The Riverside Co. has bought a majority stake in Spectrio LLC, an audio and video marketing company, for an undisclosed price.

The sale of Oldsmar, Florida-based Spectrio marks an exit for SJ Partners LLC, a private equity firm based in New York. SJ first invested in Spectrio in 2005 when the portfolio company did business as Audio Messaging Solutions. Since then, SJ completed fourteen add-on acquisitions: AdTel Group LLC, Audio Marketing Systems Inc., Audiomax, Focuspoint Inc., Hold It Systems Inc., HoldPlus Inc., Sonic River Studios Inc., Broadcast Marketing & Entertainment LLC, Perception Marketing LLC, Performance Audio Marketing, Phone on Hold Marketing Systems Inc., Profit-Tell International Inc. and Vericom Inc.

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