2026 MatTek — TheGentlemen leak-site claim (unverified)
Data compromised
Actor listing on criminal leak site; specific exfiltrated data categories and victim count not published in open monitors reviewed — unverified
Technical writeup
Unverified ransomware / leak-site claim — discovered Jul 24, 2026 per extortion leak-site monitors. TheGentlemen listed MatTek (mattek.com). MatTek Corporation is a life sciences company based in the USA. The organization had not publicly confirmed the incident in sources reviewed. BreachHistory indexes recordsAffected 0 and labels the row unverified.
Root cause
Unverified TheGentlemen ransomware/extortion leak-site listing naming MatTek (mattek.com) — organization had not confirmed at indexing time