Proof Ventures

Proof Ventures

Proof Ventures was established by Michael Levinthal, who spent ten years as a General Partner at Mayfield Fund, a top-tier venture capital firm. The firm is structured as a multi-family office, concentrating on investments in early-stage technology companies, with offices in New York, San Francisco, Exton, and Toronto. It pools capital from a network of high-net-worth families to pursue direct venture investments and co-investments alongside established venture capital firms. The firm's investment strategy targets Series A and B stage companies, with a particular focus on software, AI, and digital health sectors. Known co-investments include participation in rounds alongside Accel and Lightspeed Venture Partners. Proof Ventures has backed companies such as Pager, a digital health platform, and Ladder, a life insurance technology firm (per S&P Capital IQ, 2023). Geographic focus is predominantly North America, spanning the United States and Canada. Deployment data remains undisclosed, but the firm maintains a lean team of investment professionals across its four offices. Proof Ventures operates as a standalone entity, with no publicly disclosed adjacent philanthropic or operating arms. The firm's approach is to aggregate capital from multiple families to provide meaningful check sizes in venture rounds, operating similarly to a syndicate but with a more permanent capital base. A key structural differentiator is Proof Ventures' hybrid model: it functions as a curated club of families that co-invest alongside each other, rather than as a commingled fund. This allows each family to maintain direct ownership of portfolio company stakes, offering tax and flexibility advantages. The firm's multigenerational focus—many families have been with the office since inception—provides a stable, long-term capital base.