Lithium Technologies

Lithium Technologies

Paul Hsu founded Lithium Technologies in 2008 to back early-stage companies where software intersects with regulated or physical-world complexity. The firm emerged from Hsu's own operating experience and early angel investments, building a concentrated portfolio that spans enterprise SaaS, digital health infrastructure, and applied AI. Khosla Ventures anchored an early $15 million fund (public record), signaling institutional conviction in the firm's technical due diligence and founder-first sourcing model. The firm's strategy targets Seed through Series B companies in enterprise software, AI/ML applications, and climate-adjacent hard tech. Lithium typically leads or co-leads rounds with initial checks from $500,000 to $3 million, reserving significant follow-on capacity for conviction positions. Known portfolio companies include Ro, the vertically integrated digital health platform, and Abnormal Security, the AI-native email defense firm. Geographic focus remains US-centric, with deal flow concentrated in San Francisco, New York, and Boston. Lithium operates with a lean team built around Hsu's personal network of repeat founders and technical operators. The firm does not publicly disclose total assets under management or a deployment pace. A notable structural feature is its reliance on operator-LPs — current and former founders who provide both capital and direct sourcing advantages — rather than a traditional institutional LP base. No adjacent philanthropic vehicle or formal club structure has been publicly disclosed. Lithium's structural differentiator is a near-exclusive reliance on founder referrals and technical co-investors for deal origination. The firm does not operate a standard marketing or origination function, instead sourcing through Hsu's direct relationships and the operator networks of its limited partners. This constrains volume but produces portfolio density in tightly defined technical sub-sectors.