British AI startup Synthesia has raised $200 million in Series E funding at a $4 billion valuation, nearly doubling its worth from $2.1 billion just a year ago, while facilitating an employee stock sale through Nasdaq.
Unlike many AI startups still burning cash, Synthesia has built a profitable business transforming corporate training through AI-generated avatars. With enterprise clients including Bosch, Merck, and SAP, the London-based company crossed $100 million in annual recurring revenue in April 2025.
The Series E round was led by existing investor GV (Google Ventures), with participation from previous backers including Kleiner Perkins, Accel, New Enterprise Associates, Nvidia’s NVentures, Air Street Capital, and PSP Growth. New investors Matt Miller’s VC firm Evantic and the secretive VC firm Hedosophia are joining the cap table.
Synthesia is facilitating an employee secondary sale in partnership with Nasdaq. Nasdaq isn’t acting as a public exchange but as a private markets facilitator helping early team members convert shares into cash. All sales will be tied to the same $4 billion valuation as the Series E, giving the company control over the process. Employee stock sales often happen outside this framework at prices either below or above official valuations.
“This secondary is first and foremost about our employees,” Synthesia CFO Daniel Kim said. “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 is expanding beyond expressive videos into AI agents. The company is developing agents that will let clients’ employees “interact with company knowledge in a more intuitive, human-like way by asking questions, exploring scenarios through role-play, and receiving tailored explanations.” Early pilots have received positive feedback, with customers reporting higher engagement and faster knowledge transfer compared to traditional formats.
Founded in 2017, Synthesia now has more than 500 team members, a 20,000-square-foot headquarters in London, and additional offices in Amsterdam, Copenhagen, Munich, New York City, and Zurich. Co-founder and CEO Victor Riparbelli said: “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.”
Synthesia’s head of corporate affairs Alexandru Voica predicted that as UK private companies stay private longer, structured employee liquidity programs may become increasingly common. The approach offers employees financial returns without forcing the company into premature public offerings or uncertain secondary markets.
