GMRAX vs. MOPIX

Last updated Jun 23, 2026

GMRAX (Nationwide Small Cap Index Fund) and MOPIX (MainStay WMC Small Companies Fund) are both Small Cap Blend Equities funds. Over the past 10 years, GMRAX returned 10.91%/yr vs 9.52%/yr for MOPIX. With a 0.95 correlation, they move nearly in lockstep. GMRAX charges 0.68%/yr vs 0.97%/yr for MOPIX.

Performance

GMRAX vs. MOPIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Nationwide Small Cap Index Fund (GMRAX) and MainStay WMC Small Companies Fund (MOPIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, GMRAX achieves a 20.34% return, which is significantly lower than MOPIX's 29.39% return. Over the past 10 years, GMRAX has outperformed MOPIX with an annualized return of 10.91%, while MOPIX has yielded a comparatively lower 9.52% annualized return.

GMRAX

• 1D: 2.12%
• 1M: 3.94%
• YTD: 20.34%
• 6M: 16.79%
• 1Y: 42.36%
• 3Y*: 17.42%
• 5Y*: 6.70%
• 10Y*: 10.91%

MOPIX

• 1D: 1.59%
• 1M: 4.37%
• YTD: 29.39%
• 6M: 26.00%
• 1Y: 58.23%
• 3Y*: 22.24%
• 5Y*: 10.04%
• 10Y*: 9.52%

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

GMRAX vs. MOPIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
GMRAX Nationwide Small Cap Index Fund	20.34%	12.26%	9.12%	17.56%	-20.82%	14.27%	19.59%	24.87%	-10.71%	14.21%
MOPIX MainStay WMC Small Companies Fund	29.39%	12.69%	16.07%	10.97%	-19.00%	17.55%	10.04%	17.70%	-16.42%	15.68%

Correlation

The correlation between GMRAX and MOPIX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.96
Correlation (All Time) Calculated using the full available price history since Jan 3, 2000	0.95

The correlation between GMRAX and MOPIX has been stable across timeframes, ranging from 0.94 to 0.96 - a consistent structural relationship.

Return for Risk

GMRAX vs. MOPIX — Risk / Return Rank

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

GMRAX

GMRAX Risk / Return Rank: 67
GMRAX Sharpe Ratio Rank: 63
GMRAX Sortino Ratio Rank: 59
GMRAX Omega Ratio Rank: 49
GMRAX Calmar Ratio Rank: 85
GMRAX Martin Ratio Rank: 77

MOPIX

MOPIX Risk / Return Rank: 92
MOPIX Sharpe Ratio Rank: 95
MOPIX Sortino Ratio Rank: 90
MOPIX Omega Ratio Rank: 82
MOPIX Calmar Ratio Rank: 96
MOPIX Martin Ratio Rank: 96

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.

GMRAX vs. MOPIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Nationwide Small Cap Index Fund (GMRAX) and MainStay WMC Small Companies Fund (MOPIX). 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.

	GMRAX	MOPIX	Difference
Sharpe ratio: Return per unit of total volatility	2.14	3.03	-0.89
Sortino ratio: Return per unit of downside risk	2.94	4.12	-1.18
Omega ratio: Gain probability vs. loss probability	1.35	1.50	-0.15
Calmar ratio: Return relative to maximum drawdown	3.83	5.93	-2.10
Martin ratio: Return relative to average drawdown	13.50	22.27	-8.77

GMRAX vs. MOPIX - Sharpe Ratio Comparison

The current GMRAX Sharpe Ratio is 2.14, which is comparable to the MOPIX Sharpe Ratio of 3.03. The chart below compares the historical Sharpe Ratios of GMRAX and MOPIX, 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

GMRAX vs. MOPIX - Drawdown Comparison

The maximum GMRAX drawdown since its inception was -59.36%, smaller than the maximum MOPIX drawdown of -68.08%. Use the drawdown chart below to compare losses from any high point for GMRAX and MOPIX.

Drawdown Indicators

	GMRAX	MOPIX	Difference
Max Drawdown Largest peak-to-trough decline	-59.36%	-68.08%	+8.72%
Max Drawdown (1Y) Largest decline over 1 year	-11.06%	-9.84%	-1.22%
Max Drawdown (3Y) Largest decline over 3 years	-27.67%	-26.99%	-0.68%
Max Drawdown (5Y) Largest decline over 5 years	-32.00%	-32.60%	+0.60%
Max Drawdown (10Y) Largest decline over 10 years	-41.78%	-48.01%	+6.23%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-12.57%	-9.10%	-3.47%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.13%	2.61%	+0.52%

Volatility

GMRAX vs. MOPIX - Volatility Comparison

Nationwide Small Cap Index Fund (GMRAX) and MainStay WMC Small Companies Fund (MOPIX) have volatilities of 6.80% and 6.93%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GMRAX	MOPIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.80%	6.93%	-0.13%
Volatility (6M) Calculated over the trailing 6-month period	14.38%	14.60%	-0.22%
Volatility (1Y) Calculated over the trailing 1-year period	19.73%	19.21%	+0.52%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.73%	22.91%	-0.18%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.60%	23.43%	+0.17%

GMRAX vs. MOPIX - Expense Ratio Comparison

GMRAX has a 0.68% expense ratio, which is lower than MOPIX's 0.97% expense ratio.

Dividends

GMRAX vs. MOPIX - Dividend Comparison

GMRAX's dividend yield for the trailing twelve months is around 2.09%, more than MOPIX's 0.12% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
GMRAX Nationwide Small Cap Index Fund	2.09%	2.45%	4.99%	0.52%	1.51%	6.81%	0.56%	7.38%	46.93%	17.82%	7.14%	12.55%
MOPIX MainStay WMC Small Companies Fund	0.12%	0.15%	0.39%	0.33%	2.34%	29.42%	0.00%	0.50%	18.09%	8.32%	0.59%	0.37%

Frequently Asked Questions

Can I hold both GMRAX and MOPIX in my portfolio?

With a correlation of 0.94, GMRAX and MOPIX 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, GMRAX or MOPIX?

MOPIX has higher volatility (6.93%) compared to GMRAX (6.80%). In terms of maximum drawdown, GMRAX dropped -59.36% vs MOPIX's -68.08%.

Which has better risk-adjusted returns?

MOPIX currently has the higher Sharpe Ratio (3.03 vs 2.14), 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.