43 is an accelerator and venture capital firm. Based in San Francisco, California, United States. Known portfolio companies include Cimphony, Insight Health, PressBox, Onton, Kaiden AI and Hypernatural, 8 companies in all.
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Investment focus
- Sector
- AIHealthcareSaaS
Who to pitch at 43
43 portfolio companies (8)
- Cimphony
- Insight Health
- PressBox
- Onton
- Kaiden AI
- Hypernatural
- Riza
- Secludy
Co-investors
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About 43
The firm's listing covers sectors AI, Healthcare and SaaS, and focus areas AI Applications, Digital Health, Enterprise SaaS and Machine Learning; known deals cluster at Pre-Seed, Seed and Series A.
Dustin Dolginow (Founder and Investor) and Soso Sazesh (Co-Founder) are listed as the contacts to pitch at 43.
Across the known portfolio, 15 co-investors appear alongside 43, including Umami Capital, Eudemian Ventures and Relay Ventures.
Frequently asked questions
What is 43?
43 is an accelerator and venture capital firm based in San Francisco, California, United States, with a known portfolio of 8 companies. The portfolio comes from public investment records rather than from the firm, so deals that never surfaced publicly are not in it.
What does 43 invest in?
Listed sectors include AI, Healthcare and SaaS; listed focus areas include AI Applications, Digital Health, Enterprise SaaS and Machine Learning. Those tags come from the portfolio attached to the firm, so they describe what has been backed rather than a stated mandate for what comes next.
What stage does 43 invest at?
The known deals of 43 include Pre-Seed, Seed and Series A rounds. Check that against your own round before reaching out: stage mismatch is the most common reason a well matched sector still goes nowhere.
Who should I pitch at 43?
Both people on file at 43 are listed as contacts for the firm, each with their own profile page.
How do I contact 43?
Any email address on file for the firm is masked on this page and readable inside RaiseHunt after you create an account. The 2 people attached to the firm have their own pages, each showing whether an address is on file for them.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal