London-based AI video platform, Synthesia, has secured $200 million in Series E funding at a $4 billion valuation, nearly doubling its worth from just 12 months ago and cementing its position as one of Britain’s most valuable artificial intelligence companies.
The round was led by Google Ventures, with participation from Evantic, the venture fund founded by former Sequoia partner Matt Miller, and Hedosophia. Existing investors, including Accel, Kleiner Perkins, New Enterprise Associates, NVentures (Nvidia’s venture capital subsidiary), PSP Growth, Air Street Capital, and MMC Ventures, also joined the Series E round.
Speaking about this new funding, Victor Riparbelli, co-founder and chief executive, Synthesia, said:
Synthesia was founded on two core beliefs: first, that AI will bring the cost of content creation down to zero. And secondly, that AI video provides a better, more engaging way for organisations to communicate and learn. This funding round is about scaling that vision. 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. We intend to build the defining company at that intersection, by combining our know-how in AI video with our ability to build and integrate AI technologies into products and services that solve real business needs.
The deal marks Synthesia’s second major fundraising in just over a year, according to a news report by Agile Nation News, with the company raising $180 million in a Series D round in January 2025 that valued it at $2.1 billion.
Founded in 2017 by Victor Riparbelli and Steffen Tjerrild, Synthesia’s platform allows enterprises to create studio-quality videos using AI-generated avatars, eliminating the need for cameras, studios, or actors. The technology is now used by over 90% of Fortune 100 companies for corporate communications, training, and marketing.
The company has experienced explosive growth throughout 2025, with annual recurring revenue surpassing $100 million in April.
As part of the current transaction, Synthesia will facilitate an employee secondary share sale in partnership with Nasdaq, with all shares sold at the same $4 billion valuation as the Series E round.
Daniel Kim, chief financial officer, Synthesia, said:
This secondary is first and foremost about our employees. It gives employees a meaningful opportunity to access liquidity and share in the value they’ve helped create, while we continue to operate as a private company focused on long-term growth.
Synthesia plans to deploy the new capital to develop conversational AI agents designed for organisational learning and upskilling. These systems will enable employees to interact with company knowledge through questions and scenario-based role-play, moving beyond traditional passive training materials.
The company, which became a unicorn in 2023, now employs over 500 people across offices in London, New York, Copenhagen, Amsterdam, Zurich, and Munich. It generates a substantial portion of its revenue from the United States.
In July 2025, Synthesia opened a 20,000 square foot London headquarters, with Mayor of London Sadiq Khan and Business Secretary Peter Kyle attending the launch event.
