Star Bulk Carriers made headlines this quarter with back-to-back fleet buys that took in 31 vessels, but the Greek owner was also busy behind the scenes rejigging its debt financing.

Star Bulk quietly refinanced all of its debt maturities coming due in 2018 and 2019, striking deals with five lenders for more than $550m in fresh loans.

Details are spelled out in the company's quarterly earnings report recently filed with US securities regulators.