What is a credit spread option, and how does it differ from a credit default swap for hedging credit risk?
CFA Level II mentions credit spread options as a credit derivative. I understand CDS pays on default events, but a credit spread option seems to pay based on spread changes, even without a default. How does this work, and when would a portfolio manager prefer it over CDS?
Credit spread options are a nuanced credit derivative that provides protection against spread widening — a much broader and more common event than outright default. This makes them particularly useful for mark-to-market hedging.
What a Credit Spread Option Is:
A credit spread option gives the holder the right (not obligation) to buy or sell protection at a predetermined spread level.
Credit Spread Put (Most Common for Hedging):
- Pays off when the credit spread WIDENS beyond the strike spread
- Payoff = max(0, Spread at Expiry - Strike Spread) x Duration x Notional
- Analogous to a put option on the bond price (wider spreads = lower prices)
Credit Spread Call:
- Pays off when the credit spread NARROWS below the strike spread
- Used for speculating on credit improvement
CDS vs. Credit Spread Option:
| Feature | CDS | Credit Spread Option |
|---|---|---|
| Trigger | Credit event (default, restructuring) | Spread exceeding strike |
| Pays for mark-to-market losses | No (only on default) | Yes |
| Protection level | Binary (par minus recovery) | Graduated (spread-based) |
| Cost structure | Ongoing premium payments | Upfront option premium |
| Maximum payout | Par minus recovery | Unlimited (spread can widen massively) |
| Counterparty risk | Present but manageable | Present |
Worked Example:
Granite Capital holds $50M of Silverline Corp senior unsecured bonds trading at a spread of 180 bps to Treasuries (duration = 6 years).
They buy a credit spread put with:
- Strike spread: 250 bps
- Expiry: 6 months
- Premium: 45 bps upfront (0.45% x $50M = $225,000)
- Notional: $50M
Scenario A: Spread widens to 400 bps
- Payoff = (400 - 250) x 6 x $50M / 10,000 = 150 x 6 x $50M / 10,000 = $4.5M
- Bond portfolio loss ≈ (400 - 180) x 6 x $50M / 10,000 = $6.6M
- Net loss after hedge: $6.6M - $4.5M + $0.225M = $2.325M (65% reduction)
Scenario B: Spread narrows to 120 bps
- Payoff = $0 (spread below strike, option expires worthless)
- Bond portfolio gain ≈ (180 - 120) x 6 x $50M / 10,000 = $1.8M
- Net gain: $1.8M - $0.225M = $1.575M (still participate in most of the tightening)
When to Prefer Credit Spread Options Over CDS:
- Mark-to-market mandated: Trading books require daily P&L hedging, not just default protection
- Spread volatility without default: Investment-grade credits rarely default but experience significant spread moves
- Cost efficiency: One upfront payment vs. ongoing CDS premiums
- Partial hedge desired: Options provide asymmetric protection (participate in tightening, hedged on widening)
- Event-specific hedging: Protect against a specific risk event (earnings, regulatory decision) over a short period
Exam Tip: Know the payoff formula (spread difference x duration x notional), understand the key advantage over CDS (pays on spread moves, not just default), and be able to calculate the effectiveness of the hedge in a scenario.
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