Forbes estimates Sergey Brin’s net worth at $265.0B (real-time, 10 Oct 2026, #5 in the world). Most of it is his Alphabet shares: Alphabet’s latest filing lists 37,469 Class A and 358,939,978 Class B shares, 42.9% of the Class B stock and 25.3% of Alphabet’s total voting power. It is an outside estimate that moves with the share price, not a disclosed figure.
Correction (10 Oct 2026): this page previously showed undated or unsourced net-worth figures. We replaced them with one dated, named estimate and the holdings disclosed in filings, and we now tag every input as filing, reported or estimate.
How we source: figures on this page come from the company’s own filings (SEC 10-K, 10-Q, prospectus and earnings releases, or its annual report), with the period stated next to each number; outside estimates appear only labelled, with their source and date. Last refreshed October 2026. Our methodology.
The most widely cited figure is Forbes’s: $265.0B on 10 Oct 2026, #5 in the world. It is an outside estimate, not a figure Brin or any company has disclosed.
Other outlets publish different figures, and each changes with share prices. Use one source consistently, and always note its date.
How the fortune was built
Sergey Brin’s fortune comes from Alphabet. The timeline below tags each step: SEC filing when it comes from a filing, Reported when it comes from Forbes’s profile.
Sergey Brin: the fortune and its milestones Estimate
Before the chart: 1979 Moves to the US ยท 1998 Co-founds Google ยท 2004 IPO, then Alphabet
12019 ยท Steps down as president Reported
22026 ยท Control in the proxy SEC filing
Forbes annual list estimates and the real-time estimate (gold); Forbes. Milestones as tagged in the timeline below.
With Larry Page, after they met at Stanford (Forbes).
2004 / 2015Reported
IPO, then Alphabet
Google listed in 2004 and became Alphabet in 2015 (Forbes).
2019Reported
Steps down as president
Remains a director and a controlling shareholder (Forbes).
Apr 2026SEC filing
Control in the proxy
358.9 million Class B shares (42.9% of the class), 25.3% of total voting power.
What drives the number
Every estimate of Brin’s wealth is the same model: his Alphabet shares, times Alphabet’s share price, plus other investments. The share count is public, so most of the movement comes from the share price.
Using one consistent source, Forbes’s annual World’s Billionaires lists, the estimate moved from $39.8B (Mar 2017) to $237.0B (Mar 2026). Because most of it is Alphabet stock, the line largely tracks the share price.
Estimated net worth over time Estimate
Mar 2017
$39.8B
Mar 2018
$47.5B
Mar 2019
$49.8B
Apr 2020
$49.1B
Apr 2021
$89.0B
Apr 2022
$107.0B
Apr 2023
$76.0B
Apr 2024
$110.0B
Apr 2025
$138.0B
Mar 2026
$237.0B
10 Oct 2026
$265.0B
Annual World’s Billionaires list estimates (Forbes); gold bar = real-time estimate on 10 Oct 2026. All figures are estimates by the same outlet, so they are comparable with each other, not with other outlets’ numbers.
Both lines indexed to 100 at the Mar 2017 list. Net worth: Forbes list estimates and real-time estimate. Share price: month-end close in each list’s month, split-adjusted (Yahoo Finance); latest point: close on 9 Oct 2026. Index levels, not dollars; the gap shows what else moved the estimate (share sales, gifts, other assets).
โThe value of private holdings, cash or property.
โShares sold or given away outside the filing dates.
What he does now
Forbes says Brin has given more than $2 billion to Parkinson’s research and focuses his giving on conditions of the central nervous system and climate change.
The Business Engineer view
What Brin’s fortune really measures
The share count is filed; the estimate tracks Alphabet’s share price. For founders with filed stakes, the share count is public and only the price moves; the estimate is then close to a measurement.
Read any net-worth figure with three questions: who estimated it, on what date, and at what share price. For the company behind the fortune, see Alphabet on FourWeekMBA.
Frequently asked questions
What is Sergey Brin's net worth?
Forbes estimates Sergey Brin’s net worth at $265.0B (real-time, 10 Oct 2026, #5 in the world).
How did Sergey Brin make his money?
Mainly through Alphabet. Moves to the US: His family left Russia when he was 6 (Forbes). Co-founds Google: With Larry Page, after they met at Stanford (Forbes).
How much of Alphabet does Brin own?
Alphabet’s latest filing lists 37,469 Class A and 358,939,978 Class B shares, 42.9% of the Class B stock and 25.3% of Alphabet’s total voting power (Alphabet 2026 proxy statement (filed 24 Apr 2026)).
Why do Sergey Brin net worth figures differ?
Each outlet multiplies an estimated share count by the share price on a given day and adds its own estimate of other assets, so figures differ by source and by date.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
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