Sunstone Partners

Sunstone Partners is a growth-oriented private equity firm specializing in majority and minority investments in AI- and technology-enabled services and software companies. The firm targets businesses with over $20 million in revenue, demonstrating more than 20% growth and capital efficiency, typically deploying check sizes between $75 million and $200 million. Key focus sectors include cloud computing, cybersecurity, healthcare IT, and marketing technology, where the firm partners with exceptional entrepreneurs—often as their first institutional capital provider—to drive organic expansion and acquisitions.

Founded in 2015 and headquartered in San Mateo, California, Sunstone Partners emerged from the team that previously collaborated at Trident Capital, a multi-stage investment firm managing $1.9 billion across seven funds since 1993. Originally known as TC Growth Partners, the firm was established by co-founders including Gus Alberelli, Mike Biggee, and Arneek Multani, leveraging over 70 years of collective experience in technology investments to support scalable growth in North American technology businesses. With $1.7 billion in committed capital across its first three funds, Sunstone emphasizes a founder-friendly approach, earning recognition on Inc. magazine's list for five consecutive years through collaborative support and operational expertise.

The firm's portfolio features notable investments such as Clearwater, a cybersecurity and compliance provider for healthcare and defense, where Sunstone acquired majority ownership in 2025; TelliHealth, formed via the 2024 combination of Accuhealth Technology and SignalLamp Health for remote patient monitoring; and Thirdera, sold to Cognizant in 2024. Prior exits include AlienVault (acquired by AT&T), Teladoc (NYSE: TDOC), and ProgenyHealth, alongside healthcare-focused companies like Knowtion Health and ArroHealth. These investments highlight successful outcomes in healthcare IT and cybersecurity, with recent activity including add-on acquisitions and liquidity events.

Sunstone Partners' team comprises seasoned professionals with deep roots in technology investing, led by Managing Partners Gus Alberelli, Mike Biggee, and Arneek Multani, alongside Partners Julian Hinderling and Ankur Rathi. Supporting roles include operating partners like Scott Hammack and Jeff Rich, a robust portfolio operations team headed by Sean Lenahan, and investment professionals such as Vice Presidents Chris Caguin and Luis Espinoza. This diverse group, exceeding 30 members, draws from Trident Capital experience to deliver strategic guidance, talent acquisition, and operational best practices to portfolio companies.