Strong first-day trading for two private equity portfolio companies in October may augur well for fourth quarter PE-backed initial public offerings. Real-estate services provider Realogy Holdings Corp. (NYSE: RLGY), best known for the Coldwell Banker and Century 21 brands and owned by Leon Black's Apollo Global Management LLC (NYSE: APO), surged 27 percent on Oct. 11, after pricing at the high end of its expected range.

Online photo service Shutterstock (NYSE: SSTK), which is backed by Insight Venture Partners, priced above its expected range and also traded up 27 percent on its debut the same day.

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