# Sunstone Partners

Sunstone Partners is a Private Equity based in San Mateo, United States.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** San Mateo, United States
- **Region:** North America
- **Address:** San Mateo, CA, United States
- **Founded:** 2015
- **Assets under management:** $1B–$2.5B (Altss estimate)
- **Website:** sunstonepartners.com
- **LinkedIn:** https://www.linkedin.com/company/sunstone-partners

## Regulatory record

- **CRD number:** 305064
- **SEC file number:** 801-117367
- **Registration status:** Registered
- **Reports private funds:** Yes
- **IAPD record:** https://adviserinfo.sec.gov/firm/summary/305064

## About

Sunstone Partners is an SEC-registered investment adviser in San Mateo, CA, registered since 2019. The firm manages approximately $1.6 billion in regulatory assets. It has 39 employees and 24 investment advisers.

## Sectors

- Enterprise Software
- Cybersecurity
- Digital Health
- FinTech

## People

- Mike Biggee — Co-Founder & Managing Partner
- Arneek Multani — Co-Founder & Managing Partner

## Questions

### How does Sunstone Partners source proprietary deal flow?

Sunstone's sourcing model relies on a narrow sector focus — technology-enabled services and healthcare services — combined with founder-direct origination in the lower mid-market. By targeting companies with $5 million to $25 million in EBITDA, the firm operates beneath the auction-process threshold that dominates deals above $100 million in enterprise value. The co-founders' fifteen-plus-year network across West Coast and national technology-services ecosystems provides repeat founder and intermediary introductions.

### Does Sunstone Partners participate in fund commitments or only direct deals?

Sunstone makes direct control and significant minority equity investments in operating companies. The firm does not operate a fund-of-funds program or take limited-partner stakes in external private equity vehicles. Its capital goes entirely into company-level transactions, with equity checks ranging from $30 million to $200 million per platform investment.

### How is Sunstone Partners related to GI Partners?

Sunstone Partners was founded in 2015 by Mike Biggee and Arneek Multani, who previously served as managing directors at GI Partners, a San Francisco-based private equity firm. Sunstone is an independent entity with no shared limited-partner reporting lines, co-investment vehicles, or carried-interest structures linking it to GI Partners. The spinout was amicable, and the firms operate entirely separate investment programs.

## Related profiles

- [Sun Capital Partners](https://altss.com/profile/sun-capital-partners)
- [Sunvest Investments](https://altss.com/profile/sunvest-investments)

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Last updated: 2026-06-03T20:00:00.000Z

Canonical page: https://altss.com/profile/sunstone-partners

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