iShares iBonds Dec 2045 Term Treasury ETF (IBGB) 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, 2045, and December 15, 2045; the fund employs a representative sampling technique to replicate the performance of the ICE 2045 Maturity US Treasury Index. Managed by BlackRock Fund Advisors under iShares Trust, it primarily invests in fixed-coupon U.S. Treasury securities denominated in U.S. dollars, with nearly 100% allocation to United States Treasury holdings across various coupons such as 5%, 4.75%, and 3%; the portfolio features a weighted average maturity of approximately 19.59 years, an effective duration of 12.97 years, and a 30-day SEC yield around 4.60%, with an expense ratio of 0.07%. Launched on March 25, 2025, and domiciled in the United States with headquarters aligned to BlackRock's operations in New York, the ETF targets investors seeking defined-maturity Treasury exposure for bond ladders or long-term planning, trading on Nasdaq and unwinding positions to return capital on its December 15, 2045, termination date. In 2025, the fund added Jonathan Graves and Marcus Tom as portfolio managers effective August 1, alongside James Mauro, enhancing management depth amid growing assets under management reaching approximately $6.27 million; no major acquisitions, partnerships, or product shifts specific to IBGB were reported, though BlackRock continued expanding its broader iShares ETF suite with active and bond market offerings. The ETF operates exclusively in U.S. fixed income markets, serving institutional and retail investors focused on low-risk, long-duration government securities without ESG strategies.