Synthesia: How the AI Startup Reached a US$4bn Valuation

AI video startup Synthesia has secured US$200m in Series E funding – nearly doubling its valuation to US$4bn.

The funding round, led by Google Ventures (GV), brings continued backing from NVentures – the investment arm of NVIDIA – along with Accel, Kleiner Perkins, New Enterprise Associates (NEA), PSP Growth, Air Street Capital, FirstMark and MMC Ventures.

Synthesia has confirmed the latest round strengthens its long-term vision. Co-founded by CEO Victor Riparbelli in 2017, the platform focuses on AI-generated video content for enterprises.

“Synthesia was founded on two core beliefs," says Victor, "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.”

He adds that the investment now supports scaling that mission further: "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.”

Synthesia's raise includes an employee secondary sale facilitated in partnership with NASDAQ. This allows long-standing staff members to sell equity at the new US$4bn valuation, offering liquidity while retaining a share in the firm’s future direction.

Building conversational AI agents

Synthesia aims to use the funding to support enterprise learning, sales enablement and internal communications.

The firm positions itself at the centre of enterprise development, with a focus on training and knowledge-sharing tools. Its AI-powered avatars generate realistic video content, aiming to replace static formats with dynamic and interactive experiences.

Synthesia is now concentrating on building conversational AI agents tailored for learning and development. These agents are designed to respond and interact with employees in real time, supporting faster and more effective upskilling across organisations.

Victor highlights a "unique point in time where technology enables agents that can truly understand and respond” at a time when “enterprises are under unprecedented pressure to reskill and upskill their workforce". 

This shift reflects changing boardroom priorities. Synthesia argues that companies now place internal education and knowledge transfer among their top strategic concerns.

Enterprise traction

Synthesia operates out of London, with its tools already used by over 90% of the Fortune 100. The firm’s clients include major enterprises seeking scalable, accessible and engaging learning platforms.

Its AI-generated videos are used to speed up training, enable product marketing and improve internal communication, offering what the firm claims is greater retention and faster knowledge transfer than traditional formats.

According to Synthesia, user feedback shows “organisations reporting higher engagement and faster knowledge transfer compared to traditional formats”. These performance indicators bolster the company’s pitch that it is building category-defining products for enterprise AI.

The startup's trajectory is also gaining attention from the UK Government. Chancellor of the Exchequer Rachel Reeves calls Synthesia a “UK success story, creating new jobs and opportunities in this country”.

She continues: “It shows that by backing innovators to start, scale and stay in the UK through better access to finance and generous tax reliefs, we can turn the promise of AI into better-paid jobs and long-term growth across the UK.”

Synthesia’s platform uses AI to transform written text into realistic video using avatars. The company claims this makes content production faster and cheaper, while boosting engagement. It plans to move from one-way video to conversational formats that offer two-way interaction, especially in workplace settings.

Backing from long-term investors

Vidu Shanmugarajah, General Partner at Google Ventures, reasons the firm’s long-standing support for Synthesia’s strategy.

“We’ve been partners with Synthesia since the Series B and have long believed in Victor and the team’s vision,” he says. “Today, we’re even more convinced that Synthesia has the product, the team and the traction to become the category leader in AI-powered learning experiences.”

Synthesia maintains that its growth strategy will remain responsible and long-term focused. The company maintains that its approach to AI development will be safe, scalable and grounded in the real needs of businesses.

The combination of technical capability and market demand underpins Synthesia’s next phase of development. It is bidding to become the core platform for AI-led enterprise learning and communication, while continuing to work closely with global organisations.