Cybersecurity company Proofpoint has made two major acquisition announcements that are set to strengthen its position in cloud security and compliance. These moves, made in May 2025, are seen as strategic steps to better protect users across modern collaboration platforms, especially Microsoft 365.
The first big move by Proofpoint is the acquisition of Hornetsecurity, a well-known German cybersecurity firm. Hornetsecurity specializes in cloud-based security for Microsoft 365 and offers services like email filtering, backup, and compliance. The company works with more than 12,000 managed service providers (MSPs) and has over 125,000 customers globally. With a revenue of around $160 million annually and strong growth, Hornetsecurity is a solid addition to Proofpoint’s ecosystem.
By bringing Hornetsecurity on board, Proofpoint aims to reach more small and mid-sized businesses (SMBs) and MSPs. Hornetsecurity’s cloud-native platform is already popular in Europe and North America, and its tools will now be paired with Proofpoint’s advanced threat protection and intelligence. Together, they plan to offer complete security solutions that are easier for businesses to adopt and manage.
The second acquisition is of Nuclei, a U.S.-based startup that focuses on workplace communication archiving and compliance. Nuclei’s platform helps businesses archive and manage data from over 100 messaging and collaboration tools, including Slack, Microsoft Teams, Zoom, WhatsApp, and RingCentral. It uses artificial intelligence to enrich and organize the data, which makes it easier for companies to meet legal and regulatory requirements.
With this deal, Proofpoint enhances its ability to offer digital compliance solutions. For companies that deal with large volumes of messages across various platforms, Nuclei’s features will be very useful. The integration will help security and legal teams monitor and protect sensitive conversations in real time, without missing important risks or policy violations.
Both of these deals are expected to close in the second half of 2025, subject to regulatory approvals. While the exact value of the Nuclei deal wasn’t shared, the Hornetsecurity acquisition is estimated to be around $1 billion.
These back-to-back acquisitions reflect a clear strategy from Proofpoint. The company is not just focusing on traditional email security anymore. It is now expanding into areas like collaboration security, managed services, and enterprise-grade compliance solutions. This makes sense in today’s environment where remote work, hybrid IT setups, and cloud-based platforms are common.
Proofpoint’s CEO, Sumit Dhawan, stated that these acquisitions are meant to better serve customers of all sizes, especially those using Microsoft 365 and facing rising compliance pressures. He also mentioned that the company wants to help organizations defend against modern threats that target users through email, messaging apps, and cloud platforms.
As cybersecurity threats grow more complex, Proofpoint’s latest moves show that it’s serious about staying ahead. These acquisitions give the company more tools to help customers stay secure, compliant, and ready for whatever threats come next.
In a busy month for cybersecurity mergers and acquisitions, Proofpoint’s two announcements clearly stand out as important steps toward more complete and people-focused protection.
Stay alert, and keep your security measures updated!
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