About Mimecast
Mimecast is a security company founded in 2003 and based in London, England. It serves 42,000 organizations across more than 175 countries. 27 million people are protected through a unified platform focused on securing humans, data, and AI.
Designed for the modern workforce, the company’s platform includes employees and AI agents that operate with human permission. Mimecast protects the files they touch and the work they do, with the goal of keeping work secure and intact across the channels where it is most concentrated.
Mimecast employs between 1,001 and 5,000 people. For over 20 years, it has secured the channels used for work, and it now focuses on the broader attack surface created by people and AI acting at machine pace.
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Insights
Updated 21 Aug 2026Mimecast is competing in a crowded cybersecurity market, and platform-scale rivals are widening their ecosystem reach. CrowdStrike says Fal.Con 2026 will have a record 150+ ecosystem sponsors and more than 10,000 attendees from 4,000 organizations across 71 countries. That kind of scale matters.
Attack behavior is changing too. One report says OAuth token theft is rising, and account takeover is increasingly being carried out by hijacking trusted workflows even when multi-factor authentication is enabled, which points to a shift away from simple perimeter attacks.
Mimecast’s latest signal points to stronger customer urgency around AI-driven threats. The company says 65% of IT and security decision-makers in Asia-Pacific believe an AI-enabled attack against their organization is inevitable within the next 12 months, based on a Vanson Bourne study of 250 decision-makers each in Singapore and Australia.
That finding suggests demand is moving toward controls that address email, identity, and workflow abuse, rather than relying only on perimeter defenses. Buyers are looking at where trust is already built in.
Investor and market sentiment around adjacent email security and encryption categories also appears constructive. A MarketsandMarkets report syndicated across multiple outlets projects the email encryption market to reach USD 23.33 billion by 2030, driven by rising cyber threats and data privacy regulations.
For Mimecast, that mix of threat awareness and regulatory pressure supports continued interest in email-centric security capabilities. The market backdrop is doing some of the work.
Frequently asked questions
Mimecast is headquartered in London, England, United Kingdom.
Mimecast has 1001-5000 employees according to its company profile.
Mimecast operates in the Computer & Network Security sector. Public valuation figures are not always disclosed for private companies.