Implied Volatility (IV)

Implied volatility (IV) is the volatility value embedded in an options price — representing the market's collective expectation of how much a stock will move over the remaining life of the option. Unlike historical volatility (which measures how much a stock has moved in the past), implied volatility is forward-looking: it reflects what options buyers and sellers are currently willing to pay for exposure to future movement.

IV is not a direction prediction — it represents expected magnitude regardless of direction. A stock with very high IV is expected to move significantly, either up or down. A stock with low IV is expected to trade in a narrow range. This is why IV spikes ahead of binary events like FDA decisions, earnings releases, and M&A announcements: the market is pricing in that a large move in either direction is likely.

IV Percentile and IV Rank

Because absolute IV levels differ dramatically across stocks (a biotech in a PDUFA window might have 200% IV; a large-cap utility might have 20% IV), traders use IV percentile (IVP) or IV rank to contextualize current IV relative to the stock's own history. An IV percentile of 90 means that current IV is higher than 90% of historical readings for that stock — indicating that options are unusually expensive, often because the market is pricing in an expected catalyst event.

IV Crush

After a binary event occurs — earnings are released, an FDA decision is announced — the uncertainty that drove IV higher is resolved. Options prices typically decline sharply as the uncertainty premium is removed from the price, a phenomenon called "IV crush." Traders who bought options before a catalyst can experience significant options price declines even if the underlying stock moves in their favor, simply because IV has been removed from the options price post-event. This is one of the most important risks in catalyst options trading.

IV in Options Flow Analysis

TradeAI News monitors IV levels as part of its options flow analysis. A sudden IV spike on a ticker without an obvious known catalyst can itself be a signal — suggesting that informed participants are bidding up options prices in anticipation of an event not yet public. This type of IV anomaly, when combined with unusual options volume, is one of the higher-quality pre-catalyst signals in the platform's detection library.