List of Security and Investigations companies in New York (2026 list)

These New York-based security and investigations companies primarily offer a range of services from on-site security personnel to advanced technological solutions. Many specialize in protecting corporate facilities, critical infrastructure, and high-profile individuals. Guardsmark provides worldwide security services and investigations, while UNDSS focuses on safety and security for United Nations personnel globally. Mulligan Security supplies fire safety and security professionals for commercial buildings. MSA Security offers canine detection teams and X-ray technology to mitigate threats.

The companies listed show a strong concentration in providing comprehensive security solutions for businesses and organizations. Many of these firms, such as DGA Security, founded in 1969, and Silverseal, established in 1988, have long operational histories, indicating a mature market for security services in New York.

#	Company	Industry	Headquarters	Employees	Founded
1	Guardsmark aus.com This company provides security services, investigations, consulting, facility design, and specialized services such as executive protection and background screening worldwide	Security and Investigations	🇺🇸 New York	1,343	n/a
2	UNDSS un.org A department of the United Nations providing safety and security services globally for UN personnel, dependents, and premises	Security and Investigations	🇺🇸 New York	1,246	2005
3	Mulligan Security aus.com Provider of top security and fire safety professionals for high-rise commercial buildings and corporate facilities, part of Protos Security for advanced services	Security and Investigations	🇺🇸 New York	854	1992
4	MSA Security aus.com Provides innovative security solutions including canine detection teams and advanced X-ray technology to mitigate explosive and active shooter threats worldwide.	Security and Investigations	🇺🇸 New York	614	1987
5	Harvard Protection Services, LLC.harvardprotect.com A premier security firm offering comprehensive services including security, hospitality, and life safety personnel supported by state-of-the-art technology	Security and Investigations	🇺🇸 New York	424	1996
6	WSO Worldwide Security Options wso-security.com An international company specializing in strategic corporate security, providing innovative solutions to identify, control, and manage risks for businesses worldwide	Security and Investigations	🇺🇸 New York	272	2010
7	Security Guard Service linkedin.com This company offers executive protection and security guard services in New York and nationwide, with 24/7 dispatch capabilities for immediate response	Security and Investigations	🇺🇸 New York	265	2008
8	MG - Mulligan Security aus.com Security professionals offer expert risk assessment and crisis management plans, conduct investigative due diligence, and provide training to help corporations mitigate risks and recover from crises efficiently	Security and Investigations	🇺🇸 New York	236	2008
9	DGA Security dga.com A leading provider of business security solutions since 1969, offering intrusion alarms, video surveillance, access control, fire alarm systems, and more	Security and Investigations	🇺🇸 New York	223	1969
10	Excel Security Corporation excelsecurity.com An internationally recognized security services provider offering personnel security, investigations, training, access control, surveillance installation, and emergency response since 1992	Security and Investigations	🇺🇸 New York	199	1992
11	Silverseal silverseal.net A global security solutions firm with experienced professionals offering a wide range of services including executive protection, investigations, and special event security	Security and Investigations	🇺🇸 New York	196	1988
12	CSS Security csssecurityservices.com A security company founded in 1975, providing high-level protection for various events, corporations, and individuals with professionally trained staff	Security and Investigations	🇺🇸 New York	192	n/a
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13	ESCC escc.com A leading provider of integrated security and communications solutions for commercial properties, residential properties, and development projects for over 30 years	Security and Investigations	🇺🇸 New York	183	1985
14	Stroz Friedberg, a LevelBlue company aon.com Specialized risk management firm focusing on cybersecurity, digital forensics, incident response, eDiscovery, and due diligence to help organizations address complex challenges	Security and Investigations	🇺🇸 New York	178	2000
15	Narrow Security narrowsecurity.com This company based in New York offers Fire Guard and Security Guard Services nationwide to residential, commercial, and private clients, ensuring safety around the clock	Security and Investigations	🇺🇸 New York	172	2014
16	Private Investigator privateinvestigatorweb.com The company provides services such as background checks, due diligence reports, and investigations to help clients make informed decisions and reduce risk exposure	Security and Investigations	🇺🇸 New York	152	2000
17	Beau Dietl & Associates investigations.com Premier private investigation firm with offices across the US and global partners Specializing in thorough investigations, security, and exceptional communication	Security and Investigations	🇺🇸 New York	147	1985
18	Alliance Security US alliance.us Integrated security and technology company in NYC, providing physical security and technology solutions for businesses to create safe and secure environments	Security and Investigations	🇺🇸 New York	68	1992
19	Unity Building Security unitybuildingsecurity.com A leader in top-tier security services with specialized solutions for property managers, corporations, retailers, event organizers, and cultural institutions	Security and Investigations	🇺🇸 New York	36	1996
20	Polaris Corporate Risk Management polarisrsk.com With over 50 years of experience, Polaris excels in corporate risk management, offering Crisis Management, Investigations, Protective Services, Travel Security, and Global Intelligence solutions	Security and Investigations	🇺🇸 New York	36	n/a
21	Reliant Safety reliantsafety.com A subsidiary providing property security and management solutions for affordable housing nationwide through innovative technologies and highly-trained personnel	Security and Investigations	🇺🇸 New York	35	2009
22	DeLuca Advisory Services delucaadvisory.com Specialists in law enforcement, risk management, and compliance offering tailored solutions to protect reputation and assets for clients of all sizes	Security and Investigations	🇺🇸 New York	33	2019
23	RSAT Security Consulting rsatsecurity.com RSAT Security Consulting provides top-tier security and executive protection training and operations solutions to government and private sectors globally	Security and Investigations	🇺🇸 New York	10	n/a
24	Investigative Management Group investigativemanagement.com A leading provider of corporate security and intelligence services based in New York City, offering services to large corporations, financial institutions, law firms, and high-net-worth individuals globally	Security and Investigations	🇺🇸 New York	10	2003
25	The NY Locksmith thenylocksmith.com A NYC-based locksmith and security systems company specializing in Access Control, Surveillance, Communications, and advanced security solutions bridging the present to the future	Security and Investigations	🇺🇸 New York	3	2015

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How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 15, 2026.

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Security and Investigations companies in North America 352

List of Security and Investigations companies in New York

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