UK-based AI video startup Synthesia has nearly doubled its valuation to $4 billion after raising $200 million in a Series E funding round led by Google Ventures, marking a major milestone for Britain’s technology sector. The round comes just a year after the company was valued at $2.1 billion and underscores growing enterprise demand for AI-powered training and communication tools.
Founded in 2017, Synthesia develops software that uses AI-generated avatars to create corporate videos for internal and external use, from compliance and cybersecurity training to onboarding and leadership communications. The London-headquartered company counts around 70% of the FTSE 100 among its clients, alongside organisations such as the NHS, the European Commission, and the United Nations. Synthesia crossed $100 million in annual recurring revenue in 2025 and reported $58.3 million in revenues in 2024, while continuing to invest heavily in headcount, technology, and international expansion.
The latest round was led by Google Ventures, with participation from new investors Evantic and Hedosophia, as well as existing backers including Accel, Kleiner Perkins, New Enterprise Associates, Nvidia’s NVentures, PSP Growth, and Air Street Capital. Total funding to date now exceeds $500 million. CEO and co-founder Victor Riparbelli said the capital will be used to expand into conversational AI agents aimed at learning and upskilling inside large organisations. “We see a rare convergence of two major shifts: a technology shift with AI agents becoming more capable, and a market shift where upskilling and internal knowledge sharing have become board-level priorities,” he said.
Co-founder and COO Steffen Tjerrild emphasized that the valuation jump reflects sustained execution rather than AI hype. “Existing investors have seen the progress, have seen the numbers, have seen them compound year over year,” he said, adding that the round represented validation from long-term backers rather than speculative enthusiasm. As part of the deal, Synthesia will also allow employees to sell secondary shares through a structured process facilitated by Nasdaq, giving staff liquidity while the company remains private.
With more than 500 employees and offices across Europe and the US, Synthesia is positioning itself beyond AI-generated videos and toward interactive, agent-driven workplace learning. The funding round places the company among the most valuable private tech firms in the UK and highlights how enterprise-focused AI applications are translating rapid adoption into sustained commercial growth.