What is Highest Gamma Expiration Date? Highest Gamma Expiration Date is the date for which the largest amount of gamma expires in the underlying stock. Why does Highest Gamma Expiration Date matter? Options market maker activity may build as this date approaches. How to use Highest Gamma Expiration Date The stock may pin to large gamma strikes as the date approaches the large expiration date. Interested in learning more? Related articles What is Highest Delta Expiration Date? What is Gamma in Next Expiration? What is SPX Reference? What is Delta in Next Expiration? What is Implied Skew?