Company record · security vendor

Mimecast

The current Chief Information Security Officer of Mimecast, as tracked by CISO Tribune, is Leslie Nielsen, whose appointment was announced in the week of September 1, 2025.

Tracked by the Wire since September 1, 2025 · 1 recorded move · every claim links to a sourced record

Security leadership timeline

2025-09-01

Mimecast appoints Leslie Nielsen as Chief Information Security Officer

What the company sells

Mimecast sells email security, security awareness training, data loss and insider risk protection, email authentication and collaboration security products, along with an email archiving service for compliance. It is headquartered in London and was founded in 2003. Funds advised by Permira completed their acquisition of Mimecast in May 2022, taking the company private.

Categories: Email security (primary category)
Email authentication and DMARC
Collaboration app security
Insider risk management
Headquarters: London, United Kingdom
Founded: 2003
Ownership: Owned by Permira since 2022
Website: mimecast.com

Products and services

Advanced Email Security
Filters inbound email for phishing, malware and other threats using AI-based detection.
Engage Security Awareness
Delivers ongoing training and phishing simulations intended to reduce human risk among employees.
Incydr Data Protection
Monitors for data such as source code or customer lists leaving the organization through unauthorized channels.
DMARC Analyzer
Sets up and monitors SPF, DKIM and DMARC records to control which senders may use an organization's domains.
Collaboration Threat Protection
Defends against attacks delivered through Microsoft Teams, OneDrive and SharePoint.
Email Archive
Stores email communications and supports e-discovery search for compliance purposes.

Sources

Recorded September 27, 2026 from the sources above. Descriptions are in our own words; we do not rank or recommend vendors, and no vendor pays to be listed or to change what we write. Disclosure: until the publisher confirms it has no business relationship with this company, treat one as possible (how the network works). Spot a factual error? Request a correction.

This record reflects moves verified and tracked by CISO Tribune; it begins in 2026 and is not a complete historical roster. Spot an error or a move we missed? Tell the desk.