| Paragon Systems Inc. | Herndon | VA | $3.15B |
| Triple Canopy Inc. | Herndon | VA | $2.52B |
| MVM, Inc. | Ashburn | VA | $2.32B |
| Metropolitan Security Services, Inc. | Chattanooga | TN | $2.24B |
| Centerra Group, LLC | Herndon | VA | $1.44B |
| Sallyport Global Holdings Inc. | Reston | VA | $1.18B |
| Gardaworld Federal Services LLC | Arlington | VA | $1.15B |
| Inter-con Security Systems, Inc. | Pasadena | CA | $1.04B |
| Universal Protection Service, Limited Partnership | Conshohocken | PA | $913M |
| Covenant Aviation Security, LLC | Naperville | IL | $848M |
| Chenega Global Protection, LLC | Chantilly | VA | $738M |
| Pond Security Service GMBH | Erlensee | | $711M |
| Soc LLC | Reston | VA | $546M |
| G4S Secure Integration LLC | Omaha | NE | $518M |
| Akima Infrastructure Protection LLC | Herndon | VA | $493M |
| Kerberos International, Inc. | Temple | TX | $465M |
| First Coast Security Solutions, Inc. | Jacksonville | FL | $437M |
| Vendtech-sgi LLC | Wichita | KS | $434M |
| G4S Secure Solutions (usa) Inc. | Jupiter | FL | $355M |
| Diversified Protection Corp. | Daniel Island | SC | $343M |
| Golden SVCS, LLC | Kingston | TN | $320M |
| Acuity - Janus Global, LLC | Reston | VA | $297M |
| Bradley Technologies Inc. | Rockville | MD | $291M |
| Iss Action Inc. | Punta Gorda | FL | $277M |
| Trailboss Enterprises, Inc. | Anchorage | AK | $235M |
| Adc Ltd. Nm | Albuquerque | NM | $213M |
| Michael Stapleton Associates, Ltd. | New York | NY | $205M |
| Koniag Professional Services, LLC | Anchorage | AK | $202M |
| North American Security, Incorporated | Edmond | OK | $199M |
| Cda Incorporated | Conshohocken | PA | $185M |
| Securitas Critical Infrastructure Services, Inc. | Herndon | VA | $161M |
| Continuity Global Solutions LLC | Port Saint Joe | FL | $155M |
| The Whitestone Group, Inc. | Reynoldsburg | OH | $150M |
| Kr-mtac LLC | Hagerstown | MD | $141M |
| Simmons & Golden Security LLC | Maryville | TN | $139M |
| Kr Contracting Inc. | Mclean | VA | $136M |
| American Eagle Protective Services Corp. | Leander | TX | $134M |
| Spectrum Security Services, Inc. | Jamul | CA | $127M |
| Patronus Systems Inc. | Melbourne | FL | $126M |
| American Security Programs Inc. | Irvine | CA | $125M |
| S1S Alpha LLC | Ashton | MD | $124M |
| Omniplex World Services Corporation | Herndon | VA | $116M |
| Master Security Company LLC | Cockeysville | MD | $116M |
| Culpepper & Associates Security Services Inc. | Atlanta | GA | $112M |
| Excalibur Associates Inc. | Ellijay | GA | $110M |
| United Security Inc. | Red Bank | NJ | $107M |
| I3 Pathfinder USA LLC | Falls Church | VA | $94.7M |
| Cogar Group, Ltd. The | Aldie | VA | $92.8M |
| Alutiiq Advanced Security Solutions LLC | Anchorage | AK | $88M |
| Alante Security Group, Inc. | Westbury | NY | $87.4M |
| Joeun System Corp. | Seoul | | $82.1M |
| Surveillance Security, Inc. | Gilbert | AZ | $80.8M |
| Ahtna Professional Services, Inc. | Anchorage | AK | $77.9M |
| Trinity Technology Group, Inc. | Mclean | VA | $75.5M |
| Servexo | Gardena | CA | $73.1M |
| Vision Quest Solutions Inc. | Hot Springs | SD | $69.1M |
| Asset Protection & Security Services, L.P. | Corpus Christi | TX | $67.9M |
| Global Resource Solutions Inc. | Mclean | VA | $66.8M |
| Prosecure, LLC | Titusville | FL | $65.1M |
| Sicuritalia - Securitas Critical Infrastructure Services Inc. JV | Westlake Village | CA | $60.8M |
| Redcon Solutions Group LLC | Port Charlotte | FL | $59.5M |
| Prudential Protective Services LLC | Monroe | MI | $59.5M |
| Defense Contracting Activity, LLC | Chantilly | VA | $55.4M |
| Linxx Global Solutions, LLC | Virginia Beach | VA | $54.9M |
| Nv Securitas Securitas Critical Infrastructure Services Soc. | Brussel | | $53.5M |
| C.i.v.i.s. Centro Italiano Di Vigilanza Interna E Stradale S.p.a. | Milano | MI | $53M |
| Praetorian Standard, Inc. | Fayetteville | NC | $52.9M |
| American-paragon Protective Services LLC | Leander | TX | $51.2M |
| G4S India JV | Jupiter | FL | $50.8M |
| Excelsior Defense, Inc. | Saint Petersburg | FL | $49.8M |
| Global Security Management Agency, Inc. | Antioch | CA | $49.5M |
| North Texas Investors Group, Inc. | Fort Worth | TX | $49M |
| G4S France JV | Jupiter | FL | $47.5M |
| Gardaworld Federal Nigeria | Arlington | VA | $46.9M |
| Protection Unit | Saint-georges-sur-meuse | | $46M |
| Strategic Security Corp. | Smithtown | NY | $45.6M |
| Elliott Security Solutions LLC | Harvey | LA | $45.6M |
| Universal Protection Service, LLC | Conshohocken | PA | $44.6M |
| Pinnacle Protection Partners, LLC | Titusville | FL | $44.4M |
| MSS Security Pty Limited | Parramatta | NSW | $43.1M |
| Sos Security LLC | Irvine | CA | $42.4M |
| Putz Security Ag | Kaltenkirchen | | $41.3M |
| Securemedy Inc. | Fort Washington | MD | $40.9M |
| Akima Centerra Integrated Services LLC | Herndon | VA | $40.7M |
| Aegis-kk Security | Arlington | VA | $39.3M |
| Inner-parish Security, Corp. | Hammond | LA | $38.9M |
| Johnson Security Bureau, Inc. | Bronx | NY | $38.8M |
| Security Alliance LLC | Doral | FL | $37.5M |
| Apsi-centerra JV, LLC | Anchorage | AK | $36.8M |
| G4S Secure Solutions International Inc. | Jupiter | FL | $35.3M |
| Torres-avarn Security LLC | Falls Church | VA | $34.2M |
| FJC Security Services Inc. | Long Island City | NY | $32.9M |
| Agma Security Service Inc. | Hormigueros | PR | $31.7M |
| Starside Security & Investigation Inc. | Diamond Bar | CA | $31.5M |
| Academi Training Center LLC | Moyock | NC | $31.2M |
| Explosive Countermeasures International Inc. | Delaplane | VA | $30.8M |
| Athena Services International LLC | Bethesda | MD | $29.8M |
| G4S Evik JV | Jupiter | FL | $28.3M |
| Westmoreland Protection Agency, Inc. | Sunrise | FL | $28.2M |
| HBC Management Services, Inc. | Honolulu | HI | $25.6M |
