Company lists · Data verified August 2026

Top 25 Cybersecurity defense contractors based in Australia

Name: Cybersecurity defense contractors based in Australia
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 612 companies tracked

There are 612 cybersecurity defense contractors headquartered in Australia (RevenueBase, August 2026). RevenueBase tracks 8,784 professional contacts across them, including 3,488 with verified work emails and 524 with mobile numbers. Sydney is the largest hub.

This list covers cybersecurity defense contractors headquartered in Australia, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

612Companies

8,784Contacts tracked

3,488Verified emails

524Mobile numbers

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The 25 largest cybersecurity defense contractors based in Australia

Ranked by team size

Top 25 of 612 cybersecurity defense contractors based in Australia, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Leidos Australia	Scoresby	1,001-5,000	965	30
2	PT Itsec Asia TBK	Melbourne	201-500	387	67
3	Centorrino Technologies	Coburg	201-500	349	207
4	Webroot	Chatswood	501-1,000	199	75
5	Aurizn	Adelaide	201-500	157	114
6	Triskele Labs	Melbourne	51-200	123	89
7	Optic Security Group	Broome	201-500	122	92
8	Infotrust	Sydney	201-500	122	81
9	Renew IT	Canning Vale	51-200	113	55
10	RED Sift	Surry Hills	51-200	109	55
11	Aucyber	Fortitude Valley	51-200	105	5
12	Secutec	Sydney	51-200	102	37
13	Sekuro	n/a	51-200	100	70
14	Ever Nimble	Fortitude Valley	51-200	98	79
15	Kaine Mathrick Tech	Sydney	51-200	91	62
16	Informatech PTY LTD	Canberra	51-200	90	36
17	Northbridge Systems	St Leonards	51-200	70	27
18	Ampion	Melbourne	501-1,000	64	21
19	Entersoft Security	Brisbane	51-200	63	20
20	Skillfield	Melbourne	51-200	61	42
21	RED Piranha	Melbourne	51-200	58	41
22	3columns	n/a	51-200	58	32
23	Ctrl Cyber	Sydney	51-200	56	27
24	Deploypartners	North Sydney	51-200	51	24
25	Dimiya Tech	Melbourne	51-200	50	2

Showing 25 of 612 cybersecurity defense contractors based in Australia

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Cybersecurity defense contractors based in Australia at a glance

As of Aug 28, 2026

1-10Median size (employees)

SydneyLargest hub · 125 HQs

524Contacts with mobile numbers

4Emails re-verified in last 30 days

Companies by employee count

1-10

349

11-50

191

51-200

201-500

501-1,000

1,001-5,000

Cybersecurity defense contractors by metro

Metro	Companies
Cybersecurity defense contractors in Sydney	125
Cybersecurity defense contractors in Melbourne	118
Cybersecurity defense contractors in Brisbane	60
Cybersecurity defense contractors in Canberra	41
Cybersecurity defense contractors in Perth	30
Cybersecurity defense contractors in Adelaide	23
Cybersecurity defense contractors in Brisbane City	13

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cybersecurity defense contractors”, with match quality audited by blind human judging, and headquartered in Australia.
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: Contact records re-verify on a rolling cadence; 4 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cybersecurity defense contractors are there based in Australia?

There are 612 cybersecurity defense contractors headquartered in Australia as of August 2026 (RevenueBase).

What is the largest company on this list?

Leidos Australia, headquartered in Scoresby, tops this list with the largest team on record.

Which city has the most cybersecurity defense contractors?

Sydney leads with 125 headquartered companies, followed by Melbourne (118) and Brisbane (60).

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 3,488 verified decision-maker contacts tracked across these 612 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.