TriEdge family office invests in Arbiter’s $52 million seed round

Arbiter, a New York-based healthcare AI startup, has emerged from stealth with a sizable $52 million seed funding round – an unusually large seed round entirely backed by private family capital. The investment was co-led by TriEdge Investments and MFO Ventures, both acting as family office investors, alongside participation from WindRose Health Investors (a healthcare-focused private equity firm) and other industry operators. The financing values the six-month-old company at $400 million. Arbiter was founded by Michelle Carnahan, a former president of Thirty Madison and a veteran of Eli Lilly, who deliberately raised this round without traditional venture capital involvement. By tapping family offices, Arbiter secured patient capital from investors who bring deep healthcare expertise and a long-term perspective. The startup’s platform addresses the costly fragmentation in healthcare systems by orchestrating care coordination between patients, providers, and payers. Arbiter’s technology integrates clinical and financial data into a unified longitudinal patient record and uses AI to automate next-best actions like referrals, authorizations, and scheduling. With its first application focused on optimizing site-of-care decisions (in partnership with a national insurer and major provider networks), Arbiter has already onboarded over 1,000 clinicians. The fresh funds will be used to accelerate product development and expand operations, as the company aims to rebuild healthcare’s “operating spine” and improve patient outcomes through seamless, data-driven coordination.

About the TriEdge family office

TriEdge Investments is a single-family office that served as a lead investor in Arbiter’s seed round. While details about TriEdge’s principals are not publicly disclosed, the firm operates as the private family office investment arm with interests in innovative technologies. TriEdge is led by CEO Simcha Hyman, who previously led the family office “The Portopiccolo Group” until 2024. By co-leading a $52 million financing at an early stage, TriEdge is providing Arbiter with substantial runway and aligning with the startup’s mission to transform healthcare coordination. This deal illustrates a growing trend of family offices stepping in to fund startups in lieu of traditional VCs, offering founders not just capital but also flexibility and strategic guidance. The round also saw participation of MFO Ventures, the 2022-launched family office of Dr. Eric Moskow.

Picture Source: Unsplash+ (November 24th, 2025)
Article source: Finsmes (November 24th, 2025)