Runway

Runway builds generative AI models for video and media, best known for its physics-aware text-to-video systems (the Gen line, most recently Gen 4.5) offering high-definition generation, native audio, multi-shot sequences, character consistency and editing tools. Founded in New York in 2018 by Cristobal Valenzuela, Alejandro Matamala-Ortiz and Anastasis Germanidis, it raised roughly $1B in total, including a $315M Series E led by General Atlantic at a $5.3B valuation in 2026. Runway is establishing London as its European headquarters and has pledged more than $200M into the UK AI ecosystem by 2028. Customers include the BBC, Fremantle and WPP, and it targets filmmakers, studios and creative professionals.