VEXRX vs. VIIIX

Last updated Jun 9, 2026

VEXRX (Vanguard Explorer Fund Admiral Shares) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - VEXRX is a Small Cap Growth Equities fund managed by Vanguard, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, VEXRX returned 12.88%/yr vs 15.32%/yr for VIIIX. Their correlation of 0.89 suggests significant overlap in exposure. VEXRX charges 0.29%/yr vs 0.02%/yr for VIIIX.

Performance

VEXRX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Explorer Fund Admiral Shares (VEXRX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VEXRX achieves a 12.04% return, which is significantly higher than VIIIX's 8.42% return. Over the past 10 years, VEXRX has underperformed VIIIX with an annualized return of 12.88%, while VIIIX has yielded a comparatively higher 15.32% annualized return.

VEXRX

• 1D: -3.04%
• 1M: -0.37%
• YTD: 12.04%
• 6M: 10.30%
• 1Y: 23.66%
• 3Y*: 15.93%
• 5Y*: 6.50%
• 10Y*: 12.88%

VIIIX

• 1D: -2.63%
• 1M: -0.08%
• YTD: 8.42%
• 6M: 8.48%
• 1Y: 24.54%
• 3Y*: 21.94%
• 5Y*: 13.54%
• 10Y*: 15.32%

*Multi-year figures are annualized to reflect compound growth (CAGR)

VEXRX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VEXRX Vanguard Explorer Fund Admiral Shares	12.04%	7.19%	17.40%	19.90%	-23.23%	16.07%	31.51%	31.42%	-2.34%	22.64%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	8.42%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	31.48%	-4.41%	21.82%

Correlation

The correlation between VEXRX and VIIIX is 0.82, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.82
Correlation (3Y) Calculated over the trailing 3-year period	0.82
Correlation (5Y) Calculated over the trailing 5-year period	0.86
Correlation (10Y) Calculated over the trailing 10-year period	0.86
Correlation (All Time) Calculated using the full available price history since Nov 13, 2001	0.89

The correlation between VEXRX and VIIIX has been stable across timeframes, ranging from 0.82 to 0.89 - a consistent structural relationship.

VEXRX vs. VIIIX - Sectors Allocation Comparison

Sectors	VEXRX	VIIIX
Industrials	21.9%	8.3%
Technology	20.6%	35.7%
Healthcare	17.5%	8.5%
Consumer Cyclical	12.0%	10.2%
Financial Services	11.2%	11.6%
Energy	4.5%	3.5%
Real Estate	3.0%	1.9%
Basic Materials	2.8%	1.8%
Consumer Defensive	2.7%	4.9%
Communication Services	2.2%	11.3%
Utilities	1.6%	2.4%

Return for Risk

VEXRX vs. VIIIX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

VEXRX

VEXRX Risk / Return Rank: 35
VEXRX Sharpe Ratio Rank: 29
VEXRX Sortino Ratio Rank: 28
VEXRX Omega Ratio Rank: 26
VEXRX Calmar Ratio Rank: 45
VEXRX Martin Ratio Rank: 48

VIIIX

VIIIX Risk / Return Rank: 59
VIIIX Sharpe Ratio Rank: 56
VIIIX Sortino Ratio Rank: 49
VIIIX Omega Ratio Rank: 53
VIIIX Calmar Ratio Rank: 62
VIIIX Martin Ratio Rank: 75

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

VEXRX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Explorer Fund Admiral Shares (VEXRX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.

	VEXRX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.45	2.13	-0.68
Sortino ratio: Return per unit of downside risk	2.08	2.87	-0.79
Omega ratio: Gain probability vs. loss probability	1.25	1.39	-0.13
Calmar ratio: Return relative to maximum drawdown	2.47	2.92	-0.45
Martin ratio: Return relative to average drawdown	9.59	13.57	-3.98
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VEXRX vs. VIIIX - Sharpe Ratio Comparison

The current VEXRX Sharpe Ratio is 1.45, which is lower than the VIIIX Sharpe Ratio of 2.13. The chart below compares the historical Sharpe Ratios of VEXRX and VIIIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	VEXRX	VIIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.45	2.13	-0.68
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.31	0.80	-0.50
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.59	0.85	-0.26
Sharpe Ratio (All Time) Calculated using the full available price history	0.46	0.49	-0.03

Drawdowns

VEXRX vs. VIIIX - Drawdown Comparison

The maximum VEXRX drawdown since its inception was -57.26%, roughly equal to the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for VEXRX and VIIIX.

Drawdown Indicators

	VEXRX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-57.26%	-55.18%	-2.08%
Max Drawdown (1Y) Largest decline over 1 year	-10.16%	-8.90%	-1.26%
Max Drawdown (3Y) Largest decline over 3 years	-24.35%	-18.75%	-5.60%
Max Drawdown (5Y) Largest decline over 5 years	-32.67%	-24.50%	-8.17%
Max Drawdown (10Y) Largest decline over 10 years	-39.86%	-33.79%	-6.07%
Current Drawdown Current decline from peak	-3.04%	-2.94%	-0.10%
Average Drawdown Average peak-to-trough decline	-9.93%	-10.01%	+0.08%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.61%	1.91%	+0.70%

Volatility

VEXRX vs. VIIIX - Volatility Comparison

Vanguard Explorer Fund Admiral Shares (VEXRX) has a higher volatility of 5.45% compared to Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) at 3.81%. This indicates that VEXRX's price experiences larger fluctuations and is considered to be riskier than VIIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VEXRX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.45%	3.81%	+1.64%
Volatility (6M) Calculated over the trailing 6-month period	13.02%	9.41%	+3.61%
Volatility (1Y) Calculated over the trailing 1-year period	17.29%	12.19%	+5.10%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.34%	16.93%	+4.41%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.84%	18.08%	+3.76%

VEXRX vs. VIIIX - Expense Ratio Comparison

VEXRX has a 0.29% expense ratio, which is higher than VIIIX's 0.02% expense ratio.

Dividends

VEXRX vs. VIIIX - Dividend Comparison

VEXRX's dividend yield for the trailing twelve months is around 6.73%, more than VIIIX's 2.48% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VEXRX Vanguard Explorer Fund Admiral Shares	6.73%	7.54%	12.72%	0.89%	5.22%	16.17%	6.76%	5.08%	11.13%	11.46%	4.63%	10.89%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.48%	2.11%	3.66%	2.66%	3.39%	4.79%	3.07%	2.86%	2.45%	1.84%	2.38%	2.47%

Frequently Asked Questions

Can I hold both VEXRX and VIIIX in my portfolio?

VEXRX and VIIIX have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VEXRX or VIIIX?

VEXRX has higher volatility (5.45%) compared to VIIIX (3.81%). In terms of maximum drawdown, VEXRX dropped -57.26% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

VIIIX currently has the higher Sharpe Ratio (2.13 vs 1.45), 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.