iShares iBonds Dec 2055 Term Treasury ETF (IBGL) is an exchange-traded fund that seeks to track the investment results of an index composed of U.S. Treasury bonds maturing between January 1, 2055, and December 15, 2055; specifically, it provides exposure to a portfolio of long-duration U.S. Treasury securities through a single ticker with characteristics designed to mature like a bond while trading like a stock. The fund holds primarily U.S. Treasury bonds, including Treasury Bond (Old) at approximately 60% and Treasury Bond (Other) at approximately 39%, alongside minimal cash positions; it distributes regular income that varies over time, transitioning to cash-like instruments in its final months as holdings mature, with a termination date on or about December 15, 2055. Launched on March 25, 2025, and managed by BlackRock with an expense ratio of 0.07%, the ETF features a weighted average maturity of 29.61 years, effective duration of 15.25 years, and a 30-day SEC yield of 4.79% as of June 30, 2025; it is listed on NASDAQ and part of the iShares iBonds ETF suite offered by BlackRock, Inc., headquartered in San Francisco, California. In recent developments since its inception earlier in 2025, the fund has rapidly grown net assets to approximately $3.7 million while maintaining a concentrated portfolio of two primary Treasury holdings; it reflects BlackRock's ongoing expansion of the iBonds target maturity ETF series with this 2055-dated Treasury-focused offering, building on prior launches in shorter maturities, amid a low-interest-rate environment shifting toward higher yields. The ETF targets investors seeking income, stability, bond laddering, and interest rate risk management within the U.S. fixed income market, operating exclusively in U.S. dollar-denominated assets backed by the full faith and credit of the U.S. government.