Eni UK Holding plc has made an open offer to the shareholders of Hindustan Oil Exploration Co for acquiring 26,115,455 fully paid up shares or 20 per cent of the paid up equity share capital of the company. In a statement sent to the Bombay Stock Exchange (BSE) today, Eni UK Holding has offered to pay Rs 144.2 per share, amounting to a total of Rs 376.58 crore for the said acquisition. The offer will be opened on June 11 and conclude on June 30. NM Rothschild and Sons India is the manager.