According to the instructions for the SEC form 4 (which...

According to the instructions for the SEC form 4 (which disclosed David Rosa's sale of 2506 shares), the reason for the sale is :

"Payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3"

So he's selling a few shares for tax purposes, and continues to hold MANY more shares or options.

I'm ok with that.