VSIGX vs. VAIPX
VSIGX (Vanguard Intermediate-Term Treasury Index Fund Admiral Shares) and VAIPX (Vanguard Inflation-Protected Securities Fund Admiral Shares) are both mutual funds - VSIGX is a Government Bonds fund tracking the Bloomberg U.S. Treasury 3–10 Year Bond Index, while VAIPX is a Inflation-Protected Bonds fund tracking the Bloomberg U.S. Treasury Inflation Protected Securities Index. Both are passively managed. Over the past 10 years, VSIGX returned 1.10%/yr vs 2.38%/yr for VAIPX. Their 0.80 correlation means they have sometimes moved together and sometimes differently. VSIGX charges 0.06%/yr vs 0.10%/yr for VAIPX.
Performance
VSIGX vs. VAIPX - Performance Comparison
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Returns By Period
In the year-to-date period, VSIGX achieves a -0.61% return, which is significantly lower than VAIPX's 0.54% return. Over the past 10 years, VSIGX has underperformed VAIPX with an annualized return of 1.10%, while VAIPX has yielded a comparatively higher 2.38% annualized return.
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%
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%
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 |
VSIGX vs. VAIPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
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% |
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% |
Correlation
The correlation between VSIGX and VAIPX 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 VSIGX and VAIPX has been stable across timeframes, ranging from 0.79 to 0.88 - a consistent structural relationship.
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Return for Risk
VSIGX vs. VAIPX — Risk / Return Rank
VSIGX
VAIPX
VSIGX vs. VAIPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard Intermediate-Term Treasury Index Fund Admiral Shares (VSIGX) and Vanguard Inflation-Protected Securities Fund Admiral Shares (VAIPX). 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.
| VSIGX | VAIPX | 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 | 1.12 | 1.13 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 0.82 | 1.19 | -0.36 |
| Martin ratioReturn relative to average drawdown | 1.92 | 3.37 | -1.45 |
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Drawdowns
VSIGX vs. VAIPX - Drawdown Comparison
The maximum VSIGX drawdown since its inception was -16.15%, which is greater than VAIPX's maximum drawdown of -15.04%. Use the drawdown chart below to compare losses from any high point for VSIGX and VAIPX.
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Drawdown Indicators
| VSIGX | VAIPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -16.15% | -15.04% | -1.11% |
Max Drawdown (1Y)Largest decline over 1 year | -2.86% | -2.05% | -0.81% |
Max Drawdown (3Y)Largest decline over 3 years | -4.08% | -3.83% | -0.25% |
Max Drawdown (5Y)Largest decline over 5 years | -15.03% | -14.40% | -0.63% |
Max Drawdown (10Y)Largest decline over 10 years | -16.15% | -14.40% | -1.75% |
Current DrawdownCurrent decline from peak | -2.34% | -1.18% | -1.16% |
Average DrawdownAverage peak-to-trough decline | -3.49% | -3.79% | +0.30% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.22% | 0.72% | +0.50% |
Volatility
VSIGX vs. VAIPX - Volatility Comparison
Vanguard Intermediate-Term Treasury Index Fund Admiral Shares (VSIGX) has a higher volatility of 0.87% compared to Vanguard Inflation-Protected Securities Fund Admiral Shares (VAIPX) at 0.75%. This indicates that VSIGX's price experiences larger fluctuations and is considered to be riskier than VAIPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| VSIGX | VAIPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.87% | 0.75% | +0.12% |
Volatility (6M)Calculated over the trailing 6-month period | 2.62% | 2.50% | +0.12% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.36% | 3.33% | +0.03% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.34% | 5.97% | -0.63% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.44% | 5.31% | -0.87% |
VSIGX vs. VAIPX - Expense Ratio Comparison
VSIGX has a 0.06% expense ratio, which is lower than VAIPX's 0.10% 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
VSIGX vs. VAIPX - Dividend Comparison
VSIGX's dividend yield for the trailing twelve months is around 3.53%, less than VAIPX's 5.07% 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
VSIGX and VAIPX 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, VSIGX dropped -16.15% vs VAIPX's -15.04%.
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.
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