Company lists · Data refreshed September 2026
Top 25 Big 4 business consulting firms based in Ireland
RevenueBase identified 100 big 4 business consulting firms headquartered in Ireland as of September 2026 and tracks 7,847 professional contacts across them, including 2,702 with verified work emails. Dublin is the largest hub.
This list covers big 4 business consulting 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 21, 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.
The 25 largest big 4 business consulting firms based in Ireland
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,952 contacts → | ||||
Indirect 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 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 698 contacts → | ||||
Partial evidence “Forvis Mazars in Ireland is a leading international audit, tax, advisory and consulting firm.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 521 contacts → | ||||
Partial 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 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 129 contacts → | ||||
Indirect evidence “At Crowleys DFK we believe in creating value for our clients.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 119 contacts → | ||||
Indirect evidence “One brand.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 78 contacts → | ||||
Indirect evidence “OSK have been providing quality and professional business advice to Irish businesses since 1985.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 74 contacts → | ||||
Indirect evidence “At Baker Tilly, we care about you and the impact you make.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 66 contacts → | ||||
Indirect evidence “With an Irish heritage dating back to 1958, we’ve built a legacy in expertise, simplicity and an unrelenting commitment to client success.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 60 contacts → | ||||
Indirect evidence “Welcome to CSG, a leading accountancy firm in Ireland providing professional services to businesses of all sizes.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 45 contacts → | ||||
Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 26 contacts → | ||||
Indirect evidence “Leonard & Company of Rathfarnham, Dundrum, South Dublin, is a multidisciplinary professional services accountancy practice that is committed to providing a comprehensive range of…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 24 contacts → | ||||
Indirect evidence “At Woods and Partners, our experience is reflected in the services we offer.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 23 contacts → | ||||
Indirect 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 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 20 contacts → | ||||
Indirect evidence “Having the right accountant on your team is a critical part of your success and because there’re so much choice out there it can be tricky to find the one that fits exactly with…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 18 contacts → | ||||
Indirect evidence “Since our formation in 1984, we have developed to be a top practice located in Galway.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 17 contacts → | ||||
Indirect evidence “AMQ is a multidisciplinary firm of Accountants, Registered Auditors and Business Consultants.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 15 contacts → | ||||
Indirect evidence “Chartered accountants, auditors and tax consultants” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 14 contacts → | ||||
Indirect evidence “Hugh McCarthy & Associates is a leading professional audit and advisory firm providing professional services to a range of industries and clients including private individuals…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 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 21, 2026Thanks. The Data Team will review it. | |||||
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: big 4 business consulting 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 big 4 business consulting firms.
- Partial evidence
- Its own public description names part of big 4 business consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name big 4 business consulting 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 100 big 4 business consulting firms based in Ireland
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Big 4 business consulting firms based in Ireland at a glance
As of Sep 21, 2026Companies by employee count
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 100 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 big 4 business consulting 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 “big 4 business consulting 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 big 4 business consulting 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 big 4 business consulting 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, 2,702 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 21, 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 big 4 business consulting 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 big 4 business consulting firms are there based in Ireland?
RevenueBase identified 100 big 4 business consulting 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 big 4 business consulting firms?
Dublin leads with 15 headquartered companies, followed by Cork (4) and Limerick (4).
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 2,702 verified decision-maker contacts tracked across these 100 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 21, 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.
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