Jeff Bezos‘s fortune struck an all-time in after-hours trading after Amazon.com Inc . reported the strongest holiday quarter sales growing in eight years.

The net worth of the world’s richest boy had already risen $17.4 billion in the first month of the year, and he will see his wealth reach a record $123 billion on the Bloomberg Billionaires Index if the gain comprises Friday. Bezos had $116.4 billion on the indicator following the conclusion of trading Thursday and the projected gain will more than wipe out his $4.9 billion loss that day.

The milestone comes after two days of wild swingings for tech tycoons as their companies reported earnings. Mark Zuckerberg‘s luck rose $2.5 billion on Thursday as Facebook Inc . reported strong fourth-quarter earnings. His fortune plummeted in after-market trading Wednesday, ultimately trading up as much as 4.2 percentage the following day.

Alphabet Inc.’s Larry Page and Sergey Brin lost as much as$ 3 billion apiece in after-hours trading Thursday as fourth-quarter earnings missed analysts’ estimations, hobbled by rising payments to web-search spouses, higher marketing expenditures and difficulties at YouTube. The inventory recouped much of the initial loss by 5 p. m. in New York.

Pierre Omidyar ended the day down about $100 million as his stake in Paypal Holdings Inc. was cut by $400 million while the value of his EBay Inc. holdings rose $300 million. The seesawing came as EBay unveiled plans to change its payments business to Dutch company Adyen BV from Paypal.