Market Forms

Every “position in VIX” is a position in a derivative or a packaged claim whose underlier is one step removed from the index tape. Naming the step is the beginning of market-structure literacy. Chapter IX names the next step: a perpetual whose underlier is versioned I_t — signed dual F, funded on the same book the analysis already studies.

The cash index

The live VIX is computed throughout the cash session from SPX option mids and disseminated as a benchmark. It can be licensed, displayed, and used as a barrier or a valuation input. It cannot be bought. Risk managers who report “VIX exposure” without specifying the instrument are reporting a slogan.

VIX futures (CFE, 2004)

Standard VIX futures (ticker VX) cash-settle to the SOQ of the VIX on their expiration Wednesday. Contract months form a curve. Mini contracts have existed and been revised; position accountability and block rules live in the CFE rulebook and are amended by CEA §5c(c) certifications. The futures market is the true wholesale market for listed U.S. equity-index volatility. Dealer hedges of notes, funds, and over-the-counter variance often pass through this curve.

Because the contract settles to a future 30-day VIX, a first-month future is not a 30-day variance swap starting today. With twenty days to VX expiry it is closer to a claim on the 30-day variance rate that will prevail in twenty days. The calendar basis is structural.

VIX options (Cboe Options, 2006)

Options on the VIX index are securities options. They are European-style with respect to the cash index and settle to the same SOQ family as the futures. They made volatility of volatility a listed claim and created the surface from which VVIX is computed. Their listing on a national securities exchange, rather than on CFE, is why a VIX call is an SEC-world instrument even though the economically linked VX future is a CFTC-world instrument.

Options on VIX futures (CFE, October 2024)

In October 2024 CFE listed options on VIX futures (UX), European-style, P.M. settled, physically delivering into the front-month VIX future, cleared at OCC, regulated by the CFTC. The product was sold as a way to take shorter-dated vol-of-vol exposure without using the securities-options complex. By 2025–2026 the exchanges were separately amending rules to permit packaged VIX future-option orders that pair a Cboe VIX option with a CFE VX future—an operational recognition that the two jurisdictional books are one economic book.

Packaged securities: ETNs, ETFs, and the roll machine

The retail and registered-fund market does not hold variance swaps. It holds notes and funds that target constant-maturity futures indices—typically a mix of first- and second-month VX contracts, rebalanced daily. VXX is the long-volatility archetype. XIV, the Credit Suisse VelocityShares Daily Inverse VIX Short-Term ETN, was the inverse archetype until its February 2018 acceleration. Inverse and leveraged products embed a daily reset that makes multi-day returns path-dependent even if the futures curve is unchanged.

The legal form of an ETN is a senior unsecured obligation. Holders have issuer credit risk in addition to index risk. The legal form of an ETF depends on the 1940 Act status and on whether the portfolio is futures (commodity-pool issues) or notes. Offering documents that describe these products as “the VIX” have been a recurring disclosure failure.

Variance futures and the incomplete migration

Cboe has listed S&P 500 variance futures (VA) as a more literal claim on realized variance. They have not displaced VX as the liquidity pool. The market revealed a preference: traders want a volatility-quoted, mean-reverting, option-rich underlier more than they want a pure variance claim. A full-distribution successor that ignores that preference will be theoretically cleaner and commercially empty.