Sunstone Partners is a private equity firm. Based in San Mateo, California, United States. The known portfolio counts 10 companies, including 123 Baby Box, OSF Digital, Cardior Pharmaceuticals, EverService, MeetingPlay and NetSPI.
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Investment focus
Who to pitch at Sunstone Partners
Sunstone Partners portfolio companies (10)
- 123 Baby Box
- OSF Digital
- Cardior Pharmaceuticals
- EverService
- MeetingPlay
- NetSPI
- Progeny Health
- Vcheck Global
- Accuhealth Technologies
- KMS Technology
Co-investors
Funds that share portfolio companies with Sunstone Partners.
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About Sunstone Partners
The firm's listing covers sectors Commerce, Consumer, Healthcare and SaaS, and focus areas CRM Systems, Children, Cloud Infrastructure and Commerce Enablement; known deals cluster at Growth, Late-Stage and Pre-Seed.
Of the 15 people on file at Sunstone Partners, Mike Biggee (Co-Founder and Managing Partner), Gustavo Alberelli (Co-Founder & Managing Partner) and Arneek Multani (Co-Founder & Managing Partner) are listed as the contacts to approach first.
Across the known portfolio, 6 co-investors appear alongside Sunstone Partners, including Camden Partners, SLC Angels and Crescent Ventures.
Frequently asked questions
What is Sunstone Partners?
Sunstone Partners is a private equity firm based in San Mateo, California, United States, with a known portfolio of 10 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 Sunstone Partners invest in?
Listed sectors include Commerce, Consumer, Healthcare and SaaS; listed focus areas include CRM Systems, Children, Cloud Infrastructure and Commerce Enablement. 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 Sunstone Partners invest at?
The known deals of Sunstone Partners include Growth, Late-Stage and Pre-Seed 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 Sunstone Partners?
3 of the 15 people on file at Sunstone Partners are listed as contacts for the firm. All 15 have their own profile page.
How do I contact Sunstone Partners?
Any email address on file for the firm is masked on this page and readable inside RaiseHunt after you create an account. The 15 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