Premier Oil shareholders approved the oil producer's $120 million takeover of E.ON's North Sea oil and gas fields on April 25, as the deal cleared its final hurdle.

As many as 99.99% of votes cast at a special shareholder meeting on April 25 supported the transaction, which will give Premier additional stakes in 40 oil and gas licenses in the U.K. North Sea.

Premier, whose shares touched a five-month high of 77.50 pence per share on April 25, said the deal will be complete by the end of this month.

When the transaction was first announced, Premier's shares were suspended as the deal was classified as a reverse takeover.