iShares iBonds Dec 2023 Term Muni Bond ETF (IBML) is an exchange-traded fund managed by BlackRock that seeks to track the investment results of a market-value-weighted index composed of investment-grade, AMT-free U.S. municipal bonds maturing between January and December 2023. The fund offers exposure to a diversified portfolio of fixed-rate, non-convertible municipal securities issued by U.S. state, federal district, or local government entities and agencies, providing tax-exempt income from coupon payments exempt from federal income tax and alternative minimum tax; it behaves like an individual bond with a defined bullet maturity rather than perpetual exposure to a maturity segment. Launched in 2018 as part of BlackRock's iShares iBonds series, IBML is headquartered in New York, New York, and primarily targets investors seeking tax-efficient, short-term municipal bond ladder building blocks with investment-grade credit quality.
The ETF holds a representative sample of the underlying index securities, excluding certain types such as state and local government series bonds, structured notes with embedded swaps, private placements, floating-rate securities, and Eurobonds; the index is rebalanced monthly on a market capitalization-weighted basis. Geographically, operations focus on U.S. domestic municipal issuers across various states, with no international exposure.
In a major operational change, IBML ceased trading on December 1, 2023, prior to its target maturity window, followed by liquidation and distribution of net assets to shareholders shortly thereafter, transitioning the portfolio to cash and cash equivalents in its final months. This termination aligns with the designed lifecycle of iBonds ETFs, which unwind at maturity to return capital, unlike traditional perpetual bond funds. No recent partnerships, acquisitions, funding rounds, or new product launches directly affected IBML post its closure, though BlackRock has expanded the broader iBonds series with new target-maturity ETFs in corporate, TIPS, and UCITS formats in 2024 and 2025.