WPP PLC (LSE:WPP) may have spent years being written off as an advertising dinosaur, but Berenberg reckons investors have become too gloomy. Shares in the FTSE 250 group jumped 5.5% to 276.5p after the German bank has initiated coverage of the UK giant with a 'buy' rating, arguing that a sharp de-rating across the sector has created an opportunity for investors willing to look beyond concerns about artificial intelligence and slowing growth.