Company lists · Data refreshed September 2026

Top 24 IT security companies based in Australia

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 692 companies tracked

RevenueBase identified 692 IT security companies headquartered in Australia as of September 2026 and tracks 7,695 professional contacts across them, including 3,449 with verified work emails and 445 with mobile numbers. Sydney is the largest hub.

This list covers IT security companies 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

692Companies

7,695Contacts tracked

3,449Verified emails

445Mobile numbers

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The 24 largest IT security companies based in Australia

Ranked by team size

Top 24 of 692 IT security companies based in Australia, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names IT security companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Centorrino TechnologiesPartial evidence	Coburg, AustraliaHQ checked Sep 4, 2026	201-500	349
	“We are an Australian-owned, full-service ICT Solutions and Cyber Security provider with a locally based team of over 450 passionate Aussies.” Source: company website · checked Sep 4, 2026
2	Triskele LabsIndirect evidence	Melbourne, AustraliaHQ checked Sep 4, 2026	51-200	123
	“Triskele Labs is one of Australia’s fastest growing cybersecurity companies.” Source: company website · checked Sep 4, 2026
3	Optic Security GroupPartial evidence	Brisbane Airport, AustraliaHQ checked Sep 4, 2026	201-500	122
	“Optic Security Group is a leading provider of converged security risk management solutions serving the needs of corporate, enterprise, and government clients across Australia and…” Source: company website · checked Sep 4, 2026
4	InfotrustPartial evidence	Sydney, AustraliaHQ checked Sep 4, 2026	201-500	122
	“Infotrust (ITS) is Australia’s leading cyber security and managed technology services provider listed on the ASX.” Source: company website · checked Sep 4, 2026
5	Renew ITStrong evidence	Lane Cove West, AustraliaHQ checked Sep 4, 2026	51-200	113
	“Innovative Managed Services: Bridging Assets, Systems, and Security Welcome to Renew IT, your trusted partner in delivering comprehensive managed services, systems integration…” Source: company website · checked Sep 4, 2026
6	ARA SecurityPartial evidence	Kingsgrove, AustraliaHQ checked Sep 4, 2026	201-500	105
	“ARA Security delivers turnkey security solutions to a number of industries across Australia.” Source: company website · checked Sep 4, 2026
7	SekuroPartial evidence	AustraliaHQ checked Sep 4, 2026	51-200	100
	“Sekuro is a cyber security and digital resiliency solutions provider that helps CIOs and CISOs take a strategic approach to cyber security risk mitigation and building business…” Source: company website · checked Sep 4, 2026
8	Ever NimbleStrong evidence	West Perth, AustraliaHQ checked Sep 4, 2026	51-200	98
	“We are your IT & Cyber Security partners.” Source: company website · checked Sep 4, 2026
9	Kaine Mathrick TechIndirect evidence	Port Melbourne, AustraliaHQ checked Sep 4, 2026	51-200	91
	“Australia’s cyber-first Managed Service Provider and true technology partner.” Source: company website · checked Sep 4, 2026
10	Secure AgilityPartial evidence	Sydney, AustraliaHQ checked Sep 4, 2026	51-200	87
	“Secure Agility is a Australian-based technology partner specialising in secure managed IT services for NSW government, enterprise and mid-market organisations.” Source: company website · checked Sep 4, 2026
11	Northbridge SystemsPartial evidence	St Leonards, AustraliaHQ checked Sep 4, 2026	51-200	70
	“Northbridge is an Australian-owned cybersecurity services provider with more than 25 years’ experience delivering engineered, integrated and fully managed security services to…” Source: company website · checked Sep 4, 2026
12	Entersoft SecurityPartial evidence	Brisbane, AustraliaHQ checked Sep 4, 2026	51-200	63
	“Entersoft Security is an AI-enabled cybersecurity services firm helping modern enterprises build, ship, and operate secure digital products at scale.” Source: company website · checked Sep 4, 2026
13	RED PiranhaIndirect evidence	Perth, AustraliaHQ checked Sep 4, 2026	51-200	58
	“Australia’s leading developer and manufacturer of advanced cybersecurity technology, Red Piranha delivers next-generation cyber defence solutions designed to protect modern…” Source: company website · checked Sep 4, 2026
14	3columnsPartial evidence	AustraliaHQ checked Sep 4, 2026	51-200	58
	“Discover 3Columns, your premier destination for cutting-edge cyber security solutions.” Source: company website · checked Sep 4, 2026
15	Ipsec PTY LTDPartial evidence	Cremorne, AustraliaHQ checked Sep 4, 2026	11-50	57
	“IPSec are specialists in information asset and cyber protection; security experts who know how to mitigate cyber risk by assisting in the protection of valuable intelligence…” Source: company website · checked Sep 4, 2026
16	Fortis SecurityPartial evidence	Melbourne, AustraliaHQ checked Sep 4, 2026	51-200	51
	“Welcome to Fortis Security, founded in September of 2013, Fortis has grown year on year with customer support.” Source: company website · checked Sep 4, 2026
17	DeploypartnersIndirect evidence	North Sydney, AustraliaHQ checked Sep 4, 2026	51-200	51
	“DeployPartners offer unique values and benefits that enable our clients and partners to differentiate on customer service.” Source: company website · checked Sep 4, 2026
18	Wipro SheldeIndirect evidence	Melbourne, AustraliaHQ checked Sep 4, 2026	51-200	50
	“Our mission is to help our clients protect their assets, reputation, and customers from cyber threats, while also enabling them to embrace digital transformation and innovation…” Source: company website · checked Sep 4, 2026
19	Dimiya TechPartial evidence	Melbourne, AustraliaHQ checked Sep 4, 2026	51-200	50
	“DIMIYA Tech is a Melbourne, Australia based- global Cybersecurity and IT services provider supporting organizations that require secure, scalable, and high-performance technology…” Source: company website · checked Sep 4, 2026
20	Emerging ITIndirect evidence	Mulgrave, AustraliaHQ checked Sep 4, 2026	51-200	45
	“Clarity in a complex world.” Source: company website · checked Sep 4, 2026
21	Slipstream CyberIndirect evidence	Perth, AustraliaHQ checked Sep 4, 2026	11-50	42
	“Slipstream Cyber is a business of Interactive - Australia's leading technology solutions provider.” Source: company website · checked Sep 4, 2026
22	Firstwave ASX FCTIndirect evidence	North Sydney, AustraliaHQ checked Sep 4, 2026	51-200	42
	“FirstWave is a global cybersecurity technology company formed in 2004.” Source: company website · checked Sep 4, 2026
23	CytheraPartial evidence	Cbd, AustraliaHQ checked Sep 4, 2026	11-50	42
	“Cythera’s cyber security solutions allow for the rapid deployment of Assessment, Protection, Monitoring & Response and Assurance technologies to meet the security needs of…” Source: company website · checked Sep 4, 2026
24	VectraPartial evidence	Adelaide, AustraliaHQ checked Sep 4, 2026	51-200	42
	“Vectra, an Ensign company, is Australia’s trusted partner for security consulting, risk management, compliance, and managed services.” Source: company website · checked Sep 4, 2026

Showing 24 of 692 IT security companies based in Australia

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IT security companies based in Australia at a glance

As of Sep 4, 2026

1-10Median size (employees)

SydneyLargest hub · 143 HQs

445Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

412

11-50

210

51-200

201-500

501-1,000

1,001-5,000

Verified emails by last verification

0–30

31–60

304

61–90

1,954

90–180

1,168

180+

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 IT security companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Australia whose own description of what they do matches “IT security companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among IT security companies, 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 an evidence 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, 3,449 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 4, 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.

IT security companies by metro

Frequently asked

How many IT security companies are there based in Australia?

RevenueBase identified 692 IT security companies 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?

Centorrino Technologies, headquartered in Coburg, tops this list with the largest team on record.

Which city has the most IT security companies?

Sydney leads with 143 headquartered companies, followed by Melbourne (124) 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 3,449 verified decision-maker contacts tracked across these 692 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 4, 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 SmartSearch, 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.