VMCPX vs. VIEIX

Last updated Jul 14, 2026

VMCPX (Vanguard Mid-Cap Index Fund Institutional Plus Shares) and VIEIX (Vanguard Extended Market Index Fund Institutional Shares) are both Mid Cap Blend Equities funds from Vanguard. Over the past 10 years, VMCPX returned 11.49%/yr vs 11.99%/yr for VIEIX. With a 0.96 correlation, they move nearly in lockstep. VMCPX charges 0.03%/yr vs 0.04%/yr for VIEIX.

Performance

VMCPX vs. VIEIX - Performance Comparison

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

Returns By Period

In the year-to-date period, VMCPX achieves a 12.35% return, which is significantly lower than VIEIX's 16.05% return. Both investments have delivered pretty close results over the past 10 years, with VMCPX having a 11.49% annualized return and VIEIX not far ahead at 11.99%.

VMCPX

• 1D: 0.17%
• 1M: 1.72%
• 6M: 8.97%
• YTD: 12.35%
• 1Y: 16.36%
• 3Y*: 14.86%
• 5Y*: 7.87%
• 10Y*: 11.49%

VIEIX

• 1D: -0.56%
• 1M: 1.42%
• 6M: 10.64%
• YTD: 16.05%
• 1Y: 24.55%
• 3Y*: 18.16%
• 5Y*: 6.39%
• 10Y*: 11.99%

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

VMCPX vs. VIEIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VMCPX Vanguard Mid-Cap Index Fund Institutional Plus Shares	12.35%	11.70%	14.68%	16.55%	-18.68%	24.54%	18.20%	31.06%	-9.23%	19.28%
VIEIX Vanguard Extended Market Index Fund Institutional Shares	16.05%	11.42%	15.49%	26.97%	-26.46%	12.46%	32.24%	28.05%	-9.36%	18.12%

Correlation

The correlation between VMCPX and VIEIX is 0.91, 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	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Dec 13, 2010	0.96

The correlation between VMCPX and VIEIX has been stable across timeframes, ranging from 0.91 to 0.96 - a consistent structural relationship.

VMCPX vs. VIEIX - Sectors Allocation Comparison

Sectors	VMCPX	VIEIX
Technology	21.7%	22.8%
Industrials	17.3%	19.3%
Financial Services	12.5%	14.0%
Consumer Cyclical	8.6%	9.2%
Utilities	7.9%	1.9%
Energy	7.9%	4.4%
Healthcare	7.5%	12.9%
Real Estate	5.1%	5.8%
Consumer Defensive	4.7%	2.5%
Basic Materials	4.4%	4.2%
Communication Services	2.2%	3.2%

Return for Risk

VMCPX vs. VIEIX — Risk / Return Rank

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

VMCPX

VMCPX Risk / Return Rank: 35
VMCPX Sharpe Ratio Rank: 32
VMCPX Sortino Ratio Rank: 32
VMCPX Omega Ratio Rank: 30
VMCPX Calmar Ratio Rank: 40
VMCPX Martin Ratio Rank: 43

VIEIX

VIEIX Risk / Return Rank: 41
VIEIX Sharpe Ratio Rank: 35
VIEIX Sortino Ratio Rank: 35
VIEIX Omega Ratio Rank: 32
VIEIX Calmar Ratio Rank: 54
VIEIX Martin Ratio Rank: 48

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.

VMCPX vs. VIEIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Mid-Cap Index Fund Institutional Plus Shares (VMCPX) and Vanguard Extended Market Index Fund Institutional Shares (VIEIX). 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.

	VMCPX	VIEIX	Difference
Sharpe ratio: Return per unit of total volatility	1.23	1.31	-0.08
Sortino ratio: Return per unit of downside risk	1.79	1.90	-0.11
Omega ratio: Gain probability vs. loss probability	1.22	1.23	-0.01
Calmar ratio: Return relative to maximum drawdown	1.93	2.27	-0.34
Martin ratio: Return relative to average drawdown	7.26	7.96	-0.70

VMCPX vs. VIEIX - Sharpe Ratio Comparison

The current VMCPX Sharpe Ratio is 1.23, which is comparable to the VIEIX Sharpe Ratio of 1.31. The chart below compares the historical Sharpe Ratios of VMCPX and VIEIX, 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

VMCPX vs. VIEIX - Drawdown Comparison

The maximum VMCPX drawdown since its inception was -39.30%, smaller than the maximum VIEIX drawdown of -58.03%. Use the drawdown chart below to compare losses from any high point for VMCPX and VIEIX.

Drawdown Indicators

	VMCPX	VIEIX	Difference
Max Drawdown Largest peak-to-trough decline	-39.30%	-58.03%	+18.73%
Max Drawdown (1Y) Largest decline over 1 year	-8.13%	-10.25%	+2.12%
Max Drawdown (3Y) Largest decline over 3 years	-18.93%	-26.84%	+7.91%
Max Drawdown (5Y) Largest decline over 5 years	-27.54%	-36.32%	+8.78%
Max Drawdown (10Y) Largest decline over 10 years	-39.30%	-41.62%	+2.32%
Current Drawdown Current decline from peak	0.00%	-1.99%	+1.99%
Average Drawdown Average peak-to-trough decline	-5.19%	-13.79%	+8.60%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.16%	2.93%	-0.77%

Volatility

VMCPX vs. VIEIX - Volatility Comparison

The current volatility for Vanguard Mid-Cap Index Fund Institutional Plus Shares (VMCPX) is 3.80%, while Vanguard Extended Market Index Fund Institutional Shares (VIEIX) has a volatility of 5.16%. This indicates that VMCPX experiences smaller price fluctuations and is considered to be less risky than VIEIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMCPX	VIEIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.80%	5.16%	-1.36%
Volatility (6M) Calculated over the trailing 6-month period	9.67%	13.25%	-3.58%
Volatility (1Y) Calculated over the trailing 1-year period	12.72%	17.80%	-5.08%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.68%	22.45%	-4.77%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.84%	22.33%	-3.49%

VMCPX vs. VIEIX - Expense Ratio Comparison

VMCPX has a 0.03% expense ratio, which is lower than VIEIX's 0.04% 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

VMCPX vs. VIEIX - Dividend Comparison

VMCPX's dividend yield for the trailing twelve months is around 1.33%, more than VIEIX's 1.02% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VIEIX Vanguard Extended Market Index Fund Institutional Shares	1.02%	1.14%	1.10%	1.26%	1.16%	1.14%	1.08%	1.31%	1.67%	1.27%	1.45%	1.37%
VMCPX Vanguard Mid-Cap Index Fund Institutional Plus Shares	1.33%	1.53%	1.50%	1.52%	1.61%	1.13%	1.45%	1.49%	1.84%	1.37%	1.47%	1.50%

Frequently Asked Questions

Can I hold both VMCPX and VIEIX in my portfolio?

With a correlation of 0.91, VMCPX and VIEIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, VMCPX or VIEIX?

VIEIX has higher volatility (5.16%) compared to VMCPX (3.80%). In terms of maximum drawdown, VMCPX dropped -39.30% vs VIEIX's -58.03%.

Which has better risk-adjusted returns?

VIEIX currently has the higher Sharpe Ratio (1.31 vs 1.23), 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.