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Products & Services
About Gmsc
Complete security services for buildings and tenants. Successful security programs rely on these key factors. Gmsc is a company reporting $25M-$50M in annual revenue, classified under Investigation and Security Services, based in Chicago, Illinois, United States, operating in Office service and employing 501-1,000 people.
Its primary NAICS classification is 561612 (Security Guards and Patrol Services). Gmsc is one of 508,039 Industrial & mechanical companies listed in Illinois.
Business Contact Information
- Phone
- +1 (312) 5277721
- Website
- www.gmscsecurity.com
- facebook.com/gmscsecure
- Address
- 222 Merchandise Mart Plz, Chicago, Illinois, 60654, United States
Industry & Classification
- Industry
- Industrial & mechanical
- Sector
- Commercial services
- Segment
- Office service
NAICS Codes
- 56Administrative and Support and Waste Management and Remediation Services
- 5616Investigation and Security Services
- 561612Security Guards and Patrol Services
SIC Codes
- 73Business Services
- 738Miscellaneous Business Services
- 7381Investigation Services
Company Details
- Employees
- 908 (501-1,000)
- Annual Revenue
- $49.9M ($25M-$50M)
Gmsc: frequently asked questions
What does Gmsc do?
Complete security services for buildings and tenants. Successful security programs rely on these key factors.
Where is Gmsc located?
Gmsc is headquartered at 222 Merchandise Mart Plz, Chicago, Illinois, 60654, United States.
How many employees does Gmsc have?
Gmsc has about 908 employees (the 501-1,000 range).
What is Gmsc's annual revenue?
Gmsc's annual revenue is estimated at $49.9M (the $25M-$50M range).
What industry is Gmsc in?
Gmsc is in the Industrial & mechanical / Commercial services industry, and its primary NAICS code is 561612 (Security Guards and Patrol Services).
How can I contact Gmsc?
Its website is www.gmscsecurity.com and its phone number is +1 (312) 5277721.
Largest companies in Illinois
Largest industrial & mechanical companies
Manufacturing sales in Illinois, 2026
In Illinois, Factur's 2026 study counted 74 manufacturing quotes worth $11.8M and 14 purchase orders over 12 months: 19% of quotes became orders, against 21% nationally. See the Illinois data.
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