What is a constant maturity CDS (CMCDS) and how does it differ from standard CDS?

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AcadiFi · Accepted Answer

A constant maturity CDS (CMCDS) pays a floating spread that periodically resets to the then-current market spread for a reference maturity (typically 5 years), multiplied by a participation rate. This contrasts with standard CDS where the premium is fixed at inception for the contract life.

Consider Whitbridge Insurance selling 10-year CMCDS protection on Pinehurst Energy with a 5-year reference maturity and 80% participation rate. Every quarter, the CMCDS spread resets to 80% × current 5-year CDS spread on Pinehurst. If 5-year spread is 150 bps today, Whitbridge receives 120 bps × notional. In three months if spread widens to 220 bps, the CMCDS premium resets to 176 bps for the next quarter.

The participation rate (often 70-90%) reflects convexity and the expected slope of the credit curve. Calculating the fair participation rate requires modeling the forward credit curve and its volatility — similar to constant maturity swaps in rates markets.

CMCDS serves distinct investment purposes: (1) investors wanting exposure to credit spread changes rather than absolute default risk get rolling exposure to current market pricing; (2) natural hedge for institutions whose liabilities are linked to credit spreads (insurance, synthetic CDO management); (3) view expression — CMCDS protection buyer benefits if spreads systematically widen faster than the forward curve predicts. Standard CDS vs CMCDS trades express convexity views on the credit curve.

Liquidity is significantly thinner than standard CDS. CMCDS are mostly traded OTC between sophisticated institutions. CFA Level III covers these as examples of path-dependent credit derivatives.

What is a constant maturity CDS (CMCDS) and how does it differ from standard CDS?

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