Company lists · Data refreshed September 2026

Top 25 Professional service firms based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 45 companies tracked

RevenueBase identified 45 professional service firms headquartered in Ireland as of September 2026 and tracks 6,423 professional contacts across them, including 3,625 with verified work emails. Cork is the largest hub.

This list covers professional service 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

45Companies

6,423Contacts tracked

3,625Verified emails

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The 25 largest professional service firms based in Ireland

Ranked by team size

Top 25 of 45 professional service firms based in Ireland, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to professional service firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Kpmg Ireland	Strong evidence	Dublin 2, IrelandHQ checked Sep 20, 2026	1,001-5,000	2,952 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 20, 2026
2	Grant Thornton Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 20, 2026	1,001-5,000	2,374 contacts →
	Indirect evidence “In Ireland, Grant Thornton Ireland and Grant Thornton Corporate Finance Limited (and their respective subsidiary/affiliate entities) operate under an alternative practice…” Source: RevenueBase Database · checked Sep 20, 2026
3	BDO Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 20, 2026	201-500	521 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 20, 2026
4	Eisneramper Ireland	Indirect evidence	Dublin 18, IrelandHQ checked Sep 20, 2026	51-200	119 contacts →
	Indirect evidence “One brand.” Source: RevenueBase Database · checked Sep 20, 2026
5	Baker Tilly Ireland	Indirect evidence	Cork, IrelandHQ checked Sep 20, 2026	51-200	74 contacts →
	Indirect evidence “At Baker Tilly, we care about you and the impact you make.” Source: RevenueBase Database · checked Sep 20, 2026
6	UHY Farrelly Dawe White Limited	Indirect evidence	Dundalk, IrelandHQ checked Sep 20, 2026	51-200	68 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 20, 2026
7	Gilroy Gannon Chartered Accountants	Indirect evidence	Sligo, IrelandHQ checked Sep 20, 2026	51-200	41 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 20, 2026
8	BCA TAX & Business Consultants	Indirect evidence	Tullamore, IrelandHQ checked Sep 20, 2026	11-50	25 contacts →
	Indirect evidence “BCA provide a full range of proactive financial, taxation, business advisory, audit, company secretarial and commercial services to our broad range of clients.” Source: RevenueBase Database · checked Sep 20, 2026
9	HDS	Strong evidence	Limerick, IrelandHQ checked Sep 20, 2026	11-50	23 contacts →
	Strong evidence “HDS, founded in 2004, is an established practice of professional advisors with offices at RiverPoint, one of Limerick’s most recognisable and prestigious landmark buildings.” Source: RevenueBase Database · checked Sep 20, 2026
10	Stephens Cooke & Associates	Indirect evidence	Mullingar, IrelandHQ checked Sep 20, 2026	11-50	15 contacts →
	Indirect evidence “At Stephens Cooke & Associates we are committed to providing a comprehensive range of services to ensure that we are not simply a service provider, but a firm that work in…” Source: RevenueBase Database · checked Sep 20, 2026
11	Lewis & CO Chartered Accountants	Indirect evidence	Blackrock, IrelandHQ checked Sep 20, 2026	1-10	15 contacts →
	Indirect evidence “Chartered accountants, auditors and tax consultants” Source: RevenueBase Database · checked Sep 20, 2026
12	O'gorman Brannigan Purtill & CO	Indirect evidence	Clonmel, IrelandHQ checked Sep 20, 2026	11-50	14 contacts →
	Indirect evidence “At OGBP we aim to understand our clients’ business`s and work with them in achieving their goals.” Source: RevenueBase Database · checked Sep 20, 2026
13	Mcmahon Auditors Accountants	Indirect evidence	Kildare Town, IrelandHQ checked Sep 20, 2026	11-50	13 contacts →
	Indirect evidence “McMahon Auditors Accountants is a well-established firm of accountants, tax advisors, and business consultants, proudly serving clients from our offices in Kildare, Naas, and…” Source: RevenueBase Database · checked Sep 20, 2026
14	Visio Advisory	Indirect evidence	Sutton, IrelandHQ checked Sep 20, 2026	11-50	11 contacts →
	Indirect evidence “We focus on building strong relationships with our personal and business clients by getting to know them, their plans and their aspirations.” Source: RevenueBase Database · checked Sep 20, 2026
15	Fintech PRO	Indirect evidence	Dublin, IrelandHQ checked Sep 20, 2026	1-10	8 contacts →
	Indirect evidence “Qualified Accountants, Business Advisors, and Management Consultants enabling Businesses Grow by helping them with Accounting and Tax compliance needs.” Source: RevenueBase Database · checked Sep 20, 2026
16	Fitzgerald Legal & Advisory LLP	Strong evidence	Cork, IrelandHQ checked Sep 20, 2026	11-50	7 contacts →
	Strong evidence “At FitzGerald Legal & Advisory you get both specialised legal and advisory knowledge and full service representation as FitzGerald Legal & Advisory is a professional firm with…” Source: RevenueBase Database · checked Sep 20, 2026
17	Corvidae Accounting	Strong evidence	Dublin, IrelandHQ checked Sep 20, 2026	11-50	7 contacts →
	Strong evidence “Welcome to Corvidae We are the only professional services firm where you can access high quality Accounting, Tax, and HR services all in one place.” Source: RevenueBase Database · checked Sep 20, 2026
18	J. Meade & Company	Indirect evidence	Dublin 5, IrelandHQ checked Sep 20, 2026	11-50	6 contacts →
	Indirect evidence “J.” Source: RevenueBase Database · checked Sep 20, 2026
19	Patrick Mcnamara & Associates	Indirect evidence	Cork, IrelandHQ checked Sep 20, 2026	1-10	5 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
20	Murray Cloney & Associates Limited	Indirect evidence	Co Cork, IrelandHQ checked Sep 20, 2026	1-10	4 contacts →
	Indirect evidence “Accountants for small, medium and large businesses Tax Consultants and tax planning advice Business consultants for existing and start up businesses Farming tax and accounts…” Source: RevenueBase Database · checked Sep 20, 2026
21	Ormsby & Rhodes	Indirect evidence	IrelandHQ checked Sep 20, 2026	11-50	3 contacts →
	Indirect evidence “Chartered Accountants, Registered Auditors and Business Advisors Ormsby and Rhodes is one of the longest established Accounting Firms in Ireland.” Source: RevenueBase Database · checked Sep 20, 2026
22	Paye Anytime Ltd. T A Michael O Leary And Company	Indirect evidence	Wexford Town, IrelandHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “Michael O’Leary & company was founded in Wexford in 1980.” Source: RevenueBase Database · checked Sep 20, 2026
23	AAL	Strong evidence	Clonmel, IrelandHQ checked Sep 20, 2026	1-10	3 contacts →
	Strong evidence “AAL are an innovative and professional practice that provide Advisory, Accountancy & Tax, Management Information Systems, and Organisation and Leadership Services.” Source: RevenueBase Database · checked Sep 20, 2026
24	O'dwyer & Co. Accountants, Auditors & TAX Advisors	Indirect evidence	Co Waterford, IrelandHQ checked Sep 20, 2026	1-10	2 contacts →
	Indirect evidence “O'Dwyer & Co.” Source: RevenueBase Database · checked Sep 20, 2026
25	Dwyer Accountants	Indirect evidence	Cork, IrelandHQ checked Sep 20, 2026	11-50	1 contacts →
	Indirect evidence “We understand that knowledge is everything and we help clients benefit from it by applying knowledge and expertise from relevant disciplines within the firm and tailoring it to…” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: professional service firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names professional service firms.
Partial evidence: Its own public description names part of professional service firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name professional service firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 45 professional service firms based in Ireland

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Professional service firms based in Ireland at a glance

As of Sep 20, 2026

56.4%Verified-email coverage

142.7Average contacts per company

11-50Median size (employees)

11.1%Largest-city concentration · Cork

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured worldwide rather than for Ireland, so it is reported there. Company counts and contact totals on this page are exact for Ireland, over 45 companies.

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 service firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, 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 service firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names professional service firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among professional service 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 its RevenueBase Smart Search 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, 3,625 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 20, 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.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names professional service firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many professional service firms are there based in Ireland?

RevenueBase identified 45 professional service 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 service firms?

Cork leads with 5 headquartered companies, followed by Dublin (5) and Clonmel (1).

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 3,625 verified decision-maker contacts tracked across these 45 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 20, 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 Smart Search, 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.