Introduction to Gamma Scalping for Short-Dated Weekly Options

Gamma scalping is an advanced options trading strategy that seeks to profit from the changes in an option's delta as the underlying asset's price fluctuates. This strategy is particularly well-suited for short-dated weekly options, which have high gamma and are therefore more sensitive to changes in the underlying price. This article will provide an introduction to gamma scalping, explaining the key concepts and demonstrating how it can be applied to weekly options.

What is Gamma?

Gamma is one of the option Greeks, and it measures the rate of change of an option's delta. In other words, gamma tells you how much an option's delta will change for every $1 move in the underlying asset's price. Options with high gamma are more responsive to price changes, which makes them ideal for gamma scalping.

Why Weekly Options?

Weekly options have a very short time to expiration, which means they have a high gamma. This is because as an option approaches expiration, its delta becomes more sensitive to changes in the underlying price. This high gamma makes weekly options the perfect instrument for gamma scalping.

The Basics of Gamma Scalping

The goal of gamma scalping is to maintain a delta-neutral position while profiting from the changes in the option's delta. This is achieved by buying or selling the underlying asset to offset the changes in the option's delta. For example, if you are long a call option and the underlying price goes up, your delta will increase. To maintain a delta-neutral position, you would sell some of the underlying asset.

A Simple Gamma Scalping Example

Let's say you buy a one-week at-the-money call option on stock XYZ with a delta of 0.50 and a gamma of 0.10. To create a delta-neutral position, you would sell 50 shares of XYZ stock. Now, let's say the price of XYZ goes up by $1. Your call option's delta will increase to 0.60 (0.50 + 0.10). To re-establish a delta-neutral position, you would sell another 10 shares of XYZ stock. By continuously adjusting your position in this way, you can profit from the small fluctuations in the stock's price.

Gamma Scalping P&L

The profit and loss (P&L) of a gamma scalping strategy can be calculated using the following formula:

P&L = (Gamma * (Underlying Price Change)^2 / 2) - Theta Decay

P&L = (Gamma * (Underlying Price Change)^2 / 2) - Theta Decay

This formula shows that the profitability of gamma scalping is dependent on the magnitude of the underlying price changes and the rate of time decay.