Company lists · Data refreshed September 2026

Top 25 Security audit firms based in Melbourne, Australia

Name: Security audit firms based in Melbourne, Australia
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 13, 2026 57 companies tracked

RevenueBase identified 57 security audit firms headquartered in Melbourne, Australia as of September 2026 and tracks 477 professional contacts across them, including 177 with verified work emails and 22 with mobile numbers. Sydney is the largest hub.

This list covers security audit firms headquartered in Melbourne, 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 13, 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 13, 2026 86% judged on-target in blind review

57Companies

477Contacts tracked

177Verified emails

22Mobile numbers

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The 25 largest security audit firms based in Melbourne, Australia

Ranked by team size

Top 25 of 57 security audit firms based in Melbourne, Australia, ranked by team size, largest first. Data refreshed Sep 13, 2026. RevenueBase Smart Search rates how each company's information relates to security audit 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	Triskele Labs	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	51-200	123 contacts →
	Indirect evidence “Triskele Labs is one of Australia’s fastest growing cybersecurity companies.” Source: RevenueBase Database · checked Sep 13, 2026
2	Borderless CS	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	26 contacts →
	Indirect evidence “About Us - Australia’s leading cybersecurity specialist, delivering comprehensive protection by Australian-based consultants only-no offshore teams- 100% cybersecurity-focused…” Source: RevenueBase Database · checked Sep 13, 2026
3	Fortian	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	25 contacts →
	Partial evidence “Fortian is a leading Australian company specialising in cyber security, privacy, and technology risk management.” Source: RevenueBase Database · checked Sep 13, 2026
4	Cybersecon	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	18 contacts →
	Partial evidence “CyberSecOn is an Information security company with a presence in Australia, USA and India.” Source: RevenueBase Database · checked Sep 13, 2026
5	Cosive	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	13 contacts →
	Partial evidence “We help organisations get better at Security Operations and Cyber Threat Intelligence with specialised consulting, engineering, and managed security platforms.” Source: RevenueBase Database · checked Sep 13, 2026
6	Cyberrisk	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	11 contacts →
	Partial evidence “Information security and technology risk management consulting - at CyberRisk we design, implement and operate information security programs to allow you to reduce and manage your…” Source: RevenueBase Database · checked Sep 13, 2026
7	Proveho Networks	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	5 contacts →
	Partial evidence “Secure computing and digital security transformation.” Source: RevenueBase Database · checked Sep 13, 2026
8	Itsec Australia NEW Zealand	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	201-500	5 contacts →
	Indirect evidence “ITSEC Australia & New Zealand helps organisations build resilience across IT, OT, and IoT environments.” Source: RevenueBase Database · checked Sep 13, 2026
9	Trusted Impact PTY LTD	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	5 contacts →
	Partial evidence “With a singular focus on "Information Security", Trusted Impact prides itself on delivering demonstrable business outcomes by applying an independent perspective and by leveraging…” Source: RevenueBase Database · checked Sep 13, 2026
10	Cyberzone Global	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	5 contacts →
	Partial evidence “At CyberZone Global, we provide expert cyber advisory, security testing, consulting, Artificial Intelligence and cyber security training services tailored to your organisation’s…” Source: RevenueBase Database · checked Sep 13, 2026
11	Secure Alley	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	5 contacts →
	Indirect evidence “Secure Alley is an IT and cybersecurity company built for the realities of today’s AI-driven digital landscape.” Source: RevenueBase Database · checked Sep 13, 2026
12	Cyber Forte	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	5 contacts →
	Partial evidence “Cyber Forte is an Australian owned Cyber Security company with headquarters in Melbourne.” Source: RevenueBase Database · checked Sep 13, 2026
13	Pure.Security A Tesserent Company	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	51-200	2 contacts →
	Partial evidence “Pure Security is part of the Tesserent group, and is rebranding as Tesserent - Australia's largest ASX listed cybersecurity company (ASX:TNT).” Source: RevenueBase Database · checked Sep 13, 2026
14	Cyber XL	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	2 contacts →
	Indirect evidence “Products and services” Source: RevenueBase Database · checked Sep 13, 2026
15	Intec1	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	51-200	1 contacts →
	Partial evidence “Proudly Australian-owned, InTec1 is a leading provider of professional security consulting services to the government, commercial and critical infrastructure sectors.” Source: RevenueBase Database · checked Sep 13, 2026
16	Global Sentynel	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	1 contacts →
	Indirect evidence “Global Sentynel is a consulting company that commenced operations in June 2023 in Australia, the United States, and Mexico.” Source: RevenueBase Database · checked Sep 13, 2026
17	4walls Cyber Advisory	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	11-50	1 contacts →
	Indirect evidence “4walls helps directors, owners and executives answer three big questions: Where do we stand?” Source: RevenueBase Database · checked Sep 13, 2026
18	Nexjen Consulting	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Indirect evidence “NexJen is a consultancy that specializes in the collaborative evaluation of an organization’s cybersecurity maturity.” Source: RevenueBase Database · checked Sep 13, 2026
19	Procyber PTY LTD	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Partial evidence “About Procyber An independent consulting company formed by a passionate information security professional.” Source: RevenueBase Database · checked Sep 13, 2026
20	Cyber Sense	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Indirect evidence “Cyber Sense is a leading Australian cybersecurity consultancy that simplifies the management of cyber risk by providing innovative governance, risk, and compliance (GRC) solutions…” Source: RevenueBase Database · checked Sep 13, 2026
21	Scottyitpro	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Indirect evidence “We specialize in cyber resilience, helping businesses stay secure and compliant in a rapidly evolving digital world.” Source: RevenueBase Database · checked Sep 13, 2026
22	Scolyer-Gray Consulting Services	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Partial evidence “Scolyer-Gray Consulting Services is an independent cyber & information security consulting service provider.” Source: RevenueBase Database · checked Sep 13, 2026
23	Cashel Group Consulting PTY LTD	Partial evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Partial evidence “Quality IT Security Services Cashel Group is a niche Cyber Security Services Company.” Source: RevenueBase Database · checked Sep 13, 2026
24	Cyberoxide	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Indirect evidence “CyberOxide - Your Trusted Partner in Cybersecurity CyberOxide is your dedicated partner in safeguarding Australian businesses from the ever-evolving threat of cyberattacks.” Source: RevenueBase Database · checked Sep 13, 2026
25	9th Mind Advisory	Indirect evidence	Melbourne, AustraliaHQ checked Sep 13, 2026	1-10	1 contacts →
	Indirect evidence “At 9th Mind Advisory, we're committed to empowering businesses to discover, assess, mitigate, and manage cyber and compliance risks in today's rapidly evolving digital landscape.” Source: RevenueBase Database · checked Sep 13, 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: security audit 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 security audit firms.
Partial evidence: Its own public description names part of security audit firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name security audit 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 57 security audit firms based in Melbourne, Australia

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Security audit firms based in Melbourne, Australia at a glance

As of Sep 13, 2026

37.1%Verified-email coverage

4.6%Mobile-number coverage

8.4Average contacts per company

1-10Median size (employees)

77.2%Largest-city concentration · Sydney

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Freshness & accuracy

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

Email last verified

Median 15.0d

1450–30

2931–60

361–90

090–180

0180+

Company record updated

Median 63.0d

00–30

21231–60

19061–90

3890–180

37180+

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 security audit 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 Melbourne, Australia whose own description of what they do matches “security audit 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 security audit 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 security audit firms, and records with no verified work email. Companies headquartered outside Melbourne 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, 177 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 13, 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.

Security audit firms by metro in Australia

Security audit firms in Sydney44
Security audit firms in Melbourne43

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 security audit 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 security audit firms are there based in Melbourne, Australia?

RevenueBase identified 57 security audit firms headquartered in Melbourne, 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?

Triskele Labs, headquartered in Melbourne, tops this list with the largest team on record.

Which city has the most security audit firms?

Sydney leads with 44 headquartered companies, followed by Melbourne (43) and Brisbane (16).

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 177 verified decision-maker contacts tracked across these 57 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 13, 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.