WPP Plc (NYSE: WPP) shares are trading higher on Wednesday. The company is reportedly exploring possibilities to divest its 40% interest in the market research firm Kantar. The British owner of advertising agencies aims to generate cash and tackle its declining stock value, Bloomberg reported, citing people familiar with the matter. The London-based company is collaborating with an adviser to examine various options, including the complete sale of its remaining stake in Kantar, the report read. Also Read: British Advertising Giant WPP Reveals CFO Transition This stake was retained after the 20…