VIX ETFs let investors trade market volatility itself rather than individual stocks, tracking VIX futures indexes tied to the Cboe's so called fear gauge, though the products carry outsized risks that have wiped out entire funds in a single bad stretch.
What the VIX Actually Measures
The VIX, formally the Cboe Volatility Index, comes from the Chicago based Cboe Global Markets. It pulls implied volatility readings out of S&P 500 index option prices and boils them down to a single number meant to reflect what traders expect volatility to look like over the next 30 days. When stock prices tumble, the VIX tends to jump, often by a lot more than the stock move itself would suggest. That relationship is why traders nicknamed it the fear index: it rises when confidence falls and settles when markets calm down.
Cboe built out a whole suite around this idea, including VIX options and VIX futures, so traders could bet on volatility directly instead of just watching it. That demand for direct exposure eventually spilled into the ETF world, giving rise to a niche but heavily traded corner of the market built entirely around swings in fear and calm.
How VIX ETFs Actually Work
Here is the part that trips people up: you cannot buy the VIX itself through an ETF. There is no direct way to own it. Instead, VIX ETFs track VIX futures indexes, and most of them are technically exchange traded notes rather than true ETFs, meaning they carry counterparty risk tied to the bank that issued them. That is usually a minor concern for everyday investors, but it is worth knowing the structure differs from a typical stock ETF.
The iPath S&P 500 VIX Short Term Futures ETN, ticker VXX, is one of the best known names in the space. It holds long positions in the first and second month VIX futures contracts and rolls those positions daily. Because volatility tends to drift back toward its historical average over time, VXX often trades higher than you would expect during quiet, low volatility stretches.
Then there are inverse VIX ETFs, built to profit when volatility falls rather than rises. These can act as a cushion during turbulent markets since stocks and the VIX typically move in opposite directions. The ProShares Short VIX Short Term Futures ETF, ticker SVXY, is a well known example. It tracks VIX short term futures with 0.5x inverse exposure, so it is not leveraged. SVXY had a standout 2017, returning 181.84%. Then 2018 arrived, and through mid July the fund had lost 91.75%, a brutal reminder of how fast these trades can turn.
Other inverse products lean on S&P 500 VIX mid term futures instead. The now delisted VelocityShares Daily Inverse VIX Medium Term ETN, ticker ZIV, gained almost 90% in 2017 running that same playbook.
Why These Funds Can Blow Up Fast
Early in 2018 the VIX spiked 115%, an enormous move that gutted funds shorting VIX futures. Two products, the VelocityShares Daily Inverse VIX Short Term ETN and the VelocityShares Daily Inverse VIX Medium Term ETN, ended up shutting down entirely in 2020, a casualty in part of that earlier volatility shock.
Part of the problem is that the VIX measures implied volatility, which is really just a reflection of what investors are willing to pay for S&P 500 options, not a direct read on actual market swings. VIX ETFs then try to mirror an index built on futures contracts tied to that implied number, and the tracking gets sloppy fast. One month ETN proxies typically capture only about 25% to 50% of the VIX's actual daily moves, and mid term products tend to track even worse.
There is also a structural drag built into these funds. VIX futures curves tend to work against long term holders, causing steady value decay as expiring contracts get rolled into new ones. Each roll chips away a bit more, and that repeated erosion is a big reason most VIX ETFs lose money if held for a long stretch, regardless of which direction volatility eventually moves.
Weighing the Risk Before Trading Volatility
Inverse volatility ETFs are the riskiest corner of this category. A single sharp volatility spike can gut a fund's value almost overnight, which is exactly what happened in 2018. These are not products for someone unfamiliar with how volatility behaves or unwilling to watch a position closely. Anyone considering an inverse VIX ETF should look carefully at who manages the fund and how it is structured before putting money in.
Because of the decay problem and the potential for sudden, severe losses, VIX ETFs generally fit better as short term, tactical trades than as buy and hold investments. Many are highly liquid, which makes them useful for traders looking to speculate over hours or days rather than years. Held carefully and for brief windows, they can generate real gains. Held carelessly or for too long, the math tends to work against the investor.