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Khosla co-leads $86m series D in UK AI voice agent PolyAI

PolyAI has raised US$86 million in a series D round co-led by Georgian, Hedosophia, and Khosla Ventures, with participation from NVentures, British Business Bank, Citi Ventures, Squarepoint Ventures, Sands Capital, Zendesk Ventures, and Point72 Ventures.

The company develops AI-powered voice agents for enterprise customer service.

This latest funding brings PolyAI’s total capital raised to over US$200 million.

PolyAI says its technology is used by more than 100 enterprise customers across 25 countries, with deployments in 45 languages.

🔗 Source: PolyAI

🧠 Food for thought

Implications, context, and why it matters.

PolyAI’s $40 million ARR signals a lower valuation than U.S. peers

  • PolyAI targets $40 million in annualized recurring revenue (ARR) for 2025, with U.S. client revenue set to almost triple 1.
  • UK filings put Generally Accepted Accounting Principles (GAAP) revenue at $8.9 million in 2024 and $15 million in the 12 months to January 31, 2025. Losses rose to $26.6 million from $23.8 million 1.
  • PolyAI carries a $750 million valuation, or about 19x forward ARR. Sierra is a U.S.-based AI customer service startup valued at $10 billion with $100 million ARR, or 100x. Decagon is a U.S.-based AI voice automation startup at a $1.5 billion valuation 1.
  • Revenue grew 2,274% over three years, ranking it #1 AI company in the 2025 Deloitte UK Technology Fast 50 (an annual ranking of the fastest-growing UK tech companies by revenue growth) 2.

IT system integrators can win interactive voice response (IVR) upgrades as AI voice agents spread

  • Enterprise AI voice agents could rise from $3.14 billion in 2024 to $47.5 billion by 2034, a 34.8% compound annual growth rate (CAGR). Gartner pegs $80 billion in cost savings by 2026 3.
  • Healthcare AI voice adoption grows at 37.3% CAGR while retail posts 31.5% 3.
  • Enterprises want integration with customer relationship management (CRM) and enterprise resource planning (ERP) systems. They also need compliance with Service Organization Control 2 (SOC 2) and Health Insurance Portability and Accountability Act (HIPAA). They also need Payment Card Industry Data Security Standard (PCI DSS) and General Data Protection Regulation (GDPR) 3.
  • Return on investment (ROI) often lands within 6 to 12 months, with AI voice agents improving issue resolution by 14% and reducing handling time by 9% 3.

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