Today is the monthly option expiration day for Sept options. Intel is a target for option trading related to dividend arbitraging. It is a regular Intel trading pattern to trade near the option strike prices because that is where the option premium is the highest.
The "whatstrading" site indicates that a Sep 28th $23 6,000 contract straddle occurred earlier but I only see the put option volume so far.
I think that it is large value and pension funds looking to enhance their income by playing the Intel dividend which should be announce in the next couple days and ex dividend early in Oct. Oct 3rd if history holds.
It happens regularly. Last year, this dividend attracted almost 2mil option contracts volume for the ex-div date.