Euronext Clearing Platform: Testing windows to prepare migration of clearing members

Clearstream¹ informs clients that as previously mentioned by the counterparty clearing house (CCP), Euronext Clearing will implement the repo and cash bonds clearing migration on

29 June 2026 and 26 October 2026

for the following markets:

• Wholesale markets:
  • Guaranteed repo trades for all euro debts; and
  • Guaranteed cash bonds trades from MTS and BrokerTec.
• Retails markets:
  • Guaranteed cash bonds trades from MOT, Access Milan, EuroTLX, Vorvel.

In preparation for the above-mentioned migration events, Euronext Clearing requires all Clearstream clients to perform mandatory testing activities before the intended migration date.

The list of markets cleared by Euronext Clearing that can be settled with Clearstream can be found under Trade Flow Hub.

Testing windows

Clients may perform testing during the following periods:

• 20–31 July 2026;
• 17–27 August 2026;
• 7–17 September 2026;
• 17–26 October 2026.

The list of ISINs supported for testing purposes with Clearstream will be included in the Euronext Clearing announcement regarding front-to-back testing.

Impact on clients

Clearing members who have already provided a Power of Attorney (PoA) to Euronext Clearing on their CBL or 6-series account do not need to take any further action other than participate in the test.

New activity: Clearing members of Euronext Clearing can grant a PoA to Euronext Clearing to settle these debts in their CBL or 6-series account. The PoA is available under CC&G.

Clearstream clients are reminded to check their fiscal certifications for the impacted markets.

For testing purposes, please complete the testing form Euronext Clearing - Clearstream Testing: PoA Initiative latest five business days before the intended start of the testing to ensure set up in the testing environment.

If you have any questions or concerns about the form, please contact connect-test@clearstream.com.

To ensure operational readiness and a smooth migration process, clients are strongly encouraged to complete the required testing activities within the above-mentioned testing windows to ensure operational readiness and a smooth migration process.

Further information

For any questions or additional information on Euronext Clearing side, clients can contact Euronext Clearing Client Readiness team via ccp-readiness@euronext.com.

For further information, clients may contact Clearstream Client Services or their Relationship Manager.

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1. Clearstream refers collectively to Clearstream Banking S.A., registered office at 42, avenue John F. Kennedy, L-1855 Luxembourg, and registered with the Luxembourg Trade and Companies Register under number B-9248, and Clearstream Europe AG (for Clearstream Europe AG clients using 6-series accounts), registered office at 61, Mergenthalerallee, 65760 Eschborn, Germany and registered in Register B of the Amtsgericht Frankfurt am Main, Germany under number HRB 7500.
Clearstream Banking S.A. is registered as an Australian CS (Overseas) Facility, under subsection 824B(2) of the Corporations Act 2001, with registration number ARBN 675 244 783.