The fair value of Star Bulk Carriers shares has been given a lift in response to the company's fourth-quarter results and attempts to deleverage its balance sheet.

Drewry Financial Research Services has upgraded the Marousi-based bulker owner's stock to $15.50 from $14.20 while maintaining an attractive view on the shares.

The London-based firm noted operating revenue during the quarter gained 33% to $107.7m