Insights

Acquisition traction Whelan Security was acquired by Garda World Security Corporation in early 2019, indicating potential alignment with large enterprise buyers and access to expanded resources, which may influence procurement cycles and preferred vendor criteria.

Scale and reach With 1001-5000 employees and being one of the largest contract security providers in the United States, Whelan demonstrates substantial field coverage and capability to manage multi-site, enterprise-level security programs for diverse industries.

Financial potential Reported revenue in the range of 250M to 500M suggests consistent mid-to-large scale contract opportunities and an established, service-ready platform likely capable of handling high-value security services and long-term SLAs.

Tech and digital The adoption of web and analytics tools (WordPress, Google Analytics, Yoast SEO, jQuery, PHP) indicates a modern online presence and data-driven approach that can be leveraged for digital outreach, client onboarding, and performance tracking in sales efforts.

Market positioning Being among the fastest-growing and most respected U.S. contract security firms, with experience serving hundreds of clients across diverse industries, positions Whelan as a credible candidate for RFPs, new market entries, and enterprise security program expansion.

Similar companies to Whelan Security

Whelan Security Tech Stack

Whelan Security uses 8 technology products and services including WordPress, Google Fonts API, Twemoji, and more. Explore Whelan Security's tech stack below.

  • Content Management System
  • Google Fonts API
    Font Scripts
  • Twemoji
    Font Scripts
  • jQuery
    Javascript Libraries
  • PHP
    Programming Languages
  • Yoast SEO
    Search Engines
  • Google Analytics
    Web Analytics
  • ShareThis
    Widgets

Whelan Security's Email Address Formats

Whelan Security uses at least 3 email formats:
Whelan Security Email FormatsExamplePercentage
FLast@whelansecurity.comJDoe@whelansecurity.com
95%
First.Last@whelansecurity.comJohn.Doe@whelansecurity.com
4%
FirstLast@whelansecurity.comJohnDoe@whelansecurity.com
1%

Frequently Asked Questions

What is Whelan Security's phone number?

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You can contact Whelan Security's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Whelan Security's official website and social media links?

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Whelan Security's official website is whelansecurity.com and has social profiles on LinkedIn.

How much revenue does Whelan Security generate?

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As of August 2026, Whelan Security's annual revenue is estimated to be $250M - $500M.

What is Whelan Security's SIC code and NAICS code?

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Whelan Security's SIC code is 7381 - Detective, Guard, and Armored Car Services and NAICS code is 5616 - Investigation and Security Services.

How many employees does Whelan Security have currently?

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As of August 2026, Whelan Security has approximately 3.2K employees across 4 continents, including North America, Europe and Asia. Key team members include Chief Executive Officer: K. M., Chief Financial Officer: M. M. and Owner: G. B. Explore Whelan Security's employee directory with LeadIQ.

What industry does Whelan Security belong to?

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Whelan Security operates in the Security and Investigations industry.

What technology does Whelan Security use?

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Whelan Security's tech stack includes WordPress, Google Fonts API, Twemoji, jQuery, PHP, Yoast SEO, Google Analytics and ShareThis.

What is Whelan Security's email format?

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Whelan Security's email format typically follows the pattern of FLast@whelansecurity.com. Find more Whelan Security email formats with LeadIQ.

When was Whelan Security founded?

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Whelan Security was founded in 1949.
Whelan Security logo

Whelan Security

Security and InvestigationsMissouri, United States1001-5000 Employees

Whelan Security is a security and investigations company headquartered at 1699 South Hanley Road, Suite 350, St. Louis, Missouri 63144, United States. It is one of the largest contract security providers in the United States and serves hundreds of clients across diverse industries nationwide. The company employs between 1,001 and 5,000 people and maintains a website at https://whelansecurity.com. In January 2019, Garda World Security Corporation acquired Whelan Security. Reported revenue falls within a range of $250 million to $500 million.

Section iconCompany Overview

Phone number
SIC Code
7381 - Detective, Guard, and Armored Car Services
NAICS Code
5616 - Investigation and Security Services
Founded
1949
Employees
1001-5000

Section iconFunding & Financials

  • $250M - $500M

    Whelan Security's revenue is estimated to be in the range of $250M - $500M

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