# The 30 largest recruitment and staffing agencies in London

Tamtam tracks 347 recruitment and staffing agencies headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by WTW, Hays and AMS. Their median headcount is 4,046. Half of them were founded in 1994 or later.

These London-based companies are primarily large-scale recruitment and staffing agencies, alongside significant players in HR services, business consulting, and IT consulting. They often focus on specialized sectors such as STEM, healthcare, and education. Noteworthy examples include Hays, a global specialist in recruitment and workforce solutions, AMS, which focuses on digital innovation in talent solutions, and Reed, a long-standing family-run recruitment agency.

A clear pattern among these companies is their strong presence in professional services, with many offering comprehensive solutions beyond traditional recruitment, such as advisory, outsourcing, and technology solutions. Most of these larger firms are headquartered in London, indicating the city's role as a central hub for these extensive service providers.

🇬🇧 London · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [WTW](https://www.tamtam.ai/c/wtw) (wtwco.com)<br>Offering data-driven solutions in people, risk, and capital areas, leveraging global expertise to enhance strategy, resilience, workforce motivation, and performance | Financial Services | 🇬🇧 London | 55,656 |  |
| 2 | [Hays](https://www.tamtam.ai/c/hays) (haysplc.com)<br>Specialist recruitment and workforce solutions provider offering advisory services, career transitions, and employer brand positioning, with a focus on empowering people and businesses to succeed globally | Staffing and Recruiting | 🇬🇧 London | 31,854 |  |
| 3 | [AMS](https://www.tamtam.ai/c/ams) (weareams.com)<br>Global talent solutions business specializing in sourcing, selecting, and retaining top talent through digital innovation, HR expertise, and a holistic approach to workforce management | Human Resources Services | 🇬🇧 London | 8,718 | 1996 |
| 4 | [Supporting Education Group](https://www.tamtam.ai/c/supporting-education-group) (supportingeducation.com)<br>Providing qualified teachers, support staff, professional development, and tailored services to improve education quality for schools and disadvantaged students. | Education | 🇬🇧 London | 8,571 |  |
| 5 | [SThree](https://www.tamtam.ai/c/sthree) (sthree.com)<br>Connecting skilled STEM professionals with organizations to drive innovation and solve complex challenges through specialist brands and tailored workforce solutions. | Business Consulting and Services | 🇬🇧 London | 7,927 |  |
| 6 | [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 |  |
| 7 | [Reed](https://www.tamtam.ai/c/reed) (reed.com)<br>A leading family-run recruitment agency since 1960, offering specialist services and the UK's largest candidate database to fill various job positions | Staffing and Recruiting | 🇬🇧 London | 6,669 | 1960 |
| 8 | [Acacium Group](https://www.tamtam.ai/c/acacium-group) (linktr.ee)<br>Global healthcare delivery partner with 40+ years experience offering workforce access, technology, and expertise to improve healthcare, social care, and life sciences worldwide | Hospitals and Health Care | 🇬🇧 London | 5,961 |  |
| 9 | [V.Group](https://www.tamtam.ai/c/v-group) (vgrouplimited.com)<br>A dedicated partner advancing maritime activities and innovations | Maritime Transportation | 🇬🇧 London | 5,889 | 1984 |
| 10 | [Vialto](https://www.tamtam.ai/c/vialto) (vialtopartners.com)<br>Global mobility ecosystem transformation through tax, immigration, compensation, and work strategy solutions for multinational organizations in 150+ countries | Business Consulting and Services | 🇬🇧 London | 5,717 |  |
| 11 | [Computer Futures](https://www.tamtam.ai/c/computer-futures) (computerfutures.com)<br>A global STEM recruitment company connecting businesses with highly skilled IT talent for over 30 years through specialized IT market expertise | IT Services and IT Consulting | 🇬🇧 London | 5,349 | 1986 |
| 12 | [RSS Global](https://www.tamtam.ai/c/rss-global) (rssglobal.com)<br>A portfolio of staffing brands specializing in workforce solutions across various sectors in the UK, Ireland, and Asia Pacific | Staffing and Recruiting | 🇬🇧 London | 4,535 |  |
| 13 | [Robert Walters](https://www.tamtam.ai/c/robert-walters) (robertwalters.co.uk)<br>Providing recruitment, outsourcing, and advisory services globally to connect organizations with skilled professionals for permanent, temporary, or interim roles. | Staffing and Recruiting | 🇬🇧 London | 4,508 | 1985 |
| 14 | [FDM Group](https://www.tamtam.ai/c/fdm-group) (fdmgroup.com)<br>global business and technology consultancy powering tech innovation, launching careers, partnering with companies, emphasizing diversity and inclusivity worldwide | IT Services and IT Consulting | 🇬🇧 London | 4,132 | 1991 |
| 15 | [UNKNOWN](https://www.tamtam.ai/c/unknown-london) (weareunknown.io)<br>The company fosters diversity and creativity by facilitating connections, welcoming different perspectives to open up new possibilities in creative communities | Staffing and Recruiting | 🇬🇧 London | 4,046 | 2018 |
| 16 | [Blue Arrow](https://www.tamtam.ai/c/blue-arrow) (bluearrow.co.uk)<br>A leading UK staffing agency with expertise in placing candidates in various sectors, known for excellence in recruitment and employer recognition | Staffing and Recruiting | 🇬🇧 London | 3,506 | 1959 |
| 17 | [QX Global Group](https://www.tamtam.ai/c/qx-global-group) (qxglobalgroup.com)<br>Partnering with mid-market organizations to reduce operating costs, improve efficiency, and scale confidently through sector expertise, process optimization, and technology. | Outsourcing and Offshoring Consulting | 🇬🇧 London | 3,089 | 2003 |
| 18 | [London](https://www.tamtam.ai/c/london) (agency.org.uk)<br>Innovative recruitment agency based in London helps individuals find and apply for the latest job opportunities to start new careers | Executive Offices | 🇬🇧 London | 2,884 |  |
| 19 | [NGA Human Resources, an Alight company](https://www.tamtam.ai/c/nga-human-resources-an-alight-company) (alight.com)<br>Global provider of HR solutions, pioneering digital HR, payroll, compliance, and workforce data to enhance employee experiences, save costs, and transform organizations worldwide | Human Resources Services | 🇬🇧 London | 2,789 |  |
| 20 | [Ingeus](https://www.tamtam.ai/c/ingeus) (ingeus.co.uk)<br>This organization provides services to improve skills, employment, wellbeing, and social inclusion, including employment programs, youth services, training support, and probation services | Government Administration | 🇬🇧 London | 2,546 | 2002 |
| 21 | [The Black Apprentice Network (BAN)](https://www.tamtam.ai/c/the-black-apprentice-network-ban) (blackapprenticenetwork.co.uk)<br>A network for black apprentices of African and Caribbean descent to connect, learn, and grow together, striving for continuous improvement | Staffing and Recruiting | 🇬🇧 London | 2,529 | 2022 |
| 22 | [Antal International](https://www.tamtam.ai/c/antal-international) (antal.com)<br>Global executive search firm with extensive network, industry expertise, and local consultants providing talent solutions across multiple sectors worldwide. | Staffing and Recruiting | 🇬🇧 London | 2,242 | 1993 |
| 23 | [Aptia Group](https://www.tamtam.ai/c/aptia-group) (aptia-group.com)<br>Professional services firm combining technology and expertise to simplify pensions, health, and insurance management for businesses and individuals globally. | Professional Services | 🇬🇧 London | 2,209 | 2023 |
| 24 | [Tenth Revolution Group](https://www.tamtam.ai/c/tenth-revolution-group) (tenthrevolution.com)<br>Global leader bridging the tech skills gap by finding, training, and deploying talent through unified tech talent solutions for digital transformation success | Staffing and Recruiting | 🇬🇧 London | 2,179 |  |
| 25 | [Zen Educate](https://www.tamtam.ai/c/zen-educate) (zeneducate.com)<br>This company is revolutionizing education recruitment by saving schools money on agency fees, providing skilled staff, and offering a user-friendly online platform | Education Administration Programs | 🇬🇧 London | 2,147 | 2017 |
| 26 | [Shaw Trust](https://www.tamtam.ai/c/shaw-trust) (shawtrust.org.uk)<br>A social purpose organization focused on challenging inequality, providing employment opportunities, and supporting social mobility through various services and support | Non-profit Organizations | 🇬🇧 London | 2,124 | 1982 |
| 27 | [Bright Network](https://www.tamtam.ai/c/bright-network) (employers.brightnetwork.co.uk)<br>Connects top companies with bright graduates using data and technology to offer career opportunities and fulfill business talent needs. | Staffing and Recruiting | 🇬🇧 London | 2,100 | 2013 |
| 28 | [PageGroup](https://www.tamtam.ai/c/pagegroup) (page.com)<br>A global recruitment organization with a personal touch, offering specialist services to connect candidates with opportunities and help change lives | Staffing and Recruiting | 🇬🇧 London | 2,095 | 1976 |
| 29 | [GCS](https://www.tamtam.ai/c/gcs-london) (gcstechtalent.com)<br>Global recruitment agency specializing in technology and commercial sectors, connecting innovators with businesses worldwide for over 30 years Part of nGAGE Specialist Recruitment since 2017 | Staffing and Recruiting | 🇬🇧 London | 1,939 |  |
| 30 | [Protocol Education](https://www.tamtam.ai/c/protocol-education) (protocol-education.com)<br>Specialist recruitment provider for the education sector, offering placement services for teachers, assistants, nursery nurses, instructors, and tutors across England | Staffing and Recruiting | 🇬🇧 London | 1,819 | 1994 |

## 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 11, 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)
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- [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

- [Recruitment and staffing agencies in the United Kingdom](https://www.tamtam.ai/l/recruitment-agencies-united-kingdom) (778)
- [Recruitment and staffing agencies in Scotland](https://www.tamtam.ai/l/recruitment-agencies-scotland) (25)
- [Recruitment and staffing agencies in Manchester](https://www.tamtam.ai/l/recruitment-agencies-manchester) (28)

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Source: https://www.tamtam.ai/l/recruitment-agencies-london