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The iShares Core U.S. Aggregate Bond ETF (AGG) is an exchange-traded fund that seeks to track the performance of a broad U.S. fixed income index, providing exposure to a diversified basket of government, corporate, and mortgage-backed securities. The ETF is managed by BlackRock and trades under the ticker AGG on NYSE Arca.
Classified as a U.S. fixed-income ETF, AGG aims to reflect, before fees and expenses, the aggregate performance of the bonds that comprise its benchmark index. To achieve this objective, the fund employs a passive management strategy, maintaining a portfolio that seeks to replicate the composition and weighting of the fixed income index.
AGG’s benchmark index includes a broad range of investment-grade U.S. fixed income securities, weighted by float-adjusted market capitalization, with periodic rebalancing as new issues are added and older securities mature.
Diversification and sector exposure
AGG provides exposure to the U.S. fixed income market, diversified across different credit segments and maturities, including:
U.S. Treasury securities.
Investment-grade corporate bonds.
Mortgage-backed securities (MBS).
Government agency bonds.
This structure gives the ETF a profile that seeks to broadly reflect the aggregated performance of the U.S. credit market in a balanced manner.
Structure and costs
Shares of AGG are traded on the secondary market, while creation and redemption of shares are carried out by authorized participants, a mechanism that helps keep the ETF’s market price close to its net asset value (NAV).
The fund carries a low expense ratio, typical of passively managed fixed-income ETFs, and does not charge a performance fee. AGG makes periodic income distributions, derived from interest payments on the bonds held in its portfolio. The ETF has a single share class and trades exclusively under the ticker AGG.
History and evolution of the ETF
The iShares Core U.S. Aggregate Bond ETF was launched in 2003, amid growth in the ETF industry and increasing demand for diversified exposure to the U.S. fixed income market.
Since its inception, AGG has become one of the leading U.S. fixed-income ETFs, widely used by institutional and individual investors as a core component of diversified portfolio allocations.
Between 2020 and 2024, the ETF reflected the dynamics of interest rate cycles, shifts in monetary policy, and changes in fixed income demand, while maintaining high liquidity and broad use as a risk management tool in fixed income.
