It's been a few years since I've done stuff like that but, as I recall, there are lots of rules when an officer of a company is allowed to sell stock. Most of them prevent the officer from timing his sale. That's to avoid pump and dump situations - not to create them.
Those trades are placed through a broker, not an on-line account. Since it is a 'block trade' the broker tries to execute the order without affecting the market any more than necessary. It can take several days, depending on the size of the block and market conditions. (Works the same way for 'block trade' purchases.) The officer may not have any idea how much he has sold or when. Usually doesn't. When the order is satisfied, i.e., all of the block of stock is sold (or bought), the confirmation slip is issued. Since this is not an on-line account, it arrives by snail mail, as much as a week later.
That's why it's delayed and why it may cover several days. You file when you get the information. The system was designed before high speed trading and also before high speed reporting.
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