Proofpoint Acquires Hornetsecurity Group

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.

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.

TA Associates, PSG and Verdane Invest in Hornetsecurity

September 6, 2022

Cybersecurity

Hornetsecurity, a Hanover-based cloud security and compliance SaaS provider, has received a strategic growth investment from TA Associates, joining existing investors PSG Equity and Verdane in a co-control partnership with management. The capital will support product build-out, international expansion and continued M&A as Hornetsecurity scales its email security, backup and compliance offerings.

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 Acuvity

February 12, 2026

Cybersecurity

Proofpoint, Inc. has acquired Acuvity, an AI security and governance platform provider, to enhance its capabilities for securing AI agents, copilots, and model-connected applications across the enterprise. The acquisition adds AI-native visibility, governance and runtime protection to Proofpoint’s human- and agent-centric cybersecurity platform, enabling broader protection of people, data and AI-driven workflows.

Thoma Bravo Completes Acquisition of Proofpoint, Inc.

August 31, 2021

Cybersecurity

Thoma Bravo, a leading software-focused private equity firm, completed the acquisition of Proofpoint, Inc. for approximately $12.3 billion in cash. Proofpoint stockholders received $176.00 per share and Proofpoint will operate as a private company under Thoma Bravo to accelerate product innovation and growth in people-centric cybersecurity.