Port and ferry operator Stena Line UK has bought the former Anglesey Aluminium site as part of plans to expand the Port of Holyhead.
A former "eco park", Anglesey Aluminium was taken over in 2016 by Orthios after smelting came to an end in 2009. However, it collapsed in March this year with loss of 140 jobs.
Now, Stena Line said it has bought the 213-acre site to extend and develop the port's operations, which it has owned for 27 years. The value of the deal was not disclosed but the purchase was described as a "significant investment" by the firm.
