# 28 leading cybersecurity companies in Ontario

Tamtam tracks 28 cybersecurity companies headquartered in Ontario. This list ranks all of them by number of employees on LinkedIn, led by OpenText, KPMG Canada and 1Password. Their median headcount is 151. Half of them were founded in 2005 or later. The most common headquarters are Toronto (11), Mississauga (4) and Waterloo (4).

These companies in Ontario specialize in cybersecurity and IT services, with a strong presence in software development. They range from large established firms to mid-sized and younger companies. Notably, OpenText specializes in information management, 1Password focuses on secure access, BlackBerry provides intelligent software for enterprises, and eSentire offers managed detection and response services.

The data shows a significant concentration of these companies in the Greater Toronto Area and Waterloo, suggesting these cities are key hubs for cybersecurity and software development within Ontario. Many of these firms were founded in the early 2000s, indicating a period of growth in the sector.

🇨🇦 Ontario · 28 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [OpenText](https://www.tamtam.ai/c/opentext) (opentext.com)<br>It specializes in Information Management, assisting businesses of all sizes in securely capturing, governing, and exchanging information globally. | Software Development | 🇨🇦 Waterloo | 22,990 | 1991 |
| 2 | [KPMG Canada](https://www.tamtam.ai/c/kpmg-canada) (kpmg.com)<br>Providing audit, tax, and advisory services to public, private, nonprofit, and public sector organizations across Canada with professionalism. | Financial Services | 🇨🇦 Toronto | 10,017 |  |
| 3 | [1Password](https://www.tamtam.ai/c/1password) (1password.com)<br>Protects business data, employee accounts, and sensitive information with secure access, sharing, and integration into existing systems. | Computer and Network Security | 🇨🇦 Toronto | 3,074 | 2005 |
| 4 | [BlackBerry](https://www.tamtam.ai/c/blackberry) (blackberry.com)<br>Provides intelligent software and services to enterprises and governments, enabling transformative applications, new revenue streams, and innovative business models with safety, security, and reliability. | Software Development | 🇨🇦 Waterloo | 2,005 |  |
| 5 | [N-able](https://www.tamtam.ai/c/n-able)<br>Provides comprehensive software solutions for managed service providers, enabling remote monitoring, management, security, and data protection for their small and medium-sized business clients. | Software Development | 🇨🇦 | 1,341 | 2000 |
| 6 | [BlueCat](https://www.tamtam.ai/c/bluecat) (bluecatnetworks.com)<br>Provides services and solutions for automated DDI management, network security, multicloud management, and network observability supporting cloud adoption and automation. | Software Development | 🇨🇦 Toronto | 728 | 2001 |
| 7 | [eSentire](https://www.tamtam.ai/c/esentire) (esentire.com)<br>Managed detection and response services protecting organizations worldwide from cyber threats using machine learning, threat hunting, and expert security operations. | Computer and Network Security | 🇨🇦 Waterloo | 580 | 2001 |
| 8 | [OnX](https://www.tamtam.ai/c/onx) (onx.com)<br>Leading provider of technology solutions in Canada, offering services like AI, application modernization, cybersecurity, and cloud management to various organizations. | IT Services and IT Consulting | 🇨🇦 Toronto | 477 | 1983 |
| 9 | [Wipro Limited Canada](https://www.tamtam.ai/c/wipro-limited-canada) (wipro.com)<br>Leading global IT consulting & BPO services provider using cutting-edge technologies to help clients thrive in the digital era | IT Services and IT Consulting | 🇨🇦 Toronto | 464 |  |
| 10 | [Jolera](https://www.tamtam.ai/c/jolera) (jolera.com)<br>This company offers next-generation managed services and solutions to MSPs and IT providers worldwide, with a focus on top-notch customer experience | IT Services and IT Consulting | 🇨🇦 Toronto | 405 | 2001 |
| 11 | [ADGA Group](https://www.tamtam.ai/c/adga-group) (adga.ca)<br>Canadian defence company providing cybersecurity, simulation, systems engineering, and program management services for government and industry clients. | Professional Services | 🇨🇦 Ottawa | 330 | 1967 |
| 12 | [Tailscale](https://www.tamtam.ai/c/tailscale) (tailscale.com)<br>Tailscale offers secure, private networks for teams with quick setup, low latency, and compatibility with existing services, replacing traditional corporate VPNs | Software Development | 🇨🇦 Toronto | 326 | 2019 |
| 13 | [Calian IT & Cyber Solutions](https://www.tamtam.ai/c/calian-it-and-cyber-solutions) (calian.com)<br>Global provider of IT & Cyber Solutions, digital healthcare, and application modernization Offering proactive, scalable solutions to drive innovation for various industries | IT Services and IT Consulting | 🇨🇦 Ottawa | 230 | 1982 |
| 14 | [Field Effect](https://www.tamtam.ai/c/field-effect) (fieldeffect.com)<br>Cyber security company providing threat detection, monitoring, training, and compliance solutions for small and mid-size businesses with sophisticated technology and actionable insights | Computer and Network Security | 🇨🇦 Ottawa | 151 | 2016 |
| 15 | [IT Weapons](https://www.tamtam.ai/c/it-weapons) (itweapons.ca)<br>Provider of IT services, hybrid cloud solutions, information security, connectivity, infrastructure management, and technical support to streamline and optimize technology environments for businesses | IT Services and IT Consulting | 🇨🇦 Mississauga | 109 | 2000 |
| 16 | [Bell Cyber](https://www.tamtam.ai/c/bell-cyber) (business.bell.ca)<br>Next-generation managed security services provider, driving superior cybersecurity outcomes through an innovative "Security-as-a-Service" model, leveraging a cybersecurity mesh architecture. | Computer and Network Security | 🇨🇦 Mississauga | 109 | 2013 |
| 17 | [AllHeart Web](https://www.tamtam.ai/c/allheart-web) (allheartweb.com)<br>A global AI-driven company offers user-friendly datasets, cybersecurity solutions, lead generation services, and digital visibility enhancement to clients worldwide | Technology, Information and Internet | 🇨🇦 Mississauga | 52 | 2011 |
| 18 | [AUGMENTT](https://www.tamtam.ai/c/augmentt) (augmentt.com)<br>Centralized SaaS security platform for MSPs to deliver managed security services for Microsoft and cloud apps, offering visibility, protection, and threat detection | IT Services and IT Consulting | 🇨🇦 Kanata | 44 | 2020 |
| 19 | [Audcomp](https://www.tamtam.ai/c/audcomp) (audcomp.com)<br>A Canadian IT solutions provider offering managed services, cloud services, IT infrastructure, data storage, networking, software, procurement, and professional services | IT Services and IT Consulting | 🇨🇦 Ancaster | 34 | 1986 |
| 20 | [CyBeats](https://www.tamtam.ai/c/cybeats) (cybeats.com)<br>Leader in software supply chain security, offering continuous end-to-end protection for software and devices with proactive threat prevention and quick vulnerability response | Computer and Network Security | 🇨🇦 Toronto | 32 | 2018 |
| 21 | [IAMConcepts](https://www.tamtam.ai/c/iamconcepts) (iamconcepts.ca)<br>A Canadian cybersecurity consulting firm specializing in Enterprise Identity and Access Management solutions for clients in Canada, the US, and Europe | IT Services and IT Consulting | 🇨🇦 Toronto | 20 | 2013 |
| 22 | [KTI](https://www.tamtam.ai/c/kti) (kearnstechnology.com)<br>A managed services company and hardware supplier with a team of advanced developers specializing in machine learning, databases, cloud-based solutions, and design | IT Services and IT Consulting | 🇨🇦 Toronto | 17 | 2010 |
| 23 | [Autohost](https://www.tamtam.ai/c/autohost) (autohost.ai)<br>Specializing in identity verification and fraud prevention solutions for the sharing economy, we use machine learning and behavioral checks to protect businesses against chargebacks and fraud | Computer and Network Security | 🇨🇦 Toronto | 12 | 2019 |
| 24 | [Megawire](https://www.tamtam.ai/c/megawire) (megawire.com)<br>Industry-leading provider of managed IT services in Southern Ontario, offering customized solutions for businesses of all sizes with a comprehensive background in networking, storage, and virtualization | IT Services and IT Consulting | 🇨🇦 Waterloo | 10 | 1998 |
| 25 | [OwlEye](https://www.tamtam.ai/c/owleye) (owleye.com)<br>A pioneer in manual secure code review services, leveraging security analysts to identify and address vulnerabilities in application source code | Computer and Network Security | 🇨🇦 Mississauga | 7 | 2023 |
| 26 | [VNK CYBER SECURITY AND INTELLIGENCE (VNK CSI)](https://www.tamtam.ai/c/vnk-cyber-security-and-intelligence-vnk-csi) (vnkcsi.com)<br>Providing SaaS-based cybersecurity solutions, we protect businesses from cyber threats, allowing them to focus on core competencies in a secure digital environment | Computer and Network Security | 🇨🇦 Burlington | 5 | 2012 |
| 27 | [SinghIT Services Inc.](https://www.tamtam.ai/c/singhit-services-inc) (singhit.ca)<br>Offering comprehensive IT solutions, including managed services, web services, IT security, and infrastructure planning and deployment, with a focus on client care | IT Services and IT Consulting | 🇨🇦 Peterborough | 3 |  |
| 28 | [Telemerge are now New Era Technology VCD, CA, Inc](https://www.tamtam.ai/c/telemerge-are-now-new-era-technology-vcd-ca-inc) (neweratech.com)<br>Global provider of managed technology solutions with expertise in collaboration, networking, security, cloud, and professional services across various industries worldwide | IT Services and IT Consulting | 🇨🇦 Markham | 2 | 1994 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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## The same list elsewhere in Canada

- [Cybersecurity companies in Canada](https://www.tamtam.ai/l/cybersecurity-companies-canada) (52)

## The same list elsewhere

- [Cybersecurity companies in the world](https://www.tamtam.ai/l/cybersecurity-companies-in-the-world) (3,776)

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Source: https://www.tamtam.ai/l/cybersecurity-companies-ontario