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
One of the features that stands out to us is Protos' 24-hour dispatch capability, with the ability to speak with a live dispatcher at any time. This gives us reassurance and provides quick resolution to issues as they arise. We also like the mobile app, which allows the guards to clock in and out and track the guard's location in real time.
trustpilot
I have had a really good experiences with the people at Protos. I started working as a vendor with them middle of 2025. It has been slow in terms of work orders but the ones I received were fair in pricing. The dispatchers are easy to talk with. The Vendor relations manager is very accessible. I am hoping for a better relationship this year.
trustpilot
Professional, respectful, and Diversity,
trustpilot
Great security guards and excellent service!
trustpilot
Good communication with the management, clear instructions,
Sometimes difficulties with the dispatchers.
trustpilot
Everting about the company is the best
trustpilot
Protos is the best. No question about it.
trustpilot
Protos Security consistently demonstrates a high level of professionalism through their responsiveness, clear communication, and transparency. Their team is accountable, dependable, and proactive in addressing concerns and fulfilling commitments. Protos Security has proven to be a reliable partner with a strong dedication to service excellence.
trustpilot
Everybody’s very polite
trustpilot
Protos Security is a top-notch security company. Mike Hjelle, the man in charge, is focused, dedicated, and experienced. Very professional, friendly and welcoming at the same time. All the entire Protos Management Team, thumbs up. Better organization that manages their clients/vendors with care, giving you an opportunity to grow with them.
trustpilot
PROTOS always provides us with quality work and pays on time. Protos cares about finding local quality vendors for their clients, and treat those vendors well. Whether you are a company needing security services, or a security company needing to expand your workforce, protos will help!
trustpilot
Great communication and willingness to assist. I feel integrated into a large team that shares the same goal of client satisfaction.
trustpilot
Protos is doing everything well in our assessment but for charging us 3% on our invoices that are paid on 15 days net, even for temporary sites. It doesn't feel right to assign your vendor to complete a job for a few days or weeks and still hold payment for 30days. And when we request 15 days payment, you charge us 3% of that same lean invoice. We are aware that you bill your clients before even accepting such contract.
trustpilot
Every time I talk to my account managers by phone.They help me out with all my problems that I might be having.And they give me the solutions that I need to resolve these issues that my guards and I might have
trustpilot
My experience with Protos has been ok, but the one thing about Protos that concerns me if the method of how they distribute the work to security companies like myself. Its been times that i haven't had jobs in a month or two and found out that many jobs have been given out to other companies as if my company was over looked and the dispatchers showing favoritism to other security companies.'
trustpilot
International security Guard services been served more than 10 years with A great experience with Protos, the service are very exceptional and ISGS we approximately approved the best security services often comes from their more you welcome and very proactive, technology-driven approach, strong communication, and dedicated account management, providing clients with a modern, flexible, and accountable security solution through their proprietary platform and network of vetted security vendors. Reviewers highlight features like real-time reporting, timely responses, local expertise, and a focus on building strong, almost "family-like" relationships with clients and partners, making them feel supported and well-understood.

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.