Company lists · Data refreshed September 2026

Top 25 Security audit firms based in Sydney, Australia

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

Compiled by the RevenueBase Data Team Data refreshed Sep 13, 2026 64 companies tracked

RevenueBase identified 64 security audit firms headquartered in Sydney, Australia as of September 2026 and tracks 282 professional contacts across them, including 96 with verified work emails and 13 with mobile numbers. Sydney is the largest hub.

This list covers security audit firms headquartered in Sydney, 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

64Companies

282Contacts tracked

96Verified emails

13Mobile numbers

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The 25 largest security audit firms based in Sydney, Australia

Ranked by team size

Top 25 of 64 security audit firms based in Sydney, 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	Silentgrid Security	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	23 contacts →
	Partial evidence “SilentGrid is an offensive security consultancy with a focus on adversary simulation and penetration testing.” Source: RevenueBase Database · checked Sep 13, 2026
2	Hashlock	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	20 contacts →
	Partial evidence “Hashlock is the industry leading web3 security auditing firm.” Source: RevenueBase Database · checked Sep 13, 2026
3	Razilio	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	19 contacts →
	Indirect evidence “Razilio is a Sydney, Australia-based boutique cybersecurity consultancy that simplifies the management of cyber risk for businesses of all sizes.” Source: RevenueBase Database · checked Sep 13, 2026
4	Intrix Cyber Security	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	16 contacts →
	Partial evidence “Intrix Cyber Security protect businesses with our Information Security Services.” Source: RevenueBase Database · checked Sep 13, 2026
5	Morrisec	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	14 contacts →
	Partial evidence “Morrisec provides tailored security strategies and services that align with each company’s specific threat landscape, risk profile, and strategic goals.” Source: RevenueBase Database · checked Sep 13, 2026
6	Parabellum	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	13 contacts →
	Indirect evidence “At Parabellum, we help organisations see clearly and act confidently in a complex digital world.” Source: RevenueBase Database · checked Sep 13, 2026
7	Volkis	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	10 contacts →
	Partial evidence “Volkis is a dedicated information security consultancy that provides penetration testing, security assessment, red team, GRC, and training services at its core.” Source: RevenueBase Database · checked Sep 13, 2026
8	Cyberhub Group	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	9 contacts →
	Partial evidence “CyberHub was established with the aim of making Cyber Security more available to companies of all sizes.” Source: RevenueBase Database · checked Sep 13, 2026
9	Cliffside Cybersecurity	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	8 contacts →
	Indirect evidence “At Cliffside, we believe the cybersecurity industry has a truth problem: vendors oversell, consultants overcomplicate, and products are pushed over real solutions.” Source: RevenueBase Database · checked Sep 13, 2026
10	Iqbox PTY LTD	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	7 contacts →
	Partial evidence “IQBOX helps you pinpoint your organization’s most pressing vulnerabilities, eliminate critical threats, and implement a security program that leaves you free to focus on…” Source: RevenueBase Database · checked Sep 13, 2026
11	Cyberpulse	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	6 contacts →
	Partial evidence “CyberPulse partners with organisations to operationalise security across the full threat lifecycle, from governance and compliance through to detection, response, and continuous…” Source: RevenueBase Database · checked Sep 13, 2026
12	Cyberlinx	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	6 contacts →
	Partial evidence “Cyberlinx is a premier cyber security solutions and services provider, we offer a comprehensive range of cyber security solutions, including, infrastructure and network security…” Source: RevenueBase Database · checked Sep 13, 2026
13	Vertex Cyber Security	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	6 contacts →
	Partial evidence “Vertex Cyber Security provides an extensive Cyber Security capability of Technology and Security Services for organisations across Sydney.” Source: RevenueBase Database · checked Sep 13, 2026
14	Fort1 PTY LTD	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	5 contacts →
	Indirect evidence “Fort1: Comprehensive Cybersecurity Services based in Australia.” Source: RevenueBase Database · checked Sep 13, 2026
15	D2unet PTY LTD	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	5 contacts →
	Indirect evidence “At D2UNet, we take a multi-faceted approach to cybersecurity.” Source: RevenueBase Database · checked Sep 13, 2026
16	Nsaa Security	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	5 contacts →
	Partial evidence “Who are NSAA Security NSAA Security team have years of experience working within highly demanding information security environments.” Source: RevenueBase Database · checked Sep 13, 2026
17	Centropy Services & Solutions	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	4 contacts →
	Indirect evidence “The term Centropy is a scientific reference to the reversal of chaos or entropy.” Source: RevenueBase Database · checked Sep 13, 2026
18	Patterned Security	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	4 contacts →
	Partial evidence “At Patterned Security, we focus on building modern approaches to security strategy, architecture and design.” Source: RevenueBase Database · checked Sep 13, 2026
19	Renaissance IT	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	11-50	4 contacts →
	Partial evidence “At Renaissance IT, we provide cyber security consulting and training.” Source: RevenueBase Database · checked Sep 13, 2026
20	Undark Solutions Undark.io	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	2 contacts →
	Indirect evidence “Undark Solutions, a boutique cybersecurity consultancy founded in 2009, empowers enterprises with robust offensive & defensive solutions, including preventative strategies &…” Source: RevenueBase Database · checked Sep 13, 2026
21	Walking Comet	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	2 contacts →
	Indirect evidence “Imagine knowing your business, staff, and customers could be under threat.” Source: RevenueBase Database · checked Sep 13, 2026
22	Grc4	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	2 contacts →
	Indirect evidence “GRC4 specialises in a range of services designed to fortify your business and streamline your operations.” Source: RevenueBase Database · checked Sep 13, 2026
23	Aurian Security	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	2 contacts →
	Partial evidence “Aurian is a leading provider of information security services in Australia.” Source: RevenueBase Database · checked Sep 13, 2026
24	Xigsaw	Partial evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	2 contacts →
	Partial evidence “XIGSAW IS SOLVING THE IT SECURITY PUZZLE Businesses buy on advise and desire the best outcome.” Source: RevenueBase Database · checked Sep 13, 2026
25	Core Sentinel	Indirect evidence	Sydney, AustraliaHQ checked Sep 13, 2026	1-10	2 contacts →
	Indirect evidence “Core Sentinel: Australia’s Premier Penetration Testing & Cybersecurity Experts.” 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 64 security audit firms based in Sydney, Australia

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Security audit firms based in Sydney, Australia at a glance

As of Sep 13, 2026

34.0%Verified-email coverage

4.6%Mobile-number coverage

4.4Average contacts per company

1-10Median size (employees)

68.8%Largest-city concentration · Sydney

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

11-50

Freshness & accuracy

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

Email last verified

Median 16.0d

810–30

1531–60

061–90

090–180

0180+

Company record updated

Median 64.0d

00–30

12631–60

9961–90

3090–180

27180+

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 Sydney, 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 Sydney 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, 96 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 Sydney, Australia?

RevenueBase identified 64 security audit firms headquartered in Sydney, 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?

Silentgrid Security, headquartered in Sydney, 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 96 verified decision-maker contacts tracked across these 64 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.