Insights

Strong Market Presence Whelan Security is one of the largest contract security providers in the United States with a revenue exceeding one billion dollars, indicating substantial market reach and potential for expansion into new sectors or geographic areas.

Acquisition Opportunities Having been acquired by Garda World Security Corporation, Whelan now benefits from increased resources and industry integration, presenting opportunities to offer complementary services or tailor solutions that leverage parent company relationships.

Diverse Client Base Serving hundreds of clients across various industries suggests a broad target market, enabling sales efforts to focus on diversified security needs—from commercial to industrial sectors—enhancing cross-selling opportunities.

Technology Stack Utilizing digital tools like Google Analytics and SEO indicates Whelan’s focus on digital engagement and efficiency, suggesting opportunities to introduce advanced security technologies and analytics solutions.

Growing Workforce With a large and expanding team of up to 10,000 employees, there is potential to offer employee-centered security products or services that improve workforce safety, training, and operational management.

Similar companies to Whelan Security

Whelan Security Tech Stack

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

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

Media & News

Garda World Security Corporation acquired Whelansecurity on Jan 1st '19.
Simpson Thacher represented Garda World Security Corporation, the world’s largest privately-owned security services company, in connection with Garda’s acquisition of Whelan Security, which operates security guard services in the United States.
May 12, 2019 | www.globallegalchronicle.com

Whelan Security's Email Address Formats

Whelan Security uses at least 1 format(s):

Whelan Security Email Formats	Example	Percentage
FLast@whelansecurity.com	JDoe@whelansecurity.com	95%
First.Last@whelansecurity.com	John.Doe@whelansecurity.com	4%
FirstLast@whelansecurity.com	JohnDoe@whelansecurity.com	1%

Frequently Asked Questions

Where is Whelan Security's headquarters located?

Whelan Security's main headquarters is located at 1699 South Hanley Road, Ste. 350, St. Louis, MO 63144, US. The company has employees across 4 continents, including North AmericaEuropeAsia.

What is Whelan Security's phone number?

You can contact Whelan Security's main corporate office by phone at

+1-314-644-****

. 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?

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

How much revenue does Whelan Security generate?

As of October 2025, Whelan Security's annual revenue is estimated to be $5B.

What is Whelan Security's NAICS code?

Whelan Security's NAICS code is 5616 - Investigation and Security Services.

How many employees does Whelan Security have currently?

As of October 2025, Whelan Security has approximately 5K employees across 4 continents, including North AmericaEuropeAsia. Key team members include Chief Executive Officer: K. M.Chief Financial Officer: M. M.Chief Medical Scribe: H. R.. Explore Whelan Security's employee directory with LeadIQ.

What industry does Whelan Security belong to?

Whelan Security operates in the Security and Investigations industry.

What technology does Whelan Security use?

Whelan Security's tech stack includes WordPressTwemojiGoogle Fonts APIjQueryPHPYoast SEOGoogle AnalyticsShareThis.

What is Whelan Security's email format?

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?

Whelan Security was founded in 1949.

Whelan Security

Security and InvestigationsUnited States5001-10000 Employees

Whelan’s commitment to quality and service has made us one of the foremost respected, successful and fastest growing companies in the industry. Today, we rank as one of the largest contract security companies operating in the United Sates, and serve hundreds of different clients in many diverse industries throughout the United States.

As we continue to grow, we have a consistent need for talented, assertive and positive individuals who have a friendly attitude, strong initiative, and the desire to lead in security officer jobs. If you are looking for a challenging and rewarding career in the security industry, we encourage you to take the first step towards becoming a part of the Whelan team.