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Big Techphilanthropy

Sergey Brin gifts $1.1 billion in Alphabet stock after AI rally

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Biz Carson
Biz Carson
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Bloomberg
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Biz Carson
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November 30, 2025, 5:19 PM ET
Sergey Brin attends the 11th Breakthrough Prize Ceremony at Barker Hangar on April 5, 2025 in Santa Monica, California.
Sergey Brin attends the 11th Breakthrough Prize Ceremony at Barker Hangar on April 5, 2025 in Santa Monica, California.Axelle/Bauer-Griffin—FilmMagic via Getty Images

Sergey Brin gave away more than $1.1 billion worth of Alphabet Inc. stock this week, with most of the money going to a nonprofit the Google co-founder created.

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The donation was disclosed Friday in a regulatory filing, which didn’t specify who had received the more than 3.5 million shares. According to a spokesperson for Brin’s family office, roughly $1 billion in stock is going to Catalyst4, which the billionaire started in 2021 with the dual purpose of supporting research into central nervous system diseases and climate-change solutions.

Brin is also giving about $90 million to his family foundation, the spokesperson said, as well as $45 million to the Michael J. Fox Foundation, which supports research into Parkinson’s disease. In May, Brin had previously doled out Alphabet shares worth $700 million to the same three charities.

Brin, 52, is the world’s fourth richest person, with a $255.5 billion fortune, according to the Bloomberg Billionaires Index. His net worth has soared this year thanks to a rally in Alphabet shares, which hit a high of $323 on Tuesday boosted by company’s artificial intelligence gains. Brin owns a roughly 6% aggregate stake of the business and has seen his fortune gain $97.3 billion this year so far.

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