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Ransomware group thegentlemen hits Groupe AC Environnement
Groupe AC Environnement — a energy & utilities target operating in FR has been listed by the thegentlemen ransomware group on 2026-10-26. The information below reflects what the threat actor has publicly claimed on their leak site; the details have not been independently verified.
Incident Report
| Target Organization | Groupe AC Environnement |
|---|---|
| Threat Group | thegentlemen |
| Summary | Groupe AC Environnement, a energy & utilities organization in France, was listed by the thegentlemen ransomware group on its leak site on 2026-10-31. |
| Date of Breach | 2026-10-26 |
| Discovery Date | 2026-10-31 |
| Region | FR |
| Target Domain | ac-environnement.com |
| Business Sector | Energy & Utilities |
| Severity | MEDIUM |
Claim by thegentlemen
ac-environnement.com Groupe AC Environnement is a French environmental engineering company founded in 1997 in Pontarlier, delivering integrated solutions for water treatment, wastewater, waste management and bioremediation. With 160 employees across five subsidiaries including GEG, Maraîch'Hydro and Biovéa, it has completed over 120 projects in 13 countries. Its standout project is the STEP des Voraces, France's first large-scale wastewater plant featuring demethanization serving 300,000 equivalent inhabitants. The group offers 26 specialized technical solutions spanning drinking water, industrial effluent, zero liquid discharge and circular economy applications. Led by Johan Hansma, it operates across the full project lifecycle from design and construction to long-term operations and maintenance.
Posted by the thegentlemen threat actor on its public leak site. This is the group's own statement and has not been independently verified by HackerFeeds.
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