Company lists · Data refreshed September 2026

Top 25 Professional services firms based in Ireland

Name: Professional services firms based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 400 companies tracked

RevenueBase identified 400 professional services firms headquartered in Ireland as of September 2026 and tracks 9,174 professional contacts across them, including 4,870 with verified work emails and 244 with mobile numbers. Dublin is the largest hub.

This list covers professional services firms headquartered in Ireland, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

400Companies

9,174Contacts tracked

4,870Verified emails

244Mobile numbers

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The 25 largest professional services firms based in Ireland

Ranked by team size

Top 25 of 400 professional services firms based in Ireland, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names professional services firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Kpmg IrelandStrong evidence	Dublin 2, IrelandHQ checked Sep 5, 2026	1,001-5,000	2,952
	“KPMG is a leading provider of professional services, offering a range of audit, tax and advisory services to a broad range of domestic and international clients across all sectors…” Source: company website · checked Sep 5, 2026
2	Grant Thornton IrelandIndirect evidence	Dublin, IrelandHQ checked Sep 5, 2026	1,001-5,000	2,374
	“In Ireland, Grant Thornton Ireland and Grant Thornton Corporate Finance Limited (and their respective subsidiary/affiliate entities) operate under an alternative practice…” Source: company website · checked Sep 5, 2026
3	BDO IrelandIndirect evidence	Dublin, IrelandHQ checked Sep 5, 2026	201-500	521
	“BDO Ireland LLP is an accountancy and business advisory firm that provides Audit, Tax, Deals, and Consulting, Risk & Outsourcing (CR & O) services to entrepreneurial, growing and…” Source: company website · checked Sep 5, 2026
4	CrowleysdfkIndirect evidence	Dublin 2, IrelandHQ checked Sep 5, 2026	51-200	129
	“At Crowleys DFK we believe in creating value for our clients.” Source: company website · checked Sep 5, 2026
5	Eisneramper IrelandIndirect evidence	Dublin 18, IrelandHQ checked Sep 5, 2026	51-200	119
	“One brand.” Source: company website · checked Sep 5, 2026
6	OSKStrong evidence	Dublin, IrelandHQ checked Sep 5, 2026	11-50	78
	“OSK have been providing quality and professional business advice to Irish businesses since 1985.” Source: company website · checked Sep 5, 2026
7	BDO LimerickIndirect evidence	Limerick, IrelandHQ checked Sep 5, 2026	51-200	75
	“BDO is the only multi-disciplined, “relationship based” accountancy firm focusing on entrepreneurial and growing businesses in Ireland.” Source: company website · checked Sep 5, 2026
8	Baker Tilly IrelandIndirect evidence	Cork, IrelandHQ checked Sep 5, 2026	51-200	74
	“At Baker Tilly, we care about you and the impact you make.” Source: company website · checked Sep 5, 2026
9	Cronin & CompanyIndirect evidence	Terenure, IrelandHQ checked Sep 5, 2026	11-50	74
	“Cronin & Company was established in 1978 by Michael Cronin.” Source: company website · checked Sep 5, 2026
10	Strata FinancialIndirect evidence	Dublin 2, IrelandHQ checked Sep 5, 2026	51-200	74
	“Strata Financial provides a full suite of all accounting, auditing, tax, management, and compliance services.” Source: company website · checked Sep 5, 2026
11	HLB IrelandIndirect evidence	Dublin, IrelandHQ checked Sep 5, 2026	51-200	70
	“HLB Ireland provide quality accountancy services and business advice to entrepreneurial and owner managed businesses.” Source: company website · checked Sep 5, 2026
12	UHY Farrelly Dawe White LimitedIndirect evidence	Dundalk, IrelandHQ checked Sep 5, 2026	51-200	68
	“UHY FDW is a leading audit, tax and advisory practice in Ireland, driven to achieve a better future together, for our people, our clients and our communities.” Source: company website · checked Sep 5, 2026
13	CSGStrong evidence	Tralee, IrelandHQ checked Sep 5, 2026	11-50	60
	“Welcome to CSG, a leading accountancy firm in Ireland providing professional services to businesses of all sizes.” Source: company website · checked Sep 5, 2026
14	MHP SellorsIndirect evidence	Limerick, IrelandHQ checked Sep 5, 2026	11-50	52
	“MHP Sellors LLP is the largest dual-county legal team in the Mid-West region formed by merger of award winning law firms MHP Solicitors & Sellors and has the expertise and…” Source: company website · checked Sep 5, 2026
15	O'neill FoleyIndirect evidence	Kilkenny, IrelandHQ checked Sep 5, 2026	51-200	48
	“O’Neill Foley is the largest independent firm of Chartered Accountants in the South East of Ireland and we’ve been helping businesses grow since 1958.” Source: company website · checked Sep 5, 2026
16	Walsh O'brien HarnettStrong evidence	Dublin 2, IrelandHQ checked Sep 5, 2026	11-50	45
	“Based in Dublin, Walsh O’Brien Harnett is one of Ireland’s top 20 professional advisory firms offering a wide range of accounting, audit, tax, advisory and corporate services.” Source: company website · checked Sep 5, 2026
17	Noone CaseyIndirect evidence	Dublin 2, IrelandHQ checked Sep 5, 2026	11-50	42
	“Noone Casey is a Dublin based Accountancy & Advisory firm.” Source: company website · checked Sep 5, 2026
18	Gilroy Gannon Chartered AccountantsIndirect evidence	Sligo, IrelandHQ checked Sep 5, 2026	51-200	41
	“Gilroy Gannon brings to its clients a unique partnership - people drawn together from the major international accounting firms, industry and small practice with the common goal of…” Source: company website · checked Sep 5, 2026
19	Malone & COIndirect evidence	Dublin, IrelandHQ checked Sep 5, 2026	51-200	40
	“At Malone & Co, we go beyond the numbers.” Source: company website · checked Sep 5, 2026
20	MBSLIndirect evidence	Dundrum, IrelandHQ checked Sep 5, 2026	11-50	34
	“MBSL is a firm of chartered accountants specialising in outsourced accounting.” Source: company website · checked Sep 5, 2026
21	Nathan Trust B CorpIndirect evidence	Cork City, IrelandHQ checked Sep 5, 2026	11-50	31
	“At Nathan Trust, we go beyond company formation.” Source: company website · checked Sep 5, 2026
22	Dbass Accountancy & TAX AdvisoryIndirect evidence	Ashbourne, IrelandHQ checked Sep 5, 2026	11-50	30
	“DBASS are a medium sized chartered accountancy firm based in Leinster, which has been delivering a broad range of accountancy and business advisory services to our clients for…” Source: company website · checked Sep 5, 2026
23	Kieran Ryan & COIndirect evidence	Dublin 2, IrelandHQ checked Sep 5, 2026	11-50	27
	Source: company website · checked Sep 5, 2026
24	Westboro PartnersIndirect evidence	Cork, IrelandHQ checked Sep 5, 2026	11-50	27
	“Business & Financial Advisers Established in 1983, Westboro leads the market in advising entrepreneurial, growth oriented businesses.” Source: company website · checked Sep 5, 2026
25	Leonard & CompanyStrong evidence	Rathfarnham, IrelandHQ checked Sep 5, 2026	1-10	26
	“Leonard & Company of Rathfarnham, Dundrum, South Dublin, is a multidisciplinary professional services accountancy practice that is committed to providing a comprehensive range of…” Source: company website · checked Sep 5, 2026

Showing 25 of 400 professional services firms based in Ireland

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Professional services firms based in Ireland at a glance

As of Sep 5, 2026

1-10Median size (employees)

DublinLargest hub · 55 HQs

244Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

231

11-50

138

51-200

201-500

1,001-5,000

Verified emails by last verification

0–30

4,583

31–60

262

61–90

90–180

180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among professional services firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Ireland whose own description of what they do matches “professional services firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among professional services firms, and records with no verified work email. Companies headquartered outside Ireland are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 4,870 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Professional services firms by metro

Professional services firms in Dublin55

Frequently asked

How many professional services firms are there based in Ireland?

RevenueBase identified 400 professional services firms headquartered in Ireland as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Kpmg Ireland, headquartered in Dublin, tops this list with the largest team on record.

Which city has the most professional services firms?

Dublin leads with 55 headquartered companies, followed by Cork (23) and Limerick (17).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 4,870 verified decision-maker contacts tracked across these 400 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.