Marketing and PR software firm Vocus, a public company, agreed to be acquired for $446.5 million today — that’s 48% more than it was worth at market close last Friday.

vocusVocus’ board of directors approved the purchase price of $446.5 million in a merger agreement with Chicago-based private equity firm GTCRThat price represents a premium of 48% on Vocus’ closing share price on April 4 (it was $12.18). The deal has yet to close and is pending shareholder approval.

In addition, Maryland-based Vocus shares that GTCR will also buy Vocus’ outstanding shares of convertible preferred stock for $77.3 million.

Vocus claims to have over 16,000 annual subscribers to its marketing automation tools. The company’s subscriptions range between $300 to $2,500 per month.

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