Healthcare IT security company Imprivata said Wednesday it has agreed to be acquired by private-equity firm Thoma Bravo, in a deal valued at about $544 million. Thoma Bravo will pay $19.25 per Imprivata share in cash, equal to a 33% premium over Imprivata's closing price Tuesday. Imprivata shares were halted for news pending, but are up 28% in the year so far, while the S&P 500 has gained 5%.
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