While attending Oneida Elementary school in Kentucky, Jensen Huang, president and CEO of AI megamonster Nvidia (NVDA) , made a deal with his roommate. Related: Nvidia CEO Jensen Huang just told investors what’s next for the AI chipmaker Huang would teach the illiterate student how to read in exchange for being taught how to bench press.

Nearly every day for the past few months, Huang has sold Nvidia stock. For example, on Sept. 12 and 13, he sold about 200,000 shares, worth more than $20 million.

Nvidia stock closed 4% higher on a report that CEO Jensen Huang is done selling shares. Huang raked in $713 million in total proceeds from the sales. He remains Nvidia's biggest shareholder. Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview