESC.\27\
---------------------------------------------------------------------------

    \26\ Id.
    \27\ Id.
---------------------------------------------------------------------------

Proposed Amendments to the Description of Allocation of the Guaranty 
Fund
    The Proposed Rule Change would make two amendments to Section 5.2.2 
of the Policy and one amendment to Rule 402(b) regarding the 
description of the Guaranty Fund allocation.
    First, the Proposed Rule Change would make changes to clarify the 
term ``gross notional'' used in Section 5.2.2 refers to the gross 
notional of outstanding securities transactions of a Member. Second, 
the Proposed Rule Change would add a new footnote to Section 5.2.2 that 
explains that the LND component in this dual-component methodology 
aligns contributions with the tail risk (i.e., as captured by CMESC's 
stress scenarios) that each Member (including as it relates to a 
predefined number of its authorized Users) presents to CMESC. Further, 
the proposed footnote will explain that the LND component is 
complemented by the gross notional of outstanding securities 
transactions component, which is designed to ensure that each Member is 
subject to a certain level of potential mutualization risk via the 
Guaranty Fund regardless of their tail risk. The proposed footnote 
further explains that the weighting logic is designed to yield Guaranty 
Fund allocations that capture the risk of each Member and to 
incentivize active participation by Members in the close-out process in 
the event of a Participant Default. CMESC states that this weighting 
structure enhances the clarity of the Policy by providing the rationale 
for complementation and administration of the allocation of the 
Guaranty Fund.\28\
---------------------------------------------------------------------------

    \28\ Id.
---------------------------------------------------------------------------

    Third, the Proposed Rule Change would amend Rule 402(b) in two 
separate locations to clarify the intended process and methodology for 
allocating the Guaranty Fund to individual Members. Specifically, the 
Proposed Rule Change would replace both references to ``Member Family'' 
in Rule 402(b) with references to ``Member.'' CMESC states that the 
Member Family's activity is not intended to be part of the allocation 
process for individual Members.\29\ Instead, the allocation of each 
individual Member's Required Guaranty Fund Contribution is derived from 
that individual Member's own LND and that individual Member's own gross 
notional outstanding. CMESC states that this proposed amendment is 
being made to reflect the intended allocation process.\30\
---------------------------------------------------------------------------

    \29\ See Notice of Filing, supra note 5, at 53472.
    \30\ Id.
---------------------------------------------------------------------------

3. Other Minor Changes

    The Proposed Rule Change would make several other minor changes to 
the Policy. First, the Proposed Rule Change would make changes in 
Section 4.1 (Stress Scenarios) to replace the term ``two day'' period 
with the term ``two-business day'' period. Second, the Proposed Rule 
Change would make changes in Section 1 (Purpose and Statement of 
Policy) to replace the term ``present to'' with the term ``presented 
to.'' Third, the Proposed Rule Change would make technical changes in 
Section 4.2 (Review of Stress Testing Results & Methodology) by 
replacing the word ``liquidity'' with ``liquid.'' Finally, the Proposed 
Rule Change would make changes to Sectio 5.2.2 (SC Guaranty Fund 
Allocation) to replace the term ``described above'' with the term ``for 
each Member.'' CMESC states that these minor changes are designed to 
add clarity and support readability of the Policy.\31\
---------------------------------------------------------------------------

    \31\ Id.
---------------------------------------------------------------------------

IV. Discussion and Commission Findings

    Section 19(b)(2)(C) of the Act \32\ directs the Commission to 
approve a proposed rule change of a self-regulatory organization if it 
finds that such proposed rule change is consistent with the 
requirements of the Act and rules and regulations thereunder applicable 
to such organization. After carefully considering the proposed rule 
change, the Commission finds that the proposed rule change is 
consistent with the requirements of the Act and the rules and 
regulations thereunder applicable to CMESC. In particular, the 
Commission finds that the proposed rule change is consistent with 
Sections 17A(b)(3)(F) of the Act,\33\ Rule 17ad-22(e)(4)(iii),\34\ and 
Rule 17ad-22(e)(7).\35\
---------------------------------------------------------------------------

    \32\ 15 U.S.C. 78s(b)(2)(C).
    \33\ 15 U.S.C. 78q-1(b)(3)(F).
    \34\ 17 CFR 240.17ad-22(e)(4)(iii).
    \35\ 17 CFR 240.17ad-22(e)(7).
---------------------------------------------------------------------------

A. Consistency With Section 17A(b)(3)(F) of the Act

    Section 17A(b)(3)(F) of the Act requires, in part, that the rules 
of a clearing agency be designed to promote the prompt and accurate 
clearance and settlement of securities transactions and to assure the 
safeguarding of securities and funds which are in the custody or 
control of the clearing agency or for which it is responsible.\36\ The 
Proposed Rule Change is consistent with Section 17A(b)(3)(F) for the 
reasons discussed below.
---------------------------------------------------------------------------

    \36\ 15 U.S.C. 78q-1(b)(3)(F).
---------------------------------------------------------------------------

    As described above in Section III., CMESC proposes to amend the 
Policy to provide more detail to the description of how they will 
implement their stress testing methodology, enhance the clarity of the 
Policy, and clarify the intended operation of Rule 402(b). As described 
in more detail above in Section II., the Policy was established by 
CMESC to provide guidelines for monitoring, assessing, and mitigating 
risks associated with the exposures arising from Participants' 
position. Further, the Policy outlines how CMESC performs stress 
testing to estimate its exposures to Participants that could result 
from the realization of potential stress scenarios.
    By providing clearer and more comprehensive descriptions of CMESC's 
stress testing methodology and Guaranty Fund sizing and allocation 
processes, the Proposed Rule Change should help CMESC to strengthen 
CMESC's risk management documentation and support its ability to 
maintain adequate financial resources. These changes should promote the 
prompt and accurate clearance and settlement of securities transactions 
by ensuring that CMESC has appropriate policies and procedures in place 
to manage credit and liquidity risks in extreme but plausible market 
conditions. The increased transparency regarding CMESC's stress testing 
scenarios, financial resource sizing, and allocation mechanisms should 
enable market participants to better understand and

[[Page 62584]]

have greater confidence in CMESC's risk management framework, thereby 
supporting the efficiency and reliability of the clearing process. 
Moreover, the clarifications regarding how financial resources are 
sized and allocated should help to ensure the safeguarding of 
securities and funds in the custody or control of CMESC.
    Accordingly, for the reasons stated above, the proposed rule change 
is consistent with Section 17A(b)(3)(F) of the Act.\37\
---------------------------------------------------------------------------

    \37\ 15 U.S.C. 78q-1(b)(3)(F).
---------------------------------------------------------------------------

B. Consistency With Rule 17ad-22(e)(4)(iii)

    Rule 17ad-22(e)(4)(iii) under the Exchange Act requires that a 
covered clearing agency establish, implement, maintain and enforce 
written policies and procedures reasonably designed to effectively 
identify, measure, monitor, and manage its credit exposures to 
participants and those arising from its payment, clearing, and 
settlement processes by maintaining additional financial resources at a 
minimum to enable it to cover a wide range of foreseeable stress 
scenarios that include, but are not limited to, the default of the 
participant family that would potentially cause the largest aggregate 
credit exposure for the covered clearing agency in extreme but 
plausible market conditions.\38\ The Proposed Rule Change is consistent 
with Rule 17ad-22(e)(4)(iii) under the Exchange Act for the reasons 
stated below.
---------------------------------------------------------------------------

    \38\ 17 CFR 240.17ad-22(e)(4)(iii).
---------------------------------------------------------------------------

    As described above in more detail in Section II., the Policy was 
established by CMESC to provide guidelines for monitoring, assessing, 
and mitigating risks associated with the exposures arising from 
Participants' position. Further, the Policy outlines how CMESC performs 
stress testing to estimate its exposures to Participants that could 
result from the realization of potential stress scenarios. As described 
in more detail in Section III., the Proposed Rule Change provides more 
detail to the description of how CMESC will implement its stress 
testing methodology, enhances the clarity of the Policy and clarifies 
the intended operation of Rule 402(b).
    The Proposed Rule Change should help to enhance CMESC's stress 
testing documentation by providing more detailed descriptions of (i) 
the methodology for constructing and categorizing stress scenarios 
(i.e., historical risk factor shocks, historical event-drive, and 
hypothetical); (ii) how stress shocks are designed to capture different 
interest rate environments; (iii) the specific construction logic for 
historical scenarios, including individual tenor shocks, yield curve 
shape shocks, and statistical risk identification using PCA; (iv) the 
specific construction logic for hypothetical scenarios, including the 
systematic combination of principal components, application of 
plausibility thresholds, and promotion of curve consistency; and (v) 
the rationale for the cover two standard, including the determination 
of the appropriate number of Users to consider in calculating the LND 
for the two Member Families with the largest exposures.
    By clarifying and enhancing the documentation of these 
methodologies within the Policy, the Proposed Rule Change should help 
to strengthen CMESC's ability to maintain financial resources 
sufficient to cover a wide range of foreseeable stress scenarios that 
include, but are not limited to, the default of the participant family 
that would potentially cause the largest aggregate credit exposure for 
the covered clearing agency in extreme but plausible market conditions.
    Accordingly, for the reasons stated above, the proposed rule change 
is consistent with Rule 17ad-22(e)(4)(iii).\39\
---------------------------------------------------------------------------

    \39\ 17 CFR 240.17ad-22(e)(4)(iii).
---------------------------------------------------------------------------

C. Consistency With Rule 17ad-22(e)(7)

    Rule 17ad-22(e)(7) under the Exchange Act requires a covered 
clearing agency establish, implement, maintain and enforce written 
policies and procedures reasonably designed to effectively measure, 
monitor, and manage the liquidity risk that arises in or is borne by 
the covered clearing agency.\40\
---------------------------------------------------------------------------

    \40\ 17 CFR 240.17ad-22(e)(7).
---------------------------------------------------------------------------

    As discussed in Section II., CMESC uses identical stress scenarios 
for both credit stress testing and liquidity stress testing. By 
clarifying and enhancing the documentation of stress scenarios and the 
cover two standard in the manner described above in Section III., the 
Proposed Rule Change should help to strengthen CMESC's ability to 
maintain sufficient liquid resources to effect settlement of payment 
obligations with a high degree of confidence under extreme but 
plausible stress scenarios. Additionally, enhanced descriptions of 
stress scenarios should provide greater transparency regarding CMESC's 
liquidity stress testing methodology and how CMESC calculates and 
maintains liquid resources necessary to effect settlement obligations 
in extreme but plausible market conditions with a high degree of 
confidence.
    Accordingly, for the reasons stated above, the proposed rule change 
is consistent with Rule 17ad-22(e)(7).\41\
---------------------------------------------------------------------------

    \41\ 17 CFR 240.17ad-22(e)(7).
---------------------------------------------------------------------------

V. Conclusion

    On the basis of the foregoing, the Commission finds that the 
proposed rule change is consistent with the requirements of the 
Exchange Act and in particular with therequirements of Section 17A of 
the Exchange Act \42\ and the rules and regulations promulgated 
thereunder.
---------------------------------------------------------------------------

    \42\ 15 U.S.C. 78q-1.
---------------------------------------------------------------------------

    It is therefore ordered, pursuant to Section 19(b)(2) of the 
Exchange Act \43\ that proposed rule change SR-CMESC-2026-006 be, and 
hereby is, approved.\44\
---------------------------------------------------------------------------

    \43\ 15 U.S.C. 78s(b)(2).
    \44\ In approving the proposed rule change, the Commission 
considered the proposals' impact on efficiency, competition, and 
capital formation. 15 U.S.C. 78c(f).

    For the Commission, by the Division of Trading and Markets, 
pursuant to delegated authority.\45\
---------------------------------------------------------------------------

    \45\ 17 CFR 200.30-3(a)(12).
---------------------------------------------------------------------------

Sherry R. Haywood,
Assistant Secretary.
[FR Doc. 2026-20074 Filed 9-30-26; 8:45 am]
BILLING CODE 8011-01-P


</pre></body>
</html>
Indexed from Federal Register on October 1, 2026.

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.