Asset Swap

An asset swap is a transaction that combines the purchase of a fixed-rate bond with an interest rate swap, so that the investor exchanges the bond's fixed coupons for floating-rate payments plus a spread. The result behaves like a floating rate note: the investor keeps the bond's credit risk but largely removes its interest rate risk. The extra margin over the floating benchmark is called the asset swap spread.

Asset swaps are used mainly by banks, insurers and other institutional investors that fund themselves at floating rates or want exposure to an issuer's credit without taking a view on rates. The asset swap spread is also a widely used measure of a bond's credit spread, compared with spreads on credit default swaps. The term has nothing to do with atomic swaps in crypto, which exchange tokens between blockchains.

Suppose you lend money to a company at a fixed 5% a year, but your own savings account pays a rate that goes up and down. If rates rise, your fixed 5% looks worse and the loan is worth less. An asset swap is like making a side deal with a bank: you hand the bank your fixed 5%, and the bank pays you the going floating rate plus a little extra.

Now your income moves with interest rates, just like your costs. What you are really left with is the risk that the company fails to pay, which is the risk you wanted in the first place. The "little extra" you receive is the reward for that risk.

In a typical par asset swap:

1. Bond purchase. The investor buys a fixed-rate bond, often a corporate bond, from the swap dealer for par (100), whatever its market price.
2. Fixed leg. The investor pays the bond's fixed coupons to the dealer over the life of the swap.
3. Floating leg. The dealer pays the investor a floating rate, now usually based on SOFR in US dollars after the retirement of LIBOR, plus the asset swap spread, on the swap's notional amount.
4. Upfront adjustment. Because the bond is exchanged at par, the difference between par and its market price is built into the spread.

In a market-value asset swap, the bond is bought at its market price and the notional amount is set accordingly. The investor still owns the bond; if the issuer defaults, the swap continues and must be unwound, so the investor bears the loss.

For a bond priced at par, a simple approximation is:

• $\text{ASW}$ is the asset swap spread over the floating benchmark.
• $C$ is the bond's annual coupon rate.
• $S$ is the market swap rate for the same maturity.

If a five-year bond pays a 5.2% coupon and trades at par while the five-year swap rate is 4.0%, the asset swap spread is about 1.2%, or 120 basis points over the floating rate. A bond trading below par has a wider spread, because the investor also gains the discount. Analysts compare asset swap spreads across issuers and with CDS spreads; the difference between the two, known as the CDS-bond basis, signals relative value or funding pressures.

• Asset-liability matching. Banks funded at floating rates convert fixed-rate bonds into floating income.
• Credit investing. Investors take an issuer's credit risk with little rate exposure.
• Relative value. Traders compare bond and CDS markets or bonds of the same issuer at different maturities.
• Accounting. Asset swaps can qualify for hedge accounting, reducing volatility in reported earnings.
• Convertible bonds. In convertible asset swaps, hedge funds keep the equity option in a convertible bond and sell the credit component to other investors.

Asset swaps remove most rate risk but add others. If the issuer defaults, the investor loses on the bond and still faces the swap, whose value may be positive or negative. The swap introduces counterparty risk with the dealer, reduced in practice by collateral and central clearing. Liquidity can dry up in stressed markets, widening spreads and creating mark-to-market losses. The transition from LIBOR to risk-free reference rates required many older asset swaps to be amended, a reminder that benchmark changes can affect long-dated contracts.