Why Listed Options Are Only an Approximate Volatility Swap Proxy
Summary
The document cautions that volatility indexes and their futures are not the same instruments as variance swaps or volatility swaps. Anyone trying to express a related view must first decide whether the target exposure is to spot or forward-starting volatility or variance, then select instruments that match it. A short variance and long volatility position is characterized as akin to being short volatility of volatility, so the intended risk exposure should be understood before constructing a trade.
One response describes approximating realized variance with a broad strip of out-of-the-money options, using delta hedging to create synthetic variance exposure. Listed vanilla options can also support log-contract replication, while calendar spreads or backspreads may provide partial implied-volatility exposure. These approaches are imperfect: volatility-of-volatility, jumps, and discrete hedging can create differences from the desired payoff. The discussion gives no tested retail implementation or performance evidence, and explicitly questions whether a volatility swap is practical for retail traders.
Key ideas
- VIX and V2X futures provide exposures distinct from variance swaps and volatility swaps.
- Trade design depends on whether the target is spot or forward-starting volatility or variance.
- A broad, delta-hedged strip of out-of-the-money options can approximate realized-variance exposure.
- Calendar spreads and backspreads can provide partial implied-volatility exposure but do not replicate a pure volatility swap.
- Volatility-of-volatility, jumps, and discrete hedging can cause proxy trades to diverge from the intended exposure.
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Full text
# A proxy to trade volswap # A proxy to trade volswap On a recent note, SG team gave à trade idea : short varswap vs long volswap on stoxx50 I would like to translate such trade on a retail language. Short varswap is easy for a retail , it is short v2x But how to trade long volswap ? Beeing long straddle ? How to trade atm volatility , the strike of a vol swap is very near atm vol… ## Answer by Frido (score 4, accepted) https://quant.stackexchange.com/a/83623 Both the VIX and V2X cannot be traded, they are not tradables. What can be traded are the futures, but they're not varswaps either. So you have to decide first if you want to trade spot or forward starting volatility/variance, and the next step is then finding the instruments. The SG idea of short varswap long volswap is akin to you being short vol of vol. So maybe SG is keen to buy vol of vol and you might ask yourself why that is the case before designing and entering the trade. Furthermore a volswap is still quite challenging to trade - not sure it's suitable for retail to be honest. How to trade volswap is a separate question altogether I think. And for the avoidance of doubt, short v2x future long ATM on SX5E is not a vol of vol trade / short varswap long volswap trade. ## Answer by Arnoldik (score 1) https://quant.stackexchange.com/a/83657 If you're looking to replicate or proxy a volswap using listed instruments, the most common route is using a strip of options — essentially constructing a synthetic variance swap. The classic approach involves delta-hedging a portfolio of out-of-the-money options across a wide strike range to approximate exposure to realized variance. But if you're looking for something more practical and tradeable, some desks approximate this with a log contract replication using listed vanilla options, or they monitor VIX futures dynamics. Of course, this isn’t perfect — vol of vol, jump risk, and discrete hedging errors can bite — but it's often close enough for macro or directional plays. If you’re trading retail or without access to full strips, even a calendar spread or backspread on implied vol can get you partial exposure — not pure vol, but a decent proxy depending on what you’re aiming to express.
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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.