Security consulting companies in the US focus on safeguarding enterprises by assessing risks, developing strategies, and implementing comprehensive security measures. These firms range from specialized boutique agencies to large corporate entities, offering services such as cyber risk assessment, compliance consulting, crisis management, and technology integration. As organizations increasingly face cyber threats, the industry's trajectory is leaning toward innovative solutions that combine technology with human expertise. Moreover, prioritizing employee training and awareness has become crucial, signaling a shift from mere protection to proactive engagement, without losing sight of traditional physical security solutions. It's an evolving field imperative to modern business continuity.


This list features 16 prominent security consulting companies in the US, varying significantly in size, specialization, and operational scope. Starting from founding years as early as 1957 to as recent as 2015, these firms operate from major cities such as New York, Denver, and California. While some employ over 10,000 individuals, others have more specialized teams of up to 200 employees. The companies shown offer an array of services ranging from cybersecurity measures and compliance consulting to risk assessments and training, specifically adapting their services to meet the unique needs of various industries including healthcare, finance, and technology.


Read on to discover more about the top security consulting companies in the US.


Top 16 Security Consulting Companies in the US


1. Allied Universal

  • Website: aus.com
  • Ownership type: Corporate
  • Headquarters: Irvine, California, United States (USA)
  • Employee distribution: United States (USA) 94%, Canada 4%, Other 2%
  • Latest funding: $721.0M, December 2019
  • Founded year: 1957
  • Headcount: 10001+
  • LinkedIn: allied-universal

Allied Universal, based in Irvine, California, is a prominent security services company founded in 1957. With a workforce exceeding 90,000 employees, the company provides a comprehensive range of security solutions tailored to meet the specific needs of its clients. Their services include security personnel, technology integration, and professional services, which are designed to enhance safety and compliance across various sectors. Allied Universal serves a broad client base, including businesses and government entities, and has developed specialized programs for industries such as healthcare, education, and corporate environments. The company has also made significant strides in technology, incorporating advanced systems like HELIAUS® AI Security to improve their service delivery. In 2019, Allied Universal secured substantial funding, further solidifying its position in the market. Their commitment to risk management and their extensive experience in the field make them a noteworthy player in the security consulting industry.


2. 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., based in Denver, Colorado, is a cybersecurity consulting firm that specializes in providing a broad range of information security services and solutions. Established in 2015, Optiv has grown to employ over 2,300 professionals, with a significant portion of its workforce located in the United States, India, and Canada. The company serves clients across various industries, helping them navigate the complexities of cyber risks, compliance requirements, and security enhancements. Optiv's service offerings include advanced detection and response, identity modernization, risk management, and managed services, among others. Their approach is centered on delivering customized solutions that align with clients' specific business needs, ensuring they can effectively manage and mitigate cyber threats. Optiv's commitment to cybersecurity is further demonstrated through their extensive partnerships with technology vendors, which allows them to provide clients with a comprehensive suite of tools and services designed to bolster their security posture.


3. 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 critical security solutions, including threat intelligence, incident response, and managed defense services. Mandiant's expertise is particularly sought after in industries such as healthcare and finance, where compliance and protection against cyber threats are paramount. The firm has gained recognition for its proactive approach to security, helping organizations validate their security measures and respond effectively to incidents. With a significant funding round of $1.2 billion in June 2021, Mandiant demonstrates strong backing and a commitment to enhancing its offerings in the cybersecurity consulting market.


4. Guidepost Solutions

  • Website: guidepostsolutions.com
  • Ownership type: Private
  • Headquarters: New York, New York, United States (USA)
  • Employee distribution: United States (USA) 87%, Colombia 6%, United Kingdom (UK) 3%, Other 3%
  • Founded year: 2010
  • Headcount: 201-500
  • LinkedIn: guidepost-solutions

Guidepost Solutions, founded in 2010 and based in New York City, is a consulting firm that specializes in investigations, compliance solutions, and security consulting. With a workforce of approximately 263 employees, the company serves a variety of clients, including businesses and government entities. Their expertise spans several areas, such as corporate internal investigations, cybersecurity consulting, and risk management. Guidepost Solutions has developed a reputation for addressing complex challenges related to operational integrity and compliance. They have also engaged in monitorships, providing oversight and guidance to organizations in need of compliance frameworks. Their commitment to security is evident in their tailored solutions for sectors like education, healthcare, and critical infrastructure, showcasing their adaptability and industry knowledge.


5. DSI Security Services

  • Website: dsisecurity.com
  • Ownership type: Family Owned
  • Headquarters: Dothan, Alabama, United States (USA)
  • Employee distribution: United States (USA) 99%
  • Founded year: 1969
  • Headcount: 1001-5000
  • LinkedIn: dsi-security-services

DSI Security Services, established in 1969, is a family-owned security service provider based in Dothan, Alabama. With a workforce of approximately 1,386 employees, the company specializes in uniformed security, technology solutions, and consulting services tailored to various industries. DSI has expanded its operations to 28 offices across 33 states, reflecting its growth and commitment to quality service. The company emphasizes reliability and has a history of providing customized security assessments to mitigate risks for its clients. DSI has also been recognized for its excellence in the industry, recently winning the Outstanding Security Performance Award, which underscores its dedication to high standards in security service delivery.


6. CyberSecOp - Cyber Security Operations Consulting

  • Website: cybersecop.com
  • Ownership type: Private
  • Headquarters: Stamford, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2008
  • Headcount: 51-200
  • LinkedIn: cybersecop

CyberSecOp - Cyber Security Operations Consulting, based in Stamford, Connecticut, is a private cybersecurity consulting firm founded in 2008. With a workforce of approximately 51-200 employees, the company specializes in a comprehensive range of cybersecurity services, including incident response, risk management, compliance consulting, and managed security services. CyberSecOp caters to various sectors, notably financial services and healthcare, helping organizations enhance their cybersecurity measures and ensure compliance with regulatory standards. The firm is recognized for its tailored approach, adapting its services to meet the unique needs of each client. CyberSecOp has also been acknowledged for its expertise, being ranked among the top cybersecurity consulting firms by Gartner Peer Insights. This recognition underscores their commitment to providing effective cybersecurity solutions and their active role in the industry.


7. 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, founded in 2000 and based in O'Fallon, Illinois, is a cybersecurity firm that specializes in comprehensive cybersecurity solutions. The company focuses on risk management, compliance consulting, and security awareness training, catering to a wide range of clients, including government agencies and private businesses. TechGuard has built a reputation for its innovative approach to cybersecurity, offering services like DEFEND360™, which integrates proactive threat prevention with robust defense measures. The firm has been involved in significant national defense initiatives and has a history of working with various federal agencies, including the Department of Defense and the Department of Homeland Security. TechGuard is also recognized for its commitment to training and educating organizations about cybersecurity risks, empowering employees to act as a first line of defense against potential threats. With a workforce of around 93 employees, TechGuard continues to adapt to the evolving cybersecurity landscape, ensuring that their clients are well-equipped to handle the challenges posed by cyber threats.


8. MSA Security

  • Website: msasecurity.net
  • Ownership type: Corporate
  • Headquarters: New York, New York, United States (USA)
  • Latest funding: September 2021
  • Founded year: 1987
  • Headcount: 501-1000
  • LinkedIn: msa-security

MSA Security, founded in 1987 and based in New York City, is a prominent player in the security services industry. The company specializes in K9 security, risk consulting, and emergency response, providing tailored solutions to meet the unique needs of various sectors. In 2021, MSA Security was acquired by Allied Universal, which significantly enhanced its capabilities and reach. This acquisition positioned MSA as a key component of the largest private-sector canine security company in the world. MSA Security's team comprises experts with backgrounds in law enforcement and military, ensuring a high level of service and expertise in threat mitigation and risk management. Their offerings include canine detection services, executive protection, and comprehensive risk assessments, making them a trusted partner for organizations seeking to enhance their security posture.


9. Northeast Security Inc.

  • Website: nesecurity.com
  • Ownership type: Private
  • Headquarters: Westwood, Massachusetts, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1967
  • Headcount: 1001-5000
  • LinkedIn: northeast-security-inc

Northeast Security Inc., based in Westwood, Massachusetts, has been a prominent player in the security services industry since its inception in 1967. Founded by a retired FBI agent, the company has grown to provide a wide array of security solutions, including contract security, intelligence, and technology services. They cater to various sectors, such as commercial properties, educational institutions, healthcare facilities, and more. Northeast Security prides itself on its 'Clients First' approach, ensuring that each client's unique security needs are met with tailored solutions. The company operates a 24/7 Command Center, enhancing its ability to respond to emergencies swiftly. Their team comprises professionals with backgrounds in law enforcement, military, and private security, ensuring a high level of expertise. Northeast Security is also actively involved in community initiatives and industry organizations, reinforcing its commitment to service excellence and community engagement.


10. Security Management International, LLC


Security Management International, LLC (SMI) is a security consulting firm based in Vienna, Virginia, founded in 2010. With a team of 11 to 50 employees, SMI focuses on providing security assessments, crisis management, and training services. They are particularly known for their expertise in the CARVER methodology, a strategic approach to vulnerability assessment used by the CIA and military operations. SMI offers a range of services including emergency response planning, investigations, and customized training programs. They have served clients across 43 countries and have worked with 27 Fortune 500 companies, showcasing their capability to operate on a global scale. The firm is also involved in producing educational content, such as podcasts and white papers, to contribute to the security community. Their commitment to continuous improvement and adaptation to current security challenges positions them as a relevant player in the security consulting industry.


11. Aujas Cybersecurity

  • Website: aujas.com
  • Ownership type: Corporate
  • Headquarters: Cupertino, California, United States (USA)
  • Employee distribution: India 90%, Saudi Arabia 6%, United States (USA) 3%, Other 1%
  • Latest funding: March 2019
  • Founded year: 2008
  • Headcount: 1001-5000
  • LinkedIn: aujas-networks-pvt-ltd

Aujas Cybersecurity, founded in 2008 and based in Cupertino, California, is a cybersecurity firm that provides comprehensive security solutions tailored for businesses and organizations. With a workforce of over 1,000 employees, the company operates primarily in India, with additional presence in Saudi Arabia and the United States. Aujas specializes in various cybersecurity services, including Identity and Access Management, Managed Detection and Response, and Cybersecurity Risk Advisory. Their offerings are designed to help clients manage cyber risks, ensure compliance with regulations, and protect sensitive data. Aujas has successfully completed thousands of projects, serving a wide range of industries. Their innovative approach includes robotics-driven solutions and a focus on integrating security processes, which positions them as a proactive player in the cybersecurity consulting field.


12. Alomra

  • Website: alomragroup.com
  • Ownership type: Private
  • Headquarters: United States (USA)
  • Employee distribution: Morocco 100%
  • Founded year: 2004
  • Headcount: 5001-10000
  • LinkedIn: alomra-international

Alomra Group International, founded in 2004, is a security consultancy and defense solutions provider based in Morocco. The company specializes in a variety of services, including audit and consulting, engineering and integrated technology, manned security, cyber security, fire safety, and strategic intelligence. Alomra has developed a strong reputation for its comprehensive approach to security risk management, catering to both private and public sector clients. With a significant presence in Europe, Africa, and the Middle East, Alomra has established itself as a key player in the security consulting industry. The company has also created specialized departments to address specific security needs, such as cyber defense and strategic intelligence, further enhancing its service offerings. Alomra's commitment to training and support in security management reflects its dedication to providing effective solutions tailored to client requirements.


13. IOActive, Inc.

  • Website: ioactive.com
  • Ownership type: Private
  • Headquarters: Seattle, Washington, United States (USA)
  • Employee distribution: United States (USA) 53%, United Kingdom (UK) 25%, Spain 17%, Other 4%
  • Founded year: 1998
  • Headcount: 51-200
  • LinkedIn: ioactive-inc

IOActive, Inc. is a cybersecurity firm based in Seattle, Washington, founded in 1998. With a workforce of approximately 143 employees, the company specializes in providing comprehensive security services tailored to various industries, including critical infrastructure, energy, financial services, healthcare, and technology. Their offerings include full stack security assessments, secure development lifecycle services, red and purple team services, and training programs aimed at enhancing clients' cybersecurity resilience. IOActive is recognized for its innovative approach, having pioneered the vehicle cybersecurity market through its research on connected vehicles. The firm operates globally, with a significant presence in the United States, the United Kingdom, and Spain, and has established a reputation for its high client retention rate, which exceeds 90%. This reflects their commitment to delivering effective security solutions and adapting to the evolving threat landscape.


14. AT-RISK International, Inc.


AT-RISK International, Inc. is a security consulting firm based in Reston, Virginia, founded in 2003. The company specializes in providing a comprehensive suite of services aimed at enhancing safety and mitigating security risks for clients across various sectors. Their offerings include protection, investigations, consulting, intelligence, and training services. With a team of experts boasting over 80 years of combined experience in law enforcement, national security, and corporate security, AT-RISK tailors its services to meet the specific needs of its clients. The firm operates a Global Risk Intelligence Center that continuously monitors potential threats worldwide, allowing them to deliver timely and effective threat mitigation strategies. Their client base spans multiple industries, including healthcare, finance, media, and education, reflecting their adaptability and expertise in addressing unique security challenges. AT-RISK has established partnerships with various professional organizations, enhancing their credibility and access to industry best practices. They have not reported any funding, indicating a self-sustained operational model.


15. 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 that specializes in cybersecurity solutions. The company offers a comprehensive range of services, including managed detection and response, endpoint protection, and cybersecurity consulting. Nuspire serves clients across various sectors, such as manufacturing, healthcare, finance, and retail, tailoring their security measures to address the unique challenges faced by each industry. With a workforce of approximately 163 employees, Nuspire emphasizes a people-first approach, leveraging over 25 years of expertise to enhance clients' security postures. Their commitment to client satisfaction is reflected in their high retention rates and the proactive nature of their services, which include incident readiness, threat modeling, and digital forensics. Nuspire has not reported any recent funding, indicating a stable operational model since their last funding round in 2016.


16. Chesley Brown International

  • Website: chesleybrown.com
  • Ownership type: Private
  • Headquarters: Smyrna, Georgia, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1990
  • Headcount: 1001-5000
  • LinkedIn: chesley-brown-international

Chesley Brown International, based in Smyrna, Georgia, is a security consulting firm that has been active since 1990. The company specializes in risk management and corporate investigations, providing a wide array of services designed to help businesses safeguard their assets and navigate potential crises. Their offerings include comprehensive risk assessments, security training, physical security audits, and technical surveillance countermeasures. With a focus on various sectors such as healthcare, education, and corporate environments, Chesley Brown tailors its solutions to meet the unique needs of its clients. The firm prides itself on its experienced team, which includes professionals from law enforcement and corporate security backgrounds. This expertise allows them to deliver effective strategies that not only protect but also enable business growth. Chesley Brown International has built a reputation for reliability and adaptability in the face of evolving security challenges.



Security Consulting Insights: Key Companies in the US


CompanyHeadquarterSizeFoundedOwnership
Allied UniversalIrvine, California, United States (USA)10001+1957Corporate
OptivDenver, Colorado, United States (USA)1001-50002015Private Equity
Mandiant Security ValidationMclean, Virginia, United States (USA)51-2002014Private Equity
Guidepost SolutionsNew York, New York, United States (USA)201-5002010Private
DSI Security ServicesDothan, Alabama, United States (USA)1001-50001969Family Owned
CyberSecOp - Cyber Security Operations ConsultingStamford, Connecticut, United States (USA)51-2002008Private
TechGuard SecurityO'Fallon, Illinois, United States (USA)51-2002000Private
MSA SecurityNew York, New York, United States (USA)501-10001987Corporate
Northeast Security Inc.Westwood, Massachusetts, United States (USA)1001-50001967Private
Security Management International, LLCVienna, Virginia, United States (USA)11-502010Private
Aujas CybersecurityCupertino, California, United States (USA)1001-50002008Corporate
AlomraUnited States (USA)5001-100002004Private
IOActive, Inc.Seattle, Washington, United States (USA)51-2001998Private
AT-RISK International, Inc.Reston, Virginia, United States (USA)51-2002003Private
NuspireCommerce Charter Township, Michigan, United States (USA)201-5001999Private Equity
Chesley Brown InternationalSmyrna, Georgia, United States (USA)1001-50001990Private


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