London-based AI video creation platform Synthesia has raised $200 million (£146m) in a new funding round led by Google Ventures (GV), pushing its valuation to $4 billion.
The investment makes the business one of the UK’s most valuable AI companies and follows a prior £146m Series D round in January 2025.
That round valued the company at $2.1bn and its latest deal highlights the rapid rise of the now-UK giant amid the AI boom.
The latest round also saw participation from Evantic, the venture fund founded by former Sequoia partner Matt Miller, and Hedosophia.
Other existing investors NVentures (NVIDIA’s venture capital arm), Accel, Kleiner Perkins, New Enterprise Associates (NEA), PSP Growth, Air Street Capital and MMC Ventures also participated.
As part of the transaction, the business will also facilitate an employee secondary sale in partnership with NASDAQ at a $4bn valuation.
It plans to use the capital to “build a category-defining company that will transform how employees learn”, helping in areas such as enterprise learning and development, knowledge sharing, product marketing and sales enablement with the help of agentic systems.
Synthesia’s platform allows enterprises to produce studio-quality videos using AI avatars, removing the need for cameras, studios or actors.
The company’s technology is used by over 90% of Fortune 100 companies to streamline corporate communications, training, and marketing.
The business, which has featured regularly on BusinessCloud’s MediaTech 50 ranking, has experienced surging growth throughout 2025, with ARR surpassing $100m.
Co-founder and CEO, Victor Riparbelli, recently revealed that Synthesia achieved $2min ARR in a single day.
It became a unicorn in 2023 and, with January’s funding, kickstarted plans to grow in several markets including Japan, Australia, Europe and North America.
Synthesia now employs over 500 people across offices in London, New York, Copenhagen, Amsterdam, Zurich and Munich, and generates a large portion of its revenue from the US.
In July, the company opened a 20,000 sq ft London headquarters, with Mayor of London Sadiq Khan and Business Secretary Peter Kyle among the guests at its launch.
“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 organizations to communicate and learn,” said Riparbelli.
“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 UK’s Chancellor of the Exchequer, Rachel Reeves, added: “Synthesia is a UK success story, creating new jobs and opportunities in this country.
“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.”