VAIPX vs. FXNAX
VAIPX (Vanguard Inflation-Protected Securities Fund Admiral Shares) and FXNAX (Fidelity U.S. Bond Index Fund) are both mutual funds - VAIPX is a Inflation-Protected Bonds fund managed by Vanguard, while FXNAX is a Total Bond Market fund tracking the Bloomberg U.S. Aggregate Bond Index. Over the past 10 years, VAIPX returned 2.64%/yr vs 1.51%/yr for FXNAX. A 0.79 correlation means they provide meaningful diversification when combined. VAIPX charges 0.10%/yr vs 0.03%/yr for FXNAX.
Performance
VAIPX vs. FXNAX - Performance Comparison
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Returns By Period
In the year-to-date period, VAIPX achieves a 1.65% return, which is significantly higher than FXNAX's 0.40% return. Over the past 10 years, VAIPX has outperformed FXNAX with an annualized return of 2.64%, while FXNAX has yielded a comparatively lower 1.51% annualized return.
VAIPX
- 1D
- 0.00%
- 1M
- 0.13%
- YTD
- 1.65%
- 6M
- 1.27%
- 1Y
- 5.31%
- 3Y*
- 4.04%
- 5Y*
- 1.17%
- 10Y*
- 2.64%
FXNAX
- 1D
- 0.00%
- 1M
- 0.51%
- YTD
- 0.40%
- 6M
- 0.34%
- 1Y
- 5.37%
- 3Y*
- 4.02%
- 5Y*
- 0.12%
- 10Y*
- 1.51%
VAIPX vs. FXNAX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
VAIPX Vanguard Inflation-Protected Securities Fund Admiral Shares | 1.65% | 6.87% | 1.85% | 3.83% | -11.92% | 5.69% | 10.96% | 8.16% | -1.39% | 2.91% |
FXNAX Fidelity U.S. Bond Index Fund | 0.40% | 7.14% | 1.35% | 5.82% | -13.55% | -2.10% | 7.63% | 8.50% | 0.04% | 3.50% |
Correlation
The correlation between VAIPX and FXNAX is 0.80, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.80 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.87 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.81 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.79 |
Correlation (All Time) Calculated using the full available price history since May 5, 2011 | 0.79 |
The correlation between VAIPX and FXNAX has been stable across timeframes, ranging from 0.79 to 0.87 - a consistent structural relationship.
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Return for Risk
VAIPX vs. FXNAX — Risk / Return Rank
VAIPX
FXNAX
VAIPX vs. FXNAX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard Inflation-Protected Securities Fund Admiral Shares (VAIPX) and Fidelity U.S. Bond Index Fund (FXNAX). 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.
| VAIPX | FXNAX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.18 | ||
| Sortino ratioReturn per unit of downside risk | +0.29 | ||
| Omega ratioGain probability vs. loss probability | 1.28 | 1.24 | +0.03 |
| Calmar ratioReturn relative to maximum drawdown | 2.53 | 1.83 | +0.70 |
| Martin ratioReturn relative to average drawdown | 8.02 | 5.61 | +2.41 |
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
| VAIPX | FXNAX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.54 | 1.36 | +0.18 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.20 | 0.02 | +0.18 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.50 | 0.30 | +0.20 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.52 | 0.45 | +0.06 |
Drawdowns
VAIPX vs. FXNAX - Drawdown Comparison
The maximum VAIPX drawdown since its inception was -15.04%, smaller than the maximum FXNAX drawdown of -19.51%. Use the drawdown chart below to compare losses from any high point for VAIPX and FXNAX.
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Drawdown Indicators
| VAIPX | FXNAX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -15.04% | -19.51% | +4.47% |
Max Drawdown (1Y)Largest decline over 1 year | -2.05% | -2.94% | +0.89% |
Max Drawdown (3Y)Largest decline over 3 years | -4.52% | -6.16% | +1.64% |
Max Drawdown (5Y)Largest decline over 5 years | -14.40% | -18.54% | +4.14% |
Max Drawdown (10Y)Largest decline over 10 years | -14.40% | -19.51% | +5.11% |
Current DrawdownCurrent decline from peak | -0.09% | -2.89% | +2.80% |
Average DrawdownAverage peak-to-trough decline | -3.81% | -3.87% | +0.06% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.65% | 0.96% | -0.31% |
Volatility
VAIPX vs. FXNAX - Volatility Comparison
The current volatility for Vanguard Inflation-Protected Securities Fund Admiral Shares (VAIPX) is 0.97%, while Fidelity U.S. Bond Index Fund (FXNAX) has a volatility of 1.41%. This indicates that VAIPX experiences smaller price fluctuations and is considered to be less risky than FXNAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| VAIPX | FXNAX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.97% | 1.41% | -0.44% |
Volatility (6M)Calculated over the trailing 6-month period | 2.32% | 2.82% | -0.50% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.38% | 3.97% | -0.59% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.99% | 6.07% | -0.08% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.32% | 5.01% | +0.31% |
VAIPX vs. FXNAX - Expense Ratio Comparison
VAIPX has a 0.10% expense ratio, which is higher than FXNAX's 0.03% 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
VAIPX vs. FXNAX - Dividend Comparison
VAIPX's dividend yield for the trailing twelve months is around 4.49%, more than FXNAX's 3.71% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
FXNAX Fidelity U.S. Bond Index Fund | 3.71% | 3.58% | 3.40% | 3.15% | 1.81% | 1.74% | 2.92% | 2.68% | 2.74% | 2.57% | 2.76% | 2.52% |
VAIPX Vanguard Inflation-Protected Securities Fund Admiral Shares | 4.49% | 4.74% | 4.17% | 4.31% | 8.45% | 5.13% | 1.38% | 2.29% | 3.12% | 2.41% | 3.49% | 0.88% |
Frequently Asked Questions
VAIPX and FXNAX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
FXNAX has higher volatility (1.41%) compared to VAIPX (0.97%). In terms of maximum drawdown, VAIPX dropped -15.04% vs FXNAX's -19.51%.
VAIPX currently has the higher Sharpe Ratio (1.54 vs 1.36), 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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