The cybersecurity company Proofpoint said it has agreed to be acquired by the private -equity firm Thoma Bravo for $12.3 billion in cash, or about $176 a share, up about 34% from Friday’s closing price.

“Today’s announcement is a testament to the strength of Proofpoint’s people-centric approach to cybersecurity and compliance and underscores our important role preventing, defending and responding to today’s threats,” Proofpoint CEO Gary Steele said in a statement. He said that as a private company, Proofpoint can be more agile…

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