Sigma Group

Sigma Group

Patrick Carney established Sigma Group in 1994. The firm operates from Princeton, New Jersey, with additional offices in San Mateo, Pasadena, Durham, and Sherman Oaks. Sigma Group structures itself as a multi-family office, pooling capital from a select circle of wealthy families to pursue direct investments and fund commitments. The firm concentrates on venture capital and growth equity, deploying across enterprise software, AI/ML, digital health, fintech, and climate technology. Sigma Group predominantly accesses deals through co-investment rights with established venture funds, acting as a limited partner that writes side-by-side checks with general partners. The firm does not lead rounds or manage in-house funds. Its geographic footprint spans North America, with deal flow concentrated in Silicon Valley, the New York metro area, and emerging hubs like Durham's Research Triangle. Sigma Group maintains a deliberately lean headcount across five offices. The firm does not disclose assets under management or total deployment — a posture common among family offices operating below institutional radar. Patrick Carney partners with Tom Senter in managing the investment portfolio. The partnership structure keeps decision-making centralized, with no external investment committee or advisory board publicly identified. Sigma Group's structural differentiator lies in its longevity and narrowness. The firm has operated for three decades without expanding into wealth-management services, estate planning, or in-house fund formation. By limiting its function to co-investment execution, Sigma Group avoids the conflicts and bureaucracy of larger multi-family offices — and retains access to top-tier venture funds that prize quiet, stable limited partners.