FBLTX vs. FXAIX
FBLTX (Fidelity SAI Long-Term Treasury Bond Index Fund) and FXAIX (Fidelity 500 Index Fund) are both mutual funds - FBLTX is a Government Bonds fund managed by Fidelity, while FXAIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, FBLTX returned -2.52%/yr vs 15.00%/yr for FXAIX. Their -0.11 correlation means they have often moved in opposite directions in the past. FBLTX charges 0.03%/yr vs 0.02%/yr for FXAIX.
Performance
FBLTX vs. FXAIX - Performance Comparison
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Returns By Period
In the year-to-date period, FBLTX achieves a -3.37% return, which is significantly lower than FXAIX's 9.35% return. Over the past 10 years, FBLTX has underperformed FXAIX with an annualized return of -2.52%, while FXAIX has yielded a comparatively higher 15.00% annualized return.
FBLTX
- 1D
- -0.16%
- 1M
- -3.63%
- 6M
- -3.28%
- YTD
- -3.37%
- 1Y
- -2.17%
- 3Y*
- -2.29%
- 5Y*
- -8.31%
- 10Y*
- -2.52%
- ALL TIME*
- -1.05%
FXAIX
- 1D
- 1.66%
- 1M
- -0.56%
- 6M
- 7.79%
- YTD
- 9.35%
- 1Y
- 20.63%
- 3Y*
- 19.03%
- 5Y*
- 12.68%
- 10Y*
- 15.00%
- ALL TIME*
- 13.89%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
FBLTX vs. FXAIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
FBLTX Fidelity SAI Long-Term Treasury Bond Index Fund | -3.37% | 4.39% | -8.05% | 2.71% | -31.84% | -4.89% | 18.27% | 14.36% | -1.24% | 9.06% |
FXAIX Fidelity 500 Index Fund | 9.35% | 17.84% | 25.01% | 26.29% | -18.14% | 28.71% | 18.42% | 31.48% | -4.43% | 21.82% |
Correlation
The correlation between FBLTX and FXAIX is 0.23, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.23 |
Correlation (3Y) Balances recent behavior with more history. | 0.17 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.08 |
Correlation (10Y) Provides a long-term view across more market conditions. | -0.08 |
Correlation (All Time) Calculated using the full available price history since Oct 16, 2015 | -0.11 |
The correlation between FBLTX and FXAIX shifts across timeframes, from -0.11 (all time) to 0.23 (1 year), reflecting how their relationship changes across market environments.
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Return for Risk
FBLTX vs. FXAIX — Risk / Return Rank
FBLTX
FXAIX
FBLTX vs. FXAIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI Long-Term Treasury Bond Index Fund (FBLTX) and Fidelity 500 Index Fund (FXAIX). 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.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| FBLTX | FXAIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -1.47 | ||
| Sortino ratioReturn per unit of downside risk | -1.99 | ||
| Omega ratioGain probability vs. loss probability | 1.00 | 1.26 | -0.26 |
| Calmar ratioReturn relative to maximum drawdown | -0.05 | 2.06 | -2.11 |
| Martin ratioReturn relative to average drawdown | -0.10 | 8.86 | -8.97 |
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Drawdowns
FBLTX vs. FXAIX - Drawdown Comparison
The maximum FBLTX drawdown since its inception was -49.06%, which is greater than FXAIX's maximum drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for FBLTX and FXAIX.
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Drawdown Indicators
| FBLTX | FXAIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -49.06% | -33.79% | -15.27% |
Max Drawdown (1Y)Largest decline over 1 year | -7.66% | -8.89% | +1.23% |
Max Drawdown (3Y)Largest decline over 3 years | -14.75% | -18.76% | +4.01% |
Max Drawdown (5Y)Largest decline over 5 years | -44.19% | -24.50% | -19.69% |
Max Drawdown (10Y)Largest decline over 10 years | -49.06% | -33.79% | -15.27% |
Current DrawdownCurrent decline from peak | -42.95% | -2.11% | -40.84% |
Average DrawdownAverage peak-to-trough decline | -21.28% | -3.77% | -17.51% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.54% | 2.07% | +1.47% |
Volatility
FBLTX vs. FXAIX - Volatility Comparison
The current volatility for Fidelity SAI Long-Term Treasury Bond Index Fund (FBLTX) is 2.48%, while Fidelity 500 Index Fund (FXAIX) has a volatility of 3.44%. This indicates that FBLTX experiences smaller price fluctuations and is considered to be less risky than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| FBLTX | FXAIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.48% | 3.44% | -0.96% |
Volatility (6M)Calculated over the trailing 6-month period | 6.79% | 10.09% | -3.30% |
Volatility (1Y)Calculated over the trailing 1-year period | 9.26% | 12.86% | -3.60% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 15.57% | 17.03% | -1.46% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 14.51% | 18.07% | -3.56% |
FBLTX vs. FXAIX - Expense Ratio Comparison
FBLTX has a 0.03% expense ratio, which is higher than FXAIX's 0.02% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
FBLTX vs. FXAIX - Dividend Comparison
FBLTX's dividend yield for the trailing twelve months is around 3.97%, more than FXAIX's 1.07% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FBLTX Fidelity SAI Long-Term Treasury Bond Index Fund | 3.97% | 4.04% | 3.60% | 3.29% | 2.25% | 1.81% | 6.73% | 2.39% | 2.87% | 2.68% | 3.70% | 0.39% |
FXAIX Fidelity 500 Index Fund | 1.07% | 1.11% | 1.25% | 1.45% | 1.69% | 1.22% | 1.60% | 2.06% | 2.72% | 1.97% | 2.52% | 2.83% |
Frequently Asked Questions
FBLTX and FXAIX have a correlation of 0.23, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
FXAIX has higher volatility (3.44%) compared to FBLTX (2.48%). In terms of maximum drawdown, FBLTX dropped -49.06% vs FXAIX's -33.79%.
FXAIX currently has the higher Sharpe Ratio (1.43 vs -0.04), 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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