Understanding P&L in Risk Reversal Strategies

Option P&L attribution is an important component of portfolio and risk management. We have previously discussed related topics, including how option P&L is path-dependent. Reference [1] examines P&L attribution and, specifically, the sources of P&L in a risk-reversal position, a structure commonly used to express a view on volatility skew.

The author investigates the problem both within a formal framework and empirically, using 886 SPY risk reversal trades from 2020–2026, marked daily. An equal-delta risk reversal consists of a long position in one OTM wing and a short position in the other at equal absolute deltas, with the overall position delta-hedged.

The author pointed out,

…The frame is natural: the risk reversal is the canonical vanna-bearing structure, and vanna is how the vanna–volga pricing tradition prices the smile’s slope. This paper argues the frame inverts the economics of the delta-matched, hedged version of the trade. Deriving the structure’s Greeks from first principles and reconciling a five-year, 886-trade tape’s P&L into Greek buckets—exactly, so the decomposition is confirmed rather than fitted—we find that the money is made by differential vega applied to skew mean-reversion, that the vanna term is a structural cost whose sign is pinned by the leverage effect, and that the two facts are connected by an impossibility result: the vanna cannot be removed with the structure’s own legs, at any positive weighting.

In short, the paper finds that the P&L comes from differential vega applied to skew mean reversion, while vanna is a structural cost. Furthermore, vanna cannot be eliminated using just the two option legs.

This is an interesting paper that [glossary_exclude]warrants [/glossary_exclude]further investigation. Several questions remain worth exploring. For example,

• Can other structures be used in which vanna is not a cost?
• And what happens when the spot-volatility correlation changes sign, as it has done recently?

Let us know what you think in the comments below or in the discussion forum.

References

[1] Charlie Yan, A Formal Theory of the Delta-Matched Risk Reversal: Slope Vega, Irreducible Vanna, and a Dollar-Reconciling Attribution, Working paper 2026.

Originally Published Here: Understanding P&L in Risk Reversal Strategies

source https://harbourfronts.com/understanding-pl-risk-reversal-strategies/