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Dealer Flow
Why a Vol Crush Triggers a Vanna Bounce
It’s one of the market’s most repeatable post-event moves: the scare passes, volatility collapses, and the market—counterintuitively—rips higher. Vanna is why.
NoVo Options Trading · 2026
After a catalyst passes, implied volatility collapses (the vol crush) — and in a short-vanna regime, that falling IV forces dealers to buy, sparking a bounce or rally. It links two concepts most traders learn separately.
The two-step mechanism
Step 1 — the crush: before an event (FOMC, CPI), IV is elevated pricing the uncertainty; once the event passes and uncertainty resolves, IV collapses. Step 2 — the vanna response: that falling IV changes dealers’ deltas via vanna, and in the common short-vanna setup they must buy to re-hedge — lifting price (a post-event bounce).
Why it’s self-reinforcing
The buying calms vol further, which forces more vanna buying — a loop that can turn a relief bounce into a sustained vanna rally. It’s why markets so often rally after a feared event even when the news wasn’t especially good: the mechanical vol-crush-to-vanna flow does the lifting.
The scare passing is bullish not because the news was good, but because the fear premium deflating forces dealers to buy. Vol crush is the fuse; vanna is the rocket.
What it means for a scalper
Expect a potential vanna bounce after a feared catalyst resolves with IV collapsing — don’t reflexively fade the relief rally, since it’s mechanically supported. Recognize the setup (event passed, VIX dropping) and respect the upward bias. It’s one of the cleaner dealer-flow patterns to know.
More on this: What Is the Term Structure of Volatility? · What Is Vol of Vol? The Volatility of Volatility
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NoVo is a software tool for market analysis and for executing trades you initiate, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.