What is a blended rate swaption and when would a corporate treasurer use one?

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AcadiFi · Accepted Answer

A blended rate swaption (sometimes called a 'mid-market' or 'combination' swaption) gives the holder the right to enter a swap at a specified blended fixed rate that reflects a combination of current market rates and a predetermined hedge level. It's structured to smooth hedge execution for corporates with uncertain future borrowing dates.

Tradewind Logistics expects to issue $200M in 10-year bonds sometime between 6 and 18 months from today. Management wants to lock in today's 10Y rate of 4.65% but doesn't know exactly when issuance will occur. A standard forward-starting swap locks a single date; a blended swaption covers a window.

Tradewind buys a blended swaption from Orrington Capital with:
- Exercise window: months 6–18
- Strike: 4.65% (today's 10Y rate)
- Premium: 65bp × $200M = $1.3M
- Notional: $200M, 10Y tenor starting at exercise date

At issuance date (say month 11), if 10Y swap rate is 5.20%, Tradewind exercises, entering pay-fixed swap at 4.65% — saving 55bp × $200M × annuity ≈ $8.8M NPV.

If rates fell to 4.10%, Tradewind lets it expire and hedges spot at 4.10%, losing only the $1.3M premium.

```mermaid
flowchart LR
  A[Buy blended swaption] --> B[Window 6-18 months]
  B --> C{Rates at issuance?}
  C -->|Above strike| D[Exercise at 4.65%]
  C -->|Below strike| E[Let expire, hedge spot]
```

Use cases: capital project financings with uncertain drawdown timing, M&A deal financings contingent on closing, and bond takedowns with flexible pricing dates.

What is a blended rate swaption and when would a corporate treasurer use one?

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