Apollo Global Management LLC (NYSE: APO) agreed to acquire home-security monitoring company ADT Corp. (NYSE: ADT) for about $6.9 billion -- less than three weeks after one of the private- equity firm’s co-founders said its list of potential leveraged buyouts had disappeared as debt markets seized up.

Apollo will pay $42 a share in cash for the Boca Raton, Florida-based company, according to a statement Tuesday. That’s 56 percent above ADT’s closing price on Friday.

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