William Ou

Active Investor

Founder at Astera

São Paulo, Brazil

William Ou, Founder at Astera is an active investor based in São Paulo, Brazil. This profile covers what William Ou backs, at which stage, and how founders can reach out in 2026.

Investor type: AngelInvestor
Stages: Pre SeedSeed
Invests in: FintechPaymentsHealthcare & BiotechDigital Health & HealthTechBiotech & PharmaMedTech & Medical DevicesSaaS & EnterpriseCrypto & Web3
Location: São Paulo, Brazil
Typical check: $150K
Past investments: 2

Notable investments

MonolithZiO Health

How to reach William Ou

Angels and operators like William Ou reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded.

Frequently Asked Questions

What does William Ou invest in?

William Ou invests in Fintech, Payments, Healthcare & Biotech and Digital Health & HealthTech, typically at Pre Seed and Seed. Match your sector and stage, then reach out with a personalized pitch.