Monthly roundup · United States · June 2026

Startup funding in the United States, June 2026: Prometheus's $12B Series B leads 106 rounds

By Millionrounds ResearchPublished 1 July 2026Updated 5 November 2026

We read 106 equity rounds raised in the United States and announced in June 2026, raising $26B between them: 43% of the rounds we read worldwide that month and 74% of the money. The largest was Prometheus's $12B Series B. The median seed round was $10M, against $8.5M over the last twelve months in the United States; at Series A it was $29M. General Catalyst led the most rounds, with 3.

Equity rounds106raised in the United States, 102 with an amount
Raised$26Bacross those rounds
Lead named86%of rounds say who led
Share of the world43%of rounds; 74% of the money

The biggest rounds

  1. 1PrometheusSeries B$12B
  2. 2BasetenGrowth · led by Spark Capital, Wellington Management$1.5B
  3. 3AAppsFlyerSeries E$1.0B
  4. 4Maxwell PowerGrowth · led by Fairtide Partners$750M
  5. 5CCyeraGrowth · led by Temasek Holdings, Evolution Equity Partners$600M
  6. 6SupabaseSeries F · led by GIC$500M
  7. 7Impulse SpaceSeries D · led by 137 Ventures, BANNER VC$500M
  8. 8FFlourishGrowth · led by Google Ventures, Lux Capital$500M
  9. 9HHelionGrowth · led by Thrive Capital$465M
  10. 10NewLimitSeries C · led by Founders Fund$435M

Day by day

Equity rounds raised in the United States and announced each day of June. The busiest day was 3 June, with 9.

1 June30 June

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-seed3$2.9Mthis month$3.0M12 months here
Seed19$10Mthis month$8.5M12 months here
Series A29$29Mthis month$25M12 months here
Series B19$68Mthis month$60M12 months here
Series C15$100Mthis month$100M12 months here
Series D2$450Mthis month$170M12 months here
Growth14$278Mthis 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 States106
  • Rounds, worldwide245
  • Raised, the United States$26B
  • Raised, worldwide$35B

The whole of June 2026

Other countries in June

31 roundsUnited Kingdom→ 9 roundsAustralia→ 8 roundsIndia→ 8 roundsGermany→ 7 roundsNetherlands→ 6 roundsFrance→ 6 roundsSpain→