VAIPX vs. VSIGX
VAIPX (Vanguard Inflation-Protected Securities Fund Admiral Shares) and VSIGX (Vanguard Intermediate-Term Treasury Index Fund Admiral Shares) are both mutual funds - VAIPX is a Inflation-Protected Bonds fund tracking the Bloomberg U.S. Treasury Inflation Protected Securities Index, while VSIGX is a Government Bonds fund tracking the Bloomberg U.S. Treasury 3–10 Year Bond Index. Both are passively managed. Over the past 10 years, VAIPX returned 2.38%/yr vs 1.10%/yr for VSIGX. Their 0.80 correlation means they have sometimes moved together and sometimes differently. VAIPX charges 0.10%/yr vs 0.06%/yr for VSIGX.
Performance
VAIPX vs. VSIGX - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, VAIPX achieves a 0.54% return, which is significantly higher than VSIGX's -0.61% return. Over the past 10 years, VAIPX has outperformed VSIGX with an annualized return of 2.38%, while VSIGX has yielded a comparatively lower 1.10% annualized return.
VAIPX
- 1D
- 0.09%
- 1M
- -0.39%
- 6M
- 0.15%
- YTD
- 0.54%
- 1Y
- 1.95%
- 3Y*
- 3.66%
- 5Y*
- 0.29%
- 10Y*
- 2.38%
- ALL TIME*
- 2.94%
VSIGX
- 1D
- 0.10%
- 1M
- -0.40%
- 6M
- -0.51%
- YTD
- -0.61%
- 1Y
- 1.36%
- 3Y*
- 3.77%
- 5Y*
- -0.17%
- 10Y*
- 1.10%
- ALL TIME*
- 2.16%
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 |
VAIPX vs. VSIGX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
VAIPX Vanguard Inflation-Protected Securities Fund Admiral Shares | 0.54% | 6.87% | 1.85% | 3.83% | -11.92% | 5.69% | 10.96% | 8.16% | -1.39% | 2.91% |
VSIGX Vanguard Intermediate-Term Treasury Index Fund Admiral Shares | -0.61% | 7.36% | 1.65% | 4.39% | -10.69% | -2.60% | 7.65% | 6.26% | 1.35% | 1.58% |
Correlation
The correlation between VAIPX and VSIGX is 0.84, meaning they have usually moved in the same direction, including during past declines.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.84 |
Correlation (3Y) Balances recent behavior with more history. | 0.88 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.82 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.79 |
Correlation (All Time) Calculated using the full available price history since Nov 23, 2009 | 0.80 |
The correlation between VAIPX and VSIGX has been stable across timeframes, ranging from 0.79 to 0.88 - 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
VAIPX vs. VSIGX — Risk / Return Rank
VAIPX
VSIGX
VAIPX vs. VSIGX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard Inflation-Protected Securities Fund Admiral Shares (VAIPX) and Vanguard Intermediate-Term Treasury Index Fund Admiral Shares (VSIGX). 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.
| VAIPX | VSIGX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.03 | ||
| Sortino ratioReturn per unit of downside risk | +0.04 | ||
| Omega ratioGain probability vs. loss probability | 1.13 | 1.12 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 1.19 | 0.82 | +0.36 |
| Martin ratioReturn relative to average drawdown | 3.37 | 1.92 | +1.45 |
Loading charts...
Drawdowns
VAIPX vs. VSIGX - Drawdown Comparison
The maximum VAIPX drawdown since its inception was -15.04%, smaller than the maximum VSIGX drawdown of -16.15%. Use the drawdown chart below to compare losses from any high point for VAIPX and VSIGX.
Loading charts...
Drawdown Indicators
| VAIPX | VSIGX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -15.04% | -16.15% | +1.11% |
Max Drawdown (1Y)Largest decline over 1 year | -2.05% | -2.86% | +0.81% |
Max Drawdown (3Y)Largest decline over 3 years | -3.83% | -4.08% | +0.25% |
Max Drawdown (5Y)Largest decline over 5 years | -14.40% | -15.03% | +0.63% |
Max Drawdown (10Y)Largest decline over 10 years | -14.40% | -16.15% | +1.75% |
Current DrawdownCurrent decline from peak | -1.18% | -2.34% | +1.16% |
Average DrawdownAverage peak-to-trough decline | -3.79% | -3.49% | -0.30% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.72% | 1.22% | -0.50% |
Volatility
VAIPX vs. VSIGX - Volatility Comparison
The current volatility for Vanguard Inflation-Protected Securities Fund Admiral Shares (VAIPX) is 0.75%, while Vanguard Intermediate-Term Treasury Index Fund Admiral Shares (VSIGX) has a volatility of 0.87%. This indicates that VAIPX experiences smaller price fluctuations and is considered to be less risky than VSIGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| VAIPX | VSIGX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.75% | 0.87% | -0.12% |
Volatility (6M)Calculated over the trailing 6-month period | 2.50% | 2.62% | -0.12% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.33% | 3.36% | -0.03% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.97% | 5.34% | +0.63% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.31% | 4.44% | +0.87% |
VAIPX vs. VSIGX - Expense Ratio Comparison
VAIPX has a 0.10% expense ratio, which is higher than VSIGX's 0.06% 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. VSIGX - Dividend Comparison
VAIPX's dividend yield for the trailing twelve months is around 5.07%, more than VSIGX's 3.53% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
VAIPX Vanguard Inflation-Protected Securities Fund Admiral Shares | 5.07% | 4.74% | 4.17% | 4.31% | 8.45% | 5.13% | 1.38% | 2.29% | 3.12% | 2.41% | 3.49% | 0.88% |
VSIGX Vanguard Intermediate-Term Treasury Index Fund Admiral Shares | 3.53% | 3.76% | 3.95% | 2.70% | 1.71% | 1.66% | 2.21% | 2.21% | 2.05% | 1.67% | 1.56% | 1.70% |
Frequently Asked Questions
VAIPX and VSIGX have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
VSIGX has higher volatility (0.87%) compared to VAIPX (0.75%). In terms of maximum drawdown, VAIPX dropped -15.04% vs VSIGX's -16.15%.
VAIPX currently has the higher Sharpe Ratio (0.74 vs 0.70), 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 VAIPX and VSIGX
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