The Legal AI Index
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№ 16 · Tier 2 · Large International / NationalArchitect

Simmons & Simmons

Built proprietary Percy AI platform.

Platforms in use
ProprietaryFlank
Proprietary tools and programmes
  • Percy AI

    Built on Azure OpenAI. Percy 2.0 launched Feb 2025 with document upload, enhanced inference engine, document comparison. RAG-based. Now 1,125 unique fee-earner users (Feb 2026), up from 827 a year earlier. 20+ FTEs working on Percy. Used by whole firm, not just lawyers.

  • Stride

    AI-backed digital regulation tracker, launched Feb 2026. Replaces 200+ page PDF tracker with web platform; filterable by jurisdiction, sector, technology theme; queryable via API/MCP for integration with other tools and AI assistants.

ALSP & NewLaw arm
Simmons Adaptive
Flexible resourcing
Launched 2014

Partner-led flexible resourcing of consultant lawyers and non-legal professionals (project management, compliance, company secretarial) on defined client assignments. Hong Kong added 2022, Singapore 2023.

Visit Simmons Adaptive
What is happening
  • ·Senior Partner publicly stated AI will disrupt pricing models.
  • ·Market-leading AI advisory practice ranked in Legal 500.
  • ·Reorganised Solutions practice during 2025 - was standalone, now integrated throughout firm. Legal engineers placed in core practice areas, dedicated developers sit with IT. 76 embedded specialists.
  • ·Exploring commercial future for Percy (update expected Q2 2026).
  • ·Predictive lawyering - exploring use of client data to anticipate legal issues (e.g. retail/hospitality cost pressures triggering loan/lease term review).
  • ·Partnership with Flank to build AI agents; plans to develop more in 2026.
  • ·Winlaw: 'I do see a world in the future, like 2027 probably, where clients will have their own agents that they ask to get work done, and we want our Simmons agents to be ready to respond to that demand.'
Sources