Following the 2026 primary calibration exercise, ISDA is pleased to publish SIMM® version 2.8+2512. This version of the ISDA SIMM has updates that are based on the full recalibration of the model using historical data up to 31 December 2025.
The ISDA SIMM methodology remains a central part of the SIMM Governance Framework that ISDA SIMM users are expected to adhere to.
SIMM version 2.8+2512 has an effective date of 11 July 2026. Accordingly, SIMM users should use this version to calculate initial margin for Close of Business (COB) on Friday, 10 July 2026 onwards. The first exchange of initial margin calculated using SIMM version 2.8+2512 will therefore take place on Monday, 13 July 2026.
Documents (1) for ISDA Publishes ISDA SIMM® Methodology, Version 2.8+2512
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