Sunstone Partners

General contacts
Investor type

PE / VC

Founded

2015

AUM

$1 700 M

Location

San Mateo, California, United States

Investment Ticket

$50-100 m

Investment Stage

Series B Seed Late Stage (Series C+)

Region of investment

North America Europe Africa Asia
Investor profile last updated: 14 July, 2026

Profile

Sunstone Partners is a growth-oriented private equity firm based in the United States, established in 2015. The team comprises individuals with over 70 years of cumulative experience in investing and supporting technology firms. They focus on fostering a collaborative, entrepreneur-friendly environment that respects and supports founder journeys. Sunstone offers strategic guidance and operational best practices to help portfolio companies grow effectively.

The firm invests in technology-enabled services and software companies, typically in businesses with $20M+ revenue and over 20% growth. They engage in both majority and minority investments with typical check sizes ranging from $75M to $200M. Sunstone Partners manages $1.7 billion in committed capital across its first three funds and aims to accelerate organic growth and fund acquisitions.

Notable investments include companies like Onica, OSF Digital, Peloton, and Avertium. They focus on delivering value and support through active participation and strategic input to drive the success of their portfolio companies.

Industry

Technology AI Software SaaS Internet and Web Services IT Services HealthTech

Contacts

Name
Title
Email
Social Networks
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Gus Alberelli Сo-Founder & Managing Director
Сo-Founder & Managing Director
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Investment-team contacts for Sunstone Partners — including verified work emails and LinkedIn profiles — are available to Private Equity List subscribers.
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FAQs about Sunstone Partners

Sunstone Partners is a venture capital and private equity firm. It backs companies at Series B, Seed and Late Stage (Series C+), writing tickets of $50-100 m.
Sunstone Partners is located in San Mateo, California, United States.
Sunstone Partners was founded in 2015.
Sunstone Partners invests in companies and startups in Technology, AI, Software, SaaS, Internet and Web Services, IT Services, HealthTech.
Sunstone Partners invests in companies and startups in North America, Europe, Africa, Asia.
Sunstone Partners invests in companies and startups at Series B, Seed, Late Stage (Series C+).
Sunstone Partners usually invests $50-100 m on average.
Sunstone Partners has around $1 700m assets under management.
Sunstone Partners can be reached through its website sunstonepartners.com and its LinkedIn page. Its general enquiries address is [email protected]. Cold-mailing a general inbox rarely reaches a partner, so Private Equity List also lists the investment-team contacts for Sunstone Partners — names, roles, verified work emails and LinkedIn profiles — available on a Pro plan from $129/month (see pricing). Contacts are sourced from the firm's website and LinkedIn and re-verified on a rolling cycle. Spot a stale contact, or none at all? Report it — we re-run that firm within 48h and get back to you.
Yes. Every field on this page — profile, funds, investment criteria, portfolio and investment-team contacts — is available programmatically through the Private Equity List REST API and MCP server, so AI assistants such as Claude and ChatGPT can query Sunstone Partners directly instead of scraping this page. One subscription covers both the web app and machine access — see API & MCP.
Private Equity List re-verifies investor profiles on a rolling cycle, pulling from the firm's own website and LinkedIn rather than a one-off import. This profile was last updated on 14 July, 2026. Something out of date here? Report it — we re-run that firm within 48h and get back to you.