Arbiter Secures $52M Seed Round Without VC Funding
Michelle Carnahan — a former senior executive at Eli Lilly and the former president of Thirty Madison — has successfully raised $52 million in seed funding for her new health AI startup Arbiter, according to Business Insider.
Notably, the entire investment came without a single dollar of venture capital, relying exclusively on family offices including TriEdge Investments, MFO Ventures, and private equity firm WindRose Health Investors.
The seed round values Arbiter at $400 million, despite the company being only six months old, with its technology already live and operating with more than 1,000 clinicians.
Arbiter focuses on automating and simplifying administrative workflows within the healthcare sector using AI — from referrals to appointment scheduling — through a platform that aggregates patient data from multiple sources to improve clinical decision-making. Carnahan emphasized that the healthcare industry suffers from deep fragmentation, data silos, and scattered software tools, explaining that her startup aims to become “the conductor of the healthcare orchestra” by unifying these tools into one system.
To accelerate time-to-market, Arbiter acquired a data platform from SecondWave Delivery Systems, along with its customers and several employees — a move that Carnahan says saved 18 months of development and secured multi-year contracted revenue.
Carnahan noted that she didn’t deliberately avoid venture capital. Rather, she turned to family offices for their sector expertise, flexibility, speed of decision-making, and the market access necessary to scale rapidly.
Arbiter is exploring additional acquisitions that offer strong data foundations or complementary capabilities, especially in areas such as prior authorizations or home-based care. The company is also developing a unified operating spine to transform healthcare from reactive to proactive, leveraging predictive AI models capable of forecasting medical events like disease onset or hospital admissions.
Arbiter has assembled a distinguished board and advisory team that includes Dr. Clive Fields, cofounder of VillageMD, and Dr. Ainsley MacLean, former chief medical information officer at Kaiser Permanente. MacLean described Arbiter as “the Palantir of healthcare”, citing its ability to deeply integrate data into real clinical operations.
In essence, Arbiter demonstrates that success in healthcare AI doesn’t always depend on traditional VC funding — but rather on sector insight, strategic partnerships, and a data-driven foundation that accelerates meaningful impact.
