LONDON--WPP PLC's (WPP.LN) operating company Grey Healthcare Group (GHG), has acquired a minority interest in PARx Solutions, Inc., for an undisclosed sum, the advertising firm said Tuesday.

Shares at 1202 GMT up 15 pence, or 1%, at GBP15.75, valuing the advertising firm at GBP20.56 billion.

-Write to Razak Musah Baba at razak.baba@wsj.com; Twitter: @Raztweet

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