Monthly roundup · United Kingdom · September 2026

Startup funding in the United Kingdom, September 2026: TEKEVER's $580M Series D leads 46 rounds

By Millionrounds ResearchPublished 1 October 2026Updated 5 November 2026

We read 46 equity rounds raised in the United Kingdom and announced in September 2026, raising $1.8B between them: 13% of the rounds we read worldwide that month and 5% of the money. The largest was TEKEVER's $580M Series D, led by Baillie Gifford and UC Investments. The median seed round was $4.7M, against $3.2M over the last twelve months in the United Kingdom; at Series A it was $26M. Mercia Asset Management led the most rounds, with 3.

Equity rounds46raised in the United Kingdom, 45 with an amount
Raised$1.8Bacross those rounds
Lead named76%of rounds say who led
Share of the world13%of rounds; 5% of the money

The biggest rounds

  1. 1TTEKEVERSeries D · led by Baillie Gifford, UC Investments$580M
  2. 2Open CosmosGrowth · led by ETF Partners, Trill Impact$346M
  3. 3BBrahma AIGrowth · led by Multiples$150M
  4. 4Basecamp ResearchSeries C · led by S32$140M
  5. 5Penelope HealthSeries A · led by Thoreau$100M
  6. 6MetaviewSeries C · led by Insight Partners$60M
  7. 7OMass TherapeuticsSeries C$53M
  8. 8Aptadir TherapeuticsSeed · led by 4BIO Capital$46M
  9. 9JJack & JillSeries A · led by Air Street Capital$40M
  10. 10MicrobioticaSeries C · led by British Business Bank$35M

Day by day

Equity rounds raised in the United Kingdom and announced each day of September. The busiest day was 16 September, with 6.

1 September30 September

By stage, against the year

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

Pre-seed7$2.2Mthis month$1.8M12 months here
Seed19$4.7Mthis month$3.2M12 months here
Series A4$26Mthis month$13M12 months here
Series B5$16Mthis month$42M12 months here
Series C4$57Mthis month$100M12 months, worldwide
Series D1$580Mthis month$150M12 months, worldwide
Growth6$20Mthis month$24M12 months here

The most active leads

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

In what

AI was the busiest sector in the United Kingdom.

Against the world

  • Rounds, the United Kingdom46
  • Rounds, worldwide357
  • Raised, the United Kingdom$1.8B
  • Raised, worldwide$39B

The whole of September 2026

Other countries in September

116 roundsUnited States→ 25 roundsIndia→ 21 roundsCanada→ 13 roundsGermany→ 11 roundsAustralia→ 9 roundsFrance→ 9 roundsChina→