Proofpoint Acquires Hornetsecurity in $1.8 Billion Deal to Strengthen SMB Cybersecurity

Proofpoint announced the completion of its $1.8 billion acquisition of Hornetsecurity, expanding its human- and AI-centric Microsoft 365 security capabilities for SMBs through MSP channels. Hornetsecurity will operate as a dedicated business unit under founder Daniel Hofmann, leveraging combined threat intelligence and maintaining product and partner strategies. The move boosts Proofpoint’s European presence, adds a platform serving 125,000+ customers via 12,000+ MSPs, and underscores focus on protecting the emerging “agentic workspace,” with Hornetsecurity reporting nearly $200M ARR and 20% YoY growth.