Alexander Duff
Solo GP · Orinda, CA
Alexander Duff is a solo GP based in Orinda, CA, investing at pre-seed, seed stage. Alexander Duff's most recent fund with a disclosed size, Fortius Ventures Fund I, LP, filed a $15.2M offering with the SEC in Sep 2023. Alexander Duff has 2 funds and deal vehicles on SEC file. Estimated typical check: $150K–$450K. Alexander Duff has dated investing activity in the last 12 months (latest Nov 2025).
Why Alexander Duff is listed
Named as one of two individuals (Manager of the General Partner of the Issuer) on the Form D for Fortius Ventures Fund II, LP, a venture fund (Nov 2025) (2 vehicles on file).
Source: SEC Form D: Fortius Ventures Fund II, LP (Nov 25, 2025) · 1 more source
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- Stages
- Pre-seed, Seed
- Typical check (est.)
- $150K–$450K
- Latest fund
- $15.2M · Sep 2023
- Latest dated activity
- Nov 2025
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What does Alexander Duff invest in?
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Funds and deal vehicles Alexander Duff filed with the SEC
Sources
- SEC Form D: Fortius Ventures Fund II, LPNov 25, 2025
- SEC Form D: Fortius Ventures Fund I, LPSep 22, 2023
Data refreshed from public sources Oct 15, 2026. Is this you? Remove or correct this profile.