VMCIX vs. SPY

Last updated Apr 1, 2026

Compare and contrast key facts about Vanguard Mid-Cap Index Fund Institutional Shares (VMCIX) and State Street SPDR S&P 500 ETF (SPY).

VMCIX is managed by Vanguard. It was launched on May 21, 1998. SPY is a passively managed fund by State Street that tracks the performance of the S&P 500 Index. It was launched on Jan 22, 1993.

Performance

VMCIX vs. SPY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Mid-Cap Index Fund Institutional Shares (VMCIX) and State Street SPDR S&P 500 ETF (SPY). The values are adjusted to include any dividend payments, if applicable.

VMCIX vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VMCIX Vanguard Mid-Cap Index Fund Institutional Shares	-2.79%	11.67%	14.68%	16.54%	-18.70%	24.53%	18.20%	31.04%	-9.25%	19.30%
SPY State Street SPDR S&P 500 ETF	-4.37%	17.72%	24.89%	26.18%	-18.18%	28.73%	18.33%	31.22%	-4.57%	21.71%

Returns By Period

In the year-to-date period, VMCIX achieves a -2.79% return, which is significantly higher than SPY's -4.37% return. Over the past 10 years, VMCIX has underperformed SPY with an annualized return of 10.43%, while SPY has yielded a comparatively higher 13.98% annualized return.

VMCIX

• 1D: -0.66%
• 1M: -7.87%
• YTD: -2.79%
• 6M: -3.58%
• 1Y: 10.31%
• 3Y*: 11.79%
• 5Y*: 6.51%
• 10Y*: 10.43%

SPY

• 1D: 2.91%
• 1M: -4.94%
• YTD: -4.37%
• 6M: -1.82%
• 1Y: 17.59%
• 3Y*: 18.19%
• 5Y*: 11.69%
• 10Y*: 13.98%

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

VMCIX vs. SPY - Expense Ratio Comparison

VMCIX has a 0.04% expense ratio, which is lower than SPY's 0.09% 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%.

SPY

State Street SPDR S&P 500 ETF

VMCIX

Vanguard Mid-Cap Index Fund Institutional Shares

Return for Risk

VMCIX vs. SPY — Risk / Return Rank

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

VMCIX

VMCIX Risk / Return Rank: 28
VMCIX Sharpe Ratio Rank: 27
VMCIX Sortino Ratio Rank: 27
VMCIX Omega Ratio Rank: 28
VMCIX Calmar Ratio Rank: 25
VMCIX Martin Ratio Rank: 32

SPY

SPY Risk / Return Rank: 64
SPY Sharpe Ratio Rank: 56
SPY Sortino Ratio Rank: 60
SPY Omega Ratio Rank: 65
SPY Calmar Ratio Rank: 65
SPY 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.

VMCIX vs. SPY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Mid-Cap Index Fund Institutional Shares (VMCIX) and State Street SPDR S&P 500 ETF (SPY). 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.

	VMCIX	SPY	Difference
Sharpe ratio Return per unit of total volatility	0.63	0.93	-0.30
Sortino ratio Return per unit of downside risk	0.99	1.45	-0.46
Omega ratio Gain probability vs. loss probability	1.14	1.22	-0.08
Calmar ratio Return relative to maximum drawdown	0.73	1.53	-0.79
Martin ratio Return relative to average drawdown	3.40	7.30	-3.90
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VMCIX vs. SPY - Sharpe Ratio Comparison

The current VMCIX Sharpe Ratio is 0.63, which is lower than the SPY Sharpe Ratio of 0.93. The chart below compares the historical Sharpe Ratios of VMCIX and SPY, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	VMCIX	SPY	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.63	0.93	-0.30
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.37	0.69	-0.32
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.55	0.78	-0.23
Sharpe Ratio (All Time) Calculated using the full available price history	0.47	0.56	-0.09

Correlation

The correlation between VMCIX and SPY is 0.90, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

VMCIX vs. SPY - Dividend Comparison

VMCIX's dividend yield for the trailing twelve months is around 1.54%, more than SPY's 1.14% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VMCIX Vanguard Mid-Cap Index Fund Institutional Shares	1.54%	1.52%	1.49%	1.51%	1.60%	1.12%	1.45%	1.48%	1.83%	1.36%	1.46%	1.48%
SPY State Street SPDR S&P 500 ETF	1.14%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%

Drawdowns

VMCIX vs. SPY - Drawdown Comparison

The maximum VMCIX drawdown since its inception was -58.86%, which is greater than SPY's maximum drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for VMCIX and SPY.

Drawdown Indicators

	VMCIX	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-58.86%	-55.19%	-3.67%
Max Drawdown (1Y) Largest decline over 1 year	-12.77%	-12.05%	-0.72%
Max Drawdown (5Y) Largest decline over 5 years	-27.54%	-24.50%	-3.04%
Max Drawdown (10Y) Largest decline over 10 years	-39.30%	-33.72%	-5.58%
Current Drawdown Current decline from peak	-8.13%	-6.24%	-1.89%
Average Drawdown Average peak-to-trough decline	-8.02%	-9.09%	+1.07%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.75%	2.52%	+0.23%

Volatility

VMCIX vs. SPY - Volatility Comparison

The current volatility for Vanguard Mid-Cap Index Fund Institutional Shares (VMCIX) is 4.23%, while State Street SPDR S&P 500 ETF (SPY) has a volatility of 5.31%. This indicates that VMCIX experiences smaller price fluctuations and is considered to be less risky than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMCIX	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.23%	5.31%	-1.08%
Volatility (6M) Calculated over the trailing 6-month period	9.43%	9.47%	-0.04%
Volatility (1Y) Calculated over the trailing 1-year period	17.58%	19.05%	-1.47%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.63%	17.06%	+0.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.90%	17.92%	+0.98%