VIX and Volatility Products
An index measuring expected volatility over the next thirty days. It cannot be held directly, and the products referencing it behave differently from the index.
MadStockAlerts Research · Updated August 29, 2026
What to take away
- VIX is computed from index option prices, not from historical volatility.
- It cannot be bought; only futures and products on those futures can be.
- The VIX futures curve is usually in contango, which produces a persistent drag.
- Volatility spikes are sharp and mean-revert quickly.
- Inverse volatility products have failed abruptly and completely.
MAD Academy Training Video · 0:45
You Cannot Buy the Index
VIX is a calculation, not a tradable asset, so every product tracking it holds futures — and inherits their roll cost.
This lesson is part of a Stock Alerts + Tools plan.
What the index measures
VIX is calculated from the prices of a wide range of index options, expressing the market-implied expectation of volatility over the coming thirty days as an annualised percentage. It is forward-looking by construction and is not computed from past returns.
It is strongly negatively correlated with the equity index it references, because demand for downside protection rises when the market falls. That relationship is the source of its description as a fear gauge, which is a reasonable shorthand and not what it measures.
A level of 20 implies an annualised expected volatility of 20 percent, which corresponds to a daily move of roughly 1.25 percent. Converting the level into a daily figure makes it considerably more interpretable.
Why it cannot be held
The index is a calculation rather than a portfolio, so there is nothing to buy. Exposure is obtained through VIX futures, and through products holding those futures, which is where the divergence begins.
| The index | A futures-based product | |
|---|---|---|
| What it is | A calculation from option prices | A holding of futures contracts, rolled |
| Roll cost | None | Substantial when the curve is in contango |
| Behaviour in a spike | Rises sharply | Rises, and generally less than the index |
| Behaviour over time | Mean-reverting around a level | Decays, sometimes to near nothing |
The last row is why long volatility products have lost the overwhelming majority of their value over multi-year periods despite the index oscillating around a stable level. The decay is the roll, compounded.
Scroll the chart sideways to see all of it.
- VIX index level
- Long volatility product
The shape of the curve
VIX futures are usually in contango: later contracts price above the spot index, because volatility is low most of the time and expected to normalise upward. That shape produces a continuous cost for anyone holding long exposure.
In stress the curve inverts, with the front contract above the later ones, reflecting an expectation that current elevated volatility will subside. That inversion is itself watched as a stress indicator.
The persistent contango is the reason short volatility positions were profitable for extended periods. They were collecting the roll, and the risk was concentrated entirely in the events when the curve inverted.
The inverse products
Products providing inverse exposure to VIX futures collected that roll and performed extremely well for several years. In February 2018 a single-day spike in volatility caused at least one of them to lose the overwhelming majority of its value in one session, triggering termination provisions.
- The loss was a mechanical consequence of the product's design rather than a failure of execution.
- The terms permitting termination on such a move were disclosed in the prospectus.
- The return profile beforehand was steady gains with a catastrophic tail, which is the profile described in the risk-adjusted return article.
- Holders had access to every one of these facts in advance.
This is the clearest available case study of a strategy whose historical record looked exceptional precisely because the risk had not yet occurred. Nothing here is a comment on any current product; it is a description of a documented event and its mechanism.
What the term structure is used for
Beyond the level, the shape of the VIX futures curve is watched as a positioning and conditions indicator, and it changes shape faster than most market measures.
| Shape | Conventional reading |
|---|---|
| Steep contango | Calm conditions, and an expensive carry for long volatility exposure |
| Flat | Uncertainty rising, and the carry disappearing |
| Inverted | Stress. Current volatility is elevated and expected to subside |
| Deeply inverted | Acute stress, and historically short-lived |
The transition between the first and third rows can happen within a session, which is unusual: most term structures in most markets move slowly, and this one can reverse completely in hours.
That speed is why strategies built on the carry are so exposed. The condition producing the carry and the condition destroying it are separated by a single day's move rather than by a gradual transition.