The process whereby the grantor of an option decides to buy or sell more or less of an underlying futures contract in order to protect against being declared upon by the options holder. If delta hedging, the grantor of a call option will buy more of the futures contract if it rises in value towards the strike price (as the probability of being declared upon rises towards 100%). The grantor of a put option will typically sell more of the underlying futures contract if it slides in value (as the probability of being declared upon rises towards 100%).