VIEIX vs. RERGX

Last updated Jun 14, 2026

VIEIX (Vanguard Extended Market Index Fund Institutional Shares) and RERGX (American Funds EUPAC Fund Class R-6) are both mutual funds - VIEIX is a Mid Cap Blend Equities fund managed by Vanguard, while RERGX is a Foreign Large Cap Equities fund actively managed by American Funds. Over the past 10 years, VIEIX returned 12.24%/yr vs 9.31%/yr for RERGX. A 0.75 correlation means they provide meaningful diversification when combined. VIEIX charges 0.05%/yr vs 0.47%/yr for RERGX.

Performance

VIEIX vs. RERGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Extended Market Index Fund Institutional Shares (VIEIX) and American Funds EUPAC Fund Class R-6 (RERGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VIEIX achieves a 13.86% return, which is significantly higher than RERGX's 9.59% return. Over the past 10 years, VIEIX has outperformed RERGX with an annualized return of 12.24%, while RERGX has yielded a comparatively lower 9.31% annualized return.

VIEIX

• 1D: 2.96%
• 1M: 5.63%
• YTD: 13.86%
• 6M: 11.71%
• 1Y: 29.57%
• 3Y*: 18.99%
• 5Y*: 6.07%
• 10Y*: 12.24%

RERGX

• 1D: 3.38%
• 1M: 3.35%
• YTD: 9.59%
• 6M: 11.78%
• 1Y: 25.32%
• 3Y*: 14.88%
• 5Y*: 4.58%
• 10Y*: 9.31%

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

VIEIX vs. RERGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VIEIX Vanguard Extended Market Index Fund Institutional Shares	13.86%	11.42%	15.49%	26.97%	-26.46%	12.46%	32.24%	28.05%	-9.36%	18.12%
RERGX American Funds EUPAC Fund Class R-6	9.59%	29.34%	3.00%	16.11%	-22.77%	2.84%	25.27%	27.40%	-17.33%	31.19%

Correlation

The correlation between VIEIX and RERGX is 0.72, 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	0.72
Correlation (3Y) Calculated over the trailing 3-year period	0.73
Correlation (5Y) Calculated over the trailing 5-year period	0.77
Correlation (10Y) Calculated over the trailing 10-year period	0.74
Correlation (All Time) Calculated using the full available price history since Jan 4, 2010	0.75

The correlation between VIEIX and RERGX has been stable across timeframes, ranging from 0.72 to 0.77 - a consistent structural relationship.

Return for Risk

VIEIX vs. RERGX — Risk / Return Rank

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

VIEIX

VIEIX Risk / Return Rank: 51
VIEIX Sharpe Ratio Rank: 44
VIEIX Sortino Ratio Rank: 43
VIEIX Omega Ratio Rank: 39
VIEIX Calmar Ratio Rank: 70
VIEIX Martin Ratio Rank: 58

RERGX

RERGX Risk / Return Rank: 40
RERGX Sharpe Ratio Rank: 41
RERGX Sortino Ratio Rank: 40
RERGX Omega Ratio Rank: 43
RERGX Calmar Ratio Rank: 38
RERGX Martin Ratio Rank: 40

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.

VIEIX vs. RERGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Extended Market Index Fund Institutional Shares (VIEIX) and American Funds EUPAC Fund Class R-6 (RERGX). 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.

	VIEIX	RERGX	Difference
Sharpe ratio: Return per unit of total volatility	1.53	1.47	+0.06
Sortino ratio: Return per unit of downside risk	2.16	2.09	+0.07
Omega ratio: Gain probability vs. loss probability	1.26	1.28	-0.01
Calmar ratio: Return relative to maximum drawdown	2.66	1.92	+0.73
Martin ratio: Return relative to average drawdown	9.32	7.13	+2.19

VIEIX vs. RERGX - Sharpe Ratio Comparison

The current VIEIX Sharpe Ratio is 1.53, which is comparable to the RERGX Sharpe Ratio of 1.47. The chart below compares the historical Sharpe Ratios of VIEIX and RERGX, 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

VIEIX vs. RERGX - Drawdown Comparison

The maximum VIEIX drawdown since its inception was -58.03%, which is greater than RERGX's maximum drawdown of -37.30%. Use the drawdown chart below to compare losses from any high point for VIEIX and RERGX.

Drawdown Indicators

	VIEIX	RERGX	Difference
Max Drawdown Largest peak-to-trough decline	-58.03%	-37.30%	-20.73%
Max Drawdown (1Y) Largest decline over 1 year	-10.25%	-12.52%	+2.27%
Max Drawdown (3Y) Largest decline over 3 years	-26.84%	-15.62%	-11.22%
Max Drawdown (5Y) Largest decline over 5 years	-36.32%	-37.30%	+0.98%
Max Drawdown (10Y) Largest decline over 10 years	-41.62%	-37.30%	-4.32%
Current Drawdown Current decline from peak	-1.04%	-2.44%	+1.40%
Average Drawdown Average peak-to-trough decline	-13.82%	-9.20%	-4.62%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.92%	3.37%	-0.45%

Volatility

VIEIX vs. RERGX - Volatility Comparison

The current volatility for Vanguard Extended Market Index Fund Institutional Shares (VIEIX) is 6.48%, while American Funds EUPAC Fund Class R-6 (RERGX) has a volatility of 7.18%. This indicates that VIEIX experiences smaller price fluctuations and is considered to be less risky than RERGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VIEIX	RERGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.48%	7.18%	-0.70%
Volatility (6M) Calculated over the trailing 6-month period	13.35%	14.16%	-0.81%
Volatility (1Y) Calculated over the trailing 1-year period	17.81%	16.42%	+1.39%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.43%	16.86%	+5.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.40%	17.01%	+5.39%

VIEIX vs. RERGX - Expense Ratio Comparison

VIEIX has a 0.05% expense ratio, which is lower than RERGX's 0.47% expense ratio.

Dividends

VIEIX vs. RERGX - Dividend Comparison

VIEIX's dividend yield for the trailing twelve months is around 1.02%, less than RERGX's 10.22% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
RERGX American Funds EUPAC Fund Class R-6	10.22%	13.95%	4.96%	3.95%	2.02%	10.19%	0.41%	3.14%	3.17%	4.99%	1.64%	3.43%
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%

Frequently Asked Questions

Can I hold both VIEIX and RERGX in my portfolio?

VIEIX and RERGX have a correlation of 0.72, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VIEIX or RERGX?

RERGX has higher volatility (7.18%) compared to VIEIX (6.48%). In terms of maximum drawdown, VIEIX dropped -58.03% vs RERGX's -37.30%.

Which has better risk-adjusted returns?

VIEIX currently has the higher Sharpe Ratio (1.53 vs 1.47), 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.