California Venture Capital Hits $366B Despite Billionaire Tax

The money stayed put

For most of a year, Silicon Valley has warned that California's proposed billionaire tax would drive founders and capital out of the state. So far, the funding data shows the opposite. California has drawn $366 billion in venture investment so far in 2026, about 90% of all U.S. venture capital, according to PitchBook data reported in August.31 That works out to roughly three times what every other state raised combined.39 New York ranked second with $27 billion in announced deals, about one-thirteenth of California's total.39

The timing matters. On November 3, Californians vote on Proposition 40, which would impose a one-time 5% tax on the net worth of residents worth more than $1 billion.9 Most of the money would go to state healthcare programs, with a smaller share for food assistance and public education.9 The fight over the measure has become one of the most expensive ballot campaigns in state history.3 The question for the startup economy is whether the threat of the tax has changed where venture money goes. The funding data, at least, says it has not yet.

How big the concentration is

The 90% figure is not the only number in circulation, and the different numbers measure different things. In an endorsement letter for Proposition 40, six Nobel laureate economists, including Paul Krugman, Joseph Stiglitz and Esther Duflo, said California has taken 80% of all new U.S. venture funding since the start of 2026, up from about 50% before 2025.2 An earlier PitchBook-based analysis looked at a trailing 12-month window ending in June. It found Bay Area companies took $411 billion, or 70% of all venture funding, while Southern California took another $21 billion, or 4%.32 In that same period, New York City drew $45 billion and Boston $20 billion.32

Crunchbase's third-quarter figures look less lopsided. Global venture funding reached $159 billion in Q3 2026. U.S. companies raised $91 billion of it, about 57%, and the San Francisco Bay Area accounted for 24% of global investment.21 Simple arithmetic puts the Bay Area at roughly $38 billion, or a little over 40% of U.S. dollars in the quarter. That is well below the year-to-date share.

The gap is real, and the likely reason is lumpy deals rather than an exodus. PitchBook's year-to-date total includes enormous rounds for the two largest frontier labs. Anthropic and OpenAI alone accounted for half of the $366 billion California raised this year.39 Q3 was spread more widely. A record 27 companies raised rounds of $1 billion or more, but no single company raised tens of billions.21 Several of the biggest Q3 checks went to companies outside California, including Moonshot AI, Mistral AI, Nscale and Kling AI, alongside Databricks and Safe Superintelligence, which each raised $5 billion.21 In a quarter without a mega-round for OpenAI or Anthropic, California's share returns to something closer to its historical norm, which was already dominant. That is a different thing from losing ground.

The Nobel economists' baseline of about 50% before 2025 matches older data. Crunchbase found California took 51% of U.S. funding in the first three quarters of 2023, up from 47% in 2019.34 Wherever 2026 ends up between 40% and 90%, the state is not losing share. The AI boom has made it more central.

Big rounds explain the totals

Under the headlines, the deal-level story is about size. AI startups raised $102 billion in Q3, or 64% of global venture capital.21 In California the concentration is even greater: 86 cents of every venture dollar raised in the state went to AI companies, according to the PitchBook-based reporting.31 Late-stage funding totaled $105 billion in Q3. Rounds of $100 million or more made up close to 90% of late-stage financings.21 Even at the early stage, which reached $40.6 billion, companies raising $100 million or more accounted for half of financings.21 Seed funding came to $13 billion, and $2.6 billion of that went to seed rounds of $100 million or more.26

The effect is that a few huge rounds set the headline numbers, and those rounds go mostly to the Bay Area. Total funding in the first three quarters of 2026 reached $679 billion, the most for any nine-month period on record.21 Q3 was down 25% from Q2's $212 billion but still up 53% from a year earlier.26 Founders raising a Series B or C outside the top tier of AI companies face a harder market. Investors are putting a third of a quarter's capital into 27 companies, which gives check-writers the upper hand in pricing for everyone else.27

Southern California also shows up in the top deals. Four of the 25 largest venture raises in 2026 went to companies in the region: Anduril Industries, Shield AI, Travis Kalanick's new venture Atoms, and El Segundo nuclear startup Valar Atomics.39 It is notable that Kalanick's company appears on that list, because Kalanick is one of the billionaires reported to have left California before the tax's residency cutoff.11 Founders can move. Companies, engineers and investors have been slower to follow.

The tax fight is aimed at startup equity

The tech industry's main objection to Proposition 40 is less about current fortunes than about founders who are billionaires on paper. In January, a slogan spread in tech circles: "Leave before the B." The advice was for founders to move out of California before a Series B round could give them an illiquid net worth in the billions.14 Investor Brianne Kimmel said most of her California portfolio companies had begun drafting plans to leave if the measure passes.14 Critics also focused on how the measure values founder stakes based on voting control. Palmer Luckey argued that this makes founder-led companies "practically illegal."14 The Tax Foundation estimated that the effective rate for many founders could run far above the advertised 5%.15

Some people have left. Seven of the state's estimated 214 billionaires reportedly moved before or around the January 1, 2026 cutoff, including Peter Thiel, Travis Kalanick, Larry Page and Sergey Brin.9 Leaving may not get them out of the tax. The measure applies to people who were residents on January 1, and departures would face audits by the Franchise Tax Board.11 The retroactive cutoff is also likely to be challenged in court.12

The opposition's spending is enormous. Opponents have raised more than $300 million, nearly a third of it from Brin. That is roughly ten times what supporters have raised.3 Opponents have spent or booked about $96 million in advertising, compared with $209,000 by supporters.8 Brin has given $102 million to Building a Better California, John Doerr $30 million and Eric Schmidt $27 million.6 (The August PitchBook-based report credited Larry Page with the $100 million contribution31, but other reporting consistently names Brin.613)

What the funding data does and doesn't show

Both sides now cite the same venture numbers. Supporters, including the Nobel economists, point to California's growing share as evidence the tax will not wreck Silicon Valley.1 Governor Gavin Newsom also promoted the $366 billion figure in August, saying more than 4,000 California startups had raised more than startups in the other 49 states combined.37 He nonetheless opposes Proposition 40, arguing it would drive away investors and that a national billionaire tax would work better.316

I read the evidence this way: the funding numbers support supporters' claim that the threat of the tax has not stopped capital from flowing in, but they say little about what would happen if the tax actually passed. Venture dollars follow AI talent, and that talent is concentrated in San Francisco in ways that a ballot measure cannot quickly change. The reporting points to the inability of top AI talent and investors to set up elsewhere as California's lasting advantage.39 Still, the money is mostly going into private companies whose founders would be taxed on illiquid equity, and that is the exact group the "leave before the B" warning targets. So far, not many founders have left. A tax bill would test that more seriously than the campaign has.

The state budget is part of the picture. California, unlike the federal government, taxes capital gains at the same rate as ordinary income, so each wave of tech IPOs brings in large state revenue.4 With SpaceX public since June, Anthropic planning an IPO this year and OpenAI possibly following next year2, the state's finances are tied closely to the same startups this funding boom created. Projections now show a $4.5 billion surplus for the fiscal year instead of the $12.6 billion deficit forecast last June.31

What to watch on November 3

The outcome is uncertain. A September Public Policy Institute of California poll found 52% of likely voters supporting Proposition 40 and 46% opposed.2 Two competing measures that could cancel it, Propositions 41 and 42, also had majority support.2 Even if Proposition 40 passes on its own, a court fight over the retroactive residency date is almost certain.12

For startups, the nearer signal will be Q4 funding data and whether Bay Area founders preparing large rounds change where their companies are incorporated or where they live. Through three quarters of a record year, the money has not moved. A disputed tax vote is unlikely to change that before the next earnings cycle, and a court ruling on the residency cutoff could matter more than the vote itself.