Endgame Capital

Investment decisions are led by the two General Partners, John Mairlot and Jinna Li. Mairlot brings climate-tech investing experience from Aqua-Spark, where he deployed over €30 million, while Li is a former entrepreneur who founded and exited startups in sustainable packaging. The pair operates as a husband-and-wife team, which the firm states creates full alignment on capital deployment and conviction.

Endgame participates in both direct investments at the pre-seed and seed stages and syndicate-based investments. The firm's website lists a 'Fund Investments' category alongside direct portfolio companies, though it does not disclose fund commitment sizes or the GPs it backs. Direct tickets range between €250,000 and €750,000 per company.

Every company Endgame backs must demonstrate a technological pathway to reducing at least 50 million tons of CO₂ equivalent per year by 2050. The firm also screens for additionality across social resilience, planetary boundaries, and nature and ecosystem regeneration, but the 50-megaton threshold is its primary quantitative hurdle.

Endgame avoids any climate technology that relies on regulation, subsidy, or consumer goodwill for adoption. The firm calls its investment targets 'climate-denier-proof,' meaning it will not back solutions that cannot outcompete incumbent fossil-fuel economics on cost, speed, and performance alone. This functionally rules out many early-stage carbon capture, policy-dependent hydrogen, and premium green-product plays.

There is no disclosed philanthropic foundation or separate impact vehicle tied directly to Endgame Capital. The firm's stated impact philosophy is embedded within its for-profit investment mandate, requiring that portfolio companies hit specific greenhouse-gas reduction benchmarks and broader sustainable-development-goal alignment without a separate nonprofit arm.

The firm's website and public records name SOSV, Hoxton Ventures, and Breakthrough Energy Ventures as co-investors. These relationships appear tied to specific portfolio companies — Hoxton Ventures co-invested in Everbloom, while Breakthrough Energy Ventures is flagged as a Tier 1 co-investment partner for select deals.

Endgame sources through three channels: a scout network of climate-tech experts, investors, and researchers; an operator-LP base of unicorn-scale founders and executives who refer companies; and the INSEAD alumni network, where Jinna Li is active in the INDEVOR global impact community. Li also serves as an ambassador for ClimateHack, a professional network focused on climate innovation.