Shares in Macmahon fell sharply yesterday, closing 3¢ lower at 54¢. Macmahon did not declare an interim dividend. The company's chief executive, Nick Bowen, said while the RGP5 contract was substantially complete, there were significant claims and variations which were being negotiated with BHP, which could improve Macmahon's profit if successful. Excluding the RGP5 contract, Macmahon's underlying profit after tax for the period was $18.2 million.