Company lists · Data verified August 2026

Top 25 Cybersecurity incident response firms based in Australia

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 376 companies tracked

There are 376 cybersecurity incident response firms headquartered in Australia (RevenueBase, August 2026). RevenueBase tracks 4,761 professional contacts across them, including 1,981 with verified work emails and 244 with mobile numbers. Sydney is the largest hub.

This list covers cybersecurity incident response firms 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.

376Companies

4,761Contacts tracked

1,981Verified emails

244Mobile numbers

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The 25 largest cybersecurity incident response firms based in Australia

Ranked by team size

Top 25 of 376 cybersecurity incident response firms 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	Triskele Labs	Melbourne	51-200	123	89
3	Optic Security Group	Broome	201-500	122	92
4	RED Sift	Surry Hills	51-200	109	55
5	Secutec	Sydney	51-200	102	37
6	Sekuro	n/a	51-200	100	70
7	Northbridge Systems	St Leonards	51-200	70	27
8	Entersoft Security	Brisbane	51-200	63	20
9	E2e-Assure	Canberra	51-200	60	42
10	RED Piranha	Melbourne	51-200	58	41
11	Ipsec PTY LTD	Cremorne	11-50	57	35
12	Emerging IT	Mulgrave	51-200	45	27
13	Slipstream Cyber	St Leonards	11-50	42	28
14	Vectra	Melbourne	51-200	42	19
15	Ionize	Canberra	51-200	34	26
16	OP Innovate	Canberra	11-50	34	21
17	Cybernara	Adelaide	11-50	29	5
18	Silentgrid Security	Sydney	11-50	22	12
19	GCIT	Burleigh Heads	11-50	19	8
20	NCC Group Apac	Sydney	1,001-5,000	18	8
21	Retrospect Labs	Melbourne	11-50	17	10
22	Sinevis	n/a	11-50	17	6
23	Cube Cyber	Perth	11-50	16	13
24	Secure ISS	Southport	11-50	16	9
25	VIDEN	Braddon	51-200	16	7

Showing 25 of 376 cybersecurity incident response firms based in Australia

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Cybersecurity incident response firms based in Australia at a glance

As of Aug 28, 2026

1-10Median size (employees)

SydneyLargest hub · 82 HQs

244Contacts with mobile numbers

4Emails re-verified in last 30 days

Companies by employee count

1-10

223

11-50

117

51-200

201-500

1,001-5,000

Cybersecurity incident response firms by metro

Metro	Companies
Cybersecurity incident response firms in Sydney	82
Cybersecurity incident response firms in Melbourne	82
Cybersecurity incident response firms in Brisbane	33
Cybersecurity incident response firms in Canberra	24
Cybersecurity incident response firms in Perth	21
Cybersecurity incident response firms in Adelaide	13
Cybersecurity incident response firms in Brisbane City	10

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 incident response firms”, 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; 4 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 incident response firms are there based in Australia?

There are 376 cybersecurity incident response firms 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 incident response firms?

Sydney leads with 82 headquartered companies, followed by Melbourne (82) and Brisbane (33).

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 1,981 verified decision-maker contacts tracked across these 376 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.