Treasury selloff creates switch-option trade chance

A prolonged selloff in U.S. Treasuries has pushed long-term yields above 5%, increasing volatility in the Treasury futures market and opening opportunities for hedge funds and relative-value traders to pursue switch-option arbitrage.

In the Treasury basis trade, traders short futures contracts while buying the cash bond designated as the cheapest to deliver, or CTD. The switch option is the extra source of return that appears if the CTD is reclassified to a different security, allowing traders to capture the resulting price gap between the futures and cash markets.

This week’s heavy corporate bond issuance coincided with a 20-year Treasury auction and a sale of long-dated inflation-protected securities, adding pressure at the long end of the curve and helping push 30-year yields to their highest levels since 2007.

Market data indicate that a further 10 basis-point rise in long-term yields could move the CTD from the August 2045 4.875% issue to the February 2046 2.5% note. A 30 basis-point increase could shift the CTD to the August 2049 2.25% bond.

Barclays strategists Andres Mok and Amrut Nashikkar have highlighted growing switch risk with long-end yields above 5%, noting a large selloff tends to push the CTD further out in the allowed delivery basket while a sustained rally tends to move it back toward shorter eligible issues.

The strategy involves operational and market risks. Transaction costs and the precise timing required to execute a switch can reduce returns. When the CTD changes, futures traders typically adjust hedge ratios, which can require additional buying or selling of futures contracts and may amplify market moves.

Other factors adding uncertainty include the Federal Reserve’s policy outlook and higher oil prices, both of which can affect inflation expectations and longer-term rates. Because futures delivery rules allow several eligible bonds in the delivery basket, sharp yield movements can alter the eligible-security mix and complicate hedging for large relative-value desks.

Treasury futures permit delivery of any eligible bond at settlement; the CTD is the bond that is cheapest to deliver to a short position after accounting for conversion factors. Switch-option arbitrage seeks to exploit price differences between the futures and cash markets and the potential profit when the identity of the CTD changes.