Cybersecurity defense companies form a critical line of defense in today’s digital age, where threats evolve rapidly. This industry comprises firms that protect sensitive data and infrastructure from cyber attacks through various solutions—encompassing threat detection, incident response, and managed security services. The prevalence of cyber risk is leading companies toward adopting advanced technologies such as artificial intelligence and cloud security frameworks. Future trends suggest increased demand for specialized services focused on compliance and risk management as businesses aim to secure their operations in an increasingly interconnected world. Innovation is becoming essential as cyber adversaries grow more sophisticated.

This list highlights 21 key cybersecurity defense companies, showcasing a mix of sizes and founding years. Most firms range from small entities with fewer than 200 employees to large-scale operations exceeding 10,000. Many are headquartered in strategic locations such as the United States and Europe, emphasizing their global influence. These companies specialize in various services, including threat intelligence, managed security, and incident response, adapting quickly to evolving market demands, particularly in sectors like healthcare and finance, where security needs are acute. Their ongoing innovation plays a crucial role in shaping the cybersecurity field.

Continue reading to explore the top cybersecurity defense companies.

Top 21 Cybersecurity Defense Companies

1. Mandiant Security Validation

• Website: fireeye.com
• Ownership type: Private Equity
• Headquarters: Mclean, Virginia, United States (USA)
• Latest funding: $1.2B, June 2021
• Founded year: 2014
• Headcount: 51-200
• LinkedIn: secvalidation

Mandiant Security Validation, part of FireEye, is a cybersecurity firm based in McLean, Virginia. Founded in 2014, the company has carved out a niche in providing a range of security solutions that include threat intelligence, incident response, and managed defense services. Mandiant's clientele primarily consists of businesses in sectors such as healthcare and finance, which are often targets for cyber threats. The firm is recognized for its expertise in security validation, helping organizations assess and improve their security posture. With a significant funding round of $1.2 billion in June 2021, Mandiant continues to enhance its capabilities and expand its reach in the cybersecurity market, making it a relevant player in the industry.

2. ManTech

• Website: mantech.com
• Ownership type: Private Equity
• Headquarters: Herndon, Virginia, United States (USA)
• Employee distribution: United States (USA) 92%, Germany 2%, Other 6%
• Latest funding: $4.2B, May 2022
• Founded year: 1968
• Headcount: 5001-10000
• LinkedIn: mantech

ManTech International Corporation, founded in 1968 and based in Herndon, Virginia, is a private equity-owned defense contractor that specializes in providing advanced technology solutions and services primarily to U.S. government agencies. With a workforce of over 10,000 employees, ManTech operates across various sectors, including defense, intelligence, and federal civilian services. The company is particularly noted for its cybersecurity capabilities, offering services that range from secure mission and enterprise IT to digital transformation consulting. ManTech has been involved in significant projects, such as supporting the Department of Veterans Affairs and providing continuous diagnostics and mitigation for federal civilian agencies. The company has also received substantial funding, with a reported amount of $4.2 billion in May 2022, which underscores its strong position in the market and its ongoing commitment to addressing complex national security challenges.

3. Optiv

• Website: optiv.com
• Ownership type: Private Equity
• Headquarters: Denver, Colorado, United States (USA)
• Employee distribution: United States (USA) 63%, India 33%, Canada 4%
• Latest funding: Other (Debt), May 2023
• Founded year: 2015
• Headcount: 1001-5000
• LinkedIn: optiv-inc

Optiv Security, Inc., founded in 2015 and based in Denver, Colorado, is a cybersecurity consulting firm that specializes in providing a broad range of information security services and solutions. With a workforce of over 2,300 employees, Optiv serves clients across multiple sectors, helping them navigate the complexities of cyber risks, compliance requirements, and security enhancements. Their offerings include advanced detection and response, application security, cloud security, and managed services, among others. Optiv collaborates with more than 450 technology partners, ensuring they can deliver tailored solutions that meet the unique needs of their clients. The firm has established a reputation for its strategic approach to cybersecurity, focusing on building resilience and optimizing security investments for organizations. They have also been active in promoting cybersecurity awareness and education, further solidifying their role in the industry.

4. SecureTech LLC

• Website: securetech.ae
• Ownership type: Private
• Headquarters: Abu Dhabi, Abu Dhabi, United Arab Emirates (UAE)
• Employee distribution: United Arab Emirates 100%
• Founded year: 2000
• Headcount: 501-1000
• LinkedIn: securetech-llc

SecureTech LLC, founded in 2000 by Dr. Abdulla Al Nuaimi, is a prominent security solutions provider based in Abu Dhabi, UAE. The company specializes in ICT and security solutions tailored for various sectors, including government, healthcare, finance, and oil and gas. With a workforce of around 600 qualified professionals, SecureTech offers a comprehensive suite of services that includes IT infrastructure, cybersecurity, and consultancy. Their cybersecurity offerings cover critical areas such as incident response, network security, and digital surveillance, addressing the growing need for robust security measures in an increasingly digital world. SecureTech has built a reputation for delivering innovative and cost-effective solutions, positioning itself as a trusted partner for organizations seeking to enhance their security posture.

5. Cybereason

• Website: cybereason.com
• Ownership type: Private Equity
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: Israel 33%, Japan 26%, United States (USA) 16%, Other 26%
• Latest funding: Series E-K, $120.0M, March 2025
• Founded year: 2012
• Headcount: 1001-5000
• LinkedIn: cybereason

Cybereason, headquartered in San Diego, California, is a cybersecurity firm that specializes in advanced software solutions aimed at threat detection and incident response. Since its inception in 2012, the company has focused on enhancing security postures for businesses across various sectors. The Cybereason Defense Platform is central to their offerings, providing tools for preventing, detecting, and responding to cyber attacks. The platform integrates multiple layers of security, including endpoint protection, threat intelligence, and managed detection and response services. Cybereason has a global presence, with a significant portion of its workforce located in Israel and Japan, reflecting its international reach. The company has attracted considerable investment, with a recent funding round of $120 million, underscoring its growth potential and commitment to innovation in the cybersecurity space.

6. InfoGuard AG

• Website: infoguard.ch
• Ownership type: Private
• Headquarters: Baar, Zug, Switzerland
• Employee distribution: Switzerland 95%, Austria 4%
• Founded year: 2001
• Headcount: 201-500
• LinkedIn: infoguard-ag

InfoGuard AG, based in Baar, Zug, Switzerland, is a private cybersecurity firm founded in 2001. With a workforce of approximately 237 employees, the company specializes in a comprehensive suite of security services tailored to protect businesses from cyber threats. Their offerings include cyber defense services, incident response, cloud security, and security consulting. InfoGuard operates a Cyber Defence Center in Switzerland, which is ISO 27001 certified, showcasing their commitment to maintaining high security standards. The company serves a variety of industries, providing managed services and expert consulting to help organizations safeguard their digital assets. InfoGuard has also received recognition in the form of awards from industry analysts, further solidifying its position in the cybersecurity sector.

7. Vectra AI

• Website: vectra.ai
• Ownership type: Private Equity
• Headquarters: San Jose, California, United States (USA)
• Employee distribution: United States (USA) 50%, Ireland 18%, Germany 4%, Other 28%
• Latest funding: Series E-K, $130.0M, April 2021
• Founded year: 2011
• Headcount: 501-1000
• LinkedIn: vectra_ai

Vectra AI, Inc., founded in 2011 and based in San Jose, California, is a cybersecurity firm that specializes in artificial intelligence-driven solutions for hybrid attack detection, investigation, and response. The company operates globally, providing advanced security measures tailored to various industries, including banking, healthcare, and government. Vectra AI's platform focuses on identifying and mitigating sophisticated cyber threats, utilizing real-time attack signal intelligence to enhance the capabilities of security operations centers (SOCs). With a workforce of approximately 647 employees, Vectra AI has established itself as a significant player in the cybersecurity field, recognized for its innovative approach and extensive research in AI security. The company has also secured substantial funding, with a recent Series E-K round raising $130 million in April 2021, reflecting strong investor interest in its technology and market potential.

8. TechGuard Security

• Website: techguard.com
• Ownership type: Private
• Headquarters: O'Fallon, Illinois, United States (USA)
• Employee distribution: United States (USA) 86%, Australia 8%, India 3%, Other 3%
• Founded year: 2000
• Headcount: 51-200
• LinkedIn: techguard-security

TechGuard Security, based in O'Fallon, Illinois, is a cybersecurity firm that has been operational since 2000. The company specializes in providing a wide array of cybersecurity solutions, including risk management, security awareness training, and compliance consulting. TechGuard's clientele includes government agencies and businesses, reflecting their ability to cater to both public and private sectors. The firm is recognized for its commitment to protecting critical infrastructure and has developed proprietary solutions like DEFEND360™, which integrates proactive threat prevention with robust defense measures. TechGuard has also been involved in national defense initiatives, contributing to the security of U.S. critical infrastructure. With a team of experienced professionals, the company emphasizes a holistic approach to cybersecurity, ensuring that people, processes, and technology align with best practices. TechGuard has filed for numerous patents, showcasing its focus on innovation and research in the cybersecurity field.

9. Nuspire

• Website: nuspire.com
• Ownership type: Private Equity
• Headquarters: Commerce Charter Township, Michigan, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: November 2016
• Founded year: 1999
• Headcount: 201-500
• LinkedIn: nuspire

Nuspire, founded in 1999 and based in Commerce Charter Township, Michigan, is a managed security services provider specializing in cybersecurity solutions. With a workforce of approximately 163 employees, Nuspire has built a reputation for its comprehensive offerings, which include managed detection and response, endpoint protection, and cybersecurity consulting. The company serves a wide array of industries, such as manufacturing, healthcare, finance, and retail, providing tailored security measures to address the unique challenges faced by each sector. Nuspire emphasizes a people-first approach, leveraging its extensive expertise to enhance clients' security postures. Their services are designed not just to react to threats but to anticipate and mitigate them proactively, ensuring that clients can navigate the complexities of cybersecurity with confidence.

10. Help AG, an e& enterprise company

• Website: helpag.com
• Ownership type: Corporate
• Headquarters: Dubai, Dubai, United Arab Emirates (UAE)
• Employee distribution: United Arab Emirates 83%, Saudi Arabia 17%
• Latest funding: February 2020
• Founded year: 2005
• Headcount: 501-1000
• LinkedIn: help-ag

Help AG, an e& enterprise company, is a cybersecurity firm based in Dubai, UAE, founded in 2005. The company specializes in providing a wide range of cybersecurity services tailored for businesses and organizations that require robust protection against evolving cyber threats. Their portfolio includes consulting services, CISO advisory, digital forensics, and managed security services, which are critical for organizations navigating the complexities of digital security. Help AG also offers next-generation platforms such as DDoS mitigation and security service edge solutions. With a workforce of approximately 546 employees, the company primarily operates in the UAE and Saudi Arabia, focusing on enhancing digital security for its clients. Help AG has positioned itself as a key player in the cybersecurity sector within the Middle East, addressing the growing demand for advanced security solutions.

11. Cqr

• Website: cybercx.com.au
• Ownership type: Private Equity
• Headquarters: Picardy, Hauts-De-France, France
• Employee distribution: Ukraine 50%, Australia 50%
• Latest funding: January 2022
• Founded year: 2004
• Headcount: 51-200
• LinkedIn: cqr

Cqr, known as CyberCX, is a cybersecurity firm based in Picardy, Hauts-De-France, France, with a significant presence in Australia and Ukraine. Founded in 2004, the company has grown to employ around 63 professionals, reflecting a robust operational capacity. CyberCX specializes in a wide array of cybersecurity services, including penetration testing, incident response, and cloud security solutions. They cater to both business and government sectors, focusing on managing cyber risks and enhancing security postures. Their approach emphasizes building resilience and ensuring compliance in an increasingly complex threat environment. CyberCX also invests in education and training through the CyberCX Academy, aiming to develop the next generation of cybersecurity professionals. This commitment to skill development and proactive threat management underscores their active role in the cybersecurity industry.

12. Fortified Health Security

• Website: fortifiedhealthsecurity.com
• Ownership type: Private Equity
• Headquarters: Brentwood, Tennessee, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: December 2022
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: fortified-health-security

Fortified Health Security, based in Brentwood, Tennessee, is a cybersecurity firm that specializes in protecting healthcare organizations from cyber threats. Founded in 2009, the company has built a reputation for providing tailored cybersecurity solutions that address the specific challenges faced by hospitals, health systems, and healthcare technology companies. Their services include Virtual Chief Information Security Officer (vCISO) offerings, incident response, and security risk assessments, all designed to safeguard patient data and manage cybersecurity risks effectively. Fortified Health Security emphasizes a partnership approach, working closely with clients to enhance their cybersecurity posture and resilience. The firm has received recognition for its innovative programs and has been involved in various industry initiatives, contributing to the broader conversation on healthcare cybersecurity. With a dedicated team of experts, Fortified Health Security continues to play a vital role in the ongoing battle against cyber threats in the healthcare sector.

13. Bishop Fox

• Website: bishopfox.com
• Ownership type: Private Equity
• Headquarters: Tempe, Arizona, United States (USA)
• Employee distribution: United States (USA) 74%, Mexico 17%, Other 9%
• Latest funding: Series B, $46.0M, November 2022
• Founded year: 2005
• Headcount: 201-500
• LinkedIn: bishop-fox

Bishop Fox, founded in 2005 and based in Tempe, Arizona, is a cybersecurity firm that specializes in offensive security services. With a workforce of approximately 386 employees, the company focuses on helping businesses, particularly in the technology sector, enhance their security posture against cyber threats. Their offerings include penetration testing, attack surface management, and various assessments tailored to meet the unique needs of their clients. Bishop Fox has been recognized for its innovative approach, particularly through its Cosmos platform, which provides continuous offensive security solutions. The firm has also received significant funding, with a Series B round totaling $46 million in November 2022, indicating strong investor confidence in their business model and growth potential. Their commitment to proactive defense strategies and collaboration with industry giants underscores their relevance and impact in the cybersecurity sector.

14. Acalvio Technologies

• Website: acalvio.com
• Ownership type: Venture Capital
• Headquarters: Santa Clara, California, United States (USA)
• Employee distribution: India 54%, United States (USA) 37%, Germany 2%, Other 7%
• Latest funding: Series D, $17.4M, July 2022
• Founded year: 2015
• Headcount: 51-200
• LinkedIn: acalvio-technologies

Acalvio Technologies, founded in 2015 and based in Santa Clara, California, is a cybersecurity firm that focuses on advanced threat detection and identity protection solutions. The company serves a wide array of clients, including midsize businesses, Fortune 500 companies, and government agencies. Acalvio's product offerings include the Acalvio Active Defense Platform and ShadowPlex solutions, which leverage cyber deception technology to enhance security measures. Their approach is particularly effective in early threat detection, identity threat detection and response, and protection against insider threats. Acalvio has received significant venture capital funding, with their latest round totaling $17.4 million in July 2022, reflecting strong investor interest in their innovative solutions. The company is also recognized for its contributions to the cybersecurity field, having developed over 25 patents related to autonomous deception technology, which positions them as a notable player in the industry.

15. CyberKnight

• Website: cyberknight.tech
• Ownership type: Corporate
• Headquarters: Dubai, Dubai, United Arab Emirates (UAE)
• Employee distribution: United Arab Emirates 56%, Saudi Arabia 22%, Egypt 12%, Other 10%
• Latest funding: March 2023
• Founded year: 2020
• Headcount: 51-200
• LinkedIn: cyberknighttech

CyberKnight Technologies is a cybersecurity-focused value-added distributor based in Dubai, UAE, founded in 2020. The company specializes in Zero Trust Security solutions, catering to both enterprise and government clients. CyberKnight aims to enhance breach detection and incident response through a comprehensive suite of cybersecurity services. With a strong presence in the Middle East, they leverage strategic partnerships to deliver innovative security solutions. Their approach emphasizes the importance of addressing regulatory compliance and managing cyber threats effectively. CyberKnight's team consists of industry veterans with extensive experience, allowing them to provide specialized consultancy and advisory services. They are actively involved in the cybersecurity community, participating in regional events and expanding their market reach. Their commitment to empowering partners and customers through education and support is a key aspect of their operational philosophy.

16. S2grupo

• Website: s2grupo.es
• Ownership type: Private
• Headquarters: Valencia, Valencian Community, Spain
• Employee distribution: Spain 91%, Colombia 7%, Other 2%
• Latest funding: Other (Grant), $63,000, October 2014
• Founded year: 1999
• Headcount: 501-1000
• LinkedIn: s2-grupo

S2 Grupo, based in Valencia, Spain, is a cybersecurity firm founded in 1999. With a workforce of approximately 678 employees, the company has established itself as a significant player in the cybersecurity sector. S2 Grupo specializes in various areas, including threat detection, incident management, and advanced security audits. They cater to a wide range of clients, from private enterprises to public institutions, ensuring the protection of critical systems and compliance with security regulations. The company operates in over 35 countries and has a strong presence in Spain and Latin America. S2 Grupo is known for its proprietary technology and has invested heavily in research and development, participating in numerous projects to enhance cybersecurity solutions. Their initiatives also include community engagement to promote cybersecurity awareness, particularly among vulnerable groups. This multifaceted approach positions S2 Grupo as a relevant and active entity in the cybersecurity industry.

17. Adlumin

• Website: adlumin.com
• Ownership type: Corporate
• Headquarters: Washington, D.C., District Of Columbia, United States (USA)
• Employee distribution: United States (USA) 86%, Philippines 12%, Australia 3%
• Latest funding: $100.0M, November 2024
• Founded year: 2016
• Headcount: 51-200
• LinkedIn: adlumin-inc.

Adlumin, based in Washington, D.C., is a cybersecurity company founded in 2016. It specializes in providing a Security Operations Platform that integrates various security services, including Extended Detection and Response (XDR) and Managed Detection and Response (MDR). The company serves a wide range of industries, such as finance, healthcare, and government, helping organizations enhance their security posture against evolving cyber threats. Adlumin operates on a Software as a Service (SaaS) model, allowing for seamless integration with existing technology infrastructures. With a workforce of approximately 119 employees, the company has gained traction in the cybersecurity market, analyzing over 300 billion security events monthly. Their recent funding of $100 million in November 2024 underscores their growth trajectory and commitment to innovation in cybersecurity solutions.

18. Kudelski Security

• Website: kudelskisecurity.com
• Ownership type: Private
• Headquarters: Cheseaux-Sur-Lausanne, Vaud, Switzerland
• Employee distribution: Switzerland 42%, United States (USA) 29%, Spain 13%, Other 17%
• Founded year: 2012
• Headcount: 201-500
• LinkedIn: kudelski-security

Kudelski Security, based in Cheseaux-Sur-Lausanne, Switzerland, is a cybersecurity firm that specializes in providing a wide range of services aimed at enhancing the security posture of its clients. Established in 2012, the company has grown to employ around 430 professionals across various locations, including significant presences in the United States, Spain, and India. Kudelski Security offers services such as advisory, managed security, and incident response, focusing on sectors like finance, healthcare, and manufacturing. Their approach is characterized by a commitment to delivering customized security solutions that address the unique challenges faced by their clients. The company has also been recognized for its innovative managed detection and response services, receiving accolades from industry analysts and organizations. This recognition underscores their expertise and effectiveness in the cybersecurity domain, further solidifying their position as a relevant player in the industry.

19. CyberProof

• Website: cyberproof.com
• Ownership type: Corporate
• Headquarters: Aliso Viejo, California, United States (USA)
• Employee distribution: India 63%, Israel 14%, Spain 13%, Other 11%
• Latest funding: January 2018
• Founded year: 2017
• Headcount: 501-1000
• LinkedIn: cyberproof-inc.

CyberProof, founded in 2017 and based in Aliso Viejo, California, is a cybersecurity firm that specializes in providing a range of security services tailored to meet the needs of businesses across various sectors. With a workforce of around 416 employees, the company focuses on Managed Detection & Response, threat intelligence, and penetration testing. CyberProof serves clients in industries such as Automotive, Banking, Financial Services, and Healthcare, helping them enhance their security measures against evolving cyber threats. The company operates globally, with a significant portion of its workforce located in India, Israel, and Spain. CyberProof has not reported any recent funding, indicating a self-sustaining business model. Their strategic partnerships with technology giants like Microsoft and Google further strengthen their service offerings, particularly in areas like AI-driven threat detection and cloud security solutions.

20. LRQA Nettitude

• Website: nettitude.com
• Ownership type: Corporate
• Headquarters: Birmingham, England, United Kingdom (UK)
• Latest funding: March 2018
• Founded year: 2003
• Headcount: 201-500
• LinkedIn: nettitude-group

LRQA Nettitude, founded in 2003 and based in Birmingham, England, is a cybersecurity provider that specializes in a wide array of services aimed at enhancing the security posture of organizations. The company offers penetration testing, managed security services, and compliance solutions, catering to clients across multiple sectors such as financial services, healthcare, and technology. With a workforce of approximately 243 employees, LRQA Nettitude has established a global presence, with offices in key locations including the United States, Singapore, and Spain. Their approach emphasizes tailored cybersecurity solutions to meet the specific needs of their clients, reflecting their commitment to addressing the dynamic nature of cyber threats. The company has not reported any recent funding, indicating a stable operational model since its inception.

21. TRIVAD, Inc.

• Website: trivad.com
• Ownership type: Private
• Headquarters: Burlingame, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2001
• Headcount: 51-200
• LinkedIn: trivad-inc.

TRIVAD, Inc., based in Burlingame, California, is a private IT solutions provider founded in 2001. The company specializes in cybersecurity and defense services, catering primarily to global organizations and federal agencies. With a workforce of 51-200 employees, TRIVAD has built a reputation for delivering innovative solutions that address the intricate needs of its clients. Their offerings include infrastructure management, disaster recovery, compliance preparation, and a strong emphasis on cybersecurity. TRIVAD has received multiple certifications, including AS9100 Rev D and ISO9001, which underscore their commitment to quality and compliance. The company collaborates with over 4,000 vendor partners to provide a wide array of hardware, software, and complex solutions, ensuring that they can meet the evolving challenges in the IT and cybersecurity sectors. Their extensive experience and focus on customer service have earned them recognition in the industry, making them a trusted partner for organizations seeking to enhance their security posture.

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