Gamma Scalping Explained: How Delta-Hedged Straddles Trade Volatility

Gamma scalping is an options strategy that involves delta-hedging a long-gamma position, typically an at-the-money straddle, to mechanically profit from large moves in the underlying asset while paying daily theta. The strategy is essentially a bet that realised volatility will exceed implied volatility over the holding period, with re-hedging serving as the profit collection mechanism. A simple formula estimates the daily breakeven move as the underlying price multiplied by implied volatility divided by the square root of 252 trading days. As of early August 2026, SPY's implied volatility sat above its 20-day realised volatility, a condition known as the volatility risk premium, which statistically disadvantages long-gamma positions on average. Practical considerations such as transaction costs, hedging frequency, and overnight gaps significantly affect real-world outcomes, making cost management and volatility estimator selection critical to the strategy's edge.