VST ATM implied volatility is 37%, which is moderate in absolute terms. The options market is pricing a 1-sigma move of ±1.9% (±$2.69) into the nearest expiry. Bear in mind absolute IV isn't comparable between tickers — 40% is cheap on a high-beta name and expensive on a utility.
Implied volatility is the options market's estimate of how much VST will move, annualised. On its own the number is close to meaningless — that is why "VST IV is 37%" answers nothing until you know whether 37% is normal for VST. IV rank fixes that by ranking today's IV inside its own 52-week range. We don't have a rank for VST this moment, so treat the absolute figure with care.
Practically: VST premium is priced around its own average, so IV is neither the edge nor the obstacle here. Structure the trade around your directional read and the levels rather than around volatility.
The chain is pricing a 1-sigma move of ±1.9% (±$2.69) into the nearest expiry — meaning roughly a two-in-three chance VST finishes inside that band. That is the number to compare your target against: if your thesis needs less than the expected move, the options are already paying for it, and if it needs substantially more, you are buying a low-probability outcome regardless of how cheap the contract looks.
One thing most IV screens miss: dealer positioning. VST is currently in negative dealer gamma, which means hedging flow is amplifying realised movement, so realised vol can outrun what implied is charging. That combination is the one where long premium tends to work. See VST's full gamma map →
VST's ATM implied volatility is 37%, which is moderate in absolute terms. Without an IV rank the honest answer is that absolute IV can't be judged in isolation.
There is no universal number, and that is the whole problem with the question. 40% IV is cheap on a high-beta name and expensive on a consumer staple. The comparison that works is IV rank: 0 means today's IV is the lowest of the past year, 100 the highest. Above 60 is generally treated as rich, below 30 as cheap.
Implied volatility is the annualised move the option's price implies, backed out of the market price rather than calculated from history. It is a price, not a forecast: high IV means options are expensive, low IV means they are cheap. It says nothing about direction.
It is solved for, not computed directly. You take the option's actual market price and reverse-engineer the volatility input that a pricing model (Black-Scholes for European options, a binomial model for American ones) would need in order to output that price. There's no closed-form solution, so it's found numerically by iteration. ATM IV — the figure above — uses the at-the-money contract in the nearest expiry, which is the most liquid and the least distorted by skew.
No — it means the market is charging as if it will. High IV frequently precedes a large move, but it also frequently reflects an event premium that collapses the moment the event passes, which is why buying options into earnings can lose money on a correct directional call. Compare implied against realised movement rather than trusting either alone.
IV is the raw number (37% for VST). IV rank puts it in context by asking where that number sits inside the same ticker's own 52-week range. IV alone can't be compared between tickers; IV rank can.
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Also see the structure side: VST gamma map → · VST implied vs actual earnings move →
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ATM IV and expected move estimated from the live options chain (Polygon); IV rank from Unusual Whales. Implied volatility moves intraday · educational, not financial advice · options carry substantial risk of loss.
