Company lists · Data verified August 2026

Top 25 Cybersecurity defense companies based in Australia

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 606 companies tracked

There are 606 cybersecurity defense companies headquartered in Australia (RevenueBase, August 2026). RevenueBase tracks 7,349 professional contacts across them, including 3,279 with verified work emails and 432 with mobile numbers. Sydney is the largest hub.

This list covers cybersecurity defense companies 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.

606Companies

7,349Contacts tracked

3,279Verified emails

432Mobile numbers

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The 25 largest cybersecurity defense companies based in Australia

Ranked by team size

Top 25 of 606 cybersecurity defense companies 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	PT Itsec Asia TBK	Melbourne	201-500	387	67
2	Webroot	Chatswood	501-1,000	199	75
3	Aurizn	Adelaide	201-500	157	114
4	Triskele Labs	Melbourne	51-200	123	89
5	Optic Security Group	Broome	201-500	122	92
6	Infotrust	Sydney	201-500	122	81
7	Renew IT	Canning Vale	51-200	113	55
8	RED Sift	Surry Hills	51-200	109	55
9	Secutec	Sydney	51-200	102	37
10	Sekuro	n/a	51-200	100	70
11	Consunet PTY LTD	Adelaide	51-200	99	74
12	Ever Nimble	Fortitude Valley	51-200	98	79
13	Kaine Mathrick Tech	Sydney	51-200	91	62
14	Informatech PTY LTD	Canberra	51-200	90	36
15	Northbridge Systems	St Leonards	51-200	70	27
16	Entersoft Security	Brisbane	51-200	63	20
17	Skillfield	Melbourne	51-200	61	42
18	E2e-Assure	Canberra	51-200	60	42
19	RED Piranha	Melbourne	51-200	58	41
20	3columns	n/a	51-200	58	32
21	Deploypartners	North Sydney	51-200	51	24
22	Wipro Shelde	Melbourne	51-200	50	15
23	Dimiya Tech	Melbourne	51-200	50	2
24	Emerging IT	Mulgrave	51-200	45	27
25	Firstwave ASX FCT	North Sydney	51-200	42	26

Showing 25 of 606 cybersecurity defense companies based in Australia

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Cybersecurity defense companies based in Australia at a glance

As of Aug 28, 2026

1-10Median size (employees)

SydneyLargest hub · 130 HQs

432Contacts with mobile numbers

4Emails re-verified in last 30 days

Companies by employee count

1-10

350

11-50

190

51-200

201-500

501-1,000

1,001-5,000

Cybersecurity defense companies by metro

Metro	Companies
Cybersecurity defense companies in Sydney	130
Cybersecurity defense companies in Melbourne	119
Cybersecurity defense companies in Brisbane	56
Cybersecurity defense companies in Canberra	38
Cybersecurity defense companies in Perth	30
Cybersecurity defense companies in Adelaide	28
Cybersecurity defense companies in Brisbane City	12

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 companies”, 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 companies are there based in Australia?

There are 606 cybersecurity defense companies headquartered in Australia as of August 2026 (RevenueBase).

What is the largest company on this list?

PT Itsec Asia TBK, headquartered in Melbourne, tops this list with the largest team on record.

Which city has the most cybersecurity defense companies?

Sydney leads with 130 headquartered companies, followed by Melbourne (119) and Brisbane (56).

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 3,279 verified decision-maker contacts tracked across these 606 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.