Company lists · Data refreshed September 2026
Top 25 IT security companies based in New Zealand
RevenueBase identified 79 IT security companies headquartered in New Zealand as of September 2026 and tracks 618 professional contacts across them, including 343 with verified work emails and 14 with mobile numbers. Auckland is the largest hub.
This list covers IT security companies headquartered in New Zealand, 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 4, 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 IT security companies based in New Zealand
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 119 | ||||
“DEFEND are an independent agnostic cyber security partner.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | 93 | ||||
“Bastion Security combines the skills, expertise and leadership from Quantum Security, ZX Security, Helix Security, Cassini and now Cythera.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 48 | ||||
“RedShield is the essential partner for businesses needing an effective security solution for application risks.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | 20 | ||||
“OUR MISSION: Is to play an active and valued role in the New Zealand Information and Cyber Security community.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | 18 | ||||
“With a remarkable track record spanning over 32 years, Silicon has continuously evolved into a trusted technology partner for organisations across various sectors, including…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | 16 | ||||
“At Nectar, we partner with forward-thinking businesses to harness the power of technology in securing their future and driving business efficiency.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 14 | ||||
“Nextro is a cyber, physical, & electronic security systems provider, as well as an ISP/MSSP.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | 14 | ||||
“OptimaTech is passionately committed to transforming businesses across New Zealand, Hong Kong and Asia Pacific by leveraging security-driven technology as the foundation for…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | 13 | ||||
“We are a group of certified IT experts, highly specialised in world-class Network Cybersecurity solutions to improve your overall business performance by solving complex…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | 11 | ||||
“CyberCure is a boutique cyber security and privacy consultancy based in Wellington, NZ.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | 11 | ||||
“Optimyze is a premier provider of comprehensive managed IT Security support services for businesses of all sizes.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 12 | 7 | ||||
Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | 7 | ||||
“Fenrir Security was founded with a rebellious spirt and an audacious goal: to provide technical excellence across cyber security services at an equitable price point while…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 7 | ||||
“Work with us to protect your company quickly.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | 6 | ||||
“Diode is an NZ based security company built on passion for technology and drive to secure customers environments.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 6 | ||||
“A team of cyber security experts, helping businesses build cyber resilience and manage their cyber security risk.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 5 | ||||
“Outfox has a single mission to make businesses more cyber resilient - fully prepared to detect, respond and most importantly recover from cyber-attacks.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 18 | 5 | ||||
“Our mission is clear, to empower Kiwi businesses by fortifying their security posture through comprehensive IT Security Health Checks.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 19 | 4 | ||||
“- IT Security Specialists, known as has been servicing government and corporate clients in New Zealand and across the world for more than 30 years.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | 4 | ||||
“Revolution InfoSec take the geek speak out of Cyber Security.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 4 | ||||
“Cybercraft is dedicated to helping small businesses and not-for-profits stay secure in a digital world.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3 | ||||
“At Tier Zero Security, we are driven by a commitment to fortify the security landscape for organisations through our specialised expertise.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 | ||||
“At Nova Security, we deliver top-tier cybersecurity services including Penetration Testing, Cloud Security Solutions, and Blockchain Security.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 24 | 3 | ||||
“We’re people people, delivering security solutions tailored to your company, whether you’re a fully specced security outfit or just starting on your security journey.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 | ||||
“Cassini Limited is an Information Technology Consultancy based out of Wellington, New Zealand.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 79 IT security companies based in New Zealand
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IT security companies based in New Zealand at a glance
As of Sep 4, 2026Companies by employee count
Verified emails by last verification
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 IT security companies, 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 New Zealand whose own description of what they do matches “IT security companies”. 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 IT security companies, and records with no verified work email. Companies headquartered outside New Zealand 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, 343 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 4, 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.
IT security companies by metro
- IT security companies in Auckland33
Frequently asked
How many IT security companies are there based in New Zealand?
RevenueBase identified 79 IT security companies headquartered in New Zealand 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?
Defend, headquartered in Auckland, tops this list with the largest team on record.
Which city has the most IT security companies?
Auckland leads with 33 headquartered companies, followed by Wellington (24) and Christchurch (6).
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 343 verified decision-maker contacts tracked across these 79 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 4, 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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