Rankings & Data
Comprehensive firm rankings by fee income, partners, and employees. Filter by segment, search by name, and track year-over-year movements.
The Definitive Intelligence Platform for UK Accountancy
Track 66,917+ UK accountancy firms. Analyse £35bn+ in market value. Predict tomorrow's leaders with data-driven insights powered by Companies House, Accountancy Age, and dedicated research.
Firmology covers 66,917+ UK accountancy firms with 15 years of historical data (2010–2025), sourced from Companies House, Accountancy Age, and proprietary research by The AIR Network.
Sign Up Free Login- 66,917+ Firms Tracked
- £41bn+ Market Value
- 15 Years of Data
- 100+ Page Reports
Top UK Accountancy Firms
- PwC — 6353000.00
- Deloitte — 5676000.00
- EY — 3780000.00
- KPMG — 2990000.00
- Workwell (formerly JSA) — 1175021.00
Everything You Need to Understand the UK Accountancy Market
From comprehensive rankings to predictive analytics, Firmology provides the intelligence you need to make informed decisions.
Firms Explorer
Search, filter, and map all 70,000+ UK accountancy firms. Drill into financials, office locations, group structures, and full company history.
Contacts Explorer
Search 100,000+ directors, company secretaries, and persons with significant control linked to accountancy firms — with map and role filtering.
Industry Analysis
Deep-dive into market trends, diversity metrics, service line performance, M&A activity, and competitive positioning across all segments.
Growth Forecasts
AI-powered predictions with confidence scores, trend analysis, scenario planning, and accuracy tracking for smarter decision-making.
International Networks COMING SOON
Explore international accounting networks and associations, and see which UK accountancy firms belong to each network's membership.
Cross-Region Comparison COMING SOON
Compare firms and markets across territories. Benchmark the UK accountancy market against the United States with the Firmology US edition — each market reported in its native currency.
UK Accountancy Market Intelligence — Built for Firms, Vendors & Investors
Whether you're benchmarking, selling, or investing, Firmology delivers the UK accountancy insights you need.
For Accountants & Firm Leaders
- Benchmark your firm against competitors
- Explore the full market with Firms Explorer
- Identify M&A targets and growth opportunities
- Track ranking movements and positioning
- Generate board-ready PDF reports
For Accounting Software Vendors
- Identify high-growth firms for sales targeting
- Find key decision-makers via Contacts Explorer
- Understand market segmentation
- Track technology adoption trends
- Export data for CRM integration
For Investors & M&A Advisors
- Comprehensive due diligence via Firms Explorer
- Research firm leadership with Contacts Explorer
- Historical growth patterns and CAGR
- Acquisition activity tracking
- Predictive analytics for timing
UK Accountancy Firm Data — Powerful Features, Professional Results
Explore the capabilities that make Firmology the definitive platform for UK accountancy intelligence.
Interactive UK Map
Visualise firm locations across the UK with our interactive map. Click on markers to view firm details, filter by segment, and identify geographic clusters of accounting expertise.
- Clickable markers with firm information
- Filter firms by market segment
- Geographic clustering visualisation
- Zoom and pan navigation
Historical Tracking
Access 15 years of historical data from 1–2026. Track year-over-year changes, compare performance across time periods, and identify long-term trends in the UK accountancy market.
- 15 years of comprehensive data
- Year-over-year comparisons
- Historical ranking movements
- Growth trend analysis
Multi-Format Export
Generate professional reports in multiple formats. Export to Excel for data analysis or create 100+ page PDF reports with charts, tables, and executive summaries for board presentations.
- Professional PDF reports
- Excel data exports
- Custom chart generation
- Executive summary sections
Predictive Analytics
Leverage AI-powered predictions to forecast future rankings and growth. Get 5-year projections with confidence scores, trend analysis, and scenario planning capabilities.
- 5-year growth forecasts
- Confidence scoring system
- Trend direction indicators
- What-if scenario analysis
Built on Official Data Sources
Firmology aggregates and analyses data from multiple authoritative sources, ensuring accuracy and reliability for critical business decisions.
- Companies House — Official UK Registry
- Accountancy Age — Industry Rankings
- In-house Research — Dedicated Analysis
- AI Research — Advanced Analytics
- Firm Submitted Data — Direct Submissions
UK Accountancy Intelligence — Frequently Asked Questions
Everything you need to know about Firmology and UK accountancy market intelligence.
What is Firmology?
Firmology is a UK accountancy intelligence platform that tracks and analyses over 70,000 UK accountancy firms. It provides firm rankings by fee income, 15 years of historical financial data, leadership contacts, AI-powered growth forecasts, and accounting software market share analysis. Data is sourced from Companies House, firm submitted data, and proprietary research by The AIR Network.
How many UK accountancy firms does Firmology cover?
Firmology covers over 70,000 UK accountancy firms registered with Companies House, spanning all market segments from the Big Four to sole practitioners and regional practices. The database is updated regularly as new financial filings and data become available.
What data sources does Firmology use?
Firmology aggregates data from five primary sources: Companies House (the official UK government company registry), in-house research conducted by The AIR Network, AI-assisted data analysis, and firm-submitted data provided directly by accountancy practices. This combination ensures both breadth of coverage and depth of sector-specific insight.
How does Firmology compare to Dun & Bradstreet, Bureau van Dijk, or Accountancy Age?
Firmology is the only platform dedicated exclusively to the UK accountancy sector. Unlike general company databases such as Dun & Bradstreet or Bureau van Dijk (Orbis), Firmology combines Companies House financial data with proprietary sector-specific analysis and ranking system — including AI-powered growth forecasts, accounting software market share data, and M&A activity tracking specific to UK accountancy practices.
Does Firmology include financial data for accountancy firms?
Yes. Firmology includes 15 years of historical financial data sourced from Companies House filings, covering fee income, headcount, compound annual growth rate (CAGR), and year-over-year ranking movements. Data is available from 2010 to the present for qualifying firms, enabling long-term trend analysis and competitive benchmarking.
Can I export accountancy firm data from Firmology?
Yes. Firmology supports data export in multiple formats, including Excel spreadsheets for data analysis and 100+ page professional PDF reports with charts, tables, and executive summaries — suitable for board presentations, sales briefings, and M&A due diligence. Exports can be customised by firm segment, region, and date range.
Who is Firmology designed for?
Firmology is designed for three primary audiences: UK accountancy firms and firm leaders seeking competitive benchmarking and market positioning data; accounting software vendors targeting UK accountancy practices for sales and marketing intelligence; and private equity firms, M&A advisors, and investors evaluating UK accountancy firm acquisition targets or sector investment opportunities.
Can I find directors and key contacts at UK accountancy firms?
Yes. Firmology's Contacts Explorer covers 100,000+ directors, company secretaries, and key personnel linked to tracked UK accountancy firms, with role and job-title filtering and map-based discovery. Firmology also tracks international accounting networks and their member firms, so you can explore a network's footprint alongside its people.
Does Firmology cover other regions and markets?
Yes. Firmology offers UK and US editions, and supports cross-region comparison so you can benchmark the UK accountancy market against the United States. Each market is reported in its native currency with its own rankings, financial data and contacts — see the Firmology US edition at firmology.ai/us.
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