Monthly roundup · Cybersecurity · October 2026

Cybersecurity startup funding, October 2026: Upwind's $400M Series C leads 28 rounds

By Millionrounds ResearchPublished 1 November 2026

We read 28 equity rounds in Cybersecurity announced in October 2026, raising $1.3B between them: 4% of all the rounds we read that month and 2% of the money. The largest was Upwind's $400M Series C, led by Bessemer Venture Partners. The median seed round was $7.0M, against $10M over the last twelve months in Cybersecurity; at Series A it was $13M.

Equity rounds28in Cybersecurity, 26 with an amount
Raised$1.3Bacross those rounds
Lead named86%of rounds say who led
Share of the month4%of rounds; 2% of the money

The biggest rounds

  1. 1UUpwindSeries C · United States · led by Bessemer Venture Partners$400M
  2. 2AArmadinSeries B · United States · led by Andreessen Horowitz, Accel$256M
  3. 3SolinkGrowth · Canada · led by Vertu Capital$100M
  4. 4BlackwallSeries C · United Kingdom · led by AVP$100M
  5. 5&TruthSeed · United States$70M
  6. 6CasapSeries B · United States · led by General Catalyst, Base10 Partners$56M
  7. 7Reach SecuritySeries B · United States · led by Top Tier Capital Partners$50M
  8. 8Harmonic SecuritySeries B · United States · led by Crosspoint Capital Partners$50M
  9. 9InfisicalSeries B · United States · led by Elad Gil$40M
  10. 10HadrianSeries B · Netherlands · led by ForgePoint Capital, Smartfin$40M

Day by day

Equity rounds in Cybersecurity announced each day of October. The busiest day was 29 October, with 5.

1 October31 October

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-seed4$3.7Mthis month$2.0M12 months, all sectors
Seed10$7.0Mthis month$10M12 months here
Series A4$13Mthis month$25M12 months here
Series B6$50Mthis month$58M12 months here
Series C2$250Mthis month$100M12 months, all sectors
Growth2$100Mthis month$113M12 months, all sectors

Where

United States had the most Cybersecurity rounds this month.

Against the month

  • Rounds, Cybersecurity28
  • Rounds, all sectors733
  • Raised, Cybersecurity$1.3B
  • Raised, all sectors$59B

The whole of October 2026

Other sectors in October

411 roundsAI→100 roundsFintech→72 roundsHealthcare→67 roundsSoftware→67 roundsRobotics→56 roundsManufacturing→44 roundsSaaS→44 roundsConstruction→42 roundsHardware & Electronics→41 roundsBiotech→34 roundsBig Data & Analytics→33 roundsEnergy→33 roundsLogistics→32 roundsEnterprise Software→29 roundsAerospace & Space→29 roundsHealthtech→26 roundsDefence Tech→25 roundsCloud→24 roundsEntertainment→23 roundsB2C→23 roundsFinancial Services→22 roundsMedical Devices→20 roundsCleantech→19 roundsE-commerce→19 roundsFood & Beverage→18 roundsReal Estate→18 roundsDeeptech→18 roundsSemiconductors→17 roundsAgtech→16 roundsDeveloper Tools→15 roundsWeb3 & Crypto→15 roundsRetail→15 roundsMartech→14 roundsSupply Chain→14 roundsInsurtech→14 roundsTelecoms→14 roundsClimate Tech→13 roundsRegtech→13 roundsAutomotive & EVs→13 roundsChemicals & Materials→12 roundsFuture of Work→12 roundsB2B→12 roundsMedia→12 roundsGaming→11 roundsProfessional Services→11 roundsMarketplaces→11 roundsHR Tech→11 roundsEducation→11 roundsSalestech→10 roundsProptech→10 roundsPharma→10 roundsFashion→10 roundsTravel & Hospitality→