Shipping services provider Clarkson said it was in talks with the board of RS Platou.The firm did not disclose any details of a possible price for the deal with the Norwegian firm, a broker and investment bank focused on the offshore and shipping markets.Clarkson's shares have more than trebled their values over the past five years even though most parts of the maritime industry were hampered by difficult market conditions.Platou gets about 70% of its sales from investment banking and providing services to the offshore oil industry.On Friday, Clarkson shares closed 1.30% up at 2,258.00p.