Clearing House Tweaks Default-Protection Math for Swaps
Published Date: 5/29/2026
Notice
Summary
LCH SA, a big player in clearing credit default swaps, is updating its risk rules to better protect against member defaults. This change affects all clearing members who now have clearer guidelines on how much money they need to put up to cover risks. The new rules kick in soon and help keep the whole system safer without costing extra money right away.
Analyzed Economic Effects
6 provisions identified: 5 benefits, 1 costs, 0 mixed.
Default Fund Size Falls ~41%
If you are a clearing member at LCH SA, the Default Fund size was recalibrated and LCH SA reports an average 41% decrease in the Default Fund over the 12-month period leading into March 2026, with observed decreases between 32% and 44%. LCH SA says it will continue to meet the regulatorily required "cover-2" standard.
Smallest Members Still Face €10M Floor
If you are one of LCH SA's smallest clearing members, your Default Fund contribution would not decrease because those members remain subject to a €10,000,000 contribution floor. Small members therefore would not receive the percentage decreases reported for larger members.
Spread Margin Lookback Moves To 10 Years
LCH SA will change how it calculates Spread Margin: it will use a fixed 10-year rolling lookback (updated daily) and also separately consider a fixed stressed period covering July 2007 through June 2010, reviewed annually. These changes alter the historical sample used to simulate losses for initial margin calculations.
Volatility Weighting Cut From 50% To 25%
When rescaling past returns, LCH SA will reduce the weight given to current volatility from 50% to 25% (with 75% weight on past-date volatility) as part of the Expected Shortfall calculation. LCH SA says this change aims to reduce procyclicality in margin calculations.
Spread Margin Floor: ES Replaced by VaR
LCH SA will replace the Spread Margin floor calculation from an unscaled Expected Shortfall measure to an unscaled Value‑at‑Risk (VaR) measure. LCH SA says this simplification should allow the main, scaled model to drive margins more often and align with market practice.
Stress Tests: Seven‑Day Holding Period and Five‑Day P&L
LCH SA will set the stress test holding period to seven days for all scenarios and will specify that Expected Shortfall P&L is calculated at the five‑day P&L per scenario. LCH SA says these changes standardize stress testing and align calculations with regulatory timeframes.
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