The iShares iBonds Mar 2020 Term Corporate ETF (IBDC) aims to replicate the investment performance of the Bloomberg Barclays 2020 Maturity Corporate Index. This index comprises U.S. dollar-denominated, investment-grade corporate debt instruments specifically chosen to mature between April 1, 2019, and March 31, 2020. Typically, the fund allocates at least 90% of its assets to the securities included in this benchmark, which can involve direct or indirect holdings via other funds.