Macmillan Cancer Support is a UK charity and foundation-style capital allocator based in London that funds and invests in innovations improving cancer care. Through its Impact Investment Committee, it backs early-stage companies aligned with oncology, HealthTech, biotechnology, AI, data, analytics and life sciences, with a focus on the United Kingdom. It is most relevant for founders building cancer diagnostics, digital health or care-delivery technologies where strategic alignment with patient support and cancer services matters.