Brin is a co-founder of Alphabet, the holding company that owns Google, the world's largest search-engine operator. The Mountain View, California-based company was set-up in 1998 and reported revenue of $402 billion in 2025. The group's divisions include Gmail, Android and video sharing service YouTube.
The majority of Brin's fortune is derived from a stake in Alphabet, the parent company of Google, the world's largest search engine, according to Net Market Share.
The billionaire owns both Class B and Class C shares, giving him an aggregate stake of about 6% of the business, according to an April 2026 filings. Brin's Class B shares don't trade and are valued using current market prices for the company's Class A shares. They're convertible into the publicly traded shares on a one-for-one basis, according to Google's proxy. He owns about 360 million Class C shares, which are also publicly traded, according to a February 2026 filing.
Since the company's 2004 initial offering, the billionaire has sold shares valued at more than $11 billion, according to data compiled by Bloomberg. The value of his cash investments is based on an analysis of these share sales, market performance, charitable giving and taxes.
A spokesperson for Brin's family office didn't respond to a request for comment.
The younger of Google's co-founders fled the Soviet Union with his family at the age of 6. His father was a mathematician. Brin studied math and computer science at the University of Maryland. He eventually pursued a doctorate at Stanford, where he met his future business partner, Larry Page. The pair created a search engine in a friend's garage in 1998, eventually forming Google and selling shares in a public offering in 2004.
In 2011, after 10 years as head of technology, Brin took on a new role as director of special projects, one of which is a robotics lab. He's a director of Alphabet, a holding company for Google and other businesses.