Mimecast, a privately owned company founded in 2003 and headquartered in the UK, employs approximately 2140 people. Its primary business is providing computer and network security solutions, with a focus on fraud prevention.
Mimecast identified a phishing campaign impersonating the UK Home Office and UK Visas & Immigration to obtain Sponsorship Management System login credentials. Separate news reports unrelated to Mimecast cover federal scrutiny of a tax strategy, a review of SALT, and Jamie Dimon's warning about a weakening economy. These reports appeared on September 8th and 12th, 2025. A final report notes similarities between tactics used by spies and cybersecurity threat actors.
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