LONDON (dpa-AFX) - WPP Plc (WPPGY, WPP.L) said its wholly-owned operating company Hill+Knowlton Strategies has acquired an additional 25.1% stake in The PBN Co. WPP originally acquired a 49.9% stake in PBN in 2007. PBN will combine with Hill+Knowlton Strategies to operate in Russia, Ukraine, Kazakhstan and throughout the CIS under the brand name 'PBN Hill+Knowlton Strategies.'
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