Five Against Bond Spread (FAB)

The strategy focuses on two parts of the Treasury yield curve. Five-year notes and long-term bonds respond to some common forces, but their yields and futures prices need not move by equal amounts.

A spread position seeks to benefit from that difference rather than only from the direction of interest rates overall, and either orientation is possible: buy the note futures and sell the bond futures, or reverse the positions. The chosen direction must match the expected relative-price movement.

Bond prices generally move inversely to yields, which complicates casual descriptions of the trade, since saying that one yield will rise more than another is not the same as saying that its futures price will rise more. Identify the actual long and short contracts before interpreting a gain or loss.

The long-term side usually has greater interest-rate sensitivity per unit of principal than a shorter-maturity instrument, so equal contract counts do not necessarily create an interest-rate-neutral spread. Position sizes depend on the contracts and targeted risk measure.

A trader may use each contract's sensitivity to a small yield change to choose a hedge ratio, but that ratio is an estimate rather than a permanent constant, and deliverable securities, conversion factors and market conditions can change the behaviour of Treasury futures. An apparently balanced spread can retain exposure to a broad rate move, and it also faces changes in curve shape and differences between the futures and relevant cash securities.

Offset positions reduce some exposures but do not make the combined trade risk-free. The trade differs from a calendar spread, which ordinarily compares delivery months for the same underlying contract, while FAB compares different Treasury maturity sectors, and contract expiration dates still need attention although they are not the defining difference between the two legs.

FAB also differs from a Five Against Note spread, which uses the five-year note and ten-year note futures, because the long-term bond leg is what distinguishes FAB, so abbreviations should be checked carefully since a similar name can describe a different maturity relationship. Futures require margin and produce gains or losses as prices change, so a spread can need additional cash even if its longer-term view eventually proves correct.

The business must assess liquidity needs rather than assuming that opposite positions eliminate margin pressure. Execution can create temporary imbalance, since if one leg fills and the other does not the trader can briefly hold an outright position, so orders, trading size and market liquidity matter alongside the expected yield-curve movement.

Historical spread behaviour is not a guarantee of mean reversion, because economic expectations, inflation, policy and demand for different maturities can change the relationship, and a price difference that looks unusual against old data can persist or widen further. For a non-finance manager, ask which contracts are bought and sold, why those sectors should move differently and how the size ratio was determined, request stress tests for a parallel rate move, an adverse curve change and additional margin, and remember that the label describes a pair of positions, not a promised return.