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Cyber firm Proofpoint to buy Europe’s Hornetsecurity as it eyes IPO newsthirst.

Pavlo Gonchar | Lightrocket | Getty Images Cybersecurity firm Proofpoint announced Thursday it will acquire Germany-based competitor Hornetsecurity for $1 billion to strengthen its European presence as it explores a return to public markets. The deal marks the largest single acquisition in Proofpoint’s history. The Sunnyvale, California-based company, which is currently owned by private equity…

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