FIBUX vs. AGG
FIBUX (Fidelity Flex U.S. Bond Index Fund) and AGG (iShares Core U.S. Aggregate Bond ETF) are both Total Bond Market funds. Over the past 5 years, FIBUX returned 0.09%/yr vs 0.10%/yr for AGG. Their correlation of 0.93 suggests significant overlap in exposure. FIBUX charges 0.00%/yr vs 0.03%/yr for AGG.
Performance
FIBUX vs. AGG - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, FIBUX achieves a 0.46% return, which is significantly higher than AGG's 0.25% return.
FIBUX
- 1D
- 0.00%
- 1M
- 0.46%
- YTD
- 0.46%
- 6M
- 0.33%
- 1Y
- 5.40%
- 3Y*
- 4.04%
- 5Y*
- 0.09%
- 10Y*
- —
AGG
- 1D
- -0.21%
- 1M
- 0.24%
- YTD
- 0.25%
- 6M
- 0.09%
- 1Y
- 5.14%
- 3Y*
- 3.95%
- 5Y*
- 0.10%
- 10Y*
- 1.57%
FIBUX vs. AGG - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
FIBUX Fidelity Flex U.S. Bond Index Fund | 0.46% | 7.20% | 1.31% | 5.46% | -13.41% | -2.16% | 7.08% | 8.58% | 0.12% | 3.81% |
AGG iShares Core U.S. Aggregate Bond ETF | 0.25% | 7.19% | 1.31% | 5.65% | -13.02% | -1.77% | 7.48% | 8.46% | 0.09% | 4.02% |
Correlation
The correlation between FIBUX and AGG is 0.91, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.91 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.94 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.96 |
Correlation (All Time) Calculated using the full available price history since Mar 10, 2017 | 0.93 |
The correlation between FIBUX and AGG has been stable across timeframes, ranging from 0.91 to 0.96 - a consistent structural relationship.
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
FIBUX vs. AGG — Risk / Return Rank
FIBUX
AGG
FIBUX vs. AGG - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Fidelity Flex U.S. Bond Index Fund (FIBUX) and iShares Core U.S. Aggregate Bond ETF (AGG). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
| FIBUX | AGG | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.02 | ||
| Sortino ratioReturn per unit of downside risk | +0.03 | ||
| Omega ratioGain probability vs. loss probability | 1.24 | 1.24 | +0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.83 | 1.87 | -0.04 |
| Martin ratioReturn relative to average drawdown | 5.45 | 5.73 | -0.28 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
Loading charts...
Sharpe Ratios by Period
| FIBUX | AGG | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.36 | 1.34 | +0.02 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.02 | 0.02 | 0.00 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | — | 0.29 | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.35 | 0.59 | -0.24 |
Drawdowns
FIBUX vs. AGG - Drawdown Comparison
The maximum FIBUX drawdown since its inception was -19.76%, which is greater than AGG's maximum drawdown of -18.43%. Use the drawdown chart below to compare losses from any high point for FIBUX and AGG.
Loading charts...
Drawdown Indicators
| FIBUX | AGG | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.76% | -18.43% | -1.33% |
Max Drawdown (1Y)Largest decline over 1 year | -2.97% | -2.76% | -0.21% |
Max Drawdown (3Y)Largest decline over 3 years | -6.09% | -6.11% | +0.02% |
Max Drawdown (5Y)Largest decline over 5 years | -18.40% | -17.82% | -0.58% |
Max Drawdown (10Y)Largest decline over 10 years | — | -18.43% | — |
Current DrawdownCurrent decline from peak | -3.43% | -2.14% | -1.29% |
Average DrawdownAverage peak-to-trough decline | -5.79% | -2.71% | -3.08% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.00% | 0.90% | +0.10% |
Volatility
FIBUX vs. AGG - Volatility Comparison
Fidelity Flex U.S. Bond Index Fund (FIBUX) has a higher volatility of 1.38% compared to iShares Core U.S. Aggregate Bond ETF (AGG) at 1.30%. This indicates that FIBUX's price experiences larger fluctuations and is considered to be riskier than AGG based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| FIBUX | AGG | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.38% | 1.30% | +0.08% |
Volatility (6M)Calculated over the trailing 6-month period | 2.86% | 2.74% | +0.12% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.02% | 3.85% | +0.17% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.04% | 6.09% | -0.05% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.11% | 5.40% | -0.29% |
FIBUX vs. AGG - Expense Ratio Comparison
FIBUX has a 0.00% expense ratio, which is lower than AGG's 0.03% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
FIBUX vs. AGG - Dividend Comparison
FIBUX's dividend yield for the trailing twelve months is around 4.08%, more than AGG's 3.99% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
AGG iShares Core U.S. Aggregate Bond ETF | 3.99% | 3.89% | 3.74% | 3.13% | 2.39% | 1.77% | 2.14% | 2.70% | 2.72% | 2.32% | 2.39% | 2.45% |
FIBUX Fidelity Flex U.S. Bond Index Fund | 4.08% | 3.95% | 3.65% | 2.93% | 1.62% | 1.18% | 2.32% | 2.96% | 2.70% | 2.45% | 0.00% | 0.00% |
Frequently Asked Questions
With a correlation of 0.91, FIBUX and AGG move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
FIBUX has higher volatility (1.38%) compared to AGG (1.30%). In terms of maximum drawdown, FIBUX dropped -19.76% vs AGG's -18.43%.
FIBUX currently has the higher Sharpe Ratio (1.36 vs 1.34), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
Find the right allocation for FIBUX and AGG
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer