When realised vol spikes but the wing stays quiet
A regime-assessment pattern we see on single-name options after a sharp realised move.
Single-name options books often face a familiar mismatch: realised volatility jumps after a corporate surprise, yet the wing of the implied surface does not reprice with the same urgency as the front-end belly. Traders ask whether the quiet wing is an opportunity, a warning, or simply slow.
What we measure first
In a regime assessment we compare three histories on the same chart set:
- Front-month implied versus 10- and 20-day realised
- 25-delta risk reversals before and after the event
- Wing ratios against the two prior stress episodes for that name
If the wing is quiet while realised has already mean-reverted in the first few sessions, the surface may already have done most of its work in the near tenors. If realised remains elevated and the wing is still cheap versus prior stress, the assessment flags that mismatch explicitly — without converting it into a trade ticket.
Conversations that help
The useful client question is rarely “is vol cheap?” It is “which part of the surface still disagrees with the hedge we are allowed to hold?” That question keeps the assessment tied to constraints rather than to abstract fair value.
Delivery shape
Most of these assessments land as an eight-to-twelve-page equivalent brief plus a walkthrough call. Charts go in an appendix so the main narrative stays readable in a risk meeting.