Company lists · Data refreshed September 2026

Top 25 Big 5 consulting firms based in Australia

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

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 1,629 companies tracked

RevenueBase identified 1,629 big 5 consulting firms headquartered in Australia as of September 2026 and tracks 14,081 professional contacts across them, including 6,671 with verified work emails and 1,039 with mobile numbers. Sydney is the largest hub.

This list covers big 5 consulting firms headquartered in Australia, 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

1,629Companies

14,081Contacts tracked

6,671Verified emails

1,039Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest big 5 consulting firms based in Australia

Ranked by team size

Top 25 of 1,629 big 5 consulting firms based in Australia, 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	Atturra	Indirect evidence	Sydney, AustraliaHQ checked Sep 23, 2026	1,001-5,000	801 contacts →
	Indirect evidence “Atturra (ASX: ATA) is one of Australia's leading advisory and IT solutions providers, focused on providing end-to-end transformation services to its clients.” Source: RevenueBase Database · checked Sep 23, 2026
2	Nous Group	Indirect evidence	Docklands, AustraliaHQ checked Sep 23, 2026	501-1,000	706 contacts →
	Indirect evidence “Nous Group is an international management consultancy working with clients across Australasia, the United Kingdom and North America.” Source: RevenueBase Database · checked Sep 23, 2026
3	Logistics Executive Group	Indirect evidence	Sydney, AustraliaHQ checked Sep 23, 2026	n/a	647 contacts →
	Indirect evidence “Welcome to Logistics Executive Group - The hub of your global supply chain.” Source: RevenueBase Database · checked Sep 23, 2026
4	Kordamentha	Indirect evidence	Melbourne, AustraliaHQ checked Sep 23, 2026	501-1,000	601 contacts →
	Indirect evidence “KordaMentha is a proudly independent, founder owned and led advisory firm with a reputation for getting the job done.” Source: RevenueBase Database · checked Sep 23, 2026
5	Synergy Group	Indirect evidence	Canberra, AustraliaHQ checked Sep 23, 2026	201-500	425 contacts →
	Indirect evidence “Challengers at heart, we are pragmatic explorers seeking to uncover what could be, so it can be.” Source: RevenueBase Database · checked Sep 23, 2026
6	Davidson	Indirect evidence	Brisbane City, AustraliaHQ checked Sep 23, 2026	501-1,000	305 contacts →
	Indirect evidence “As a proudly Australian company, over 30 years Davidson has evolved into a leader in enhancing workplace performance.” Source: RevenueBase Database · checked Sep 23, 2026
7	Johnstaff	Partial evidence	Melbourne, AustraliaHQ checked Sep 23, 2026	201-500	265 contacts →
	Partial evidence “Johnstaff is an independent Australian and New Zealand-owned consulting practice that specialises in client-side Advisory and Project Management services for the planning and…” Source: RevenueBase Database · checked Sep 23, 2026
8	Finity	Indirect evidence	The Rocks, AustraliaHQ checked Sep 23, 2026	201-500	253 contacts →
	Indirect evidence “We are a trusted partner of tech start-ups through to large scale organisations.” Source: RevenueBase Database · checked Sep 23, 2026
9	Terra Firma Business Consulting	Indirect evidence	Melbourne, AustraliaHQ checked Sep 23, 2026	201-500	235 contacts →
	Indirect evidence “At Terra Firma, we understand that success is all about sustaining long-term relationships.” Source: RevenueBase Database · checked Sep 23, 2026
10	Professional Advantage	Indirect evidence	124 Walker Street, AustraliaHQ checked Sep 23, 2026	201-500	234 contacts →
	Indirect evidence “Helping organisations achieve more with technology.” Source: RevenueBase Database · checked Sep 23, 2026
11	Protiviti Australia	Partial evidence	Melbourne, AustraliaHQ checked Sep 23, 2026	5,001-10,000	172 contacts →
	Partial evidence “Protiviti is a global business consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently…” Source: RevenueBase Database · checked Sep 23, 2026
12	Programmed Professionals	Indirect evidence	Melbourne, AustraliaHQ checked Sep 23, 2026	51-200	172 contacts →
	Indirect evidence “At Programmed Professionals, we are committed to delivering outstanding results for you.” Source: RevenueBase Database · checked Sep 23, 2026
13	CPT Global	Indirect evidence	Melbourne, AustraliaHQ checked Sep 23, 2026	51-200	154 contacts →
	Indirect evidence “CPT Global is your independent partner for achieving peak IT performance.” Source: RevenueBase Database · checked Sep 23, 2026
14	Providence Consulting	Partial evidence	Barton, AustraliaHQ checked Sep 23, 2026	51-200	125 contacts →
	Partial evidence “Providence Consulting is an Australian, veteran-initiated professional services firm, established in Canberra in 2005.” Source: RevenueBase Database · checked Sep 23, 2026
15	Callida	Partial evidence	Forrest, AustraliaHQ checked Sep 23, 2026	51-200	124 contacts →
	Partial evidence “Callida Consulting are a Canberra-based consulting firm, dedicated to our people and the provision of professional services across a range of service offerings.” Source: RevenueBase Database · checked Sep 23, 2026
16	Bendelta	Indirect evidence	Sydney, AustraliaHQ checked Sep 23, 2026	51-200	114 contacts →
	Indirect evidence “Bendelta is Australia’s most awarded leadership and organisational design management consultancy - transforming individuals, teams and organisations to unlock human potential and…” Source: RevenueBase Database · checked Sep 23, 2026
17	Projects Assured	Partial evidence	Braddon, AustraliaHQ checked Sep 23, 2026	51-200	110 contacts →
	Partial evidence “As a specialist management consulting firm, we pride ourselves on being your trusted strategic advisors and proven delivery partners, and we are renowned for solving our public…” Source: RevenueBase Database · checked Sep 23, 2026
18	Avocado Consulting	Indirect evidence	Sydney, AustraliaHQ checked Sep 23, 2026	51-200	108 contacts →
	Indirect evidence “We are a proud Member of the Global Technology Industry Association -GITA OUR SERVICES Avocado helps clients deliver with certainty on their complex IT change, with technology…” Source: RevenueBase Database · checked Sep 23, 2026
19	GLASS	Indirect evidence	Brisbane, AustraliaHQ checked Sep 23, 2026	51-200	106 contacts →
	Indirect evidence “What if the role of an organisation was solely for the purpose of helping you change what you did so that you didn't get what you already had?” Source: RevenueBase Database · checked Sep 23, 2026
20	Sensei	Indirect evidence	Melbourne, AustraliaHQ checked Sep 23, 2026	51-200	96 contacts →
	Indirect evidence “At Sensei we partner with you to help improve the way you work.” Source: RevenueBase Database · checked Sep 23, 2026
21	Xenco Services	Indirect evidence	Brisbane City, AustraliaHQ checked Sep 23, 2026	51-200	85 contacts →
	Indirect evidence “Founded in 2018, Xenco is a multi-disciplined, specialist service group that delivers executive and operational level support to businesses seeking significant improvements in…” Source: RevenueBase Database · checked Sep 23, 2026
22	Ey-Parthenon Strategy	Partial evidence	Sydney, AustraliaHQ checked Sep 23, 2026	51-200	84 contacts →
	Partial evidence “EY-Parthenon Strategy, formerly EY Port Jackson Partners, is a leading Australian strategy consulting practice trusted by CEOs, Boards and senior leaders to advise on the most…” Source: RevenueBase Database · checked Sep 23, 2026
23	Visagio Australia	Indirect evidence	Perth, AustraliaHQ checked Sep 23, 2026	51-200	81 contacts →
	Indirect evidence “Founded in 2003, Visagio is a global platform that helps organisations achieve their goals.” Source: RevenueBase Database · checked Sep 23, 2026
24	Parbery	Indirect evidence	Fyshwick, AustraliaHQ checked Sep 23, 2026	51-200	76 contacts →
	Indirect evidence “Parbery is a values-driven professional advisory firm and an Australian-owned SME, with a presence in ACT, QLD, SA and VIC.” Source: RevenueBase Database · checked Sep 23, 2026
25	Business Aspect	Indirect evidence	Toowong, AustraliaHQ checked Sep 23, 2026	51-200	75 contacts →
	Indirect evidence “At Business Aspect, our promise to our clients is to always look at things from a ‘fresh perspective’ and to ensure our engagement with you is based on a clear understanding of…” 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 1,629 big 5 consulting firms based in Australia

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 6,671 reachable decision-makers.

Free signup · no credit card

View the full list →

Big 5 consulting firms based in Australia at a glance

As of Sep 23, 2026

47.4%Verified-email coverage

7.4%Mobile-number coverage

8.6Average contacts per company

1-10Median size (employees)

22.6%Largest-city concentration · Sydney

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

1,164

11-50

357

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

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

Email last verified

Median 25.0d

5,0540–30

1,51731–60

8761–90

290–180

11180+

Company record updated

Median 74.0d

00–30

1,89931–60

7,22661–90

4,09190–180

865180+

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 Australia 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 Australia 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, 6,671 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.

Big 5 consulting firms by metro

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 Australia?

RevenueBase identified 1,629 big 5 consulting firms headquartered in Australia 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?

Atturra, headquartered in Sydney, tops this list with the largest team on record.

Which city has the most big 5 consulting firms?

Sydney leads with 368 headquartered companies, followed by Melbourne (318) and Brisbane (141).

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 6,671 verified decision-maker contacts tracked across these 1,629 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.

Ready to reach these companies? Verified emails and direct dials for all 1,629 big 5 consulting firms based in Australia. Start with a free account, no credit card.

Download this list →

Related lists

Big 5 consulting firms by geography

Browse the directory

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.