VTSIX vs. WFSPX
VTSIX (Vanguard Tax-Managed Small-Cap Fund Institutional Shares) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - VTSIX is a Small Cap Blend Equities fund managed by BlackRock, while WFSPX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, VTSIX returned 11.42%/yr vs 15.68%/yr for WFSPX. Their correlation of 0.83 suggests significant overlap in exposure. VTSIX charges 0.06%/yr vs 0.03%/yr for WFSPX.
Performance
VTSIX vs. WFSPX - Performance Comparison
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Returns By Period
In the year-to-date period, VTSIX achieves a 20.13% return, which is significantly higher than WFSPX's 9.77% return. Over the past 10 years, VTSIX has underperformed WFSPX with an annualized return of 11.42%, while WFSPX has yielded a comparatively higher 15.68% annualized return.
VTSIX
- 1D
- 0.05%
- 1M
- 4.66%
- YTD
- 20.13%
- 6M
- 17.65%
- 1Y
- 35.42%
- 3Y*
- 16.45%
- 5Y*
- 6.82%
- 10Y*
- 11.42%
WFSPX
- 1D
- -0.36%
- 1M
- 0.10%
- YTD
- 9.77%
- 6M
- 8.77%
- 1Y
- 25.45%
- 3Y*
- 21.35%
- 5Y*
- 13.57%
- 10Y*
- 15.68%
VTSIX vs. WFSPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
VTSIX Vanguard Tax-Managed Small-Cap Fund Institutional Shares | 20.13% | 5.96% | 8.64% | 15.99% | -16.14% | 27.12% | 11.09% | 23.30% | -8.59% | 13.08% |
WFSPX iShares S&P 500 Index Fund Class K | 9.77% | 17.83% | 24.94% | 26.25% | -18.14% | 28.63% | 18.43% | 31.45% | -4.83% | 21.27% |
Correlation
The correlation between VTSIX and WFSPX is 0.74, 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 | 0.74 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.74 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.79 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.78 |
Correlation (All Time) Calculated using the full available price history since Apr 21, 1999 | 0.83 |
The correlation between VTSIX and WFSPX has been stable across timeframes, ranging from 0.74 to 0.83 - a consistent structural relationship.
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Return for Risk
VTSIX vs. WFSPX — Risk / Return Rank
VTSIX
WFSPX
VTSIX vs. WFSPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard Tax-Managed Small-Cap Fund Institutional Shares (VTSIX) and iShares S&P 500 Index Fund Class K (WFSPX). 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.
| VTSIX | WFSPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.05 | ||
| Sortino ratioReturn per unit of downside risk | +0.11 | ||
| Omega ratioGain probability vs. loss probability | 1.36 | 1.39 | -0.03 |
| Calmar ratioReturn relative to maximum drawdown | 4.34 | 3.01 | +1.33 |
| Martin ratioReturn relative to average drawdown | 14.52 | 13.58 | +0.94 |
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Drawdowns
VTSIX vs. WFSPX - Drawdown Comparison
The maximum VTSIX drawdown since its inception was -57.81%, roughly equal to the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for VTSIX and WFSPX.
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Drawdown Indicators
| VTSIX | WFSPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -57.81% | -58.21% | +0.40% |
Max Drawdown (1Y)Largest decline over 1 year | -8.59% | -8.90% | +0.31% |
Max Drawdown (3Y)Largest decline over 3 years | -27.92% | -18.74% | -9.18% |
Max Drawdown (5Y)Largest decline over 5 years | -27.92% | -24.51% | -3.41% |
Max Drawdown (10Y)Largest decline over 10 years | -43.86% | -33.74% | -10.12% |
Current DrawdownCurrent decline from peak | 0.00% | -1.72% | +1.72% |
Average DrawdownAverage peak-to-trough decline | -8.91% | -12.76% | +3.85% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.56% | 1.97% | +0.59% |
Volatility
VTSIX vs. WFSPX - Volatility Comparison
Vanguard Tax-Managed Small-Cap Fund Institutional Shares (VTSIX) and iShares S&P 500 Index Fund Class K (WFSPX) have volatilities of 4.88% and 4.67%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| VTSIX | WFSPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.88% | 4.67% | +0.21% |
Volatility (6M)Calculated over the trailing 6-month period | 12.09% | 9.83% | +2.26% |
Volatility (1Y)Calculated over the trailing 1-year period | 17.78% | 12.49% | +5.29% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 21.46% | 16.97% | +4.49% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 23.13% | 18.07% | +5.06% |
VTSIX vs. WFSPX - Expense Ratio Comparison
VTSIX has a 0.06% expense ratio, which is higher than WFSPX'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
VTSIX vs. WFSPX - Dividend Comparison
VTSIX's dividend yield for the trailing twelve months is around 1.14%, less than WFSPX's 1.59% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
VTSIX Vanguard Tax-Managed Small-Cap Fund Institutional Shares | 1.14% | 1.31% | 1.47% | 1.52% | 1.54% | 1.19% | 1.11% | 1.17% | 1.29% | 1.13% | 1.03% | 1.30% |
WFSPX iShares S&P 500 Index Fund Class K | 1.59% | 1.72% | 1.41% | 1.50% | 2.02% | 1.82% | 1.66% | 1.99% | 2.00% | 1.62% | 2.37% | 2.49% |
Frequently Asked Questions
VTSIX and WFSPX have a correlation of 0.74, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
VTSIX has higher volatility (4.88%) compared to WFSPX (4.67%). In terms of maximum drawdown, VTSIX dropped -57.81% vs WFSPX's -58.21%.
WFSPX currently has the higher Sharpe Ratio (2.15 vs 2.10), 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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