Gamma scalping is a sophisticated options strategy that exploits the relationship between an option's gamma and realized volatility. When you own a call or put option, you hold gamma—the rate at which your delta (directional exposure) changes as the stock price moves. Gamma scalping involves repeatedly buying and selling the underlying stock to maintain a delta-neutral position, capturing profits from price swings.
How It Works
The mechanics are straightforward but require active management. You purchase an option and sell shares of the underlying stock equal to the option's delta. As the stock price rises, your option becomes more valuable and your delta increases—so you sell additional shares to rehedge. When the stock price falls, your delta decreases—so you buy shares back to rehedge. Each rehedge locks in small profits from the price movement, and these profits accumulate over time if realized volatility exceeds the implied volatility you paid for the option.
The strategy works because options are priced using implied volatility assumptions. If actual price movements (realized volatility) are larger than implied, your frequent rehedges generate positive returns. If realized volatility is lower than implied, you lose money.
Why It Matters for Investors
Gamma scalping is primarily used by options traders and market makers, but sophisticated angel investors should understand it because it reveals how volatility creates opportunity. The strategy demonstrates why some investors pay premiums for options during calm markets—they expect gamma scalping profits from future volatility. Understanding gamma scalping also helps you evaluate risk in your portfolio. If you own call options or put options, you're implicitly exposed to gamma dynamics and rehedging costs.
Example
Imagine a stock trading at $100 with implied volatility of 20%. You buy a call option expiring in 30 days and sell 50 shares to stay delta-neutral. The stock jumps to $105. Your call option delta increases from 0.50 to 0.65, so you sell an additional 15 shares at $105. Later, the stock drops to $102, and your delta shrinks to 0.55, so you buy back 10 shares at $102. If the stock continues oscillating while implied volatility stays at 20%, your repeated buy-low, sell-high rehedges accumulate profits—assuming realized volatility exceeds 20%.
Key Takeaways
- Gamma scalping profits from the difference between implied volatility (option price) and realized volatility (actual stock movement)
- The strategy requires active, frequent rehedging and works best in volatile markets
- It's capital-intensive and involves transaction costs that can erode returns on small positions
- Understanding gamma helps investors grasp why options become more valuable during volatile periods and why market makers hedge constantly