How do options on credit indices (credit index options) work?

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AcadiFi · Accepted Answer

Credit index options give the holder the right, but not obligation, to enter into a CDS index position at a predetermined spread (strike). They come in two flavors: payer options (right to BUY protection at the strike spread — profits when spreads widen) and receiver options (right to SELL protection at the strike spread — profits when spreads tighten).

For example, Ardent Global Macro Fund buys a 3-month payer option on CDX.NA.IG with strike 80 bps, paying an upfront premium of 15 bps × $100M notional = $150K. At expiry, if CDX trades at 130 bps, Ardent exercises and enters a 5-year CDS index position buying protection at 80 bps — immediately worth approximately 50 bps × duration × notional in mark-to-market gain. If CDX is at 70 bps (tighter than strike), the option expires worthless.

Key differences from equity options: (1) underlying is a credit spread, not a price, so payoff is (spread − strike) × risky duration × notional; (2) options are typically European-style; (3) 'knockout' features often exist — if a credit event occurs before expiry, options may terminate with specific cash settlement; (4) volatility is quoted in basis points (normal volatility) rather than percentage.

Users include: macro hedge funds expressing directional credit views with convex payoffs, portfolio managers buying cheap tail hedges, banks hedging warehouse risk in syndicated loans. Pricing uses a modified Black model with credit spread dynamics. Implied volatility of credit options reveals market expectations for credit market stress. The CDX option market is relatively deep for on-the-run indices, thinner for single-name CDS options.

How do options on credit indices (credit index options) work?

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