London-based AI video platform, Synthesia, has raised $200 million in Series E funding at a $4 billion valuation, almost doubling the company’s worth from a year ago.
The round was led by existing investor Google Ventures, with participation from Evantic, the venture capital firm founded by former Sequoia partner Matt Miller, and Hedosophia. Other returning investors include NVentures (Nvidia’s venture capital arm), Accel, Kleiner Perkins, New Enterprise Associates, PSP Growth, Air Street Capital and MMC Ventures.
Founded in 2017 by Victor Riparbelli and Steffen Tjerrild, Synthesia develops AI-generated avatar technology for corporate training and communication. The company, which counts Bosch, Merck and SAP among its enterprise clients, crossed $100m in annual recurring revenue in April 2025.
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 as AI agents become more capable, and a market shift in which 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 funding marks Synthesia’s second major raise within 13 months, following a $180m Series D in January 2025 that valued the company at $2.1bn. According to Sifted, the company has now raised over $500m in total funding.
As part of the transaction, Synthesia will facilitate an employee secondary share sale in partnership with Nasdaq. Unlike typical secondary sales, which often occur at prices disconnected from official valuations, all employee shares will be sold at the same $4bn valuation as the Series E round.
Daniel Kim, chief financial officer, Synthesia, explained:
“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.”
Alexandru Voica, head of corporate affairs and policy, Synthesia, added:
“My guess is that as [UK-based] private companies stay private longer, this type of structured, cross-border employee liquidity may become increasingly common, so I wouldn’t be surprised to see others do it, either with Nasdaq or others.”
The company plans to use the new capital to develop conversational AI agents designed for organisational learning and upskilling. These agents will enable employees to interact with company knowledge through questions, scenario exploration via role-play, and tailored explanations, rather than passively consuming traditional training materials.
