Net worth in October 2018: $52.4 billion
2018 charitable giving: $25 million*
Giving as a percentage of net worth: 0.0%
Brin, 46, founded the search engine in a garage in California in 1998 with Larry Page, Business Insider previously reported.
Brin donated $2.2 billion between 2000 and 2017 primarily to fund Parkinson's research and underserved populations through his Brin Wojcicki Foundation and the Sergey Brin Family Foundation, according to the Chronicle of Philanthropy.
*Per Zucman's analysis, those billionaires who didn't appear on Forbes' 2018 "America's Top 50 Givers" ranking were assigned a donation amount of $25 million, which is the amount the lowest-ranked person on the givers list donated (and therefore represents the most an unlisted billionaire may have given in 2018). Brin's actual 2018 giving amount is unknown.