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12 startup funding rounds, 17 to 23 August 2026: Castelion's $800m Series C leads

Startups raised $2bn across 12 rounds. Defence & space drew the most money, and North America led by region.

CastelionImage: Castelion
Raised$2bn
Rounds12
Median round$77m
$1bn+ valuations4

We tracked 12 startup funding rounds announced from 17 to 23 August 2026, worth $2bn in disclosed funding.

The largest was Castelion's $800m Series C round, led by JPMorganChase Strategic Investment Group and Andreessen Horowitz. Wispr followed with $280m.

Defence & space startups raised $1.32bn across 4 rounds, and those based in North America raised $1.74bn.

21 August 2026

Starcloud logoStarcloudSeries A · Defence & space · Redmond · led by Manhattan West$250mHelcim logoHelcimSeries C · Fintech · Calgary · led by BDC Growth Venture Fund$38mVessev logoVessevSeries A · Mobility & logistics · Auckland · led by Blackbird Ventures$19m

20 August 2026

Muon Space logoMuon SpaceSeries C · Defence & space · Mountain View · led by Eclipse Capital$250mCityblock Health logoCityblock HealthSeries D+ · Healthtech & bio · New York · led by General Catalyst$116m

19 August 2026

Castelion logoCastelionSeries C · Defence & space · Torrance · led by JPMorganChase Strategic Investment Group$800m

18 August 2026

RezolvSeries A · Fintech · Mumbai · led by Norwest$12.5m

17 August 2026

Wispr logoWisprSeries B · AI · San Francisco · led by Menlo Ventures$280mGravis Robotics logoGravis RoboticsSeries A · Robotics & hardware · Zurich · led by SoftBank$200mTerra Industries logoTerra IndustriesSeed · Defence & space · Abuja$18mPeripheral logoPeripheralSeed · Consumer & media · Toronto · led by Inovia Capital$8.7mJem logoJemSeries A · HR & work · Cape Town · led by Quona Capital$8.4m