Alex Duff, Managing Partner at Fortius Ventures is an active investor based in San Francisco, California. This profile covers what Alex Duff backs, at which stage, and how founders can reach out in 2026.
Managing Partner at Fortius Ventures. Previously worked in venture and growth investing for the Bechtel family office (Fremont Group), then served as a C-level executive at Fremont portfolio companies
Alex Duff invests in SaaS & Enterprise, Fintech and Artificial Intelligence, typically at Seed and Series A.
- Investor type
- VC
- Stages
- SeedSeries A
- Invests in
- SaaS & EnterpriseFintechArtificial Intelligence
- Location
- San Francisco, California
- Typical check
- $625K
How to reach Alex Duff
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Round Funded. "Alex Duff." Round Funded investor database, updated November 3, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/alex-duff
Frequently Asked Questions
Who is Alex Duff?
Alex Duff, Managing Partner at Fortius Ventures is an active investor based in San Francisco, California. Alex Duff invests in SaaS & Enterprise, Fintech and Artificial Intelligence, typically at Seed and Series A.
What does Alex Duff invest in?
Alex Duff invests in SaaS & Enterprise, Fintech and Artificial Intelligence, typically at Seed and Series A. Match your sector and stage, then reach out with a personalized pitch.
What stage does Alex Duff invest at?
Alex Duff typically invests at Seed and Series A. Lead with traction that fits the stage when you reach out.
What is Alex Duff's typical check size?
Alex Duff typically writes checks around $625K. Use it as a signal for whether your raise fits their stage.
How do founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.