Monthly roundup · United States · August 2026

Startup funding in the United States, August 2026: Thrive Holdings's $2.0B Growth leads 93 rounds

By Millionrounds ResearchPublished 1 September 2026Updated 4 November 2026

We read 93 equity rounds raised in the United States and announced in August 2026, raising $17B between them: 42% of the rounds we read worldwide that month and 67% of the money. The largest was Thrive Holdings's $2.0B Growth, led by SoftBank BB Corp and Altimeter. The median seed round was $17M, against $8.5M over the last twelve months in the United States; at Series A it was $35M. General Catalyst led the most rounds, with 3.

Equity rounds93raised in the United States, 92 with an amount
Raised$17Bacross those rounds
Lead named84%of rounds say who led
Share of the world42%of rounds; 67% of the money

The biggest rounds

  1. 1Thrive HoldingsGrowth · led by SoftBank BB Corp, Altimeter$2.0B
  2. 2HadrianGrowth · led by Valor Equity Partners, JP Morgan Chase$1.4B
  3. 3River AISeries A · led by General Catalyst, AMP PBC$1.1B
  4. 4Valar AtomicsSeries B · led by Sequoia Capital$1.0B
  5. 5BBase PowerSeries D · led by Valor Equity Partners, Ribbit Capital$1.0B
  6. 6CastelionSeries C · led by Andreessen Horowitz, JP Morgan Chase$800M
  7. 7Form EnergySeries G · led by T. Rowe Price$750M
  8. 8LumilensSeries C · led by Bain Capital Ventures, Spark Capital$700M
  9. 9WhatnotGrowth · led by Greycroft$545M
  10. 10AntaresSeries C · led by Paradigm, Caffeinated Capital$470M

Day by day

Equity rounds raised in the United States and announced each day of August. The busiest day was 4 August, with 13.

1 August31 August

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-seed7$5.7Mthis month$3.0M12 months here
Seed12$17Mthis month$8.5M12 months here
Series A23$35Mthis month$25M12 months here
Series B19$55Mthis month$60M12 months here
Series C12$132Mthis month$100M12 months here
Series D8$160Mthis month$170M12 months here
Growth8$223Mthis 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 States93
  • Rounds, worldwide220
  • Raised, the United States$17B
  • Raised, worldwide$25B

The whole of August 2026

Other countries in August

24 roundsUnited Kingdom→ 12 roundsAustralia→ 9 roundsCanada→ 8 roundsIndia→ 8 roundsBrazil→ 5 roundsChina→