The iBoxx GBP Corporates 0-5Y Index is designed to measure the performance of investment grade, GBP-denominated corporate bonds, with a minimum amount outstanding of GBP 250 million for bonds settled after Dec. 31, 2010, and GBP 100 million for bonds settled on or before that date, while bonds with less than one year remaining require GBP 250 million. Bonds must have a minimum initial time to maturity of one year at issuance and a remaining time to maturity up to five years at rebalancing.