Cybersecurity Companies in Connecticut: Ranked Lists by City (2026)
76 cities with a ranked listUpdated 0 paid placements in any rankingHow we rank →
We rank cybersecurity companies in 76 Connecticut cities, 32,402 city rankings in all. The largest lists are Greenwich (678), Stamford (676) and North Stamford (671).
Cybersecurity companies by city in Connecticut
Every Connecticut city with a ranked list of cybersecurity companies, largest first. Each list ranks IT firms within 75 mi of the city.
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
Highest IFR Scores among Connecticut cybersecurity companies
Each score is computed within its own city list, so use the city pages to compare businesses. Shown for orientation, not as a state ranking.
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
| # | IT firm | IFR Score | City list | Google rating |
|---|---|---|---|---|
| 1 | Systech MSP | 67 | #1 in Greenwich | 5.0★ (346) |
| 2 | eMazzanti Technologies | 66 | #2 in Greenwich | 4.9★ (216) |
| 3 | FileShred | 66 | #1 in Glastonbury | 5.0★ (112) |
| 4 | Dental Hi-Tech Management, Inc | 65 | #3 in Greenwich | 5.0★ (102) |
| 5 | Lynx Systems | 62 | #3 in New Britain | 5.0★ (15) |
| 6 | Total Defense | 62 | #3 in Old Saybrook | 4.9★ (250) |
| 7 | TOSS C3 - Cybersecurity, Cloud Computing, Co-Managed IT & Information Security | 61 | #2 in Killingly Center | 5.0★ (23) |
| 8 | Network Professional Training Center-NPTC | 61 | #3 in Killingly Center | 5.0★ (46) |
| 9 | Cyber Surf Shop | 60 | #3 in Enfield | 4.7★ (124) |
| 10 | Protected Harbor | 59 | #3 in Winchester Center | 4.9★ (47) |