VEMPX vs. VMIAX

Last updated Jun 23, 2026

VEMPX (Vanguard Extended Market Index Fund Institutional Plus Shares) and VMIAX (Vanguard Materials Index Fund Admiral Shares) are both mutual funds - VEMPX is a Mid Cap Blend Equities fund managed by Vanguard, while VMIAX is a Materials fund managed by Vanguard. Over the past 10 years, VEMPX returned 12.35%/yr vs 10.29%/yr for VMIAX. Their correlation of 0.81 suggests significant overlap in exposure. VEMPX charges 0.04%/yr vs 0.10%/yr for VMIAX.

Performance

VEMPX vs. VMIAX - Performance Comparison

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

Returns By Period

In the year-to-date period, VEMPX achieves a 15.71% return, which is significantly higher than VMIAX's 13.29% return. Over the past 10 years, VEMPX has outperformed VMIAX with an annualized return of 12.35%, while VMIAX has yielded a comparatively lower 10.29% annualized return.

VEMPX

• 1D: 1.66%
• 1M: 4.42%
• YTD: 15.71%
• 6M: 12.70%
• 1Y: 30.65%
• 3Y*: 19.15%
• 5Y*: 6.97%
• 10Y*: 12.35%

VMIAX

• 1D: -0.22%
• 1M: 2.78%
• YTD: 13.29%
• 6M: 11.97%
• 1Y: 24.70%
• 3Y*: 11.14%
• 5Y*: 7.59%
• 10Y*: 10.29%

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

VEMPX vs. VMIAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	15.71%	11.43%	15.50%	26.98%	-26.45%	12.48%	32.24%	28.06%	-9.35%	18.13%
VMIAX Vanguard Materials Index Fund Admiral Shares	13.29%	12.26%	0.45%	13.69%	-11.77%	27.15%	19.37%	23.59%	-17.38%	23.68%

Correlation

The correlation between VEMPX and VMIAX is 0.70, 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	0.70
Correlation (3Y) Calculated over the trailing 3-year period	0.77
Correlation (5Y) Calculated over the trailing 5-year period	0.78
Correlation (10Y) Calculated over the trailing 10-year period	0.78
Correlation (All Time) Calculated using the full available price history since Dec 13, 2010	0.81

The correlation between VEMPX and VMIAX shifts across timeframes, from 0.70 (1 year) to 0.81 (all time), reflecting how their relationship changes across market environments.

VEMPX vs. VMIAX - Sectors Allocation Comparison

Sectors	VEMPX	VMIAX
Technology	22.8%	0.1%
Industrials	19.3%	1.0%
Financial Services	14.0%	-
Healthcare	12.9%	0.5%
Consumer Cyclical	9.2%	8.3%
Real Estate	5.8%	-
Energy	4.4%	0.5%
Basic Materials	4.2%	90.2%
Communication Services	3.2%	-
Consumer Defensive	2.5%	0.0%
Utilities	1.9%	-

Return for Risk

VEMPX vs. VMIAX — Risk / Return Rank

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

VEMPX

VEMPX Risk / Return Rank: 47
VEMPX Sharpe Ratio Rank: 40
VEMPX Sortino Ratio Rank: 38
VEMPX Omega Ratio Rank: 36
VEMPX Calmar Ratio Rank: 66
VEMPX Martin Ratio Rank: 55

VMIAX

VMIAX Risk / Return Rank: 24
VMIAX Sharpe Ratio Rank: 24
VMIAX Sortino Ratio Rank: 23
VMIAX Omega Ratio Rank: 21
VMIAX Calmar Ratio Rank: 26
VMIAX Martin Ratio Rank: 25

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.

VEMPX vs. VMIAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX) and Vanguard Materials Index Fund Admiral Shares (VMIAX). 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.

	VEMPX	VMIAX	Difference
Sharpe ratio: Return per unit of total volatility	1.72	1.30	+0.41
Sortino ratio: Return per unit of downside risk	2.40	1.89	+0.51
Omega ratio: Gain probability vs. loss probability	1.29	1.23	+0.07
Calmar ratio: Return relative to maximum drawdown	2.98	1.79	+1.19
Martin ratio: Return relative to average drawdown	10.46	5.69	+4.77

VEMPX vs. VMIAX - Sharpe Ratio Comparison

The current VEMPX Sharpe Ratio is 1.72, which is higher than the VMIAX Sharpe Ratio of 1.30. The chart below compares the historical Sharpe Ratios of VEMPX and VMIAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

VEMPX vs. VMIAX - Drawdown Comparison

The maximum VEMPX drawdown since its inception was -41.62%, smaller than the maximum VMIAX drawdown of -62.17%. Use the drawdown chart below to compare losses from any high point for VEMPX and VMIAX.

Drawdown Indicators

	VEMPX	VMIAX	Difference
Max Drawdown Largest peak-to-trough decline	-41.62%	-62.17%	+20.55%
Max Drawdown (1Y) Largest decline over 1 year	-10.25%	-13.41%	+3.16%
Max Drawdown (3Y) Largest decline over 3 years	-26.83%	-23.21%	-3.62%
Max Drawdown (5Y) Largest decline over 5 years	-36.32%	-25.45%	-10.87%
Max Drawdown (10Y) Largest decline over 10 years	-41.62%	-41.02%	-0.60%
Current Drawdown Current decline from peak	-0.12%	-3.69%	+3.57%
Average Drawdown Average peak-to-trough decline	-7.95%	-9.62%	+1.67%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.91%	4.21%	-1.30%

Volatility

VEMPX vs. VMIAX - Volatility Comparison

Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX) and Vanguard Materials Index Fund Admiral Shares (VMIAX) have volatilities of 6.37% and 6.57%, 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.

Volatility by Period

	VEMPX	VMIAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.37%	6.57%	-0.20%
Volatility (6M) Calculated over the trailing 6-month period	13.33%	14.67%	-1.34%
Volatility (1Y) Calculated over the trailing 1-year period	17.81%	18.41%	-0.60%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.45%	19.76%	+2.69%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.41%	21.29%	+1.12%

VEMPX vs. VMIAX - Expense Ratio Comparison

VEMPX has a 0.04% expense ratio, which is lower than VMIAX'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

VEMPX vs. VMIAX - Dividend Comparison

VEMPX's dividend yield for the trailing twelve months is around 1.01%, less than VMIAX's 1.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	1.01%	1.15%	1.11%	1.27%	1.17%	1.15%	1.09%	1.32%	1.68%	1.27%	1.46%	1.39%
VMIAX Vanguard Materials Index Fund Admiral Shares	1.36%	1.55%	1.70%	1.72%	1.98%	1.33%	1.67%	1.94%	2.02%	1.63%	1.73%	2.31%

Frequently Asked Questions

Can I hold both VEMPX and VMIAX in my portfolio?

VEMPX and VMIAX have a correlation of 0.70, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VEMPX or VMIAX?

VMIAX has higher volatility (6.57%) compared to VEMPX (6.37%). In terms of maximum drawdown, VEMPX dropped -41.62% vs VMIAX's -62.17%.

Which has better risk-adjusted returns?

VEMPX currently has the higher Sharpe Ratio (1.72 vs 1.30), 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.