Company lists · Data refreshed September 2026
Top 25 Security auditing firms based in Sydney, Australia
RevenueBase identified 101 security auditing firms headquartered in Sydney, Australia as of September 2026 and tracks 557 professional contacts across them, including 230 with verified work emails. Sydney is the largest hub.
This list covers security auditing 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, how directly it supports the match, and when it was last checked. Data refreshed September 6, 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.
The 25 largest security auditing firms based in Sydney, Australia
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 41 | ||||
“Seccom Global - The Cyber Security Company Providing excellence in service to educate, connect and protect your business Founded in 2003, Seccom Global is recognised as a leader…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 33 | ||||
“NSB Cyber is an Australian-founded, privately owned cyber security company based in Sydney.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 31 | ||||
“CSO Group provides ICT security services and solutions to protect Australian businesses from advanced cyber threats.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 26 | ||||
“Minimise the risk of a cybersecurity incident.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 25 | ||||
“For most organisations in Australia, a data breach can be more than a PR disaster, it could be the final chapter.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 23 | ||||
“SilentGrid is an offensive security consultancy with a focus on adversary simulation and penetration testing.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 21 | ||||
“At Empire Technologies, our unwavering dedication to delivering technology solutions can help you drive business success.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 20 | ||||
“Hashlock is the industry leading web3 security auditing firm.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | RazilioIndirect evidence | 19 | |||
“Razilio is a Sydney, Australia-based boutique cybersecurity consultancy that simplifies the management of cyber risk for businesses of all sizes.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 16 | ||||
“Intrix Cyber Security protect businesses with our Information Security Services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 15 | ||||
“cyberSuite is your partner in cyber.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 14 | ||||
“Morrisec provides tailored security strategies and services that align with each company’s specific threat landscape, risk profile, and strategic goals.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 13 | ||||
“At Parabellum, we help organisations see clearly and act confidently in a complex digital world.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 10 | ||||
“With ZIRILIO on your side, the digital world just became safer.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 10 | ||||
“Volkis is a dedicated information security consultancy that provides penetration testing, security assessment, red team, GRC, and training services at its core.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 9 | ||||
“CyberHub was established with the aim of making Cyber Security more available to companies of all sizes.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 8 | ||||
“At Cliffside, we believe the cybersecurity industry has a truth problem: vendors oversell, consultants overcomplicate, and products are pushed over real solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 7 | ||||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 6 | ||||
“CyberPulse partners with organisations to operationalise security across the full threat lifecycle, from governance and compliance through to detection, response, and continuous…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 6 | ||||
“Founded in 2016, Dvuln is a globally CREST-certified cybersecurity firm specialising in advanced penetration testing, adversary simulation, attacker-led threat hunting, and…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 | ||||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 6 | ||||
“Vertex Cyber Security provides an extensive Cyber Security capability of Technology and Security Services for organisations across Sydney.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 5 | ||||
“Fort1: Comprehensive Cybersecurity Services based in Australia.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 5 | ||||
“At D2UNet, we take a multi-faceted approach to cybersecurity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 | ||||
“Who are NSAA Security NSAA Security team have years of experience working within highly demanding information security environments.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 101 security auditing firms based in Sydney, Australia
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Security auditing firms based in Sydney, Australia at a glance
As of Sep 6, 2026Companies by employee count
Email recency for this list is measured across the whole Australia list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Sydney, over 101 companies.
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 auditing firms, 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 Sydney, Australia whose own description of what they do matches “security auditing firms”. 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 security auditing 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 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, 230 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 6, 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 auditing firms by metro in Australia
- Security auditing firms in Sydney101
- Security auditing firms in Melbourne82
- Security auditing firms in Brisbane35
- Security auditing firms in Canberra26
Frequently asked
How many security auditing firms are there based in Sydney, Australia?
RevenueBase identified 101 security auditing 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?
Seccom Global, headquartered in Sydney, tops this list with the largest team on record.
Which city has the most security auditing firms?
Sydney leads with 101 headquartered companies, followed by Melbourne (82) and Brisbane (35).
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 230 verified decision-maker contacts tracked across these 101 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 6, 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.
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