| Prosegur prosegur.com | Ansonville, 🇺🇸 United States | 60.1K | $14631.3M | - | - | 7% |
| GardaWorld garda.com | Montreal, 🇨🇦 Canada | 22.1K | $5498.7M | - | - | 26% |
| Kroll kroll.com | New York, 🇺🇸 United States | 7.2K | $1752.9M | 740K/mo | - | 7% |
| SSI securityservicesinternational.co.uk | 🇬🇧 United Kingdom | 2.9K | $710.1M | - | - | -38% |
| HSS hss-us.com | Denver, 🇺🇸 United States | 2.8K | $688.2M | - | - | 10% |
| Pronet pronet.com.tr | İstanbul, 🇹🇷 Turkey | 2.6K | $645.5M | - | - | 9% |
| Pinkerton pinkerton.com | Ann Arbor, 🇺🇸 United States | 2.2K | $542.7M | - | - | 8% |
| Gunnebo gunnebo.com | - | 1.8K | $436.8M | - | - | 9% |
| Spdc securityproductsdistributioncenter.com | Corpus Christi, 🇺🇸 United States | 1.5K | $362.2M | - | - | -5% |
| GARDA gardaseguridad.com | 🇺🇸 United States | 1.4K | $333.0M | - | - | -14% |
| Wackenhut wackenhut.com | Palm Beach Gardens, 🇺🇸 United States | 1.2K | $282.8M | - | - | 6% |
| SecurAmerica securamericallc.com | Atlanta, 🇺🇸 United States | 867 | $211.2M | - | - | -5% |
| SecuriGroup securigroup.co.uk | Glasgow, 🇬🇧 United Kingdom | 858 | $209.0M | - | - | 10% |
| Axitea axitea.it | - | 758 | $184.6M | - | - | 1% |
| SECUREcorp securecorp.com.au | Mulgrave, 🇦🇺 Australia | 706 | $172.0M | - | - | 12% |
| ACADEMI academi.com | Moyock, 🇺🇸 United States | 654 | $142.2M | - | - | 7% |
| Jumio jumio.com | Palo Alto, 🇺🇸 United States | 653 | $252.7M | - | $205.4M | -11% |
| Ambrey ambrey.com | 🇬🇧 United Kingdom | 567 | $123.3M | - | - | -1% |
| Securens securens.in | - | 546 | $118.8M | - | - | 5% |
| PELCO pelco.com | Fresno, 🇺🇸 United States | 535 | $116.4M | - | - | -4% |
| Kaba kaba.com | Gilroy, 🇺🇸 United States | 489 | $106.4M | - | - | - |
| W hscstltd.wixsite.com | 🇳🇿 New Zealand | 474 | $103.1M | - | - | - |
| Sunzu ecademy.com | - | 470 | $102.2M | - | - | 16% |
| Brivo brivo.com | Bethesda, 🇺🇸 United States | 431 | $93.7M | - | - | -7% |
| S-RM s-rminform.com | London, 🇬🇧 United Kingdom | 397 | $86.3M | - | - | -3% |
| Sonitrol sonitrol.com | Trophy Club, 🇺🇸 United States | 389 | $84.6M | - | - | 1% |
| Traka traka.com | Olney, 🇬🇧 United Kingdom | 361 | $78.5M | - | - | 26% |
| SecTek sectek.com | Reston, 🇺🇸 United States | 358 | $77.9M | - | - | 14% |
| PhoneWatch phonewatch.ie | 🇮🇪 Ireland | 358 | $77.9M | - | - | 5% |
| Sibylline sibylline.co.uk | London, 🇬🇧 United Kingdom | 356 | $77.4M | - | - | 33% |
| Paxton paxton.co.uk | Brighton and Hove, 🇬🇧 United Kingdom | 332 | $72.2M | - | - | 14% |
| TriCorps tricorps.com | Oklahoma City, 🇺🇸 United States | 307 | $66.8M | - | - | 20% |
| Genric genric.com | London, 🇺🇸 United States | 280 | $53.6M | - | - | 19% |
| U.S.SECURITY u-s-security.com | Las Vegas, 🇺🇸 United States | 275 | $57.4M | - | - | 304% |
| INORIX inorix.fr | Bordeaux, 🇫🇷 France | 270 | $51.7M | - | - | 30% |
| VIVOTEK vivotek.com | San Jose, 🇺🇸 United States | 261 | $50.0M | - | - | - |
| iVIS ivisaustralia.com.au | Botany, 🇦🇺 Australia | 258 | $49.4M | - | - | 27% |
| Segurma segurma.com | Loiu, 🇪🇸 Spain | 243 | $46.5M | - | - | 34% |
| AxxonSoft axxonsoft.com | San Jose, 🇺🇸 United States | 238 | $45.6M | - | - | 2% |
| Segurtec segurtec.pt | Guimarães, 🇵🇹 Portugal | 237 | $45.4M | - | - | 24% |
| ERSC ersecurityconsulting.com | 🇺🇸 United States | 227 | $43.4M | - | - | -1% |
| Frasco frasco.com | Burbank, 🇺🇸 United States | 225 | $43.1M | - | - | - |
| Eris eris-di.com | - | 215 | $41.2M | - | - | 16% |
| BouWatch bouwatch.nl | Assen, 🇳🇱 Netherlands | 203 | $38.9M | - | - | 11% |
| Citiguard citiguardinc.com | Woodland Hills, 🇺🇸 United States | 203 | $38.9M | - | - | 25% |
| Pointer pointer.co.uk | Glasgow, 🇬🇧 United Kingdom | 202 | $38.7M | - | - | 5% |
| SWATA swata.us | ST. Petersburg, 🇺🇸 United States | 201 | $38.5M | - | - | 27% |
| ESCC escc.com | New York, 🇺🇸 United States | 198 | $37.9M | - | - | 19% |
| CyberSapiens cybersapiens.co | Bangalore, 🇮🇳 India | 197 | $20.6M | - | - | 34% |
| IdentiSys identisys.com | Eden Prairie, 🇺🇸 United States | 197 | $37.7M | - | - | - |
| DECO deco-inc.com | Champlin, 🇺🇸 United States | 183 | $35.0M | - | - | -4% |
| Sapio sapio.com.au | West Ryde, 🇦🇺 Australia | 174 | $33.3M | - | - | 43% |
| Qvis/Adata qvisglobal.com | Havant, 🇬🇧 United Kingdom | 172 | $32.9M | - | - | - |
| Autoclear a-clear.com | Farifield, 🇺🇸 United States | 167 | $32.0M | - | - | 0% |
| SafeTeam safeteam.se | Hazard, 🇺🇸 United States | 164 | $31.4M | - | - | 11% |
| Verifact verifact.com.au | Allambie Heights, 🇦🇺 Australia | 162 | $31.0M | - | - | - |
| QCIC qcic-group.com | London, 🇬🇧 United Kingdom | 159 | $30.4M | - | - | 28% |
| Videcon videcon.co.uk | West Yorkshire, 🇬🇧 United Kingdom | 156 | $29.9M | - | - | -21% |
| Safeguard safeguardsecurity.com | Scottsdale, 🇺🇸 United States | 153 | $29.3M | - | - | 5% |
| Netwatch netwatchsystem.com | Newton, 🇺🇸 United States | 150 | $28.1M | - | €19.5M | 23% |
| Iverify iverify.net | Charlotte, 🇺🇸 United States | 145 | $27.8M | - | - | 1% |
| DVS dvs.co.uk | 🇬🇧 United Kingdom | 145 | $27.8M | - | - | 17% |
| PCSC pcscsecurity.com | Torrance, 🇺🇸 United States | 142 | $27.2M | - | - | 6% |
| Alvarado alvaradomfg.com | Chino, 🇺🇸 United States | 135 | $23.5M | - | - | 15% |
| Am-Gard am-gard.com | Pittsburgh, 🇺🇸 United States | 132 | $17.2M | - | - | 6% |
| Kromek kromek.com | Riverside, 🇺🇸 United States | 132 | $23.0M | - | - | -1% |
| 3xLogic 3xlogic.com | Fishers, 🇺🇸 United States | 130 | $22.6M | - | - | - |
| Centerra centerracolorado.com | Loveland, 🇺🇸 United States | 126 | $21.9M | - | - | -2% |
| ZBeta zbeta.com | Larkspur, 🇺🇸 United States | 124 | $21.6M | - | - | 32% |
| Valentis valentisinc.com | Pittsburgh, 🇺🇸 United States | 123 | $23.3M | - | - | 137% |
| PhotoFax photofax.com | Hampshire, 🇺🇸 United States | 121 | $21.1M | - | - | 9% |
| DerisqClosed derisq.com | Mumbai, 🇮🇳 India | 120 | $20.9M | - | - | -16% |
| 2Secure 2secure.se | Stockholm, 🇸🇪 Sweden | 120 | $20.9M | - | - | 10% |
| UAS uas.com | Paoli, 🇺🇸 United States | 118 | $20.5M | - | - | 5% |
| GuardTexas guardtexas.com | Richardson, 🇺🇸 United States | 118 | $20.5M | - | - | 5% |
| Nisos nisos.com | Washington, 🇺🇸 United States | 117 | $20.4M | - | $6M | 9% |
| IntelliCentrics intellicentrics.com | Flower Mound, 🇺🇸 United States | 116 | $20.2M | - | - | -35% |
| Secureone secureone.us | Oak Forest, 🇺🇸 United States | 109 | $19.0M | - | - | 54% |
| Transsicura transsicura.ch | Bern, 🇨🇠Switzerland | 107 | $18.6M | - | - | 30% |
| Intelligarde intelligarde.com | Toronto, 🇨🇦 Canada | 107 | $18.6M | - | - | -3% |
| 1FORCE 1force.com | Roswell, 🇺🇸 United States | 102 | $17.7M | - | - | 31% |
| Passera passera.se | Jönköping, 🇸🇪 Sweden | 102 | $17.7M | - | - | 44% |
| Kooi 247kooi.nl | - | 101 | $17.6M | - | - | - |
| BauWatch bauwatch.de | - | 100 | $17.4M | - | - | 14% |
| Gallaher gallahersafe.com | Alcoa, 🇺🇸 United States | 86 | $15.0M | - | - | 16% |
| Trans-Alarm transalarm.com | Burnsville, 🇺🇸 United States | 86 | $16.4M | - | - | 161% |
| Symetrica symetrica.com | - | 84 | $14.6M | - | - | 17% |
| SADI sadi.pt | Setúbal, 🇵🇹 Portugal | 84 | $14.6M | - | - | 83% |
| Execushield execushield.com | 🇺🇸 United States | 83 | $14.4M | - | - | 28% |
| SW24 sw24.com | New York, 🇺🇸 United States | 83 | $14.4M | - | - | -1% |
| Securatex securatex.com | Oakbrook Terrace, 🇺🇸 United States | 82 | $14.3M | - | - | 5% |
| SentriForce sentriforce.com | Houston, 🇺🇸 United States | 81 | $14.1M | - | - | 25% |
| Vigicore vigicore.com | Arlon, 🇧🇪 Belgium | 80 | $13.9M | - | - | 23% |
| Fieldprint fieldprint.com | 🇺🇸 United States | 78 | $13.6M | - | - | 24% |
| Securitec securitec1.com | Medina, 🇺🇸 United States | 78 | $13.6M | - | - | 53% |
| TDS timedatasecurity.com | Dublin, 🇮🇪 Ireland | 78 | $13.6M | - | - | -22% |
| Innovative knowthefacts.com | Newport News, 🇺🇸 United States | 78 | $13.6M | - | - | -5% |
| eVigilant evigilant.com | Lorton, 🇺🇸 United States | 77 | $13.4M | - | - | -6% |
| Redwire redwireus.com | Tallahassee, 🇺🇸 United States | 75 | $11.7M | - | - | -4% |
| Setronics setronics.com | North Billerica, 🇺🇸 United States | 74 | $11.6M | - | - | 3% |