Fortress Ventures — Pre-Seed VC Firm ($300K–$1.0M Checks)
Fortress Ventures is a Pre-Seed venture capital firm based in San Francisco, CA investing in Other, AI / ML. The firm typically writes $300K–$1.0M checks.
- Check size
- $300K–$1.0M
- Partners
- 2 listed
- Stage
- Pre-Seed
- Sectors
- Other, AI / ML
- HQ
- San Francisco, CA
- AUM
- Not in our records
Last verified: 2026-09-10
Pre-Seed
$300K – $1.0M
2 partners
Investment Thesis
Invests in next-gen application security and AI-driven SaaS solutions.
How Fortress Ventures invests
Fortress Ventures is a vc firm based in San Francisco, CA. The firm invests at the Pre-Seed stage, with a focus on Other, AI / ML.
Fortress Ventures typically writes checks of $300K–$1.0M per investment.
Partners & Team
Mark Marlow
Executive Managing
Tom Johnson
Managing Partner
Industry Focus
Invests In
- •Raising at Pre-Seed? You're squarely in their sweet spot.
- •Lead with your fit in Other, AI / ML — the sectors they actively back.
- •Size your ask to their typical $300K – $1.0M check.
- •cold outreach ok
- •Address your outreach to a specific partner, such as Mark Marlow, Executive Managing.
- •A warm introduction beats a cold email. Get matched and request an intro.
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