# Sergey Brin

Type: Person

Source: Legal & RegTech Intelligence Brief — https://getlegalbrief.com/entity/sergey-brin
Canonical HTML page: https://getlegalbrief.com/entity/sergey-brin

## Timeline

- **2026-11-03**: Election Day — California voters will decide on the billionaire tax alongside two other tax measures.
- **2026-11**: Proposition 40 Goes to Voters — California voters will decide on Prop 40, the one-time billionaire wealth tax, along with competing initiatives funded by Brin that could block or delay its implementation.
- **2026-11**: California ballot showdown — Voters decide Proposition 40 wealth tax and countermeasures Proposition 41 and Proposition 42.
- **2026-08-10**: Brin Contributes Final $20 Million — Sergey Brin donates an additional $20 million to Build a Better California, raising his total spending against Prop 40 to $102 million, per a campaign finance filing.
- **2026-08**: Brin's 2026 contributions reach $102 million — California Secretary of State data show $102 million in 2026 contributions to Building a Better California, including a $20 million latest donation.
- **2026-06-26**: Ballot Qualification Announced — The measure officially qualifies for the November 2026 ballot.
- **2026-06**: Competing Audit Measure Qualifies — The California Secretary of State announced that a ballot measure requiring audits of programs funded by new state special taxes had qualified for the November ballot, setting the stage for a potential conflict with Proposition 40.
- **2026-01-01**: Valuation Date — Billionaires' net worth assessed on this date for the one-time 5% tax.

## Recent coverage (3 stories)

### Brin Spends $102M to Block California Wealth Tax via Two Ballot Measures
2026-08-13 04:06:05 · Sentiment: Neutral · Impact: 5/10 · Sources: 2

Sergey Brin has put $102 million behind Proposition 41 and 42, companion ballot measures that could nullify California's proposed wealth tax, Proposition 40. The November 2026 vote sets up a significant direct-democracy and constitutional test over how states may tax billionaire net worth.
Full story: https://getlegalbrief.com/story/brin-102m-california-wealth-tax-legal-battle

### Brin's $102M Anti-Tax Blitz: Prop 40's Legal Perils and Countermeasures
2026-08-11 09:28:15 · Sentiment: Neutral · Impact: 6/10 · Sources: 2

Google co-founder Sergey Brin's $102 million campaign against California's billionaire wealth tax is a masterclass in legal and procedural countermeasures. Facing a $13.3 billion liability, Brin funded competing ballot initiatives that create constitutional and administrative hurdles, raising questions about direct taxes, state property tax caps, and the enforceability of a net worth levy.
Full story: https://getlegalbrief.com/story/brin-102m-prop40-legal-fight

### California's $100 Billion Billionaire Tax Faces Constitutional Firestorm
2026-07-12 04:21:49 · Sentiment: Neutral · Impact: 6/10 · Sources: 3

A November ballot measure imposing a one-time 5% net-worth tax on California billionaires sets up a high-stakes legal battle over state and federal constitutional limits. Domicile definitions, uniformity clauses, and dormant Commerce Clause challenges could stall implementation even if voters approve. Legal experts are already dissecting the proposal’s vulnerabilities, with opponents preparing litigation strategies.
Full story: https://getlegalbrief.com/story/california-billionaire-tax-legal-challenges

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