CNS Transformation
DTCC is executing a multi-year transformation to deliver innovative, modular systems that improve workflows and support straight-through processing. The CNS Transformation is part of NSCC’s broader efforts and commitment to support an evolving market structure.
To identify the functional impact, understand timelines and sequencing, and align internal planning, review the following DTCC Transformation Resources:
Review the CNS Transformation important notices, including A9742 and A9795.
CNS Client Regression Testing
- PSE (Client Test): August 24, 2026
- Complete Client Regression Testing: October 9, 2026
- Production: November 2026
Click each tab to prepare, test, and sign-off on CNS client regression testing in the PSE (Client Test) environment.
To prepare for the current CNS Client Regression testing, perform the following tests in the PSE-U (Test) environment:
- Confirm message integrity, sequencing, and continuity for CNS machine readable input and output files.
- Verify retrieval through the current DTCC connectivity platform. No connectivity changes are required.
- Submit Exemption and Priority files to NSCC.
- Test CNS Intraday ISO15022 in the PSE (Test) environment (Subscribed Members).
- Review known CNS issues, defects, and available workarounds to help you prepare for testing activities.
CNS Issues and Defect Log
Members are not required to attest to print image and CSV reports in our PSE environment until a later date as noted in the A9795 important notice. Participants should, however, ensure that they obtain and have access to the Securities Data Experiences (SDX) service in preparation for future validation of the CSV outputs. This helps to make sure workflows remain uninterrupted after the legacy outputs are retired.
View the new CSV report layouts that are replacing the print image outputs. These reports will be available in CSV format through the Securities Data Experiences (SDX) service in the MyDTCC portal. Access requires provisioning by your firm's Super Access Coordinator (SAC). For more information, see the Securities Data Experiences User Help available on the Securities Data Experiences (SDX) page.
Note: DTCC expects to retire CNS print image outputs at the same time as the planned decommissioning of existing CNS MRO outputs in 2028.
Log in, if necessary, to access CNS resources.
Upcoming Release: CNS Account Summary
Upcoming Release: CNS Buy-In Confirmed
Upcoming Release: CNS Buy-In Liability
Upcoming Release: CNS Day Cycle Cash Reconciliation Statement
Upcoming Release: CNS Night Cycle Cash Reconciliation Statement
Upcoming Release: CNS Day Miscellaneous Activity
Upcoming Release: CNS Night Miscellaneous Activity
Upcoming Release: CNS Projection
Upcoming Release: CNS Position Prior to Day Cycle
Upcoming Release: CNS Position Prior to Night Cycle
Upcoming Release: CNS Receive & Deliver Instructions
Upcoming Release: CNS Day Settlement Activity
Upcoming Release: CNS Night Settlement Activity
By October 9, 2026, all members are encouraged to complete regression testing and confirm data continuity for existing CNS MRO reports and the MT570 Intraday Position Change message, if applicable. Members can provide attestation by emailing
If no attestation or issue notification is received by October 9, 2026, DTCC will assume your firm has successfully completed testing, validated data continuity, and is operationally ready for implementation with no outstanding issues.
If your firm identifies any issues, discrepancies, or concerns during testing, you must provide a brief description of the issues to
CNS Functional Testing
- PSE (Client Test): Q2 2027
- Production: Q3 2028
To prepare for upcoming CNS Functional Testing, review the Client Test Plan.
Clearing & Settlement Transformation: Client Test Plan
Transformation Insight Series
Gain insight into upcoming CNS key milestones and client readiness activities to help your firm prepare for the Transformation initiative changes.
DTCC Transformation Insight Series: Equities Clearing Testing
Transformation Integration Series
Hear the latest Equities Clearing Transformation updates from DTCC subject matter experts, including testing, connectivity, and readiness activities. These sessions include client questions and answers from the live forum.
DTCC Transformation Integration: Clearing Defect Log & Testing Office Hours