Monthly roundup · Cybersecurity · August 2026

Cybersecurity startup funding, August 2026: Horizon3's $250M Series E leads 11 rounds

By Millionrounds ResearchPublished 1 September 2026Updated 9 October 2026

We read 11 equity rounds in Cybersecurity announced in August 2026, raising $664M between them: 5% of all the rounds we read that month and 3% of the money. The largest was Horizon3's $250M Series E, led by New Enterprise Associates and NightDragon. The median seed round was $8.2M, against $10M over the last twelve months in Cybersecurity; at Series A it was $13M.

Equity rounds11in Cybersecurity, 11 with an amount
Raised$664Macross those rounds
Lead named73%of rounds say who led
Share of the month5%of rounds; 3% of the money

The biggest rounds

  1. 1Horizon3Series E · United States · led by New Enterprise Associates, NightDragon$250M
  2. 2SocureGrowth · United States$156M
  3. 3CodeRabbitSeries C · United States · led by Atomico, Smash Capital$143M
  4. 4YardstikSeries B · United States · led by Harbert Growth Partners$30M
  5. 5Prevalent AIGrowth · United Kingdom · led by Integrity Growth Partners$22M
  6. 6BaselayerSeries A · United States$20M
  7. 7TTerra IndustriesSeed · Nigeria · led by 8VC$18M
  8. 8Apate.AISeed · Australia · led by Lobby Capital$8.2M
  9. 9FalkinSeed · United Kingdom$7.2M
  10. 10VelatirSeries A · Denmark · led by Spintop Ventures, Ugly Duckling Ventures$5.8M

Day by day

Equity rounds in Cybersecurity announced each day of August. The busiest day was 3 August, with 2.

1 August31 August

By stage, against the year

Each stage's median this month beside its twelve-month median: the sector's own where we hold enough rounds for a benchmark, otherwise the one across all sectors.

Pre-seed1$3.6Mthis month$2.0M12 months, all sectors
Seed3$8.2Mthis month$10M12 months here
Series A2$13Mthis month$25M12 months here
Series B1$30Mthis month$58M12 months here
Series C1$143Mthis month$100M12 months, all sectors
Growth2$89Mthis month$113M12 months, all sectors

Where

United States had the most Cybersecurity rounds this month.

Against the month

  • Rounds, Cybersecurity11
  • Rounds, all sectors220
  • Raised, Cybersecurity$664M
  • Raised, all sectors$25B

The whole of August 2026

Other sectors in August

117 roundsAI→32 roundsFintech→24 roundsRobotics→21 roundsConstruction→18 roundsHealthcare→18 roundsSoftware→17 roundsEnergy→14 roundsLogistics→14 roundsBig Data & Analytics→13 roundsDefence Tech→12 roundsEnterprise Software→12 roundsCloud→11 roundsCleantech→11 roundsBiotech→10 roundsClimate Tech→