The Bay Area Now Takes 51% of Every AI Venture Dollar. And 53% of Every B2B Dollar.

We all know SF is back, and the center of AI and AI+B2B. Carta’s latest data reinforces it.

Carta just released its Startup Ecosystem Leaderboard covering the $124 billion invested into startups on its platform from July 2025 through June 2026. The Bay Area took 41.3% of all of it. That’s $51.3 billion into companies headquartered in one metro. New York, the clear #2, took 18.0%. Boston took 8.7%.

So the Bay Area pulls almost 2.5x the capital of the entire New York ecosystem across every category combined. But the category breakdown is what matters if you’re building or funding in B2B and AI.

In AI and B2B, the Concentration Gets More Extreme, Not Less

The Bay Area takes 41.3% of startup capital overall. Filter down to the two categories that actually run this cycle and its share goes up:

AI: Bay Area takes 51.5% SaaS / B2B: Bay Area takes 53.2%

The Bay Area over-indexes on AI and B2B by roughly 10 to 12 points versus its already-dominant overall share. More than half of every dollar going into AI startups, and more than half of every dollar going into B2B, lands in a single metro. The rest of the country splits what’s left.

Add New York and It’s Basically Over

Stack the top two metros together:

AI: Bay Area 51.5% + New York 16.0% = 67.5% B2B: Bay Area 53.2% + New York 19.0% = 72.2%

Two cities take roughly 7 out of every 10 B2B venture dollars in the country. Boston holds a steady #3 in both categories at 8.3% in AI and 8.4% in B2B, and then it falls off a cliff. #4 in AI is Austin at 4.3%. #5 is LA at 4.3%. Everyone below the top three is fighting over low single digits.

It’s a power law at the metro level, the same shape as the returns inside a fund.

The One Real Exception: Fintech Belongs to New York

One category on the board breaks the pattern. In fintech, New York takes 58.9% and the Bay Area is #2 at 20.8%. New York wins fintech by nearly 3x.

Fintech is a proximity-to-capital-markets business, a proximity-to-banks business, a proximity-to-regulators business. The customers and the specialized talent sit in New York, so the money follows.

That’s the useful signal for founders. Capital concentrates where the customers and the specialized talent already are, not where the cost of living is lowest. AI and B2B infrastructure talent still concentrates in the Bay Area. Financial services talent concentrates in New York. The map follows the talent, and the talent hasn’t moved.

What This Actually Means If You’re Building B2B or AI

A few practical takeaways, because “SF is back” isn’t the useful part.

If you’re raising a competitive AI or B2B round, geography is still a variable. Not a requirement, but a variable. More than half the dollars in your category sit in one metro, and the density of Series A and B investors who write conviction checks in AI infra and B2B is not evenly distributed, no matter how many funds say they invest anywhere. When you’re raising a hot round, being in the room still matters more than most want to admit.

The distributed, no-HQ model works for building. It’s weaker for fundraising signaling. You can run a great remote company, and plenty do. But the fundraising market still rewards proximity in the two hottest categories, and this data shows it tightening, not loosening.

If you’re outside the top three metros, lean into your category, not your zip code. LA has real consumer and media gravity. Austin has real hardware and infrastructure pull. Being the obvious best company in your category pulls the top-two funds to you regardless of where you’re headquartered. They travel for a great B2B company.

For LPs and emerging managers: “we invest everywhere” is often a returns problem, not a virtue. The dollars follow the density because the outcomes follow the density. Spreading a portfolio thin across 15 metros to look diversified is a good way to miss the companies that generate the fund.

The Narrative Was Wrong Because It Measured the Wrong Thing

The “everyone’s leaving” story measured cost of living, office vacancy, and U-Haul rates. Real things, but not what drives venture outcomes.

Venture concentration measures where the capital chases the outcomes. In AI and B2B, the two categories driving this entire cycle, mid-2026 is more concentrated than it was five years ago. Bay Area 51.5% in AI. 53.2% in B2B. Two metros taking 72% of B2B dollars combined.

The talent didn’t disperse and the capital didn’t disperse. The narrative got ahead of the numbers.

Data: Carta, Startup Ecosystem Leaderboard, $124B invested July 2025–June 2026, ranked by capital into startups HQ’d in each metro.