VMIDX vs. VEMPX

Last updated Apr 2, 2026

Compare and contrast key facts about VALIC Company I Mid Cap Index Fund (VMIDX) and Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX).

VMIDX is managed by VALIC. It was launched on Oct 1, 1991. VEMPX is managed by Vanguard. It was launched on Jan 14, 2011.

Performance

VMIDX vs. VEMPX - Performance Comparison

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

VMIDX vs. VEMPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VMIDX VALIC Company I Mid Cap Index Fund	2.28%	-7.10%	13.57%	15.73%	-13.10%	24.39%	13.83%	25.59%	-17.06%	15.94%
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	-1.26%	11.43%	15.50%	26.98%	-26.45%	12.48%	32.24%	28.06%	-9.35%	18.13%

Returns By Period

In the year-to-date period, VMIDX achieves a 2.28% return, which is significantly higher than VEMPX's -1.26% return. Over the past 10 years, VMIDX has underperformed VEMPX with an annualized return of 7.94%, while VEMPX has yielded a comparatively higher 10.95% annualized return.

VMIDX

• 1D: 2.86%
• 1M: -6.39%
• YTD: 2.28%
• 6M: 3.52%
• 1Y: 15.99%
• 3Y*: 6.45%
• 5Y*: 3.23%
• 10Y*: 7.94%

VEMPX

• 1D: 3.43%
• 1M: -5.35%
• YTD: -1.26%
• 6M: -1.36%
• 1Y: 20.17%
• 3Y*: 15.09%
• 5Y*: 4.01%
• 10Y*: 10.95%

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

VMIDX vs. VEMPX - Expense Ratio Comparison

VMIDX has a 0.34% expense ratio, which is higher than VEMPX's 0.04% expense ratio.

VMIDX

VALIC Company I Mid Cap Index Fund

VEMPX

Vanguard Extended Market Index Fund Institutional Plus Shares

Return for Risk

VMIDX vs. VEMPX — Risk / Return Rank

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

VMIDX

VMIDX Risk / Return Rank: 30
VMIDX Sharpe Ratio Rank: 29
VMIDX Sortino Ratio Rank: 32
VMIDX Omega Ratio Rank: 29
VMIDX Calmar Ratio Rank: 28
VMIDX Martin Ratio Rank: 35

VEMPX

VEMPX Risk / Return Rank: 49
VEMPX Sharpe Ratio Rank: 42
VEMPX Sortino Ratio Rank: 47
VEMPX Omega Ratio Rank: 41
VEMPX Calmar Ratio Rank: 56
VEMPX Martin Ratio Rank: 58

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.

VMIDX vs. VEMPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for VALIC Company I Mid Cap Index Fund (VMIDX) and Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX). 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.

	VMIDX	VEMPX	Difference
Sharpe ratio Return per unit of total volatility	0.80	0.91	-0.11
Sortino ratio Return per unit of downside risk	1.27	1.41	-0.14
Omega ratio Gain probability vs. loss probability	1.17	1.19	-0.02
Calmar ratio Return relative to maximum drawdown	1.04	1.39	-0.35
Martin ratio Return relative to average drawdown	4.48	5.71	-1.24
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VMIDX vs. VEMPX - Sharpe Ratio Comparison

The current VMIDX Sharpe Ratio is 0.80, which is comparable to the VEMPX Sharpe Ratio of 0.91. The chart below compares the historical Sharpe Ratios of VMIDX and VEMPX, 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

	VMIDX	VEMPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.80	0.91	-0.11
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.15	0.18	-0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.37	0.49	-0.13
Sharpe Ratio (All Time) Calculated using the full available price history	0.16	0.50	-0.34

Correlation

The correlation between VMIDX and VEMPX is 0.95, 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

VMIDX vs. VEMPX - Dividend Comparison

VMIDX's dividend yield for the trailing twelve months is around 13.92%, more than VEMPX's 1.19% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VMIDX VALIC Company I Mid Cap Index Fund	13.92%	0.00%	5.05%	13.91%	10.75%	3.62%	8.68%	11.05%	1.31%	9.01%	0.00%	0.00%
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	1.19%	1.15%	1.11%	1.27%	1.17%	1.15%	1.09%	1.32%	1.68%	1.27%	1.46%	1.39%

Drawdowns

VMIDX vs. VEMPX - Drawdown Comparison

The maximum VMIDX drawdown since its inception was -67.05%, which is greater than VEMPX's maximum drawdown of -41.62%. Use the drawdown chart below to compare losses from any high point for VMIDX and VEMPX.

Drawdown Indicators

	VMIDX	VEMPX	Difference
Max Drawdown Largest peak-to-trough decline	-67.05%	-41.62%	-25.43%
Max Drawdown (1Y) Largest decline over 1 year	-14.18%	-14.63%	+0.45%
Max Drawdown (5Y) Largest decline over 5 years	-34.16%	-36.32%	+2.16%
Max Drawdown (10Y) Largest decline over 10 years	-41.76%	-41.62%	-0.14%
Current Drawdown Current decline from peak	-12.40%	-7.17%	-5.23%
Average Drawdown Average peak-to-trough decline	-17.03%	-8.04%	-8.99%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.29%	3.57%	-0.28%

Volatility

VMIDX vs. VEMPX - Volatility Comparison

The current volatility for VALIC Company I Mid Cap Index Fund (VMIDX) is 6.26%, while Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX) has a volatility of 7.02%. This indicates that VMIDX experiences smaller price fluctuations and is considered to be less risky than VEMPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMIDX	VEMPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.26%	7.02%	-0.76%
Volatility (6M) Calculated over the trailing 6-month period	11.66%	13.51%	-1.85%
Volatility (1Y) Calculated over the trailing 1-year period	20.98%	22.99%	-2.01%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.08%	22.38%	-1.30%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.79%	22.33%	-0.54%