# 30 leading professional services firms in Dublin
Tamtam tracks 75 professional services firms headquartered in Dublin. This list ranks the 30 largest by number of employees on LinkedIn, led by ICON plc, ICON Strategic Solutions and Cpl. Their median headcount is 915. Half of them were founded in 1976 or later.
These Dublin-based professional services firms are primarily large and mid-sized companies, with a strong presence in IT services, consulting, and legal practices. Notable examples include ICON plc, a global company specializing in accelerating drug development, Cpl, a global provider of talent solutions, Version 1, an IT services and solutions provider, and Matheson LLP, a global legal services provider. The list also features major accounting firms like KPMG Ireland and PwC Ireland, alongside engineering and construction consultancies such as PM Group and Linesight.
A clear pattern among these companies is their focus on serving both domestic and international clients, often with global operations or specialized expertise that transcends national borders. Many of these firms, like ICON plc and PM Group, operate in high-tech and regulated sectors, including biotechnology, pharmaceuticals, and data centers, indicating a strong support ecosystem for advanced industries in Dublin.
๐ฎ๐ช Dublin ยท 30 companies ยท Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [ICON plc](https://www.tamtam.ai/c/icon-plc) (iconplc.com)
A global company founded in Ireland in 1990, specializing in accelerating the development of drugs and devices to save lives and improve quality of life | Biotechnology Research | ๐ฎ๐ช Dublin | 35,001 | |
| 2 | [ICON Strategic Solutions](https://www.tamtam.ai/c/icon-strategic-solutions) (iconplc.com)
Global leader in Functional Service Provision services, offering cost-saving FSP models and clinical expertise to improve business performance Providing industry insights and job opportunities | Pharmaceutical Manufacturing | ๐ฎ๐ช Dublin | 7,496 | |
| 3 | [Cpl](https://www.tamtam.ai/c/cpl) (cpl.com)
Global provider of talent solutions across sectors, with 14,000 employees in 14 countries, specializing in matching the right talent to organizations | Staffing and Recruiting | ๐ฎ๐ช Dublin | 4,748 | |
| 4 | [PM Group](https://www.tamtam.ai/c/pm-group) (pmgroup-global.com)
Specializes in designing, constructing, and commissioning high-tech facilities for pharma, food, data centers, medical technology, manufacturing, and energy sectors globally. | Business Consulting and Services | ๐ฎ๐ช Dublin | 4,477 | 1973 |
| 5 | [Version 1](https://www.tamtam.ai/c/version-1) (version1.com)
IT services and solutions provider trusted by global brands, offering independent advice to navigate the evolving IT landscape and drive customer success | IT Services and IT Consulting | ๐ฎ๐ช Dublin | 3,944 | 1996 |
| 6 | [KPMG Ireland](https://www.tamtam.ai/c/kpmg-ireland) (kpmg.ie)
A leading provider of audit, tax, and advisory services for domestic and international clients across all sectors, specializing in driving value and navigating change | Accounting | ๐ฎ๐ช Dublin | 2,978 | |
| 7 | [Grant Thornton Ireland](https://www.tamtam.ai/c/grant-thornton-ireland) (grantthornton.ie)
Providing innovative financial and business solutions with local expertise and global reach, fostering client relationships and ethical practices. | Professional Services | ๐ฎ๐ช Dublin | 2,514 | |
| 8 | [PwC Ireland](https://www.tamtam.ai/c/pwc-ireland) (pwc.ie)
Global network providing assurance, advisory, and tax services with a commitment to quality and building trust in society. | Professional Services | ๐ฎ๐ช Dublin | 2,502 | |
| 9 | [S&W Ireland](https://www.tamtam.ai/c/s-and-w-ireland) (swgroup.com)
Providing expert tax, accountancy, assurance, and advisory services to support Irish and international businesses through growth, risks, and exits. | Professional Services | ๐ฎ๐ช Dublin | 2,293 | 1958 |
| 10 | [Linesight](https://www.tamtam.ai/c/linesight) (linesight.com)
Provides professional consultancy, management support, and strategic advice to the global construction industry from concept to completion across diverse sectors worldwide. | Construction | ๐ฎ๐ช Dublin | 1,931 | 1974 |
| 11 | [Independent Contractor](https://www.tamtam.ai/c/independent-contractor-dublin) (codertal.com)
Codertal connects big IT companies with top-tier IT contractors, offering on-demand services, software development, recruitment assistance, and cost-effective staffing solutions | IT Services and IT Consulting | ๐ฎ๐ช Dublin | 1,410 | |
| 12 | [Matheson LLP](https://www.tamtam.ai/c/matheson-llp) (matheson.com)
A global legal services provider with expertise in various practice areas, serving internationally focused companies and financial institutions operating in Ireland | Law Practice | ๐ฎ๐ช Dublin | 1,139 | 1825 |
| 13 | [A&L Goodbody LLP](https://www.tamtam.ai/c/a-and-l-goodbody-llp) (algoodbody.com)
A leading Irish corporate law firm with over 100 years of experience, serving domestic and international businesses with offices in multiple locations | Law Practice | ๐ฎ๐ช Dublin | 1,054 | 1901 |
| 14 | [OSS](https://www.tamtam.ai/c/oss) (osscompany.ie)
This company offers HR expertise and recruitment solutions for the construction industry and events sector, focusing on quality, safety, and operational excellence | Staffing and Recruiting | ๐ฎ๐ช Dublin | 951 | 2009 |
| 15 | [Arthur Cox LLP](https://www.tamtam.ai/c/arthur-cox-llp) (arthurcox.com)
Leading law firm in Ireland and beyond, offering comprehensive corporate and business law services to international clients with over 100 years of progressive experience | Law Practice | ๐ฎ๐ช Dublin | 915 | 1920 |
| 16 | [ICDS Group](https://www.tamtam.ai/c/icds-group) (icds.ie)
Specializing in staffing solutions for Construction, Civil, Manufacturing, Engineering, Scientific, Medical, Technical, Food, IT, and Finance industries worldwide since 1976 | Staffing and Recruiting | ๐ฎ๐ช Dublin | 858 | 1976 |
| 17 | [Vistatec](https://www.tamtam.ai/c/vistatec) (vistatec.com)
A global provider of content solutions, specializing in localization, translation, digital marketing, technical documentation, multimedia, and language automation since 1997 | Translation and Localization | ๐ฎ๐ช Dublin | 796 | 1997 |
| 18 | [Mason Hayes & Curran LLP](https://www.tamtam.ai/c/mason-hayes-and-curran-llp) (mhc.ie)
Leading law firm in Dublin, with global reach, specializing in energy, technology, finance, construction, and healthcare sectors, offering progressive career opportunities and commitment to social responsibility | Law Practice | ๐ฎ๐ช Dublin | 722 | 1970 |
| 19 | [Carne Group](https://www.tamtam.ai/c/carne-group) (carnegroup.com)
Provides a unified platform for risk, compliance, due diligence, distribution, and governance to simplify asset management operations. | Financial Services | ๐ฎ๐ช Dublin | 712 | 2004 |
| 20 | [McCann FitzGerald LLP](https://www.tamtam.ai/c/mccann-fitzgerald-llp) (mccannfitzgerald.com)
A leading law firm in Ireland with 400 lawyers, offering full services to corporate clients, financial institutions, and international organizations with offices in Dublin, London, New York, and Brussels | Law Practice | ๐ฎ๐ช Dublin | 657 | |
| 21 | [APC](https://www.tamtam.ai/c/apc-dublin) (approcess.com)
This company helps biopharma companies accelerate drug development with breakthrough science, lightning-fast process development, and radical collaboration to deliver for patients faster | Pharmaceutical Manufacturing | ๐ฎ๐ช Dublin | 648 | 2011 |
| 22 | [Access Healthcare](https://www.tamtam.ai/c/access-healthcare) (accesshealthcare.ie)
A healthcare staffing agency focused on understanding and serving nurses and clients, with a high fill rate for nursing shifts | Staffing and Recruiting | ๐ฎ๐ช Dublin | 612 | 2017 |
| 23 | [WILLIAM FRY LLP](https://www.tamtam.ai/c/william-fry-llp) (williamfry.com)
A leading Irish law firm with extensive legal and tax expertise, serving domestic and international clients with a focus on achieving results through personalized service and practical solutions | Law Practice | ๐ฎ๐ช Dublin | 576 | |
| 24 | [KSN](https://www.tamtam.ai/c/ksn) (ksn.ie)
An Irish-owned consultancy practice offering expert quantity surveying, cost management, and sustainability advice to maximize potential return for clients | Construction | ๐ฎ๐ช Dublin | 569 | 1989 |
| 25 | [Clarity Locums Ireland - Healthcare Recruitment Specialists](https://www.tamtam.ai/c/clarity-locums-ireland-healthcare-recruitment-specialists) (claritylocums.com)
Established in 2012, we provide trusted healthcare staffing services in Ireland and the UK, offering cost-effective solutions for professionals and clients | Staffing and Recruiting | ๐ฎ๐ช Dublin | 546 | 2011 |
| 26 | [BDO Ireland](https://www.tamtam.ai/c/bdo-ireland) (bdo.ie)
BDO Ireland offers personalized services with a human touch, providing practical solutions with intelligence, empathy, and purpose through a global network | Accounting | ๐ฎ๐ช Dublin | 527 | 1982 |
| 27 | [Perigord](https://www.tamtam.ai/c/perigord) (perigord-as.com)
Global leader in end-to-end packaging supply chain solutions for the Life Science Industry, specializing in artwork, marcoms, and digital assets | Pharmaceutical Manufacturing | ๐ฎ๐ช Dublin | 501 | 1976 |
| 28 | [RECRUITERS](https://www.tamtam.ai/c/recruiters) (recruiters.ie)
A trusted recruitment partner in Ireland, specializing in various industries such as sales, IT, finance, HR, and business operations | Staffing and Recruiting | ๐ฎ๐ช Dublin | 464 | 2006 |
| 29 | [CAE Parc Aviation](https://www.tamtam.ai/c/cae-parc-aviation) (cae.com)
A global aviation services company offering flight crew, aircraft support, MRO services, and job opportunities in various roles within the industry | Airlines and Aviation | ๐ฎ๐ช Dublin | 428 | 1975 |
| 30 | [ESB International](https://www.tamtam.ai/c/esb-international) (esbinternational.ie)
A global engineering consultancy firm serving the utility sector, specializing in delivering large-scale projects to maximize investor returns and minimize project risk | Utilities | ๐ฎ๐ช Dublin | 413 | 1975 |
## 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.
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- [Retail companies in Dublin](https://www.tamtam.ai/l/retail-companies-dublin) (39)
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- [Construction companies in Dublin](https://www.tamtam.ai/l/construction-companies-dublin) (27)
- [Hospitals and Health Care companies in Dublin](https://www.tamtam.ai/l/hospitals-and-health-care-companies-dublin) (27)
- [Publicly traded companies in Dublin](https://www.tamtam.ai/l/publicly-traded-companies-dublin) (27)
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## The same list elsewhere in Ireland
- [Professional services firms in Ireland](https://www.tamtam.ai/l/professional-services-firms-ireland) (126)
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Source: https://www.tamtam.ai/l/professional-services-firms-dublin