FIFZX vs. AGG
FIFZX (Fidelity Series Bond Index Fund) and AGG (iShares Core U.S. Aggregate Bond ETF) are both Total Bond Market funds. Over the past 5 years, FIFZX returned 0.10%/yr vs 0.10%/yr for AGG. Their correlation of 0.93 suggests significant overlap in exposure. FIFZX charges 0.00%/yr vs 0.03%/yr for AGG.
Performance
FIFZX vs. AGG - Performance Comparison
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Returns By Period
In the year-to-date period, FIFZX achieves a 0.45% return, which is significantly higher than AGG's 0.25% return.
FIFZX
- 1D
- 0.00%
- 1M
- 0.46%
- YTD
- 0.45%
- 6M
- 0.35%
- 1Y
- 5.45%
- 3Y*
- 4.06%
- 5Y*
- 0.10%
- 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%
FIFZX vs. AGG - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | |
|---|---|---|---|---|---|---|---|---|
FIFZX Fidelity Series Bond Index Fund | 0.45% | 7.15% | 1.41% | 5.54% | -13.46% | -1.96% | 7.65% | 5.12% |
AGG iShares Core U.S. Aggregate Bond ETF | 0.25% | 7.19% | 1.31% | 5.65% | -13.02% | -1.77% | 7.48% | 5.46% |
Correlation
The correlation between FIFZX and AGG is 0.92, 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 | 0.92 |
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 Apr 29, 2019 | 0.93 |
The correlation between FIFZX and AGG has been stable across timeframes, ranging from 0.92 to 0.96 - a consistent structural relationship.
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Return for Risk
FIFZX vs. AGG — Risk / Return Rank
FIFZX
AGG
FIFZX vs. AGG - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Fidelity Series Bond Index Fund (FIFZX) 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.
| FIFZX | AGG | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | 0.00 | ||
| Sortino ratioReturn per unit of downside risk | +0.05 | ||
| Omega ratioGain probability vs. loss probability | 1.24 | 1.24 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 1.84 | 1.87 | -0.03 |
| Martin ratioReturn relative to average drawdown | 5.52 | 5.73 | -0.21 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| FIFZX | AGG | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.35 | 1.34 | 0.00 |
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 | 0.26 | 0.59 | -0.34 |
Drawdowns
FIFZX vs. AGG - Drawdown Comparison
The maximum FIFZX drawdown since its inception was -19.27%, roughly equal to the maximum AGG drawdown of -18.43%. Use the drawdown chart below to compare losses from any high point for FIFZX and AGG.
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Drawdown Indicators
| FIFZX | AGG | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.27% | -18.43% | -0.84% |
Max Drawdown (1Y)Largest decline over 1 year | -2.91% | -2.76% | -0.15% |
Max Drawdown (3Y)Largest decline over 3 years | -6.12% | -6.11% | -0.01% |
Max Drawdown (5Y)Largest decline over 5 years | -18.47% | -17.82% | -0.65% |
Max Drawdown (10Y)Largest decline over 10 years | — | -18.43% | — |
Current DrawdownCurrent decline from peak | -2.75% | -2.14% | -0.61% |
Average DrawdownAverage peak-to-trough decline | -6.70% | -2.71% | -3.99% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.97% | 0.90% | +0.07% |
Volatility
FIFZX vs. AGG - Volatility Comparison
Fidelity Series Bond Index Fund (FIFZX) has a higher volatility of 1.39% compared to iShares Core U.S. Aggregate Bond ETF (AGG) at 1.30%. This indicates that FIFZX'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.
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Volatility by Period
| FIFZX | AGG | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.39% | 1.30% | +0.09% |
Volatility (6M)Calculated over the trailing 6-month period | 2.84% | 2.74% | +0.10% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.99% | 3.85% | +0.14% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.08% | 6.09% | -0.01% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.63% | 5.40% | +0.23% |
FIFZX vs. AGG - Expense Ratio Comparison
FIFZX 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
FIFZX vs. AGG - Dividend Comparison
FIFZX's dividend yield for the trailing twelve months is around 4.00%, which matches 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% |
FIFZX Fidelity Series Bond Index Fund | 4.00% | 3.87% | 3.66% | 3.09% | 1.74% | 1.42% | 3.20% | 1.64% | 0.00% | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
With a correlation of 0.92, FIFZX 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.
FIFZX has higher volatility (1.39%) compared to AGG (1.30%). In terms of maximum drawdown, FIFZX dropped -19.27% vs AGG's -18.43%.
FIFZX currently has the higher Sharpe Ratio (1.35 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.
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