Private equity firm Apollo Global Management LLC (APO.N) is preparing to take U.S. security company ADT Corp public at a $15 billion plus valuation, just over a year after buying it, sources familiar with the situation said on Thursday.

The stock market listing could be the largest private equity-backed initial public offering since hotel company Hilton Worldwide Holdings Inc (HLT.N) went public with a $19.7 billion valuation in 2013.

It would be a quick turnaround for Apollo, which bought ADT for roughly $7 billion in 2016 and merged it with Protection 1, a smaller U.S. peer it had previously acquired.

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