Company lists · Data refreshed September 2026

Top 25 Infrastructure conglomerates based in Australia

Name: Infrastructure conglomerates based in Australia
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 859 companies tracked

RevenueBase identified 859 infrastructure conglomerates headquartered in Australia as of September 2026 and tracks 75,395 professional contacts across them, including 20,980 with verified work emails. Sydney is the largest hub.

This list covers infrastructure conglomerates 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 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

859Companies

75,395Contacts tracked

20,980Verified emails

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The 25 largest infrastructure conglomerates based in Australia

Ranked by team size

Top 25 of 859 infrastructure conglomerates based in Australia, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to infrastructure conglomerates: 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	Downer	Indirect evidence	North Ryde, AustraliaHQ checked Sep 20, 2026	10001+	10,666 contacts →
	Indirect evidence “Enabling communities to thrive.” Source: RevenueBase Database · checked Sep 20, 2026
2	UGL	Indirect evidence	North Sydney, AustraliaHQ checked Sep 20, 2026	5,001-10,000	5,965 contacts →
	Indirect evidence “UGL is CIMIC Group's specialist end-to-end engineering, services and operations provider.” Source: RevenueBase Database · checked Sep 20, 2026
3	SMEC	Indirect evidence	North Sydney, AustraliaHQ checked Sep 20, 2026	5,001-10,000	5,231 contacts →
	Indirect evidence “SMEC is a global engineering, management and development consultancy with a 70-year history of delivering advanced solutions on a global scale across urban development…” Source: RevenueBase Database · checked Sep 20, 2026
4	CPB Contractors	Partial evidence	North Sydney, AustraliaHQ checked Sep 20, 2026	10001+	5,171 contacts →
	Partial evidence “CPB Contractors is a leading major contractor, trusted to build critical and complex infrastructure across Australia and New Zealand for a more connected, sustainable future.” Source: RevenueBase Database · checked Sep 20, 2026
5	BORAL	Indirect evidence	North Ryde, AustraliaHQ checked Sep 20, 2026	5,001-10,000	3,204 contacts →
	Indirect evidence “Boral is the largest vertically-integrated construction materials company in Australia.” Source: RevenueBase Database · checked Sep 20, 2026
6	SRG Global	Partial evidence	Perth, AustraliaHQ checked Sep 20, 2026	1,001-5,000	2,289 contacts →
	Partial evidence “SRG Global is a diversified infrastructure services company.” Source: RevenueBase Database · checked Sep 20, 2026
7	Service Stream	Indirect evidence	Docklands, AustraliaHQ checked Sep 20, 2026	1,001-5,000	1,823 contacts →
	Indirect evidence “Service Stream plays a vital role, working with our clients in keeping communities connected to essential network services across Australia.” Source: RevenueBase Database · checked Sep 20, 2026
8	Seymour Whyte	Partial evidence	Eight Mile Plains, AustraliaHQ checked Sep 20, 2026	501-1,000	818 contacts →
	Partial evidence “Seymour Whyte is a multi award-winning civil contractor that delivers major essential infrastructure across Australia.” Source: RevenueBase Database · checked Sep 20, 2026
9	ICON	Indirect evidence	Richmond, AustraliaHQ checked Sep 20, 2026	501-1,000	777 contacts →
	Indirect evidence “Icon is a globally connected, integrated construction group trusted to build what matters most.” Source: RevenueBase Database · checked Sep 20, 2026
10	DT Infrastructure	Partial evidence	Brisbane City, AustraliaHQ checked Sep 20, 2026	1,001-5,000	699 contacts →
	Partial evidence “DT Infrastructure is a fresh name in Australia’s construction industry.” Source: RevenueBase Database · checked Sep 20, 2026
11	WGA Wallbridge Gilbert Aztec	Indirect evidence	Adelaide, AustraliaHQ checked Sep 20, 2026	501-1,000	586 contacts →
	Indirect evidence “We like to think of ourselves as one of the leading Engineering and Project Management companies across Australia and New Zealand.” Source: RevenueBase Database · checked Sep 20, 2026
12	Abergeldie Complex Infrastructure	Indirect evidence	Regents Park, AustraliaHQ checked Sep 20, 2026	501-1,000	543 contacts →
	Indirect evidence “Abergeldie is a locally owned contractor with 30 years industry experience in Australia and New Zealand.” Source: RevenueBase Database · checked Sep 20, 2026
13	Delta Group	Indirect evidence	Port Melbourne, AustraliaHQ checked Sep 20, 2026	1,001-5,000	537 contacts →
	Indirect evidence “Delta Group offer diversified and integrated contracting capabilities that shape the urban and industrial landscapes of tomorrow.” Source: RevenueBase Database · checked Sep 20, 2026
14	AVENG	Indirect evidence	Richmond, AustraliaHQ checked Sep 20, 2026	5,001-10,000	521 contacts →
	Indirect evidence “For more than 125 years, Aveng has evolved in character, capacity and reach and continues to make its mark across the globe.” Source: RevenueBase Database · checked Sep 20, 2026
15	Gamuda Australia	Partial evidence	North Sydney, AustraliaHQ checked Sep 20, 2026	201-500	458 contacts →
	Partial evidence “Established in 1976 and listed on the Kuala Lumpur Stock Exchange (KLSE) in 1992, Gamuda delivers innovative world-class infrastructure, concessions and communities development.” Source: RevenueBase Database · checked Sep 20, 2026
16	Nacap PTY LTD	Partial evidence	Doncaster, AustraliaHQ checked Sep 20, 2026	201-500	441 contacts →
	Partial evidence “Nacap is a leading energy infrastructure contractor with four decades of global experience in delivering large-scale and complex energy infrastructure projects to power…” Source: RevenueBase Database · checked Sep 20, 2026
17	Martinus	Partial evidence	AustraliaHQ checked Sep 20, 2026	1,001-5,000	360 contacts →
	Partial evidence “Martinus is an Australian owned, industry leading, full-service railway infrastructure company that builds and maintains large scale railways and intermodals across Australia, New…” Source: RevenueBase Database · checked Sep 20, 2026
18	GPA Engineering	Indirect evidence	Unley, AustraliaHQ checked Sep 20, 2026	201-500	346 contacts →
	Indirect evidence “A highly experienced, multidisciplinary engineering and management firm, GPA has consulted and provided engineering, procurement and construction management (EPCM) services, since…” Source: RevenueBase Database · checked Sep 20, 2026
19	HUMES	Indirect evidence	Milton, AustraliaHQ checked Sep 20, 2026	501-1,000	296 contacts →
	Indirect evidence “Humes is a division of Holcim Australia and the nation's leading civil precast concrete manufacturer.” Source: RevenueBase Database · checked Sep 20, 2026
20	ADG Engineers	Indirect evidence	Toowong, AustraliaHQ checked Sep 20, 2026	201-500	290 contacts →
	Indirect evidence “ADG, proudly part of AtkinsRéalis since December 2025, combines decades of multi-sector experience with a diverse range of established and emerging engineering disciplines…” Source: RevenueBase Database · checked Sep 20, 2026
21	Plenary Group	Partial evidence	Melbourne, AustraliaHQ checked Sep 20, 2026	201-500	249 contacts →
	Partial evidence “Plenary is a leading developer, investor and manager of infrastructure and real assets, specialising in public-private partnerships, precinct developments and community…” Source: RevenueBase Database · checked Sep 20, 2026
22	Atco Australia	Partial evidence	Perth, AustraliaHQ checked Sep 20, 2026	51-200	240 contacts →
	Partial evidence “ATCO's Australian operations are headquartered in Perth, Western Australia and specialises in creating innovative, customer focused energy and infrastructure solutions.” Source: RevenueBase Database · checked Sep 20, 2026
23	Systra ANZ	Indirect evidence	North Sydney, AustraliaHQ checked Sep 20, 2026	201-500	232 contacts →
	Indirect evidence “SYSTRA ANZ is a world leading consulting and engineering firm specialising in transportation, security & technology.” Source: RevenueBase Database · checked Sep 20, 2026
24	Freyssinet Australia	Indirect evidence	Macquarie Park, AustraliaHQ checked Sep 20, 2026	201-500	220 contacts →
	Indirect evidence “Freyssinet is a versatile contractor that offers innovative solutions spanning from design to implementation for Specialist Civil Engineering and Structure Remediation projects.” Source: RevenueBase Database · checked Sep 20, 2026
25	Whittens	Partial evidence	Maroochydore, AustraliaHQ checked Sep 20, 2026	501-1,000	213 contacts →
	Partial evidence “As a specialist infrastructure, construction and services contractor, Whittens provides clients with a single source solution at every stage of the construction cycle, from early…” 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: infrastructure conglomerates. 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 infrastructure conglomerates.
Partial evidence: Its own public description names part of infrastructure conglomerates, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name infrastructure conglomerates. 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 859 infrastructure conglomerates based in Australia

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Infrastructure conglomerates based in Australia at a glance

As of Sep 20, 2026

27.8%Verified-email coverage

87.8Average contacts per company

11-50Median size (employees)

9.1%Largest-city concentration · Sydney

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

260

11-50

326

51-200

175

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for Australia, so it is reported there. Company counts and contact totals on this page are exact for Australia, over 859 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 infrastructure conglomerates, 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 “infrastructure conglomerates”. 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 infrastructure conglomerates), 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 infrastructure conglomerates, 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, 20,980 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.

Infrastructure conglomerates 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 infrastructure conglomerates, 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 infrastructure conglomerates are there based in Australia?

RevenueBase identified 859 infrastructure conglomerates 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?

Downer, headquartered in North Ryde, tops this list with the largest team on record.

Which city has the most infrastructure conglomerates?

Sydney leads with 78 headquartered companies, followed by Melbourne (73) and Brisbane (61).

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 20,980 verified decision-maker contacts tracked across these 859 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.