OSSIX vs. MOPIX

Last updated Jun 24, 2026

OSSIX (Invesco Main Street Small Cap Fund) and MOPIX (MainStay WMC Small Companies Fund) are both Small Cap Blend Equities funds. Over the past 10 years, OSSIX returned 12.31%/yr vs 9.91%/yr for MOPIX. Their correlation of 0.93 suggests significant overlap in exposure. OSSIX charges 0.68%/yr vs 0.97%/yr for MOPIX.

Performance

OSSIX vs. MOPIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco Main Street Small Cap Fund (OSSIX) 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, OSSIX achieves a 17.38% return, which is significantly lower than MOPIX's 30.52% return. Over the past 10 years, OSSIX has outperformed MOPIX with an annualized return of 12.31%, while MOPIX has yielded a comparatively lower 9.91% annualized return.

OSSIX

• 1D: 0.46%
• 1M: 5.33%
• YTD: 17.38%
• 6M: 14.68%
• 1Y: 28.37%
• 3Y*: 17.44%
• 5Y*: 8.34%
• 10Y*: 12.31%

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)

OSSIX vs. MOPIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OSSIX Invesco Main Street Small Cap Fund	17.38%	8.92%	12.82%	17.96%	-15.75%	22.20%	20.31%	26.22%	-10.55%	14.08%
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 OSSIX and MOPIX is 0.80, 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	0.80
Correlation (3Y) Calculated over the trailing 3-year period	0.88
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jan 2, 2014	0.93

The correlation between OSSIX and MOPIX shifts across timeframes, from 0.80 (1 year) to 0.93 (all time), reflecting how their relationship changes across market environments.

Return for Risk

OSSIX vs. MOPIX — Risk / Return Rank

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

OSSIX

OSSIX Risk / Return Rank: 47
OSSIX Sharpe Ratio Rank: 44
OSSIX Sortino Ratio Rank: 47
OSSIX Omega Ratio Rank: 38
OSSIX Calmar Ratio Rank: 53
OSSIX Martin Ratio Rank: 53

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.

OSSIX vs. MOPIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Main Street Small Cap Fund (OSSIX) 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.

	OSSIX	MOPIX	Difference
Sharpe ratio: Return per unit of total volatility	1.81	3.13	-1.32
Sortino ratio: Return per unit of downside risk	2.67	4.23	-1.56
Omega ratio: Gain probability vs. loss probability	1.31	1.52	-0.21
Calmar ratio: Return relative to maximum drawdown	2.68	6.12	-3.44
Martin ratio: Return relative to average drawdown	10.18	23.01	-12.83

OSSIX vs. MOPIX - Sharpe Ratio Comparison

The current OSSIX Sharpe Ratio is 1.81, which is lower than the MOPIX Sharpe Ratio of 3.13. The chart below compares the historical Sharpe Ratios of OSSIX 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

OSSIX vs. MOPIX - Drawdown Comparison

The maximum OSSIX drawdown since its inception was -42.18%, smaller than the maximum MOPIX drawdown of -68.08%. Use the drawdown chart below to compare losses from any high point for OSSIX and MOPIX.

Drawdown Indicators

	OSSIX	MOPIX	Difference
Max Drawdown Largest peak-to-trough decline	-42.18%	-68.08%	+25.90%
Max Drawdown (1Y) Largest decline over 1 year	-12.49%	-9.84%	-2.65%
Max Drawdown (3Y) Largest decline over 3 years	-24.63%	-26.99%	+2.36%
Max Drawdown (5Y) Largest decline over 5 years	-28.13%	-32.60%	+4.47%
Max Drawdown (10Y) Largest decline over 10 years	-42.18%	-48.01%	+5.83%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-7.49%	-9.10%	+1.61%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.19%	2.61%	+0.58%

Volatility

OSSIX vs. MOPIX - Volatility Comparison

The current volatility for Invesco Main Street Small Cap Fund (OSSIX) is 5.51%, while MainStay WMC Small Companies Fund (MOPIX) has a volatility of 6.60%. This indicates that OSSIX 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

	OSSIX	MOPIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.51%	6.60%	-1.09%
Volatility (6M) Calculated over the trailing 6-month period	13.88%	14.60%	-0.72%
Volatility (1Y) Calculated over the trailing 1-year period	18.55%	19.25%	-0.70%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.11%	22.89%	-1.78%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.45%	23.44%	-0.99%

OSSIX vs. MOPIX - Expense Ratio Comparison

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

Dividends

OSSIX vs. MOPIX - Dividend Comparison

OSSIX's dividend yield for the trailing twelve months is around 6.91%, more than MOPIX's 0.12% yield.

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%
OSSIX Invesco Main Street Small Cap Fund	6.91%	8.11%	6.24%	0.64%	0.61%	7.71%	0.85%	0.30%	8.81%	5.92%	0.58%	0.75%

Frequently Asked Questions

Can I hold both OSSIX and MOPIX in my portfolio?

OSSIX and MOPIX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OSSIX or MOPIX?

MOPIX has higher volatility (6.60%) compared to OSSIX (5.51%). In terms of maximum drawdown, OSSIX dropped -42.18% vs MOPIX's -68.08%.

Which has better risk-adjusted returns?

MOPIX currently has the higher Sharpe Ratio (3.13 vs 1.81), 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.