Company lists · Data refreshed September 2026

Top 25 Government security companies based in Australia

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 216 companies tracked

RevenueBase identified 216 government security companies headquartered in Australia as of September 2026 and tracks 4,810 professional contacts across them, including 778 with verified work emails. Sydney is the largest hub.

This list covers government 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 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 21, 2026 86% judged on-target in blind review

216Companies

4,810Contacts tracked

778Verified emails

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The 25 largest government security companies based in Australia

Ranked by team size

Top 25 of 216 government security companies based in Australia, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to government security companies: 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	MSS Security	Partial evidence	Parramatta, AustraliaHQ checked Sep 21, 2026	5,001-10,000	2,010 contacts →
	Partial evidence “The MSS Security Group (MSS) comprising MSS Security, MSS Strategic Medical & Rescue and SDS is unrivalled in its experience, capability and reputation.” Source: RevenueBase Database · checked Sep 21, 2026
2	SNP Security	Partial evidence	West Ryde, AustraliaHQ checked Sep 21, 2026	1,001-5,000	510 contacts →
	Partial evidence “Founded in 1923, SNP is one of Australia’s leading security services providers with over 2,500 employees nationwide.” Source: RevenueBase Database · checked Sep 21, 2026
3	Securitas Australia	Partial evidence	Preston, AustraliaHQ checked Sep 21, 2026	10001+	228 contacts →
	Partial evidence “We know how to offer the most effective security to our customers.” Source: RevenueBase Database · checked Sep 21, 2026
4	ADT Security Australia	Indirect evidence	Rydalmere, AustraliaHQ checked Sep 21, 2026	501-1,000	178 contacts →
	Indirect evidence “For more than 130 years, we have stood alongside our community, protecting homes, families, businesses, and communities.” Source: RevenueBase Database · checked Sep 21, 2026
5	ISEC	Strong evidence	Alexandria, AustraliaHQ checked Sep 21, 2026	201-500	87 contacts →
	Strong evidence “Established in 2001, ISEC is a leading provider of protective security, safety, risk management, and training services to the corporate, commercial and government sectors.” Source: RevenueBase Database · checked Sep 21, 2026
6	National Protective Services	Partial evidence	South Melbourne, AustraliaHQ checked Sep 21, 2026	1,001-5,000	82 contacts →
	Partial evidence “National Protective Services is a leading professional security company, specialising in the provision of quality and tailored protective services and products to ensure optimum…” Source: RevenueBase Database · checked Sep 21, 2026
7	AG Security Group	Partial evidence	Adelaide, AustraliaHQ checked Sep 21, 2026	51-200	74 contacts →
	Partial evidence “AG Security Group is South Australia's leading and largest locally owned security organisation that has been protecting Australians for more than 35 years.” Source: RevenueBase Database · checked Sep 21, 2026
8	CPS Security Services	Partial evidence	Epping, AustraliaHQ checked Sep 21, 2026	51-200	65 contacts →
	Partial evidence “We are CPS Security Services, a 100% Australian-owned and operated company founded in 2006.” Source: RevenueBase Database · checked Sep 21, 2026
9	Exec Security	Partial evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	501-1,000	59 contacts →
	Partial evidence “Guarding Solutions \| Armed Guards \| 24/7 Grade A1 Monitoring \| Mobile Patrols \| Electronics \| Advisory EXEC Security is an Australian owned, national company that specialises in…” Source: RevenueBase Database · checked Sep 21, 2026
10	LKA Group	Partial evidence	Carlton, AustraliaHQ checked Sep 21, 2026	51-200	59 contacts →
	Partial evidence “For decades, LKA Group has provided the highest level of service to all clients, from small business to multinational corporations and governments.” Source: RevenueBase Database · checked Sep 21, 2026
11	Advent Security Australia & NEW Zealand	Partial evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	501-1,000	55 contacts →
	Partial evidence “Australian owned Advent Security has been a leader in providing exceptional, value-for-money services to local, national and international clients in the public, private and…” Source: RevenueBase Database · checked Sep 21, 2026
12	Guardian Venue Management International	Partial evidence	Sydney, AustraliaHQ checked Sep 21, 2026	201-500	53 contacts →
	Partial evidence “Guardian Venue Management International is a proudly Australian-owned company, dedicated to delivering the highest standards of Security Solutions, Customized Protection, Traffic…” Source: RevenueBase Database · checked Sep 21, 2026
13	Securcom PTY LTD	Partial evidence	Brendale, AustraliaHQ checked Sep 21, 2026	51-200	51 contacts →
	Partial evidence “Established in the year Securcom has 20 years’ experience as a specialist security solution provider.” Source: RevenueBase Database · checked Sep 21, 2026
14	Vault Protective Security Services	Partial evidence	Subiaco, AustraliaHQ checked Sep 21, 2026	201-500	42 contacts →
	Partial evidence “Founded in 2011, Vault Protective Security Services is a Perth based company and leading provider of crowd control and security services.” Source: RevenueBase Database · checked Sep 21, 2026
15	Best Security PTY LTD	Partial evidence	Clayfield, AustraliaHQ checked Sep 21, 2026	201-500	41 contacts →
	Partial evidence “Security Company in Brisbane” Source: RevenueBase Database · checked Sep 21, 2026
16	Idetect Group	Indirect evidence	Melbourne, AustraliaHQ checked Sep 21, 2026	51-200	34 contacts →
	Indirect evidence “iDetect is proudly Australian owned and operated with a focus on supporting the needs of the building and construction industries throughout Australia.” Source: RevenueBase Database · checked Sep 21, 2026
17	Security1 S1	Partial evidence	Phillip, AustraliaHQ checked Sep 21, 2026	51-200	33 contacts →
	Partial evidence “Security 1 was established as a separate entity in 2001 as the electronic and manpower section of the Newham group which has operated one of the nations leading Locksmith company…” Source: RevenueBase Database · checked Sep 21, 2026
18	Oscar Security Group PTY LTD	Partial evidence	Chipping Norton, AustraliaHQ checked Sep 21, 2026	51-200	28 contacts →
	Partial evidence “Welcome to Oscar Security Group - Your Safety, Our Top Priority We pride ourselves on our people-centric approach, we set the standard for the customer experience by taking…” Source: RevenueBase Database · checked Sep 21, 2026
19	Group 1 Security	Indirect evidence	Sydney, AustraliaHQ checked Sep 21, 2026	201-500	25 contacts →
	Indirect evidence “FreeCall 1800 GROUP 1.” Source: RevenueBase Database · checked Sep 21, 2026
20	AMA Security	Strong evidence	Adelaide, AustraliaHQ checked Sep 21, 2026	51-200	21 contacts →
	Strong evidence “AMA Security is a provider of strategically tailored security solutions for commercial, business & industry, Government and Defence clients.” Source: RevenueBase Database · checked Sep 21, 2026
21	Advanced Security Group	Partial evidence	Tamworth, AustraliaHQ checked Sep 21, 2026	11-50	19 contacts →
	Partial evidence “Advanced Security Group (ASG) Protecting What Is Yours At Advanced Security Group, we pride ourselves on being a trusted partner in safeguarding homes, businesses, and communities…” Source: RevenueBase Database · checked Sep 21, 2026
22	Prime Protection Services NSW	Partial evidence	AustraliaHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “Prime Protection Services can provide for all of your security needs.” Source: RevenueBase Database · checked Sep 21, 2026
23	Safer Community Security	Partial evidence	West Perth, AustraliaHQ checked Sep 21, 2026	51-200	14 contacts →
	Partial evidence “Full suite of security services.” Source: RevenueBase Database · checked Sep 21, 2026
24	Castle Security	Strong evidence	Malaga, AustraliaHQ checked Sep 21, 2026	11-50	14 contacts →
	Strong evidence “With clients in the Commercial, Government industrial, and residential marketplace, Australia-wide, Castle Security has the experience and knowledge to help find a solution for…” Source: RevenueBase Database · checked Sep 21, 2026
25	Excell Security	Partial evidence	Altona North, AustraliaHQ checked Sep 21, 2026	51-200	14 contacts →
	Partial evidence “Excell Security is Melbourne's "one stop shop" for security, specialising in CCTV, alarms, monitoring and access control products and services, plus mobile patrols, security…” Source: RevenueBase Database · checked Sep 21, 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: government security companies. 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 government security companies.
Partial evidence: Its own public description names part of government security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name government security companies. 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 216 government security companies based in Australia

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Government security companies based in Australia at a glance

As of Sep 21, 2026

16.2%Verified-email coverage

22.3Average contacts per company

11-50Median size (employees)

11.6%Largest-city concentration · Sydney

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for Australia, so it is reported there. Company counts and contact totals on this page are exact for Australia, over 216 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 government security companies, 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 Australia whose own description of what they do matches “government security companies”. 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 government security companies), 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 government 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 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, 778 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 21, 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.

Government security companies by metro

Government security companies in Sydney25

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 government security companies, 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 government security companies are there based in Australia?

RevenueBase identified 216 government 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?

MSS Security, headquartered in Parramatta, tops this list with the largest team on record.

Which city has the most government security companies?

Sydney leads with 25 headquartered companies, followed by Melbourne (18) and Brisbane (8).

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 778 verified decision-maker contacts tracked across these 216 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 21, 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.