Proofpoint Acquires Nuclei

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.

Proofpoint Acquires Hornetsecurity Group

May 15, 2025

Cybersecurity

Proofpoint, Inc. has entered into a definitive agreement to acquire Hornetsecurity Group, a Hanover-based provider of AI-powered Microsoft 365 security, data protection, compliance, and security awareness solutions. The acquisition (expected to close in H2 2025) expands Proofpoint's reach into the MSP channel and SMB market and brings Hornetsecurity's ~$160–200M ARR business and large MSP partner ecosystem into Proofpoint's platform.

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.

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.

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.