Top 10 Active Ransomware Groups to Watch in 2026
Brief
Cl0p, BlackCat/ALPHV, RansomHub, Play, Medusa, Hunters International, INC Ransom, BianLian, Rhysida, and REvil are the ten ransomware groups causing the most damage in 2026, operating leak sites, running affiliate networks, and claiming new corporate victims nearly daily.
The ransomware landscape this year isn’t as fragmented as it was in 2025: the top 10 ransomware groups accounted for 71% of all victims in Q1 2026 alone, reversing the more scattered activity seen throughout the previous year. That concentration is exactly why tracking this specific list matters more than trying to monitor the long tail of smaller, short-lived operations.