# 30 leading accounting firms in London

Tamtam tracks 105 accounting firms headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by EY, KPMG UK and PwC UK. Their median headcount is 1,358. Half of them were founded in 1945 or later.

This selection of accounting firms in London includes large global networks and significant national providers. EY, for instance, is a global organization offering assurance, consulting, and tax services across 150 countries. KPMG UK focuses on tax, audit, and advisory, while PwC UK builds trust through professional services. Azets provides advisory, accounting, and HR solutions across Northern Europe, and BDO UK offers tax, audit, and business advisory services.

The firms listed are predominantly large professional services organizations, many with a global reach. A notable pattern is the historical presence of several firms, with BDO UK founded in 1903, Grant Thornton UK in 1904, Moore Global in 1907, MHA in 1880, and S&W in 1881, indicating a long-established financial services sector in London.

🇬🇧 London · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [EY](https://www.tamtam.ai/c/ey) (ey.com)<br>A global organization with diverse teams in over 150 countries provides assurance, consulting, law, strategy, tax, and transactions to help clients grow and transform | Professional Services | 🇬🇧 London | 404,207 |  |
| 2 | [KPMG UK](https://www.tamtam.ai/c/kpmg-uk) (kpmg.com)<br>A leading UK provider of tax, audit, and advisory services with a global presence, focusing on innovative solutions and expertise for clients' needs | Business Consulting and Services | 🇬🇧 London | 15,102 | 1987 |
| 3 | [PwC UK](https://www.tamtam.ai/c/pwc-uk) (pwc.co.uk)<br>Professional services firm focusing on building trust in society and solving important problems through partnership and commercial expertise. | Accounting | 🇬🇧 London | 10,873 |  |
| 4 | [Azets](https://www.tamtam.ai/c/azets) (azets.com)<br>A leading professional services firm in Northern Europe, providing advisory, accounting, audit, HR, recruitment, outsourcing, and technology solutions to clients | Accounting | 🇬🇧 London | 7,523 |  |
| 5 | [BDO UK](https://www.tamtam.ai/c/bdo-uk) (bdo.co.uk)<br>Provides tax, audit, assurance, accounting, business advisory, and outsourcing services to diverse sectors with a client-focused, innovative approach. | Accounting | 🇬🇧 London | 6,800 | 1903 |
| 6 | [Grant Thornton UK](https://www.tamtam.ai/c/grant-thornton-uk) (grantthornton.co.uk)<br>Providing assurance, tax, and advisory services through a global network, combining local insight with flexible, client-focused solutions. | Accounting | 🇬🇧 London | 5,972 | 1904 |
| 7 | [Davies](https://www.tamtam.ai/c/davies) (davies-group.com)<br>Specialist professional services and technology firm providing risk management, business process optimization, and digital transformation solutions to insurance, regulated, and global businesses | Insurance | 🇬🇧 London | 5,693 |  |
| 8 | [RSM UK](https://www.tamtam.ai/c/rsm-uk) (rsmuk.com)<br>Professional services network providing expertise, resources, and client-focused solutions to empower businesses with confidence and deep understanding. | Accounting | 🇬🇧 London | 5,025 | 1988 |
| 9 | [RSM](https://www.tamtam.ai/c/rsm) (rsm.global)<br>Global network providing assurance, tax, and consulting services focused on middle-market businesses with client-centric, insightful, and resource-sharing approach. | Professional Services | 🇬🇧 London | 4,090 | 1964 |
| 10 | [Moore Global](https://www.tamtam.ai/c/moore-global) (moore-global.com)<br>Global accounting and advisory firm with over 37,000 professionals in 114 countries, dedicated to helping clients thrive through expert guidance and support | Accounting | 🇬🇧 London | 3,884 | 1907 |
| 11 | [MHA](https://www.tamtam.ai/c/mha) (mha.co.uk)<br>Offers financial and business strategy services to enterprises and individuals, supporting growth, success, and sustainable wealth creation globally. | Accounting | 🇬🇧 London | 3,439 | 1880 |
| 12 | [Sumer](https://www.tamtam.ai/c/sumer) (sumer.co.uk)<br>Championing small to medium UK and Ireland businesses by uniting expert firms to provide collaborative support and growth solutions. | Accounting | 🇬🇧 London | 2,608 |  |
| 13 | [S&W](https://www.tamtam.ai/c/s-and-w) (swgroup.com)<br>Financial and professional services firm specializing in wealth management, accountancy, tax advisory, and investment management solutions. | Professional Services | 🇬🇧 London | 2,218 | 1881 |
| 14 | [Crowe UK](https://www.tamtam.ai/c/crowe-uk) (crowe.com)<br>Providing audit, tax, advisory, and consulting services with deep market knowledge to businesses, nonprofits, pension funds, and private clients. | Accounting | 🇬🇧 London | 1,518 |  |
| 15 | [Moore Kingston Smith](https://www.tamtam.ai/c/moore-kingston-smith) (mooreks.co.uk)<br>Providing multi-disciplinary advisory, tax, and audit services to diverse clients locally and internationally, fostering positive change and understanding. | Accounting | 🇬🇧 London | 1,358 |  |
| 16 | [Xeinadin](https://www.tamtam.ai/c/xeinadin) (xeinadin.com)<br>Providing expert business advice infused with technology and global expertise, Xeinadin Group empowers companies to reach their strategic objectives efficiently | Accounting | 🇬🇧 London | 1,323 | 2019 |
| 17 | [Saffery](https://www.tamtam.ai/c/saffery) (saffery.com)<br>A partner-led top 20 accountancy firm specializing in corporate finance, entrepreneurs, and international clients, committed to long-term relationships and tailored strategies | Accounting | 🇬🇧 London | 1,322 | 1855 |
| 18 | [Interpath](https://www.tamtam.ai/c/interpath) (interpath.com)<br>Providing expertise and creative solutions for critical business decisions, guiding clients towards the right path quickly | Financial Services | 🇬🇧 London | 1,220 |  |
| 19 | [No Comment](https://www.tamtam.ai/c/no-comment) (europa-recht.eu)<br>An independent firm providing comprehensive accounting services to clients in various sectors, including taxation, audit, bookkeeping, and payroll processing with a personalized approach | Accounting | 🇬🇧 London | 1,191 | 1998 |
| 20 | [Menzies LLP](https://www.tamtam.ai/c/menzies-llp) (menzies.co.uk)<br>Leading UK advisory and accountancy firm offering financial, operational, and strategic support to businesses and individuals internationally across various sectors | Accounting | 🇬🇧 London | 1,115 | 1912 |
| 21 | [PKF Global](https://www.tamtam.ai/c/pkf-global) (pkf.com)<br>Network of independent firms providing audit, accounting, tax, legal, and business advisory services across 150 countries worldwide. | Accounting | 🇬🇧 London | 877 | 1969 |
| 22 | [Nexia](https://www.tamtam.ai/c/nexia) (nexia.com)<br>Network of independent accounting and consulting firms providing audit, tax, advisory, and business services with global collaboration. | Accounting | 🇬🇧 London | 872 | 1991 |
| 23 | [Blick Rothenberg](https://www.tamtam.ai/c/blick-rothenberg) (blickrothenberg.com)<br>Leading tax, accounting and business advisory firm offering audit, accounting, business advisory, corporate and personal tax services built on integrity and expertise. | Accounting | 🇬🇧 London | 736 | 1945 |
| 24 | [Grant Thornton International Ltd](https://www.tamtam.ai/c/grant-thornton-international-ltd) (grantthornton.global)<br>Global professional services firm providing assurance, tax, and advisory services with a personal, agile, and proactive approach in over 149 countries | Accounting | 🇬🇧 London | 727 |  |
| 25 | [PKF Littlejohn](https://www.tamtam.ai/c/pkf-littlejohn) (pkf-l.com)<br>A fast-growing firm of accountants and business advisers in London, Leeds, and Manchester, offering audit, tax, and advisory services with expertise in capital markets, insurance, international businesses, and charities | Accounting | 🇬🇧 London | 715 |  |
| 26 | [HaysMac](https://www.tamtam.ai/c/haysmac) (haysmac.com)<br>Top 30 chartered accountants and tax advisors providing services to businesses, charities, and organizations, with international reach through MSI Global Alliance | Accounting | 🇬🇧 London | 702 | 2001 |
| 27 | [Kreston Reeves](https://www.tamtam.ai/c/kreston-reeves) (krestonreeves.com)<br>Providing personalized accountancy, business, and wealth advice with a focus on social responsibility, guiding clients and communities towards a brighter future | Accounting | 🇬🇧 London | 614 | 1821 |
| 28 | [UHY Hacker Young](https://www.tamtam.ai/c/uhy-hacker-young) (uhy-uk.com)<br>Award-winning UK chartered accountants with 24 offices across England, Wales, and Northern Ireland providing full service support for commercial and personal financial matters | Accounting | 🇬🇧 London | 611 | 1925 |
| 29 | [Buzzacott](https://www.tamtam.ai/c/buzzacott) (buzzacott.co.uk)<br>A top 25 UK accountancy firm based in London, providing tailored expertise for private clients, businesses, and not-for-profit organizations worldwide | Accounting | 🇬🇧 London | 591 | 1919 |
| 30 | [BKL](https://www.tamtam.ai/c/bkl) (bkl.co.uk)<br>BKL is a top firm of chartered accountants and tax advisers, known for expertise in tax matters and building relationships with ambitious clients | Accounting | 🇬🇧 London | 591 | 1980 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## More company lists in London

- [The largest companies in London](https://www.tamtam.ai/l/largest-companies-london) (12,882)
- [Multinational companies in London](https://www.tamtam.ai/l/multinational-companies-london) (3,652)
- [Financial Services companies in London](https://www.tamtam.ai/l/financial-services-companies-london) (1,862)
- [Financial services firms in London](https://www.tamtam.ai/l/financial-services-firms-london) (1,824)
- [SaaS companies in London](https://www.tamtam.ai/l/saas-companies-london) (1,615)
- [Professional services firms in London](https://www.tamtam.ai/l/professional-services-firms-london) (1,248)
- [Software Development companies in London](https://www.tamtam.ai/l/software-development-companies-london) (1,217)
- [Retail chains in London](https://www.tamtam.ai/l/retail-chains-london) (942)
- [IT Services and IT Consulting companies in London](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-london) (693)
- [Companies with a mobile app in London](https://www.tamtam.ai/l/companies-with-mobile-app-london) (667)
- [Consulting firms in London](https://www.tamtam.ai/l/consulting-firms-london) (648)
- [IT services companies in London](https://www.tamtam.ai/l/it-services-companies-london) (607)
- [Subscription businesses in London](https://www.tamtam.ai/l/subscription-businesses-london) (544)
- [Venture capital and private equity firms in London](https://www.tamtam.ai/l/vc-and-private-equity-firms-london) (539)
- [Marketing and communications agencies in London](https://www.tamtam.ai/l/marketing-agencies-london) (533)
- [Retail Apparel and Fashion companies in London](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-london) (498)
- [Advertising Services companies in London](https://www.tamtam.ai/l/advertising-services-companies-london) (480)
- [Companies with in-house R&D in London](https://www.tamtam.ai/l/r-and-d-companies-london) (477)
- [AI companies in London](https://www.tamtam.ai/l/ai-companies-london) (456)
- [Investment Management companies in London](https://www.tamtam.ai/l/investment-management-companies-london) (452)
- [Hotel and hospitality groups in London](https://www.tamtam.ai/l/hospitality-groups-london) (445)
- [Luxury brands in London](https://www.tamtam.ai/l/luxury-brands-london) (428)
- [AI-native companies in London](https://www.tamtam.ai/l/ai-native-companies-london) (407)
- [E-commerce companies in London](https://www.tamtam.ai/l/ecommerce-companies-london) (384)

## The same list elsewhere in United Kingdom

- [Accounting firms in the United Kingdom](https://www.tamtam.ai/l/accounting-firms-united-kingdom) (358)
- [Accounting firms in England](https://www.tamtam.ai/l/accounting-firms-england) (320)

## The same list elsewhere

- [Accounting firms in the world](https://www.tamtam.ai/l/accounting-firms-in-the-world) (3,737)
- [Accounting firms in Europe](https://www.tamtam.ai/l/accounting-firms-in-europe) (2,855)

---

Source: https://www.tamtam.ai/l/accounting-firms-london