IGLB tracks an index of long-term US corporates. The idea here is fairly simple: the index wants to invest in a broad selection of investment grade, corporate debt securities issued by US and non-US companies, denominated in US dollars. It also aims for long-term exposure by only including debt with a remaining maturity of at least 10 years. Components of the portfolio are market-value-weighted and are rebalanced at the last calendar day of each month. Prior to August 1, 2018, the fund tracked the Bloomberg Barclays US Long Credit Bond Index.