iShares 20+ Year Treasury Bond ETF (TLT) is an exchange-traded fund that seeks to track the investment results of an index composed of U.S. Treasury bonds with remaining maturities greater than twenty years. The fund holds a portfolio of long-term U.S. Treasury securities issued by the U.S. government, providing investors with exposure to the fixed-income segment of the U.S. Treasury market; it offers high duration sensitivity to interest rate changes, making it a benchmark for long-duration bond performance; and it distributes monthly dividends derived from bond interest payments. Managed by BlackRock, Inc., the ETF was launched in 2002 and is domiciled in the United States with primary listing on the NASDAQ exchange. TLT operates globally through investor access but focuses exclusively on U.S. Treasury obligations traded in domestic markets, targeting institutional and retail fixed-income investors seeking yield, duration, or hedging strategies. In recent developments, the fund experienced significant asset inflows amid heightened market volatility in 2025 due to Federal Reserve policy shifts; BlackRock announced enhancements to iShares ETF liquidity tools in late 2024, benefiting TLT's trading efficiency; and the ETF saw a portfolio rebalancing in Q3 2025 to align with updated index methodology amid rising long-term yields.