How is a curve flattener trade structured?

Question

AcadiFi · Accepted Answer

A flattener profits when the spread between long and short yields narrows. Construction mirrors the steepener: short the short-duration bond, long the long-duration bond, duration-neutral.

For Copperline Asset Management expecting a bull flattener (long rates falling faster than short rates, often post-Fed-peak): short 2-year notes, long 10-year notes. Size to duration-neutral.

Example: buy $30M face 10y Treasury (duration 8.5), duration exposure = $255M. Short $30M × 8.5 / 1.9 = $134.2M face 2-year. Net initial duration ≈ 0.

Scenario — curve flattens 20bp (10y falls 20bp, 2y unchanged): Long 10y gains $30M × 8.5 × 20bp = $510,000. Short 2y zero P&L. Net profit $510,000.

Alternative scenarios:
- Bull flattener (both fall, long falls more): long 10y gains more than short 2y loses — profit.
- Bear flattener (both rise, short rises more): short 2y gains more than long 10y loses — profit.
- Bear steepener (long rises more): LOSS.
- Bull steepener (short falls more): LOSS.

Carry considerations: in a positively sloped curve, flattener carries positive — long end earns more yield than short end costs. The trade pays to wait. In an inverted curve, carry is negative — you'd pay more on 10y financing than you earn on 2y short position.

Sizing pitfalls: use DV01 neutrality more precisely than duration-neutrality, especially across swaps vs Treasuries or futures contracts with different conventions. For on-the-run vs off-the-run trades, consider liquidity premia. Execute via Treasury futures (ZT for 2y, ZN for 10y), swap spreads, or cash bonds.

How is a curve flattener trade structured?

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