Cybersecurity companies in Connecticut span an array of services to protect online information. From risk management to network monitoring and data security, these businesses operate in an ever-evolving digital landscape. The industry encompasses firms providing IT consulting, data protection, vulnerability assessments and managed security services. With threats of cyber attacks on a rise, the industry is seeing a surge in innovation to stay ahead. These companies not only contribute to security best practices but are guiding the future of internet safety, securing the digital assets of businesses of all sizes.


Top 23 cybersecurity companies in Connecticut

1. SDG Corporation: IT Security and Risk Management Solutions

  • Website: sdgc.com
  • Headquarters: Norwalk, Connecticut, United States
  • Founded: 1993
  • Headcount: 201-500
  • Latest funding type: Series Unknown
  • LinkedIn

SDG Corporation is a global cybersecurity, identity governance, risk consulting, and advisory firm. They specialize in advising and partnering with clients to address complex security, compliance, and technology needs. SDG delivers on strategy, transformation, and long-term management of cybersecurity and identity and access management (IAM) programs.


2. CompassMSP

  • Website: compassmsp.com
  • Headquarters: West Hartford, Connecticut, United States
  • Founded: 2016
  • Headcount: 201-500
  • LinkedIn

CompassMSP is a leading IT services company that offers comprehensive network monitoring, data backup & recovery, managed IT support, cybersecurity, IT consulting, compliance services, and business cloud solutions. They provide 24/7 network monitoring services to detect and address security threats immediately, ensuring their clients' networks remain secure. With a dedicated team of experts, CompassMSP delivers reliable and efficient IT solutions to businesses of all sizes.


3. Atlantic Data Security, LLC

Atlantic Data Security is a premier cybersecurity solutions provider that offers managed security services (MSS) and support to organizations. They specialize in vulnerability assessments, penetration testing, and perimeter security to protect against cyber threats. Their in-house certified engineers provide comprehensive security courses and training. With a focus on cloud and virtualized security, network security, and data security, they offer a complete spectrum of cybersecurity essentials.


4. ADNET Technologies

  • Website: thinkadnet.com
  • Headquarters: Rocky Hil, Connecticut, United States
  • Founded: 1991
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

ADNET Technologies is an IT management and cybersecurity firm that provides industry-leading services in Managed IT Services, Cloud, and Cybersecurity. With offices in Connecticut and New York, they offer a human-centered approach to client engagements. ADNET Technologies is recognized regionally as one of the Best Places to Work and ranks nationally and globally among top MSPs.


5. Charles IT

  • Website: charlesit.com
  • Headquarters: Middletown, Connecticut, United States
  • Founded: 2006
  • Headcount: 51-200
  • LinkedIn

Charles IT is a technology company providing proactive IT support, unlimited IT support, and vCISO support. They offer IT solutions to meet specific needs, including endpoint encryption, managed VoIP phones, and security information & event management. Their services cater to non-profits, businesses in various industries, and organizations with highly regulated technology. They prioritize IT compliance, specializing in HIPAA, CMMC, DFARS, 800-171, and SOC2. Charles IT aims to build real relationships with clients and ensure their satisfaction.


6. Razberi by ComNet

  • Website: razberi.net
  • Headquarters: Danbury, Connecticut, United States
  • Founded: 2011
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

Razberi.net is a company that provides simple and secure physical security solutions. They offer a software platform called Razberi Monitor™ that allows for centralized video surveillance and provides a top-down view of the physical security network without the need for IT resources. Their purpose-built line of servers, Razberi Core™, supports video management, recording, and analytics for centralized video deployments. With their EndpointDefender™ product, loaded with CameraDefense™ and ApplianceDefense™, they also offer impenetrable cybersecurity protection for IP cameras and other IoT devices.


7. NSI (New England Systems, Inc.)

  • Website: nsiserv.com
  • Headquarters: Naugatuck, Connecticut, United States
  • Founded: 1985
  • Headcount: 51-200
  • LinkedIn

NSI is a company providing IT support and cyber security services to firms and non-profits in Connecticut. They offer total IT solutions and specialize in protecting organizations from cyber threats. With a focus on constant monitoring and education, NSI helps reduce cyber risk and clarify confusing topics in the field of cyber security.


8. Vancord

  • Website: vancord.com
  • Headquarters: Milford, Connecticut, United States
  • Founded: 2018
  • Headcount: 11-50
  • LinkedIn

Vancord is a company that specializes in optimizing organizational performance through the implementation and management of customized network solutions. They offer cybersecurity services such as vulnerability assessments, penetration testing, and dark web monitoring. Additionally, they provide project services, incident response, and event automation.


9. BluSapphire Cyber Systems

  • Website: blusapphire.com
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 2014
  • Headcount: 11-50
  • Latest funding type: Series A
  • LinkedIn

BluSapphire is a cybersecurity company that offers a comprehensive solution for incident lifecycle management across organizations. Their advanced threat detection and response platform helps businesses proactively detect and remediate cyber threats, minimizing downtime and cost of remediation. They provide both cloud-based and on-premise solutions, catering to various industries, including BFSI, education, manufacturing, and more.


10. OutSecure Inc

  • Website: outsecure.com
  • Headquarters: Shelton, Connecticut, United States
  • Founded: 2000
  • Headcount: 11-50
  • LinkedIn

OutSecure is a company that offers cybersecurity services to help organizations protect their digital assets.


11. Hi-Link

Hi-Link Technology Group is an IT solution company that offers complete IT solutions for businesses. Their services include data center solutions, network design and virtualization, unified collaboration, cloud services, backup and disaster recovery, and cyber security. They also offer consulting services and focus on industries such as education, healthcare, local and state government, and small to medium businesses.


12. Core Networks, Inc.

Core Networks Inc., Inc. is a Systems Integrator providing intelligent system solutions for businesses. We are a small business located in Glastonbury, Connecticut, with over 12 years of experience in cutting edge technology solutions. We currently have a broad customer base throughout Connecticut and parts of Massachusetts and we employ highly skilled systems engineers maintaining certifications in the most widely utilized hardware and software in the industry.


13. The TNS Group

  • Website: thetnsgroup.com
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 1996
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

The TNS Group is a leading Managed Service Provider (MSP) offering reliable and flexible IT solutions to small and medium businesses. With a client-centric approach, TNS delivers top-tier partnerships, world-class technical expertise, and growth-oriented business models to help businesses outperform their competition. They provide managed IT services, data security, cloud managed services, and IT consulting to ensure businesses' operations are protected and optimized.


14. Connecticut Information Security, LLC

  • Website: ctinfosec.com
  • Headquarters: Wilton, Connecticut, United States
  • Founded: 2007
  • Headcount: 1-10
  • LinkedIn

Connecticut Information Security is a full-service cyber security firm specializing in protecting networks, aligning organizations with security standards and educating technology professionals on security-related topics and tools. At Connecticut Information Security, we are dedicated to proactively protecting the security of agencies and businesses and creating action plans to mitigate existing security risks. Our in-depth knowledge of cyber security threats, remediation techniques and governance make us the obvious solution when tackling your most important security needs. Our experiences range the full breadth of security development from tactical to strategic and technical to procedural. Our offerings include vulnerability assessments, network penetration testing, web application testing, strategic security guidance, policy review, research, training and more. Our goal at Connecticut Information Security is to provide your agency with a personal touch and a quality of service well beyond your expectations. Our unfaltering discipline ensures that you stay on track and your reputation stays in-tact.


15. Euclid Security

We help companies defend against cyber attacks & people advance their career in Cybersecurity. Since 2017, Euclid Security has been providing a wide range of Cybersecurity services to help companies stay. We have also been providing cybersecurity training to help students and employees get a career or advance their knowledge in Cybersecurity. Contact us today for free consultation.


16. Cymonix

  • Website: cymonix.com
  • Headquarters: Hartford, Connecticut, United States
  • Founded: 2021
  • Headcount: 1-10
  • LinkedIn

Cymonix is a full-service information security management company that protects sensitive, confidential business information from unauthorized access, disclosure, distribution and destruction.


17. Commprise

  • Website: commprise.com
  • Headquarters: Hartford, Connecticut, United States
  • Founded: 2010
  • Headcount: 11-50
  • LinkedIn

Commprise is a Managed Service Provider (MSP) based in Hartford, Connecticut that offers customized IT services to clients. They provide a comprehensive IT solution that supports and secures data, applications, and employees.


18. Circulent

  • Website: circulent.com
  • Headquarters: Darien, Connecticut, United States
  • Founded: 2003
  • Headcount: 11-50
  • LinkedIn

Circulent is an IT service provider offering managed services, cloud solutions, cyber security, VoIP, and printing services to businesses. They partner with clients to provide continuous, all-encompassing IT support.


19. Network Design Services, LLC

  • Website: ndstech.com
  • Headquarters: Woodbury, Connecticut, United States
  • Founded: 1993
  • Headcount: 11-50
  • LinkedIn

Network Design Services, LLC offers IT services and solutions for businesses, including virtualization, cloud computing, data backup, network design, and IT support. They aim to help companies save money and time while providing expert support to maintain peak operation in their IT network.


20. Total Communications

  • Website: totalcomm.com
  • Headquarters: East Hartford, Connecticut, United States
  • Founded: 1980
  • Headcount: 51-200
  • LinkedIn

Total Communications is a technology-focused company that offers custom solutions for business needs. They provide a range of services including collaboration, telephony, networking, business continuity, data centers, security, and structured cabling. With a team of highly trained experts and strategic partnerships with leading technology organizations, Total Communications is dedicated to maximizing performance and minimizing downtime. They offer end-to-end project management and tailored service agreements to meet the unique requirements of each organization.


21. JED Consulting Services

  • Website: jedcissp.com
  • Headquarters: Niantic, Connecticut, United States
  • Headcount: 1-10

JED Consulting Services LLC is a company that operates in the Management Consulting industry. It employs 6-10 people and has $0M-$1M of revenue. The company is headquartered in Niantic, Connecticut.


22. Shoreline East BNI

We offer top of the line stand alone PBX systems as well as VoIP solutions. We back all of our products with a full year warranty and provide service contracts with an outstanding value. Our technicians are all factory trained and state licensed. We install low voltage cabling for data networks, telephone systems and paging systems. Stevens Communications, Inc. has been serving the Connecticut business community since 1983. For over 28 years, we have been helping local businesses grow and prosper. In today's ever-changing telecom world, it's important to know your vendor has a long and stable track record. Stevens Communications is a full service telecommunications company, specializing in installing and servicing digital, hybrid, and Pure IP business telephone and voice mail systems. We carry systems from 4 phones to over 300. We carry only top name brands and offer very competitive prices. We also carry a full line of ancillary telephone system equipment including headsets, commercial / music on hold systems and much more.


23. Apex Technology Services

Apex Technology Services is a technology company that offers IT support, advisory, and consulting services. They specialize in cybersecurity, data centers, cloud services, and web design/development. With expertise in IT planning and project management, they provide businesses with solutions to streamline operations and enhance security.


Want to find more cybersecurity companies?


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