agree with MikeTee and one more point to add. From a basic investment principles perspective, employees should always sell a lot of their company stock. They are fully invested in the company with their time and their work - and they are getting lots of income from it. They usually have invested or locked up shares also. So they should be selling in order to diversify, buy a house, or whatever.
Insiders Sell Stock. Their Companies Buy. It's Not a Good Sign