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Proven Security. Real Experiences.
Trusted Results.

At Protos, we strive to deliver measurable impact and unmatched service. From Fortune 500 companies to local businesses, our clients count on us for consistent, responsive and professional security services. Check out the reviews below to discover how we’ve delivered peace of mind and operational excellence to clients across North America.

trustpilot
Protos is always very professional and easy to work with. We truly value our partnership with them.
trustpilot
Vigilance Protection Services, LLC has had a very positive experience working in partnership with Protos Security. Their team has been professional, responsive, and organized throughout the vendor onboarding and service coordination process. Protos provides clear communication, detailed post expectations, and a structured platform that allows security providers to properly manage assignments, reporting, and client expectations.

As a private security agency, we value partnerships that are built on accountability, professionalism, and mutual respect. Protos Security has demonstrated those qualities by working with us to ensure service requirements are clearly communicated and that both the client and vendor are supported properly.

We appreciate the opportunity to partner with Protos Security and look forward to continuing a strong working relationship. I would recommend Protos to security vendors and clients looking for a company that values communication, structure, and reliable service delivery.
trustpilot
Protos Security has giving us time to build ourselves. Great opportunities to expand small businesses and expedite professional performance for various clients. Thanks Protos Security.
trustpilot
The representative was professional
trustpilot
Has helped out my company tremendously. I hope we can keep on working together to build stronger relationships.
trustpilot
Protos is an absolute pleasure to work with, the rates are good and the work is consistent. Also, the work orders themselves are thorough and provide the information we typically need.

If I were to make a suggestion it would be for the dispatchers to call while also sending an email whenever new jobs are available. This way we will know right away and have the information we need to send over to other managers/supervisors.
trustpilot
Protos is an amazing platform for small security companies. I have worked with Protos for four years, and I have always been treated with care and respect. They truly make you feel like you belong. Their team is always accessible, supportive, and helpful whenever needed.

The vendor portal has greatly improved punch report management, especially by resolving lost revenue issues caused by missed or incorrect punches. Overall, Protos has created a smoother and more reliable experience for security vendors.
trustpilot
Experience with Protos has been great. Very professional company tjat cares about their vendors.
trustpilot
Outstanding partners, great service.
trustpilot
Great expectation
We are very happy with Protos Services
trustpilot
they are so professional helpful and understanding

they pay on time with trust
trustpilot
Was very helpful and thoughtful for calling late at night, but we appreciate it
trustpilot
Protos is a great security business always providing professional security services and solutions
trustpilot
Protos Security has been a reliable and professional partner in managing our security needs. Their team consistently demonstrates strong communication, responsiveness, and attention to detail, which makes coordinating coverage seamless—even on short notice.

One of the standout aspects of working with Protos is their ability to quickly source qualified personnel while maintaining high standards. Their vendor management system is efficient, and their support team is always available to address any concerns or adjustments in a timely manner.

Overall, Protos delivers a dependable service with a clear commitment to quality and partnership. We appreciate their dedication and would recommend them to any organization looking for a well-structured and responsive security vendor.
trustpilot
Protos tailors his service to each client to meet their standard needs. Protos will spend thousands of dollars and high-end human resources to educate their vendor network so that clients receive the best.
This is how Care Protos is for the type of service provided.

trustpilot
The clock in and out system is great and accurate

Showing our 4 & 5 star reviews

Protos
Headquarters

383 Main Ave, Suite 505
Norwalk, CT 06851, USA
Phone: 203.941.4700

Protos
Headquarters

383 Main Ave, Suite 505
Norwalk, CT 06851, USA
Phone: 203.941.4700

Mark Hjelle

Chief Executive Officer

Mark Hjelle is the CEO of Security Services Holdings, LLC as well as Protos Security and its subsidiaries. Mark is an experienced Chief Executive Officer and Board Member who has led large national business and facilities services firms for nearly 25 years delivering strong top- and bottom-line growth while building high-performing teams with strong culture. Most recently, he was CEO for CSC ServiceWorks, a B2B2C provider of technology-enabled consumer services. Prior to CSC, Mark was President of Brickman/Valleycrest a national provider of exterior landscape and snow removal services. Over the course of his 18-year tenure at Brickman, he held numerous leadership positions in operations, finance and business development. Mark holds a Bachelor of Science degree in Economics from The Wharton School of Business, University of Pennsylvania, a Master of Government Administration from the University of Pennsylvania Fels Institute of Government and a Law Degree from Case Western Reserve School of Law.