OPCAX vs. MSIGX

Last updated Jun 4, 2026

OPCAX (Invesco California Municipal Fund) and MSIGX (Invesco Main Street Fund) are both mutual funds - OPCAX is a Municipal Bonds fund managed by Invesco, while MSIGX is a Large Cap Blend Equities fund managed by Invesco. Over the past 10 years, OPCAX returned 3.05%/yr vs 11.85%/yr for MSIGX. At a 0.01 correlation, their price movements are largely independent. OPCAX charges 0.75%/yr vs 0.82%/yr for MSIGX.

Performance

OPCAX vs. MSIGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco California Municipal Fund (OPCAX) and Invesco Main Street Fund (MSIGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OPCAX achieves a 1.71% return, which is significantly lower than MSIGX's 6.01% return. Over the past 10 years, OPCAX has underperformed MSIGX with an annualized return of 3.05%, while MSIGX has yielded a comparatively higher 11.85% annualized return.

OPCAX

• 1D: 0.25%
• 1M: 1.24%
• YTD: 1.71%
• 6M: 2.06%
• 1Y: 7.06%
• 3Y*: 3.70%
• 5Y*: 0.42%
• 10Y*: 3.05%

MSIGX

• 1D: 0.03%
• 1M: 3.56%
• YTD: 6.01%
• 6M: 6.04%
• 1Y: 20.28%
• 3Y*: 18.12%
• 5Y*: 10.75%
• 10Y*: 11.85%

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

OPCAX vs. MSIGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OPCAX Invesco California Municipal Fund	1.71%	2.59%	2.86%	6.86%	-12.10%	3.56%	6.07%	10.31%	6.59%	4.47%
MSIGX Invesco Main Street Fund	6.01%	16.02%	23.66%	23.06%	-20.21%	27.37%	14.41%	22.49%	-8.25%	16.79%

Correlation

The correlation between OPCAX and MSIGX is 0.20, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.20
Correlation (3Y) Calculated over the trailing 3-year period	0.16
Correlation (5Y) Calculated over the trailing 5-year period	0.12
Correlation (10Y) Calculated over the trailing 10-year period	0.04
Correlation (All Time) Calculated using the full available price history since Nov 2, 1988	0.01

The correlation between OPCAX and MSIGX shifts across timeframes, from 0.01 (all time) to 0.20 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

OPCAX vs. MSIGX — Risk / Return Rank

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

OPCAX

OPCAX Risk / Return Rank: 48
OPCAX Sharpe Ratio Rank: 46
OPCAX Sortino Ratio Rank: 53
OPCAX Omega Ratio Rank: 65
OPCAX Calmar Ratio Rank: 40
OPCAX Martin Ratio Rank: 35

MSIGX

MSIGX Risk / Return Rank: 41
MSIGX Sharpe Ratio Rank: 43
MSIGX Sortino Ratio Rank: 44
MSIGX Omega Ratio Rank: 42
MSIGX Calmar Ratio Rank: 32
MSIGX Martin Ratio Rank: 41

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.

OPCAX vs. MSIGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco California Municipal Fund (OPCAX) and Invesco Main Street Fund (MSIGX). 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.

	OPCAX	MSIGX	Difference
Sharpe ratio: Return per unit of total volatility	2.00	1.92	+0.08
Sortino ratio: Return per unit of downside risk	3.07	2.78	+0.29
Omega ratio: Gain probability vs. loss probability	1.45	1.35	+0.10
Calmar ratio: Return relative to maximum drawdown	2.41	2.13	+0.28
Martin ratio: Return relative to average drawdown	7.80	8.73	-0.92
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OPCAX vs. MSIGX - Sharpe Ratio Comparison

The current OPCAX Sharpe Ratio is 2.00, which is comparable to the MSIGX Sharpe Ratio of 1.92. The chart below compares the historical Sharpe Ratios of OPCAX and MSIGX, 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

	OPCAX	MSIGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.00	1.92	+0.08
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.08	0.65	-0.57
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.60	0.67	-0.07
Sharpe Ratio (All Time) Calculated using the full available price history	0.97	0.65	+0.32

Drawdowns

OPCAX vs. MSIGX - Drawdown Comparison

The maximum OPCAX drawdown since its inception was -47.36%, smaller than the maximum MSIGX drawdown of -57.22%. Use the drawdown chart below to compare losses from any high point for OPCAX and MSIGX.

Drawdown Indicators

	OPCAX	MSIGX	Difference
Max Drawdown Largest peak-to-trough decline	-47.36%	-57.22%	+9.86%
Max Drawdown (1Y) Largest decline over 1 year	-3.25%	-10.96%	+7.71%
Max Drawdown (3Y) Largest decline over 3 years	-8.46%	-19.91%	+11.45%
Max Drawdown (5Y) Largest decline over 5 years	-18.53%	-26.73%	+8.20%
Max Drawdown (10Y) Largest decline over 10 years	-18.53%	-35.41%	+16.88%
Current Drawdown Current decline from peak	0.00%	-0.39%	+0.39%
Average Drawdown Average peak-to-trough decline	-4.30%	-8.99%	+4.69%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.17%	2.56%	-1.39%

Volatility

OPCAX vs. MSIGX - Volatility Comparison

The current volatility for Invesco California Municipal Fund (OPCAX) is 1.51%, while Invesco Main Street Fund (MSIGX) has a volatility of 2.66%. This indicates that OPCAX experiences smaller price fluctuations and is considered to be less risky than MSIGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OPCAX	MSIGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.51%	2.66%	-1.15%
Volatility (6M) Calculated over the trailing 6-month period	2.73%	9.78%	-7.05%
Volatility (1Y) Calculated over the trailing 1-year period	3.96%	12.16%	-8.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.46%	16.90%	-11.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.12%	17.89%	-12.77%

OPCAX vs. MSIGX - Expense Ratio Comparison

OPCAX has a 0.75% expense ratio, which is lower than MSIGX's 0.82% expense ratio.

Dividends

OPCAX vs. MSIGX - Dividend Comparison

OPCAX's dividend yield for the trailing twelve months is around 2.76%, less than MSIGX's 7.07% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MSIGX Invesco Main Street Fund	7.07%	7.50%	6.06%	7.40%	4.68%	19.19%	3.17%	0.89%	19.62%	7.50%	2.96%	13.79%
OPCAX Invesco California Municipal Fund	2.76%	4.76%	4.19%	3.06%	2.86%	3.05%	3.15%	3.64%	3.71%	4.59%	4.92%	5.48%

Frequently Asked Questions

Can I hold both OPCAX and MSIGX in my portfolio?

OPCAX and MSIGX have a correlation of 0.20, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OPCAX or MSIGX?

MSIGX has higher volatility (2.66%) compared to OPCAX (1.51%). In terms of maximum drawdown, OPCAX dropped -47.36% vs MSIGX's -57.22%.

Which has better risk-adjusted returns?

OPCAX currently has the higher Sharpe Ratio (2.00 vs 1.92), 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.