Refiner Neste's shares fall as renewables margins disappoint

Finnish oil refiner and biofuel producer Neste said on Friday it was optimistic about its performance for 2018 but disappointment over margins in its renewable fuel division hit the company's shares.Neste, which produces diesel and other fuels from renewable material at plants in Singapore and Rotterdam, said it now expected a "very strong" 2018 compared with its previous guidance of a "strong" year.The shares have nearly doubled in value over the past year, helped by its profitable biofuel busi