The purpose of that trading plan is precisely to allow you to have arrangements to sell shares as an insider. So if he was pre-arranging legally, this is how he

The purpose of that trading plan is precisely to allow you to have arrangements to sell shares as an insider. So if he was pre-arranging legally, this is how he'd do it. You don't have to be an expert. Practically everyone who isn't rank-and-file gets the dossiers on this nonsense in a public company.