Monthly roundup · United States · September 2026

Startup funding in the United States, September 2026: Crusoe's $3.9B Series F leads 116 rounds

By Millionrounds ResearchPublished 1 October 2026Updated 5 November 2026

We read 116 equity rounds raised in the United States and announced in September 2026, raising $25B between them: 32% of the rounds we read worldwide that month and 65% of the money. The largest was Crusoe's $3.9B Series F, led by Valor Equity Partners and Atreides Management. The median seed round was $13M, against $8.5M over the last twelve months in the United States; at Series A it was $29M. Andreessen Horowitz led the most rounds, with 5.

Equity rounds116raised in the United States, 108 with an amount
Raised$25Bacross those rounds
Lead named83%of rounds say who led
Share of the world32%of rounds; 65% of the money

The biggest rounds

  1. 1CrusoeSeries F · led by Valor Equity Partners, Atreides Management$3.9B
  2. 2TThe Boring Co.Growth$3.0B
  3. 3CognitionSeries E · led by Andreessen Horowitz, Accel$2.0B
  4. 4InstinctSeries C$1.0B
  5. 5Stoke Space TechnologiesSeries E · led by Spark Capital, Point72 Ventures$1.0B
  6. 6GroqGrowth · led by Disruptive$750M
  7. 7Angle HealthSeries C · led by Vitruvian Partners$600M
  8. 8Mach IndustriesSeries C$600M
  9. 9HarveyGrowth · led by Lightspeed Venture Partners, Diffusion$550M
  10. 10TemporalSeries E · led by Lightspeed Venture Partners, Tiger Global Management$550M

Day by day

Equity rounds raised in the United States and announced each day of September. The busiest day was 15 September, with 11.

1 September30 September

By stage, against the year

Each stage's median this month beside its twelve-month median: the United States's own where we hold enough rounds for a benchmark, otherwise the worldwide one.

Pre-seed6$3.4Mthis month$3.0M12 months here
Seed25$13Mthis month$8.5M12 months here
Series A25$29Mthis month$25M12 months here
Series B19$64Mthis month$60M12 months here
Series C17$150Mthis month$100M12 months here
Series D5$125Mthis month$170M12 months here
Growth13$350Mthis month$200M12 months here

The most active leads

Firms that led two or more of the month's rounds in the United States.

In what

AI was the busiest sector in the United States.

Against the world

  • Rounds, the United States116
  • Rounds, worldwide357
  • Raised, the United States$25B
  • Raised, worldwide$39B

The whole of September 2026

Other countries in September

46 roundsUnited Kingdom→ 25 roundsIndia→ 21 roundsCanada→ 13 roundsGermany→ 11 roundsAustralia→ 9 roundsFrance→ 9 roundsChina→