Proofpoint Signs Agreement to Acquire Hornetsecurity

Proofpoint, a Sunnyvale, California-based cybersecurity and compliance company, has entered into a definitive agreement to acquire Hornetsecurity Group, a Hanover, Germany-based provider of AI-powered Microsoft 365 security, data protection, compliance, and security awareness services.

Hornetsecurity’s flagship product, 365 Total Protection, is a multi-tenant, unified platform to deliver integrated services including advanced email security, backup, security awareness, access and permission control, and domain fraud protection.

The acquired company comes to the Proofpoint portfolio with more than $160 million in annual recurring revenue (ARR), more than 20 percent year-over-year growth. The company provides solutions to more than 12,000 channel partners and MSPs and more than 125,000 SMBs across Europe. Meanwhile, Proofpoint claims 85 percent of the Fortune 100 and over half of the Fortune 1000 for its enterprise grade security offerings. Together, the companies intend to deliver complementary, purpose-built platforms fueled by shared threat intelligence.

“As attackers grow more sophisticated and people remain the primary target, organizations need security that protects them wherever they work—across email, cloud applications, and every digital channel,” said Sumit Dhawan, CEO of Proofpoint. “With the addition of Hornetsecurity, we’re excited to extend our industry-leading, human-centric security platform to better serve the unique needs of MSPs and SMBs. We look forward to deepening our investment in the European markets as part of our global growth strategy.”

The acquisition is expected to close in the second half of 2025, subject to customary closing conditions. Terms of the deal are confidential.

Channel Impact^®
The acquisition is expected to enhance Proofpoint’s ability to serve SMBs through managed service providers. The move will also strengthen Proofpoint’s position in European markets.