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Clearing firms flummoxed by new margin models at CME, Ice

VAR-based portfolio margining is easier to manage, but harder to explain

3D rendering of black boxes covered in glowing blue question marks

Clearing firms are finding it difficult to decompose and explain the outputs of value-at-risk models used to set margin requirements for cleared energy contracts. 

The transition from standard portfolio analysis (Span) to VAR-based portfolio margining – CME made the switch in 2023, with Ice following suit in 2025 – has materially reduced margin volatility during periods of market stress, including

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