Company lists · Data verified August 2026

Top 25 Cybersecurity startups based in Australia

Name: Cybersecurity startups based in Australia
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 676 companies tracked

There are 676 cybersecurity startups headquartered in Australia (RevenueBase, August 2026). RevenueBase tracks 6,091 professional contacts across them, including 2,433 with verified work emails and 361 with mobile numbers. Sydney is the largest hub.

This list covers cybersecurity startups headquartered in Australia, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

676Companies

6,091Contacts tracked

2,433Verified emails

361Mobile numbers

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The 25 largest cybersecurity startups based in Australia

Ranked by team size

Top 25 of 676 cybersecurity startups based in Australia, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	PT Itsec Asia TBK	Melbourne	201-500	387	67
2	Webroot	Chatswood	501-1,000	199	75
3	Triskele Labs	Melbourne	51-200	123	89
4	Optic Security Group	Broome	201-500	122	92
5	Infotrust	Sydney	201-500	122	81
6	Renew IT	Canning Vale	51-200	113	55
7	RED Sift	Surry Hills	51-200	109	55
8	Secutec	Sydney	51-200	102	37
9	Sekuro	n/a	51-200	100	70
10	Ever Nimble	Fortitude Valley	51-200	98	79
11	Kaine Mathrick Tech	Sydney	51-200	91	62
12	Northbridge Systems	St Leonards	51-200	70	27
13	Ampion	Melbourne	501-1,000	64	21
14	Entersoft Security	Brisbane	51-200	63	20
15	Skillfield	Melbourne	51-200	61	42
16	RED Piranha	Melbourne	51-200	58	41
17	3columns	n/a	51-200	58	32
18	Deploypartners	North Sydney	51-200	51	24
19	Dimiya Tech	Melbourne	51-200	50	2
20	Emerging IT	Mulgrave	51-200	45	27
21	Firstwave ASX FCT	North Sydney	51-200	42	26
22	Vectra	Melbourne	51-200	42	19
23	Bluerydge	Fyshwick	51-200	39	28
24	Astralas	Cremorne	51-200	35	20
25	Ionize	Canberra	51-200	34	26

Showing 25 of 676 cybersecurity startups based in Australia

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Cybersecurity startups based in Australia at a glance

As of Aug 28, 2026

1-10Median size (employees)

SydneyLargest hub · 148 HQs

361Contacts with mobile numbers

3Emails re-verified in last 30 days

Companies by employee count

1-10

392

11-50

217

51-200

201-500

501-1,000

1,001-5,000

Cybersecurity startups by metro

Metro	Companies
Cybersecurity startups in Sydney	148
Cybersecurity startups in Melbourne	139
Cybersecurity startups in Brisbane	59
Cybersecurity startups in Canberra	36
Cybersecurity startups in Perth	33
Cybersecurity startups in Adelaide	27
Cybersecurity startups in Brisbane City	12

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cybersecurity startups”, with match quality audited by blind human judging, and headquartered in Australia.
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: Contact records re-verify on a rolling cadence; 3 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cybersecurity startups are there based in Australia?

There are 676 cybersecurity startups headquartered in Australia as of August 2026 (RevenueBase).

What is the largest company on this list?

PT Itsec Asia TBK, headquartered in Melbourne, tops this list with the largest team on record.

Which city has the most cybersecurity startups?

Sydney leads with 148 headquartered companies, followed by Melbourne (139) and Brisbane (59).

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 2,433 verified decision-maker contacts tracked across these 676 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.