AI/Fastest growing

PolyAI

Builds voice AI agents that answer customer service calls for large companies.

Why it's here

Raised an $86M Series D in Dec 2025 led by Georgian, Hedosophia and Khosla; 100+ enterprise customers and 2,000+ live deployments.

Focus: Voice AI
Founded: 2017
Total raised: $200M+source: poly.ai
Latest round: Series D, $86M, Dec 2025
Team size: 201-500 people
London office: 3 Sheldon Square, London, Westminster W2 6HYsource: poly.ai
London presence: HQsource: techcrunch.com
Investors: Georgian (lead), Hedosophia (lead), Khosla Ventures (lead), British Business Bank, Citi Ventures, NVentures, Point72 Ventures, Sands Capital, Squarepoint Ventures, Zendesk Venturessource: poly.ai
Recognised on: Deloitte UK Technology Fast 50 2025, #14source: deloitte.co.uk
Sifted 100 UK & Ireland 2024, #14source: content.sifted.eu
Tech Nation Future Fifty 2024source: technation.io
Deloitte UK Technology Fast 50 2024, #15source: deloitte.co.uk
Area: Paddington
Nearest station: Paddington, 436 m
Companies House: POLYAI LIMITED (11048129, active)Incorporated 6 Nov 2017 · SIC 62012
Visas: Licensed visa sponsor, listed as PolyAI Limitedsource: gov.uk
Elsewhere: LinkedIn ↗X ↗

For PolyAI