SKSEX vs. MOPIX

Last updated Jun 24, 2026

SKSEX (AMG GW&K Small Cap Value Fund) and MOPIX (MainStay WMC Small Companies Fund) are both Small Cap Blend Equities funds. Over the past 10 years, SKSEX returned 10.40%/yr vs 9.91%/yr for MOPIX. Their correlation of 0.89 suggests significant overlap in exposure. SKSEX charges 1.15%/yr vs 0.97%/yr for MOPIX.

Performance

SKSEX vs. MOPIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG GW&K Small Cap Value Fund (SKSEX) 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, SKSEX achieves a 24.85% return, which is significantly lower than MOPIX's 30.52% return. Both investments have delivered pretty close results over the past 10 years, with SKSEX having a 10.40% annualized return and MOPIX not far behind at 9.91%.

SKSEX

• 1D: 0.81%
• 1M: 5.62%
• YTD: 24.85%
• 6M: 22.78%
• 1Y: 29.67%
• 3Y*: 15.05%
• 5Y*: 7.21%
• 10Y*: 10.40%

MOPIX

• 1D: 0.87%
• 1M: 5.28%
• YTD: 30.52%
• 6M: 27.56%
• 1Y: 57.69%
• 3Y*: 23.88%
• 5Y*: 9.60%
• 10Y*: 9.91%

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

SKSEX vs. MOPIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SKSEX AMG GW&K Small Cap Value Fund	24.85%	-4.50%	10.60%	17.49%	-15.36%	33.22%	3.30%	38.26%	-18.98%	8.39%
MOPIX MainStay WMC Small Companies Fund	30.52%	12.69%	16.07%	10.97%	-19.00%	17.55%	10.04%	17.70%	-16.42%	15.68%

Correlation

The correlation between SKSEX and MOPIX is 0.88, 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	0.88
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.92
Correlation (All Time) Calculated using the full available price history since Jan 4, 1988	0.89

The correlation between SKSEX and MOPIX has been stable across timeframes, ranging from 0.88 to 0.93 - a consistent structural relationship.

Return for Risk

SKSEX vs. MOPIX — Risk / Return Rank

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

SKSEX

SKSEX Risk / Return Rank: 42
SKSEX Sharpe Ratio Rank: 36
SKSEX Sortino Ratio Rank: 30
SKSEX Omega Ratio Rank: 37
SKSEX Calmar Ratio Rank: 64
SKSEX Martin Ratio Rank: 40

MOPIX

MOPIX Risk / Return Rank: 93
MOPIX Sharpe Ratio Rank: 95
MOPIX Sortino Ratio Rank: 92
MOPIX Omega Ratio Rank: 84
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.

SKSEX vs. MOPIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG GW&K Small Cap Value Fund (SKSEX) 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.

	SKSEX	MOPIX	Difference
Sharpe ratio: Return per unit of total volatility	1.61	3.13	-1.52
Sortino ratio: Return per unit of downside risk	2.13	4.23	-2.10
Omega ratio: Gain probability vs. loss probability	1.30	1.52	-0.22
Calmar ratio: Return relative to maximum drawdown	2.94	6.12	-3.18
Martin ratio: Return relative to average drawdown	8.19	23.01	-14.81

SKSEX vs. MOPIX - Sharpe Ratio Comparison

The current SKSEX Sharpe Ratio is 1.61, which is lower than the MOPIX Sharpe Ratio of 3.13. The chart below compares the historical Sharpe Ratios of SKSEX 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

SKSEX vs. MOPIX - Drawdown Comparison

The maximum SKSEX drawdown since its inception was -65.26%, roughly equal to the maximum MOPIX drawdown of -68.08%. Use the drawdown chart below to compare losses from any high point for SKSEX and MOPIX.

Drawdown Indicators

	SKSEX	MOPIX	Difference
Max Drawdown Largest peak-to-trough decline	-65.26%	-68.08%	+2.82%
Max Drawdown (1Y) Largest decline over 1 year	-10.83%	-9.84%	-0.99%
Max Drawdown (3Y) Largest decline over 3 years	-26.39%	-26.99%	+0.60%
Max Drawdown (5Y) Largest decline over 5 years	-26.39%	-32.60%	+6.21%
Max Drawdown (10Y) Largest decline over 10 years	-49.36%	-48.01%	-1.35%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-9.22%	-9.10%	-0.12%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.87%	2.61%	+1.26%

Volatility

SKSEX vs. MOPIX - Volatility Comparison

The current volatility for AMG GW&K Small Cap Value Fund (SKSEX) is 5.28%, while MainStay WMC Small Companies Fund (MOPIX) has a volatility of 6.60%. This indicates that SKSEX experiences smaller price fluctuations and is considered to be less risky than MOPIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SKSEX	MOPIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.28%	6.60%	-1.32%
Volatility (6M) Calculated over the trailing 6-month period	12.95%	14.60%	-1.65%
Volatility (1Y) Calculated over the trailing 1-year period	19.76%	19.25%	+0.51%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.43%	22.89%	-1.46%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.52%	23.44%	+1.08%

SKSEX vs. MOPIX - Expense Ratio Comparison

SKSEX has a 1.15% expense ratio, which is higher than MOPIX's 0.97% expense ratio.

Dividends

SKSEX vs. MOPIX - Dividend Comparison

SKSEX has not paid dividends to shareholders, while MOPIX's dividend yield for the trailing twelve months is around 0.12%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
SKSEX AMG GW&K Small Cap Value Fund	0.00%	0.00%	8.62%	1.51%	1.69%	13.94%	43.15%	13.91%	14.98%	6.75%	0.02%	4.98%

Frequently Asked Questions

Can I hold both SKSEX and MOPIX in my portfolio?

SKSEX and MOPIX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SKSEX or MOPIX?

MOPIX has higher volatility (6.60%) compared to SKSEX (5.28%). In terms of maximum drawdown, SKSEX dropped -65.26% vs MOPIX's -68.08%.

Which has better risk-adjusted returns?

MOPIX currently has the higher Sharpe Ratio (3.13 vs 1.61), 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.