British artificial intelligence startup Synthesia has raised US$200 million in a Series E funding round, bringing its valuation to US$4 billion, nearly doubling from the US$2.1 billion valuation it held just a year ago. The round was led by Google Ventures (GV) with participation from existing investors including Accel, Kleiner Perkins, New Enterprise Associates (NEA), NVIDIA’s NVentures, Air Street Capital and PSP Growth, as well as new backers such as Evantic and Hedosophia.
The London-based company, founded in 2017, provides an AI video platform that enables businesses to create professional training, internal communications and knowledge-sharing videos using AI-generated avatars. It has seen rapid commercial adoption, with over 70 percent of Fortune 100 companies among its clients and annual recurring revenue exceeding US$100 million as of April 2025.
As part of the transaction, Synthesia is facilitating an employee secondary share sale in partnership with Nasdaq at the US$4 billion valuation, giving long-standing team members an opportunity to convert some of their private company equity into cash while retaining ownership stakes in the business. Nasdaq’s role is to facilitate the secondary sale, not to take the company public.
The fresh capital will be used to expand Synthesia’s AI offerings, including tools that go beyond static video generation toward more interactive AI agents that allow employees to engage with content through role-play and conversational scenarios. CEO and co-founder Victor Riparbelli described the funding as positioning the company to build category-defining products that help organisations scale learning, knowledge sharing and communications through generative AI.
Synthesia’s growth reflects a continued appetite from investors for enterprise-focused AI applications, even as broader technology markets face pressure. The company’s valuation and cash-out opportunity for employees show how London-based AI firms are carving out significant positions in global markets while offering liquidity options before traditional exits such as public listings or acquisitions.
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