Vol of Vol

What Is Vol of Vol?

Vol of vol (volatility of volatility) refers to the second-order measure of market uncertainty: how much implied volatility itself is expected to fluctuate. While the VIX measures the 30-day implied volatility of the S&P 500, the VVIX — published by the CBOE — measures the expected volatility of the VIX over the same horizon, derived from the prices of VIX options. In options pricing theory, vol of vol is a core parameter in stochastic volatility models (such as the Heston model), where volatility is not assumed constant but itself follows a random process. High vol of vol means the volatility regime itself is unstable and unpredictable — traders pricing options must demand larger premiums to compensate for the uncertainty about what volatility will be, causing the volatility skew and term structure to reprice in complex, non-linear ways.

Why It Matters for Traders

Vol of vol is particularly critical for options traders, volatility hedge funds, and macro managers with options overlays. When vol of vol spikes, the convexity embedded in long volatility positions becomes more valuable — options on the VIX itself can deliver outsized payoffs. For vanilla equity option books, elevated vol of vol signals that delta and vega hedges require more frequent adjustment because the underlying volatility surface is itself shifting rapidly. It also signals tail risk regime changes: historically, VVIX spikes above 120-130 have preceded or coincided with acute market dislocations. For macro traders, sustained high vol of vol often reflects genuine policy uncertainty — central bank decision ambiguity, geopolitical shocks, or liquidity crises — rather than just equity market drawdowns.

How to Read and Interpret It

The VVIX typically trades in a range of 80-110 in normal market conditions. Key interpretive thresholds:

• Below 80: Extremely low volatility-of-volatility regime; complacency risk building, common during long low-vol bull markets
• 80–110: Normal range; options markets functioning with typical two-sided uncertainty about the volatility path
• 110–130: Elevated uncertainty about the vol regime; options skew often steepens, term structure may invert
• Above 130: Crisis-level vol instability; VIX options become extremely expensive, gamma squeeze dynamics can emerge Watch the spread between VVIX and VIX: when VVIX diverges sharply higher relative to VIX, the market is pricing a vol regime shift before spot volatility has fully repriced — this is often an early warning signal.

Historical Context

During the March 2020 COVID shock, the VVIX surged to approximately 200 — nearly double its normal range — even as the VIX itself peaked near 85. This extreme reading indicated that traders had enormous uncertainty not just about equity markets but about where volatility would settle, generating massive premiums in VIX call options. A more subtle example: in August 2015, during the Chinese yuan devaluation and flash crash of August 24th, VVIX spiked above 135 roughly 10 trading days before the VIX peaked, providing an early warning of impending equity volatility for traders watching the second-order signal. Similarly, in late 2018 during Fed tightening fears, VVIX elevated persistently above 110 for weeks before the December equity selloff.

Limitations and Caveats

VVIX is derived from VIX options, which have their own liquidity constraints and positioning dynamics — it can be distorted by large institutional hedges or structured product flows rather than reflecting genuine macro uncertainty. Because VIX options are themselves thinly traded compared to equity options, the VVIX can spike on relatively small order flows. Additionally, high vol of vol does not reliably predict the direction of the next VIX move — it signals instability, not whether volatility will spike or collapse.

What to Watch

Monitor the VVIX/VIX ratio daily — a ratio above 2.5x often signals non-linear volatility dynamics. Track open interest in VIX calls, particularly in near-term expiries, as concentrated positioning can temporarily distort VVIX readings. During options expiry windows, vol of vol typically compresses as uncertainty resolves; persistent post-expiry elevation is more meaningful.