The iBoxx SGD Overall Index is designed to measure the performance of SGD-denominated debt from sovereign, sub-sovereign and corporate issuers. The index includes Singapore Government Securities with a minimum amount outstanding of SGD 500 million and non-sovereign bonds with a minimum amount outstanding of SGD 150 million. Securities must have a minimum initial time to maturity of 18 months at issuance and a remaining time to maturity of at least one year at rebalancing. Unrated bonds are included at 50% of notional value and defaulted bonds are excluded.