London-based AI startup Synthesia has closed a $200m (£151.7m) funding round that has valued it at $4bn, according to reports.
Sources close to the company reportedly told Forbes that existing Synthesia investor Google Ventures (GV) led the round.
A valuation of $4bn would place the company close to the most valuable AI businesses in the country, surpassing autonomous driving software firm Wayve, currently valued at $3bn.
Synthesia, known for its realistic human-like AI generated avatars, has seen rapid growth in 2025. The firm raised £146m in a funding round in January and since then has seen its annual recurring revenue (ARR) skyrocket past $100m (£76m).
Co-founder and chief executive Victor Riparbelli said in a social media post on Wednesday that the company achieved $2m in ARR in a single day earlier this month. Synthesia claims its technology is used by over 90% of Fortune 100 companies, including Zoom, Bosch and Heineken.
In July the company opened its new London headquarters, a 20,000 sq ft workspace opened in a ceremony attended by Mayor of London Sir Sadiq Khan and Business Secretary Peter Kyle, then serving as head of the Department for Science, Innovation and Technology (DSIT).
Earlier this month saw reports that Adobe had discussed plans to acquire Synthesia in a $3bn deal that was ultimately rejected.
