Mimecast, a leader in securing humans, data and AI, has announced the appointment of Ranjan Singh as its new Chief Executive Officer, effective immediately. Singh succeeds Marc van Zadelhoff, who led Mimecast through a major transformation from an email security provider into a unified human, data, and AI risk platform. Van Zadelhoff will continue with the company in a Board advisory role, ensuring continuity during the leadership transition.
Mimecast’s leadership change comes at a time when cybersecurity platforms are increasingly converging around human behavior, data protection, and artificial intelligence. The company’s strategy has evolved beyond traditional email security toward a broader platform designed to manage interconnected risks across communication channels, endpoints, and AI systems.
The appointment of Ranjan Singh signals a continuation of this platform-led growth strategy, with an emphasis on accelerating product innovation and integrating AI capabilities across Mimecast’s security ecosystem.
Ranjan Singh joined Mimecast in 2025 as Chief Product & Technology Officer, where he played a central role in unifying product and engineering teams and driving the company’s AI-focused development strategy. Under his leadership, Mimecast delivered more than 100 new products and enhancements in a single year, strengthening its position as a unified risk management platform.
He also led the integration of multiple acquisitions across data security, compliance, and collaboration tools, helping consolidate them into a single architecture designed to manage both human and AI-driven risks.
“The convergence of human behavior, data, and AI has created a new risk surface that organizations weren’t built to handle in isolation,” said Ranjan Singh, Chief Executive Officer of Mimecast. “Securing and governing all three together is one of the most pressing challenges in cybersecurity today. Mimecast has spent years building toward this, and I’m deeply grateful to be trusted by the Board, our customers and colleagues to lead this next chapter.”
According to Mimecast’s Board leadership, Singh’s appointment aligns with the company’s focus on accelerating innovation in AI-driven security platforms. His prior experience includes serving as Chief Product Officer at Kaseya, where he oversaw multiple SaaS business units and a large product portfolio generating significant enterprise-scale revenue.
His leadership experience across Crestron Electronics and IPC Systems further strengthens his background in scaling complex product ecosystems and delivering enterprise-grade software platforms.
The Board emphasized that Mimecast is positioned to capitalize on AI-driven opportunities in cybersecurity, particularly as organizations seek unified platforms capable of addressing rapidly expanding risk surfaces.
Mimecast continues to position itself as a unified security platform designed to protect organizations across communication channels, user behavior, endpoints, and AI systems. Its architecture integrates visibility, policy enforcement, threat containment, and remediation into a single framework.
With more than 42,000 customers and 27 million users globally, Mimecast leverages large-scale behavioral intelligence to detect and mitigate threats across evolving digital environments. The company’s long-term focus remains on delivering automated, AI-enhanced protection across human and machine interactions.
Mimecast protects the work of every person in the organization, across every channel, from every actor, human and AI. Built around four core capabilities — see everything, score and apply policy, block and contain, and close the loop — Mimecast maps the full attack chain across email, human behavior, endpoints, AI agents, and data. The result is one unified view of risk and automated protection across every layer. Founded in 2003 and headquartered in London, Mimecast serves more than 42,000 organizations and 27 million users worldwide. Analyzing 24 trillion behavioral signals annually, Mimecast draws on a 20+ year behavioral baseline that is unmatched in the industry. We secure humans, data & AI. Work Protected. Learn more at www.mimecast.com
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