iShares Core 10+ Year USD Bond ETF (ILTB) is an exchange-traded fund that seeks to track the investment results of an index composed of U.S. dollar-denominated bonds rated either investment grade or high yield with remaining maturities greater than ten years. Issued by BlackRock under the iShares brand and launched on December 8, 2009, the ETF holds a diversified portfolio of approximately 3,800 bonds, with top issuers including United States Treasury (approximately 45% weight), AT&T Inc., Oracle Corporation, Mexico Government International Bonds, and UnitedHealth Group Inc.; it provides exposure to long-term U.S. Treasury bonds, investment-grade corporate bonds, high-yield bonds, and sovereign debt, primarily targeting institutional and retail investors seeking duration-matched fixed income exposure. The fund maintains a low expense ratio of 0.06% and trades on U.S. exchanges, with assets under management supporting broad liquidity for fixed income portfolio construction. Headquartered in New York, New York, as part of BlackRock's global iShares platform, ILTB operates principally in U.S. markets while including select USD-denominated international sovereign holdings. In recent years, the ETF has maintained its core index-tracking strategy amid interest rate volatility, with no major structural changes, partnerships, acquisitions, or new product launches reported for ILTB specifically in 2024 or 2025; performance reflects broader bond market dynamics, including a 2024 total return of approximately -2.78% amid shifting yields.