In the mid-1990s, a $10,000 investment in a nascent online bookstore seemed risky, but for Jeff Bezos’s siblings Mark and Christina, the decision may have catapulted them into the ranks of billionaires. A Bloomberg report reveals that in 1996, they each purchased 30,000 Amazon.com Inc. shares for $10,000. This investment has since grown exponentially, with each sibling’s stake potentially reaching over $1 billion today, a 10,249,900% gain.

According to an article by Luxury Launches, referencing a Bloomberg report from July 31, 2018, the stakes held by Jeff Bezos’s siblings were valued at $640 million each, based on Amazon’s stock closing price of $91 at the time. Fast forward to the present, and with Amazon’s stock price at $149, their stakes are now valued at $1.044 billion each.