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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
ICON plciconplc.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 |
35,001 | |||
| 2 |
ICON Strategic Solutionsiconplc.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 |
7,496 | |||
| 3 | 4,748 | ||||
| 4 |
PM Grouppmgroup-global.com
Specializes in designing, constructing, and commissioning high-tech facilities for pharma, food, data centers, medical technology, manufacturing, and energy sectors globally. |
4,477 | |||
| 5 |
Version 1version1.com
IT services and solutions provider trusted by global brands, offering independent advice to navigate the evolving IT landscape and drive customer success |
3,944 | |||
| 6 |
KPMG Irelandkpmg.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 |
2,978 | |||
| 7 |
Grant Thornton Irelandgrantthornton.ie
Providing innovative financial and business solutions with local expertise and global reach, fostering client relationships and ethical practices. |
2,514 | |||
| 8 |
PwC Irelandpwc.ie
Global network providing assurance, advisory, and tax services with a commitment to quality and building trust in society. |
2,502 | |||
| 9 |
S&W Irelandswgroup.com
Providing expert tax, accountancy, assurance, and advisory services to support Irish and international businesses through growth, risks, and exits. |
2,293 | |||
| 10 |
Linesightlinesight.com
Provides professional consultancy, management support, and strategic advice to the global construction industry from concept to completion across diverse sectors worldwide. |
1,931 | |||
| 11 |
Independent Contractorcodertal.com
Codertal connects big IT companies with top-tier IT contractors, offering on-demand services, software development, recruitment assistance, and cost-effective staffing solutions |
1,410 | |||
| 12 |
Matheson LLPmatheson.com
A global legal services provider with expertise in various practice areas, serving internationally focused companies and financial institutions operating in Ireland |
1,139 | |||
| 13 |
A&L Goodbody LLPalgoodbody.com
A leading Irish corporate law firm with over 100 years of experience, serving domestic and international businesses with offices in multiple locations |
1,054 | |||
| 14 |
OSSosscompany.ie
This company offers HR expertise and recruitment solutions for the construction industry and events sector, focusing on quality, safety, and operational excellence |
951 | |||
| 15 |
Arthur Cox LLParthurcox.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 |
915 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
ICDS Groupicds.ie
Specializing in staffing solutions for Construction, Civil, Manufacturing, Engineering, Scientific, Medical, Technical, Food, IT, and Finance industries worldwide since 1976 |
858 | |||
| 17 |
Vistatecvistatec.com
A global provider of content solutions, specializing in localization, translation, digital marketing, technical documentation, multimedia, and language automation since 1997 |
796 | |||
| 18 |
Mason Hayes & Curran LLPmhc.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 |
722 | |||
| 19 |
Carne Groupcarnegroup.com
Provides a unified platform for risk, compliance, due diligence, distribution, and governance to simplify asset management operations. |
712 | |||
| 20 |
McCann FitzGerald LLPmccannfitzgerald.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 |
657 | |||
| 21 |
APCapprocess.com
This company helps biopharma companies accelerate drug development with breakthrough science, lightning-fast process development, and radical collaboration to deliver for patients faster |
648 | |||
| 22 |
Access Healthcareaccesshealthcare.ie
A healthcare staffing agency focused on understanding and serving nurses and clients, with a high fill rate for nursing shifts |
612 | |||
| 23 |
WILLIAM FRY LLPwilliamfry.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 |
576 | |||
| 24 | 569 | ||||
| 25 |
Clarity Locums Ireland - Healthcare Recruitment Specialistsclaritylocums.com
Established in 2012, we provide trusted healthcare staffing services in Ireland and the UK, offering cost-effective solutions for professionals and clients |
546 | |||
| 26 |
BDO Irelandbdo.ie
BDO Ireland offers personalized services with a human touch, providing practical solutions with intelligence, empathy, and purpose through a global network |
527 | |||
| 27 |
Perigordperigord-as.com
Global leader in end-to-end packaging supply chain solutions for the Life Science Industry, specializing in artwork, marcoms, and digital assets |
501 | |||
| 28 |
RECRUITERSrecruiters.ie
A trusted recruitment partner in Ireland, specializing in various industries such as sales, IT, finance, HR, and business operations |
464 | |||
| 29 |
CAE Parc Aviationcae.com
A global aviation services company offering flight crew, aircraft support, MRO services, and job opportunities in various roles within the industry |
428 | |||
| 30 |
ESB Internationalesbinternational.ie
A global engineering consultancy firm serving the utility sector, specializing in delivering large-scale projects to maximize investor returns and minimize project risk |
413 | |||
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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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