iShares Core Total USD Bond Market ETF (IUSB US) – Investment PropositioniShares Core Total USD Bond Market ETF (IUSB) presents a broad, investment-grade-oriented take on the U.S. dollar bond market that spans Treasuries, agencies, securitized debt, and corporate credit, with a measured allocation to below-investment-grade issues for completeness. The strategy aims to deliver diversified income and total return through a rules-based, market-value-weighted portfolio that balances interest-rate exposure with ...