Nvidia's directors bagged $80 million last week in a selling spree following the company's blowout results

• Some Nvidia shareholders are cashing in on the company's sustained stock surge.
• Nvidia directors sold 99,000 shares worth about $80 million last week.
• Nvidia's insider stock sale last week was the most in a month since September

Some of Nvidia's shareholders are cashing in following the chipmaker's sustained stock surge.