Company lists · Data refreshed September 2026

Top 25 Big 5 consulting firms based in Ireland

Name: Big 5 consulting firms based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 123 companies tracked

RevenueBase identified 123 big 5 consulting firms headquartered in Ireland as of September 2026 and tracks 605 professional contacts across them, including 234 with verified work emails and 48 with mobile numbers. Dublin is the largest hub.

This list covers big 5 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 23, 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 23, 2026 86% judged on-target in blind review

123Companies

605Contacts tracked

234Verified emails

48Mobile numbers

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The 25 largest big 5 consulting firms based in Ireland

Ranked by team size

Top 25 of 123 big 5 consulting firms based in Ireland, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to big 5 consulting 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	Baker Tilly Ireland	Indirect evidence	Cork, IrelandHQ checked Sep 23, 2026	51-200	74 contacts →
	Indirect evidence “At Baker Tilly, we care about you and the impact you make.” Source: RevenueBase Database · checked Sep 23, 2026
2	Saros Consulting	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	51-200	46 contacts →
	Partial evidence “Saros Consulting is a global leader in IT consulting and strategic project management.” Source: RevenueBase Database · checked Sep 23, 2026
3	Auxilia Group	Partial evidence	Naas, IrelandHQ checked Sep 23, 2026	501-1,000	44 contacts →
	Partial evidence “Expertise Rooted in Experience Auxilia Group is one of Ireland’s foremost business consulting firms, offering multi-business function support, via our panel of over 700 high…” Source: RevenueBase Database · checked Sep 23, 2026
4	Outform Consulting L B Corp Certified	Indirect evidence	Dublin, IrelandHQ checked Sep 23, 2026	11-50	24 contacts →
	Indirect evidence “At OutForm, we work with great businesses to make them better.” Source: RevenueBase Database · checked Sep 23, 2026
5	Pinnacle Project Partners	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	11-50	20 contacts →
	Partial evidence “Pinnacle is a specialist, independent business consulting firm, experienced in the delivery of major business transformation programmes.” Source: RevenueBase Database · checked Sep 23, 2026
6	Impetus. Business Accelerated	Indirect evidence	Dublin, IrelandHQ checked Sep 23, 2026	11-50	19 contacts →
	Indirect evidence “We are a firm of international senior-level experts, each with decades of experience at some of the world's top companies.” Source: RevenueBase Database · checked Sep 23, 2026
7	Clarion Consulting	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	11-50	16 contacts →
	Partial evidence “Clarion Consulting is a leading Business and Information Technology consulting company.” Source: RevenueBase Database · checked Sep 23, 2026
8	HJKL	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	1-10	11 contacts →
	Partial evidence “Technology and People Consulting” Source: RevenueBase Database · checked Sep 23, 2026
9	Byrne Ó Cléirigh	Indirect evidence	Dublin 2, IrelandHQ checked Sep 23, 2026	11-50	10 contacts →
	Indirect evidence “Byrne Ó Cléirigh is a firm of professional engineers and management consultants.” Source: RevenueBase Database · checked Sep 23, 2026
10	Wolf And OAK	Indirect evidence	Dublin, IrelandHQ checked Sep 23, 2026	11-50	9 contacts →
	Indirect evidence “We help companies achieve their goals by identifying the gap between where they are and where they need to be, by ensuring the deployment of best-fit technologies, the first time…” Source: RevenueBase Database · checked Sep 23, 2026
11	Sterling Engineering LTD	Indirect evidence	Galway, IrelandHQ checked Sep 23, 2026	201-500	8 contacts →
	Indirect evidence “Sterling is committed to solving our client’s business challenges while helping our employees achieve their career objectives.” Source: RevenueBase Database · checked Sep 23, 2026
12	John O'callaghan LTD	Indirect evidence	Dundalk, IrelandHQ checked Sep 23, 2026	1-10	7 contacts →
	Indirect evidence “Since our establishment in 1983 we have always believed that our priority is making your business operate as efficiently as possible both from an operational and taxation…” Source: RevenueBase Database · checked Sep 23, 2026
13	Pinta Consulting	Partial evidence	Crosshaven, IrelandHQ checked Sep 23, 2026	11-50	5 contacts →
	Partial evidence “Pinta Consulting operates on a global footprint, proactively supporting our customers of all sizes from multinationals to SME’s to owner-managed.” Source: RevenueBase Database · checked Sep 23, 2026
14	Analyze	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	1-10	4 contacts →
	Partial evidence “At Analyze, we help businesses streamline operations, enhance efficiency, and scale with confidence through tailored management systems and strategic consulting.” Source: RevenueBase Database · checked Sep 23, 2026
15	Cogo Consulting	Indirect evidence	Kinsale, IrelandHQ checked Sep 23, 2026	1-10	4 contacts →
	Indirect evidence “COGO is an Irish business transformation company with global reach.” Source: RevenueBase Database · checked Sep 23, 2026
16	Lean Ireland	Partial evidence	Galway, IrelandHQ checked Sep 23, 2026	1-10	4 contacts →
	Partial evidence “Lean Ireland was founded in 2001 and in the intervening years our consulting team has enabled clients to- improve customer service - implement innovative and robust solutions to…” Source: RevenueBase Database · checked Sep 23, 2026
17	Workpillar	Indirect evidence	Sandyford, IrelandHQ checked Sep 23, 2026	201-500	4 contacts →
	Indirect evidence “Welcome to Workpillar, where innovation meets expertise to drive your business forward!” Source: RevenueBase Database · checked Sep 23, 2026
18	Odyssey Consultants	Indirect evidence	Dublin, IrelandHQ checked Sep 23, 2026	11-50	4 contacts →
	Indirect evidence “We help our clients take the next step in their journey by providing a tailored, people-centric approach to their business transformation needs.” Source: RevenueBase Database · checked Sep 23, 2026
19	Tools For Better	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	1-10	4 contacts →
	Partial evidence “Consulting with Conscience We partner with organisations to improve their outlook, helping them solve complex challenges that better the world at every level - from individual…” Source: RevenueBase Database · checked Sep 23, 2026
20	Xcellerate Caas	Indirect evidence	Dublin, IrelandHQ checked Sep 23, 2026	1-10	3 contacts →
	Indirect evidence “Accessible Excellence for All!” Source: RevenueBase Database · checked Sep 23, 2026
21	Accelerate Consulting	Partial evidence	Dublin 6, IrelandHQ checked Sep 23, 2026	1-10	3 contacts →
	Partial evidence “Accelerate Consulting focus on assisting organisations and individuals become more successful by providing valuable guidance and assistance to overcome strategic and operational…” Source: RevenueBase Database · checked Sep 23, 2026
22	Pathway4business	Indirect evidence	County Cork, IrelandHQ checked Sep 23, 2026	1-10	3 contacts →
	Indirect evidence “A Management Consultancy Company which specializes in helping hi-tech companies grow their business through Professional Service Best Practice and Solutions Selling” Source: RevenueBase Database · checked Sep 23, 2026
23	Revim Group	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	1-10	2 contacts →
	Partial evidence “We solve our clients' business problems by providing services in technology, innovation and consulting.” Source: RevenueBase Database · checked Sep 23, 2026
24	Merrion Media	Indirect evidence	Dublin, IrelandHQ checked Sep 23, 2026	1-10	2 contacts →
	Indirect evidence “We work with leaders at major companies to identify & deliver ambitious growth.” Source: RevenueBase Database · checked Sep 23, 2026
25	Neuronspring	Partial evidence	Dublin, IrelandHQ checked Sep 23, 2026	11-50	2 contacts →
	Partial evidence “NeuronSpring is a specialised consulting firm working predominantly in the ‘Fin-Tech’ arena.” Source: RevenueBase Database · checked Sep 23, 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: big 5 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 5 consulting firms.
Partial evidence: Its own public description names part of big 5 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 5 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 123 big 5 consulting firms based in Ireland

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Big 5 consulting firms based in Ireland at a glance

As of Sep 23, 2026

38.7%Verified-email coverage

7.9%Mobile-number coverage

4.9Average contacts per company

1-10Median size (employees)

39.0%Largest-city concentration · Dublin

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 25.0d

1840–30

4931–60

161–90

090–180

0180+

Company record updated

Median 68.0d

00–30

21731–60

24861–90

10490–180

36180+

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 5 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 5 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 5 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 5 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, 234 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 23, 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 5 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 5 consulting firms are there based in Ireland?

RevenueBase identified 123 big 5 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?

Baker Tilly Ireland, headquartered in Cork, tops this list with the largest team on record.

Which city has the most big 5 consulting firms?

Dublin leads with 48 headquartered companies, followed by Cork (6) and Blackrock (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 234 verified decision-maker contacts tracked across these 123 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 23, 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.