he is talking about canceling a pending sale of stock. When you are an executive or board member of a company you are not allowed to just buy and sell large amo

he is talking about canceling a pending sale of stock. When you are an executive or board member of a company you are not allowed to just buy and sell large amount of stock on a whim you must setup buying and selling plans to spread the trades out over weeks or months. So in this case you had a sell order planned over the next few months but now you know the shares will increase in value after the date of the scheduled sale so you cancel the sell plan. This is considered legal because you did not use your insider information to actually trade stock only to refuse to trade stock