Demand for the bonds exceeded $10 billion, said a source at the Portuguese Treasury and Debt Management Agency, which this month expressed its interest in diversifying its sources of financing.

Portugal offered a yield, or annual return to investors, of 5.15 percent, the source said.

The bond sale was handled via a syndicate of banks made up of Barclays, Danske Bank, HSBC and Societe Generale.

Portugal last placed dollar-dominated bonds in March 2010 when it raised $1.25 billion in a sale of five-year debt.

Portugal emerged on May 17 from a three-year bailout programme supervised by the European Union and International Monetary Fund.

The centre-right government aims to lower the country’s annual public deficit to the equivalent of 4.0 percent of total economic output by the end of this year from 4.9 percent in 2013.