NAESX vs. VIMSX

Last updated Jun 4, 2026

NAESX (Vanguard Small Cap Index Fund) and VIMSX (Vanguard Mid Cap Index Fund) are both mutual funds - NAESX is a Small Cap Blend Equities fund managed by Vanguard, while VIMSX is a Mid Cap Blend Equities fund managed by Vanguard. Over the past 10 years, NAESX returned 11.23%/yr vs 11.40%/yr for VIMSX. Their correlation of 0.95 suggests significant overlap in exposure. Both charge a 0.17% expense ratio.

Performance

NAESX vs. VIMSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Small Cap Index Fund (NAESX) and Vanguard Mid Cap Index Fund (VIMSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NAESX achieves a 14.87% return, which is significantly higher than VIMSX's 10.48% return. Both investments have delivered pretty close results over the past 10 years, with NAESX having a 11.23% annualized return and VIMSX not far ahead at 11.40%.

NAESX

• 1D: 0.79%
• 1M: 4.22%
• YTD: 14.87%
• 6M: 14.82%
• 1Y: 29.50%
• 3Y*: 17.17%
• 5Y*: 7.21%
• 10Y*: 11.23%

VIMSX

• 1D: 0.90%
• 1M: 3.66%
• YTD: 10.48%
• 6M: 10.13%
• 1Y: 18.59%
• 3Y*: 16.52%
• 5Y*: 7.88%
• 10Y*: 11.40%

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

NAESX vs. VIMSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NAESX Vanguard Small Cap Index Fund	14.87%	8.71%	12.83%	19.35%	-17.71%	17.60%	18.92%	27.22%	-9.44%	16.10%
VIMSX Vanguard Mid Cap Index Fund	10.48%	11.08%	14.52%	16.40%	-18.80%	24.36%	18.04%	30.85%	-9.35%	19.12%

Correlation

The correlation between NAESX and VIMSX is 0.93, 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	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since May 22, 1998	0.95

The correlation between NAESX and VIMSX has been stable across timeframes, ranging from 0.93 to 0.96 - a consistent structural relationship.

Return for Risk

NAESX vs. VIMSX — Risk / Return Rank

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

NAESX

NAESX Risk / Return Rank: 54
NAESX Sharpe Ratio Rank: 43
NAESX Sortino Ratio Rank: 43
NAESX Omega Ratio Rank: 39
NAESX Calmar Ratio Rank: 77
NAESX Martin Ratio Rank: 67

VIMSX

VIMSX Risk / Return Rank: 35
VIMSX Sharpe Ratio Rank: 31
VIMSX Sortino Ratio Rank: 30
VIMSX Omega Ratio Rank: 29
VIMSX Calmar Ratio Rank: 41
VIMSX Martin Ratio Rank: 44

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.

NAESX vs. VIMSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Small Cap Index Fund (NAESX) and Vanguard Mid Cap Index Fund (VIMSX). 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.

	NAESX	VIMSX	Difference
Sharpe ratio: Return per unit of total volatility	1.93	1.60	+0.33
Sortino ratio: Return per unit of downside risk	2.73	2.29	+0.44
Omega ratio: Gain probability vs. loss probability	1.33	1.28	+0.05
Calmar ratio: Return relative to maximum drawdown	3.49	2.42	+1.07
Martin ratio: Return relative to average drawdown	12.88	9.19	+3.69
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

NAESX vs. VIMSX - Sharpe Ratio Comparison

The current NAESX Sharpe Ratio is 1.93, which is comparable to the VIMSX Sharpe Ratio of 1.60. The chart below compares the historical Sharpe Ratios of NAESX and VIMSX, 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

	NAESX	VIMSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.93	1.60	+0.33
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.35	0.45	-0.10
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.52	0.60	-0.08
Sharpe Ratio (All Time) Calculated using the full available price history	0.43	0.48	-0.05

Drawdowns

NAESX vs. VIMSX - Drawdown Comparison

The maximum NAESX drawdown since its inception was -59.77%, roughly equal to the maximum VIMSX drawdown of -58.96%. Use the drawdown chart below to compare losses from any high point for NAESX and VIMSX.

Drawdown Indicators

	NAESX	VIMSX	Difference
Max Drawdown Largest peak-to-trough decline	-59.77%	-58.96%	-0.81%
Max Drawdown (1Y) Largest decline over 1 year	-8.98%	-8.14%	-0.84%
Max Drawdown (3Y) Largest decline over 3 years	-25.28%	-19.31%	-5.97%
Max Drawdown (5Y) Largest decline over 5 years	-28.19%	-27.63%	-0.56%
Max Drawdown (10Y) Largest decline over 10 years	-41.82%	-39.29%	-2.53%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-11.82%	-8.07%	-3.75%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.43%	2.14%	+0.29%

Volatility

NAESX vs. VIMSX - Volatility Comparison

Vanguard Small Cap Index Fund (NAESX) has a higher volatility of 4.41% compared to Vanguard Mid Cap Index Fund (VIMSX) at 2.97%. This indicates that NAESX's price experiences larger fluctuations and is considered to be riskier than VIMSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NAESX	VIMSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.41%	2.97%	+1.44%
Volatility (6M) Calculated over the trailing 6-month period	11.72%	9.28%	+2.44%
Volatility (1Y) Calculated over the trailing 1-year period	16.27%	12.30%	+3.97%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.72%	17.64%	+3.08%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.60%	18.93%	+2.67%

NAESX vs. VIMSX - Expense Ratio Comparison

Both NAESX and VIMSX have an expense ratio of 0.17%, making them cost-effective options compared to the broader market, where average expense ratios typically range from 0.3% to 0.9%.

Dividends

NAESX vs. VIMSX - Dividend Comparison

NAESX's dividend yield for the trailing twelve months is around 1.08%, less than VIMSX's 1.23% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NAESX Vanguard Small Cap Index Fund	1.08%	1.22%	1.19%	1.43%	1.41%	1.12%	1.05%	1.27%	1.53%	1.24%	1.39%	1.35%
VIMSX Vanguard Mid Cap Index Fund	1.23%	1.03%	1.37%	1.39%	1.46%	1.00%	1.34%	1.37%	1.68%	1.24%	1.34%	1.33%

Frequently Asked Questions

Can I hold both NAESX and VIMSX in my portfolio?

With a correlation of 0.93, NAESX and VIMSX 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, NAESX or VIMSX?

NAESX has higher volatility (4.41%) compared to VIMSX (2.97%). In terms of maximum drawdown, NAESX dropped -59.77% vs VIMSX's -58.96%.

Which has better risk-adjusted returns?

NAESX currently has the higher Sharpe Ratio (1.93 vs 1.60), 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.