Volatility Trading: How It Works, How It Blows Up
Volatility trading is the business of selling insurance against market panic. You collect a premium every month that nothing goes wrong. It pays steadily for years. Then one week wipes out the gains and, in several documented cases, the fund itself.
On 5 February 2018 the XIV exchange-traded note lost more than 90% of its value in a single session. LJM Partners lost close to $1 billion of client money over the same two days and shut down. In July 2025 the CFTC settled with LJM over what it had told investors a bad week would cost them.
That changes what you check first. The premium is real and well documented. The open question is whether the loss figure in the sales material matches the loss figure in the manager’s own risk model.
Those are two different numbers. Most investors only ever see one.
- How does volatility trading make money?
- Is volatility trading profitable?
- What is the difference between long and short volatility?
- Why do short volatility funds blow up?
- Why did the VIX hit 66 in August 2024?
- Why do volatility ETFs lose money over time?
- Do you already own short volatility without knowing it?
- Can you get your money out in a crash?
- What should you ask before investing?
How does volatility trading make money?
Volatility trading bets on how much a price will move, not on which direction it moves. The common version sells options while the movement priced into them is higher than the movement that follows. In equity markets that gap has run at one to four percentage points a year.
Two terms carry the argument. Implied volatility is the movement priced into an option today. Realised volatility is the movement that shows up afterwards. When the first is higher than the second, whoever sold the option keeps the difference.
The products differ more than the shared name suggests. Selling options directly, variance swaps, VIX futures, exchange-traded volatility notes, and dispersion trades that sell index options while buying options on the shares inside the index all sit in the same family of systematic strategies. Each breaks differently.
The pay for taking that risk has been shrinking. A Chicago Fed working paper published in September 2025 measured what sellers of index options earned above what they would have made by simply owning shares. Large and dependable from 1987 to 2005. Zero, in statistical terms, since 2010.
Sellers still quote the premium at its old size. The crash they are being paid to absorb has not got any smaller.
Is volatility trading profitable?
Yes, in most months and for years at a stretch, which is the part that misleads. The seller collects whenever the market stays calm, so a short book posts a high win rate and a flattering Sharpe ratio while carrying a loss it has not met yet.
Put 5 February 2018 against that record. The S&P 500 fell about 4% that day. The XIV note fell more than 90%.
A gain of one to four points a year that disappears in one session does not show up in an average. A Sharpe ratio counts that day as a single number in a long list of ordinary ones, which is how a fund about to lose everything still looks calm on paper.
What is the difference between long and short volatility?
Volatility trading has two halves and they are opposite trades. Short volatility is the seller: you take a payment now and promise to cover somebody else’s losses when the market crashes. Long volatility is the buyer, paying that same premium so somebody else covers yours.
| What happens | Short volatility (the seller) | Long volatility (the buyer) |
|---|---|---|
| A normal month | Small gain | Small loss |
| A crash | Very large loss | Very large gain |
| What you are doing | Writing insurance | Buying insurance |
| How it gets sold to you | Income, yield, premium | Protection, hedge, tail risk |
| What goes wrong | The crash arrives | Years pass with no crash and you stop paying for cover |
Both get sold as a volatility fund, and the sales words give away which one you are looking at. Income, yield and premium mean the fund is selling. Protection, hedge and tail risk mean it is buying. Settle that before anything else, because the two lose money on opposite days.
Getting it wrong costs real money, and it is the most expensive confusion in volatility trading. Hold a crash-protection fund next to a covered-call income fund and you own both sides of the same bet, pay two sets of fees, and finish roughly flat. Nobody buys that combination deliberately. It happens because both products are marketed as volatility funds.
The protection half also behaves like trend following: quiet or slightly negative for years, then one year that pays for all of them.
A third group sits in the middle and claims to be hedged. A dispersion trade sells insurance on the index and buys insurance on the individual shares inside it, betting the shares move around more than the index does.
On a calm day the two sides cancel out. In a crash everything falls together, the sides stop cancelling, and the loss lands on the leg that was meant to be the safe one.
Why do short volatility funds blow up?
Because in short volatility trading the losses are much bigger than the gains and arrive much faster. Income builds in small monthly amounts over years. The loss lands in one or two sessions. In February 2018 LJM lost more than 80% of its funds’ value in two days.
An honest performance chart shows that shape. A line that climbs smoothly with no sharp drops is either a short track record or an edited one.
- Billions sat in short volatility products across notes, managed accounts and hedge funds, all positioned the same way, with no real hedge between them
- On 5 February 2018 the VIX more than doubled in one session to close at 37.32, and the hedging those products were forced to do pushed the same futures higher still
- The XIV note lost more than 90% of its value that day and was closed early; holders were paid out at the crashed price, so the product failed alongside the strategy
- LJM lost close to $1 billion of client money and shut down; the SEC alleged losses above 80% of fund value over two trading days
The settlements added the part an investor could have asked about beforehand. LJM’s published worst case put the loss at 40%. Internal emails quoted by the CFTC said something different: “In extreme cases, theoretically we model to 100% loss.”
The firm also never told investors its risk had roughly doubled over two years. Our reading: the strategy did what short volatility does in a spike. The disclosure is what failed, and a disclosure can be checked before the event.
Why did the VIX hit 66 in August 2024?
On 5 August 2024 the VIX rose roughly 180% to nearly 66 before US markets opened, the largest one-day jump in its history. The Bank for International Settlements found most of that move came from dealers widening their quoted option prices rather than from trading.
The VIX is calculated from quoted prices rather than completed trades. When dealers widen quotes in a panic, the index jumps even if very little changes hands.
That matters when you read a manager’s crisis numbers. The 66 reading was real as a published level. Whether anyone could have bought or sold in size near it is a separate question, and the answer decides what a hedge was worth that morning.
The same work rules out the two explanations offered after most events like this. Volatility ETFs and dispersion trades were unlikely to have been the main cause. A manager who blames August 2024 on ETF flows has picked the easy answer.
Eight months later it happened again. On 8 April 2025 tariff news took the VIX to a close of 52.33 on Cboe’s data, its highest close outside 2008 and 2020. Any fund selling volatility has now lived through both days and can tell you exactly what each one cost it. Ask about the dates below one at a time.
Selling volatility is a real business, and so is selling fire insurance. The question is whether the manager has worked out what the fire costs, and whether you have been shown that number.
Why do volatility ETFs lose money over time?
Because holding VIX futures costs money in a calm market. Those futures usually trade above the spot index, so a fund tracking them sells a cheaper contract as it expires and buys a dearer one further out, month after month. That roll cost is the price of holding protection, and it runs whether or not a crash arrives.
Products that bet the other way, the short volatility funds, collect that same cost as income. It is why they climbed for years before February 2018. Then ProShares cut SVXY’s daily target from -1x to -0.5x at the close on 27 February 2018, three weeks after the spike.
The firm running the product halved its own bet. That is what it thought of the original size, and holders had no say in either decision.
Do you already own short volatility without knowing it?
Probably, if you hold covered-call or option-income funds. They sell options for income, which is short volatility under a friendlier name. Money in them grew six times over between 2019 and early 2024, from $20 billion to more than $120 billion. Volatility trading sits in plenty of portfolios whose owners never bought a volatility fund.
It matters before you buy one on purpose. A short volatility fund bought on top of income funds you already hold is the same bet twice, and both halves lose in the same week.
Cboe’s own analysis argues these funds were not what held volatility down in 2023: the gap between priced and realised movement widened from 1.5% to 3.6% that year, the opposite of what heavy selling produces. Treat it as a question about your portfolio rather than the market.
- Whether it is buying or selling volatility right now, as a number, rather than the range its mandate allows
- What the fund was worth on 5 February 2018, 16 March 2020, 5 August 2024 or 8 April 2025, for whichever of those days it was trading, and a plain “we did not exist yet” for the rest
- The worst case in its internal risk model, next to the loss figure in the sales material, and why the two differ
- The fund terms: what triggers an early close, who decides, and what a holder gets when it happens mid-crash
Can you get your money out of a volatility fund in a crash?
Sometimes you cannot, and the answer sits in the terms rather than in the strategy. XIV holders never decided to sell. The note let Credit Suisse call it once the intraday value fell to a fifth of the previous close, which is what happened on 5 February 2018, and the acceleration notice went out the next morning.
A fund reaches the same place through a different door. Suspended redemptions, a notice period longer than the crisis, or a manager winding the book down while the queue forms. Ask who holds that right, what triggers it, and what a holder receives when it gets used mid-crash. Every one of those answers is a clause in a document, which means it can be read before the money goes in.
What should you ask before investing in a volatility fund?
Five things, each with a document behind it. A manager running a real volatility trading book can produce all five inside a day. One who cannot has answered a different question.
| Topic | What the fund manager or developer tells you | What to ask for instead |
|---|---|---|
| Worst case | “Losses are capped at X%” | The worst case in their internal risk model, and when the two numbers last differed |
| Crisis record | A track record starting after the last crash | What the fund was worth on 5 February 2018, 16 March 2020, 5 August 2024 or 8 April 2025, for whichever of those days it was running |
| Direction | “We run a volatility strategy” | Whether it is buying or selling volatility today, as a number |
| Valuation | Month-end value only | The value during the worst day, and how much could have been sold at that price |
| Fund terms | The strategy only | Early-closure triggers, withdrawal limits, and who makes the call |
The fourth gets skipped most. August 2024 is why it matters: a valuation struck against a quoted price nobody could trade at is a number you cannot rely on.
What a fund does during a spike is one of the things we score, under the protection controls in our checklist, and it comes second on that list. A spike is the one test a risk system never gets to rehearse. The position-sizing and stress questions that follow apply to every strategy we look at, and they bite hardest here.
Most volatility funds cannot produce the loss figure in their own risk model
The standard above is not a high bar. It asks for a direction, a dated valuation on each of four crisis days, an internal worst case, and the fund terms. The number of managers who produce all of that without a second request is small, and that gap is why this site is selective rather than complete.
The strategies we cover have to answer all four before anything gets published. One of them, a systematic gold strategy in The Algo & Quant Review, was running through gold’s sharpest one-day fall since 1983 at the end of January 2026 and finished that session in profit, on the figures its developer reports.
Its loss limits are written down and enforced by the software: size cut at a 0.5% daily loss, no new trades at 0.75%, everything closed at 1%. A buyer can read those in advance and then check they were obeyed. Volatility trading is where that same question comes back with two different answers.