Proofpoint to Acquire Hornetsecurity Group to Expand Global M365 Cybersecurity for MSPs

Hornetsecurity Acquires Zerospam

March 25, 2021

Cybersecurity

Hornetsecurity Group has acquired Zerospam, a Montreal-based cloud email protection specialist, to accelerate its North American expansion and broaden its email security and compliance offerings. The transaction is supported by Hornetsecurity shareholders PSG and Verdane; financial terms were not disclosed.

Hornetsecurity Group to Acquire Altospam

April 3, 2025

Cybersecurity

Hornetsecurity, a provider of next-generation cloud security, compliance, backup and security awareness solutions, signed a definitive agreement to acquire Altospam, a French email cybersecurity company. The deal is subject to approval by the French Ministry for the Economy under French Foreign Direct Investment (FDI) regulations.

Hornetsecurity Group Acquires Altaro

January 12, 2021

Cloud & SaaS

Hornetsecurity Group, a Germany-based cloud email security provider backed by PSG and Verdane, has agreed to acquire Altaro, a Malta-headquartered developer of backup solutions for Microsoft 365 and virtual machines. The deal expands Hornetsecurity's product suite and international footprint by adding Altaro's Office 365 and VM backup capabilities to create a broader cloud security and compliance platform.

Proofpoint Acquires Tessian

December 19, 2023

Cybersecurity

Proofpoint, Inc. has completed the acquisition of Tessian, a provider of AI-powered behavioral email security and data loss prevention. The deal integrates Tessian's machine-learning detection for misdirected emails and data exfiltration into Proofpoint's threat and information protection platform to expand its AI-driven defenses across email, cloud, and endpoints.

Proofpoint Acquires InteliSecure for $62.5M

February 22, 2021

Cybersecurity

Proofpoint, Inc. agreed to acquire InteliSecure, a data-loss-protection managed services provider, for $62.5 million in cash. The acquisition (expected to close in Q1 2021) adds roughly 150 employees and strengthens Proofpoint’s people-centric cloud-based DLP and managed security services; InteliSecure was sold by investor Frontier Growth.

Proofpoint Acquires Dathena

January 10, 2022

Cybersecurity

Proofpoint has completed the acquisition of Dathena, an AI-powered data discovery and classification specialist, to enhance its Information & Cloud Security and people-centric DLP offerings. The deal integrates Dathena's AI-driven data classification capabilities into Proofpoint's cloud platform, expanding its data protection capabilities and strengthening its presence in Asia.