PMOAX vs. PSSMX

Last updated Jun 4, 2026

PMOAX (Principal Opportunistic Municipal Fund) and PSSMX (Principal SmallCap S&P 600 Index Fund) are both mutual funds - PMOAX is a High Yield Muni fund managed by Principal, while PSSMX is a Small Cap Blend Equities fund managed by Principal. Over the past 10 years, PMOAX returned 2.49%/yr vs 10.83%/yr for PSSMX. At a correlation of -0.07, they often move in opposite directions. PMOAX charges 0.84%/yr vs 0.73%/yr for PSSMX.

Performance

PMOAX vs. PSSMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Principal Opportunistic Municipal Fund (PMOAX) and Principal SmallCap S&P 600 Index Fund (PSSMX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PMOAX achieves a 2.30% return, which is significantly lower than PSSMX's 15.97% return. Over the past 10 years, PMOAX has underperformed PSSMX with an annualized return of 2.49%, while PSSMX has yielded a comparatively higher 10.83% annualized return.

PMOAX

• 1D: 0.21%
• 1M: 1.23%
• YTD: 2.30%
• 6M: 2.60%
• 1Y: 7.73%
• 3Y*: 4.62%
• 5Y*: -0.04%
• 10Y*: 2.49%

PSSMX

• 1D: 0.85%
• 1M: 2.53%
• YTD: 15.97%
• 6M: 14.78%
• 1Y: 31.83%
• 3Y*: 16.96%
• 5Y*: 6.80%
• 10Y*: 10.83%

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

PMOAX vs. PSSMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PMOAX Principal Opportunistic Municipal Fund	2.30%	2.91%	4.40%	6.76%	-16.56%	6.38%	4.40%	10.55%	1.34%	10.14%
PSSMX Principal SmallCap S&P 600 Index Fund	15.97%	5.34%	16.60%	15.18%	-16.69%	25.39%	10.65%	21.99%	-9.42%	12.46%

Correlation

The correlation between PMOAX and PSSMX is 0.10, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.10
Correlation (3Y) Calculated over the trailing 3-year period	0.12
Correlation (5Y) Calculated over the trailing 5-year period	0.08
Correlation (10Y) Calculated over the trailing 10-year period	-0.01
Correlation (All Time) Calculated using the full available price history since Jun 18, 2012	-0.07

The correlation between PMOAX and PSSMX shifts across timeframes, from -0.07 (all time) to 0.12 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

PMOAX vs. PSSMX — Risk / Return Rank

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

PMOAX

PMOAX Risk / Return Rank: 62
PMOAX Sharpe Ratio Rank: 61
PMOAX Sortino Ratio Rank: 79
PMOAX Omega Ratio Rank: 83
PMOAX Calmar Ratio Rank: 49
PMOAX Martin Ratio Rank: 39

PSSMX

PSSMX Risk / Return Rank: 56
PSSMX Sharpe Ratio Rank: 45
PSSMX Sortino Ratio Rank: 45
PSSMX Omega Ratio Rank: 40
PSSMX Calmar Ratio Rank: 83
PSSMX Martin Ratio Rank: 67

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.

PMOAX vs. PSSMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Principal Opportunistic Municipal Fund (PMOAX) and Principal SmallCap S&P 600 Index Fund (PSSMX). 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.

	PMOAX	PSSMX	Difference
Sharpe ratio: Return per unit of total volatility	2.31	1.95	+0.36
Sortino ratio: Return per unit of downside risk	3.81	2.84	+0.97
Omega ratio: Gain probability vs. loss probability	1.56	1.34	+0.22
Calmar ratio: Return relative to maximum drawdown	2.67	3.89	-1.23
Martin ratio: Return relative to average drawdown	8.41	13.00	-4.59
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PMOAX vs. PSSMX - Sharpe Ratio Comparison

The current PMOAX Sharpe Ratio is 2.31, which is comparable to the PSSMX Sharpe Ratio of 1.95. The chart below compares the historical Sharpe Ratios of PMOAX and PSSMX, 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

	PMOAX	PSSMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.31	1.95	+0.36
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.01	0.31	-0.32
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.49	0.47	+0.02
Sharpe Ratio (All Time) Calculated using the full available price history	0.75	0.41	+0.34

Drawdowns

PMOAX vs. PSSMX - Drawdown Comparison

The maximum PMOAX drawdown since its inception was -21.33%, smaller than the maximum PSSMX drawdown of -58.43%. Use the drawdown chart below to compare losses from any high point for PMOAX and PSSMX.

Drawdown Indicators

	PMOAX	PSSMX	Difference
Max Drawdown Largest peak-to-trough decline	-21.33%	-58.43%	+37.10%
Max Drawdown (1Y) Largest decline over 1 year	-2.91%	-8.76%	+5.85%
Max Drawdown (3Y) Largest decline over 3 years	-6.41%	-24.30%	+17.89%
Max Drawdown (5Y) Largest decline over 5 years	-21.33%	-27.01%	+5.68%
Max Drawdown (10Y) Largest decline over 10 years	-21.33%	-44.85%	+23.52%
Current Drawdown Current decline from peak	-2.31%	-0.07%	-2.24%
Average Drawdown Average peak-to-trough decline	-4.79%	-9.52%	+4.73%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.92%	2.62%	-1.70%

Volatility

PMOAX vs. PSSMX - Volatility Comparison

The current volatility for Principal Opportunistic Municipal Fund (PMOAX) is 1.16%, while Principal SmallCap S&P 600 Index Fund (PSSMX) has a volatility of 4.47%. This indicates that PMOAX experiences smaller price fluctuations and is considered to be less risky than PSSMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PMOAX	PSSMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.16%	4.47%	-3.31%
Volatility (6M) Calculated over the trailing 6-month period	2.29%	11.69%	-9.40%
Volatility (1Y) Calculated over the trailing 1-year period	3.38%	17.46%	-14.08%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.76%	21.76%	-17.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.06%	22.92%	-17.86%

PMOAX vs. PSSMX - Expense Ratio Comparison

PMOAX has a 0.84% expense ratio, which is higher than PSSMX's 0.73% expense ratio.

Dividends

PMOAX vs. PSSMX - Dividend Comparison

PMOAX's dividend yield for the trailing twelve months is around 4.51%, less than PSSMX's 8.61% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PMOAX Principal Opportunistic Municipal Fund	4.51%	4.59%	4.32%	3.42%	3.36%	3.09%	3.28%	3.48%	3.89%	3.62%	3.57%	3.73%
PSSMX Principal SmallCap S&P 600 Index Fund	8.61%	9.98%	15.91%	3.75%	10.45%	8.23%	1.67%	6.56%	13.08%	6.03%	6.15%	8.07%

Frequently Asked Questions

Can I hold both PMOAX and PSSMX in my portfolio?

PMOAX and PSSMX have a correlation of 0.10, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, PMOAX or PSSMX?

PSSMX has higher volatility (4.47%) compared to PMOAX (1.16%). In terms of maximum drawdown, PMOAX dropped -21.33% vs PSSMX's -58.43%.

Which has better risk-adjusted returns?

PMOAX currently has the higher Sharpe Ratio (2.31 vs 1.95), 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.