Basic idea

A straddle combines one call option and one put option, normally with the same strike and expiry. A straddle premium chart shows the combined value of the selected option premiums over time.

Why the combined premium moves

The total can expand when the underlying makes a strong move, implied volatility rises, or uncertainty increases. It can contract as time passes, volatility falls, or the market remains inside a limited range. These are general market relationships, not guaranteed trading outcomes.

Fixed versus rolling charts

A fixed chart keeps the user's chosen contracts throughout the displayed period. A rolling chart adapts its contract selection over time according to the selected mode. The two charts can therefore have different shapes even when they refer to the same market and expiry.

Reading the candles

Each candle summarizes how the displayed premium moved during its interval through open, high, low, and close values. The amount of wick detail can depend on provider activity and the historical resolution available for the selected contracts.

Useful chart tools

Session VWAP compares premium with its session-weighted average. EMA 21 and EMA 25 show smoothed premium direction. The recent-low indicator shows the percentage distance from the lowest wick in a chosen candle lookback. Custom Range measures the signed percentage change between any two selected chart points.

Important limitation

A straddle chart is an analytical view, not a recommendation. Provider feeds, reference prices, candle boundaries, inactive contracts, and platform-specific rolling rules can produce differences between charts. Always verify prices and risk with your broker before trading.