PSPFX vs. MLPZX

Last updated Jul 14, 2026

PSPFX (U.S. Global Investors Global Resources Fund) and MLPZX (Invesco SteelPath MLP Income Fund) are both Energy Equities funds. Over the past 10 years, PSPFX returned 7.23%/yr vs 9.65%/yr for MLPZX. A 0.53 correlation means they provide meaningful diversification when combined. PSPFX charges 1.54%/yr vs 1.10%/yr for MLPZX.

Performance

PSPFX vs. MLPZX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in U.S. Global Investors Global Resources Fund (PSPFX) and Invesco SteelPath MLP Income Fund (MLPZX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PSPFX achieves a -4.83% return, which is significantly lower than MLPZX's 19.85% return. Over the past 10 years, PSPFX has underperformed MLPZX with an annualized return of 7.23%, while MLPZX has yielded a comparatively higher 9.65% annualized return.

PSPFX

• 1D: 0.00%
• 1M: -10.79%
• 6M: -7.66%
• YTD: -4.83%
• 1Y: 41.41%
• 3Y*: 15.54%
• 5Y*: 6.83%
• 10Y*: 7.23%

MLPZX

• 1D: -0.66%
• 1M: 0.27%
• 6M: 16.81%
• YTD: 19.85%
• 1Y: 23.42%
• 3Y*: 21.37%
• 5Y*: 18.92%
• 10Y*: 9.65%

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

PSPFX vs. MLPZX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PSPFX U.S. Global Investors Global Resources Fund	-4.83%	80.27%	-3.74%	-7.67%	-12.39%	13.97%	37.05%	7.80%	-24.97%	19.62%
MLPZX Invesco SteelPath MLP Income Fund	19.85%	7.88%	24.54%	20.71%	25.10%	44.98%	-25.49%	14.50%	-12.92%	-8.42%

Correlation

The correlation between PSPFX and MLPZX is 0.10, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.10
Correlation (3Y) Calculated over the trailing 3-year period	0.35
Correlation (5Y) Calculated over the trailing 5-year period	0.54
Correlation (10Y) Calculated over the trailing 10-year period	0.51
Correlation (All Time) Calculated using the full available price history since Mar 31, 2010	0.53

Over the past year, the correlation between PSPFX and MLPZX has dropped to 0.10 - well below their long-term average of 0.53, suggesting their price drivers have been diverging.

Return for Risk

PSPFX vs. MLPZX — Risk / Return Rank

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

PSPFX

PSPFX Risk / Return Rank: 40
PSPFX Sharpe Ratio Rank: 46
PSPFX Sortino Ratio Rank: 37
PSPFX Omega Ratio Rank: 44
PSPFX Calmar Ratio Rank: 40
PSPFX Martin Ratio Rank: 33

MLPZX

MLPZX Risk / Return Rank: 72
MLPZX Sharpe Ratio Rank: 75
MLPZX Sortino Ratio Rank: 73
MLPZX Omega Ratio Rank: 66
MLPZX Calmar Ratio Rank: 84
MLPZX Martin Ratio Rank: 61

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.

PSPFX vs. MLPZX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for U.S. Global Investors Global Resources Fund (PSPFX) and Invesco SteelPath MLP Income Fund (MLPZX). 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.

	PSPFX	MLPZX	Difference
Sharpe ratio: Return per unit of total volatility	1.51	1.95	-0.44
Sortino ratio: Return per unit of downside risk	1.95	2.73	-0.78
Omega ratio: Gain probability vs. loss probability	1.27	1.33	-0.06
Calmar ratio: Return relative to maximum drawdown	1.92	3.18	-1.27
Martin ratio: Return relative to average drawdown	5.77	9.35	-3.58

PSPFX vs. MLPZX - Sharpe Ratio Comparison

The current PSPFX Sharpe Ratio is 1.51, which is comparable to the MLPZX Sharpe Ratio of 1.95. The chart below compares the historical Sharpe Ratios of PSPFX and MLPZX, 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

PSPFX vs. MLPZX - Drawdown Comparison

The maximum PSPFX drawdown since its inception was -79.09%, roughly equal to the maximum MLPZX drawdown of -77.56%. Use the drawdown chart below to compare losses from any high point for PSPFX and MLPZX.

Drawdown Indicators

	PSPFX	MLPZX	Difference
Max Drawdown Largest peak-to-trough decline	-79.09%	-77.56%	-1.53%
Max Drawdown (1Y) Largest decline over 1 year	-22.70%	-7.48%	-15.22%
Max Drawdown (3Y) Largest decline over 3 years	-22.70%	-14.46%	-8.24%
Max Drawdown (5Y) Largest decline over 5 years	-39.15%	-17.90%	-21.25%
Max Drawdown (10Y) Largest decline over 10 years	-56.80%	-73.62%	+16.82%
Current Drawdown Current decline from peak	-23.82%	-4.43%	-19.39%
Average Drawdown Average peak-to-trough decline	-42.44%	-13.47%	-28.97%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.53%	2.54%	+4.99%

Volatility

PSPFX vs. MLPZX - Volatility Comparison

U.S. Global Investors Global Resources Fund (PSPFX) has a higher volatility of 7.39% compared to Invesco SteelPath MLP Income Fund (MLPZX) at 4.94%. This indicates that PSPFX's price experiences larger fluctuations and is considered to be riskier than MLPZX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PSPFX	MLPZX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.39%	4.94%	+2.45%
Volatility (6M) Calculated over the trailing 6-month period	24.02%	9.58%	+14.44%
Volatility (1Y) Calculated over the trailing 1-year period	28.79%	12.19%	+16.60%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.43%	17.20%	+6.23%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.00%	25.81%	-3.81%

PSPFX vs. MLPZX - Expense Ratio Comparison

PSPFX has a 1.54% expense ratio, which is higher than MLPZX's 1.10% expense ratio.

Dividends

PSPFX vs. MLPZX - Dividend Comparison

PSPFX's dividend yield for the trailing twelve months is around 47.70%, more than MLPZX's 6.15% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MLPZX Invesco SteelPath MLP Income Fund	6.15%	6.87%	5.92%	7.19%	7.98%	9.19%	16.57%	13.12%	13.27%	10.70%	9.79%	10.93%
PSPFX U.S. Global Investors Global Resources Fund	47.70%	0.83%	4.34%	0.00%	15.68%	18.92%	5.49%	1.90%	4.70%	3.01%	3.33%	1.12%

Frequently Asked Questions

Can I hold both PSPFX and MLPZX in my portfolio?

PSPFX and MLPZX 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, PSPFX or MLPZX?

PSPFX has higher volatility (7.39%) compared to MLPZX (4.94%). In terms of maximum drawdown, PSPFX dropped -79.09% vs MLPZX's -77.56%.

Which has better risk-adjusted returns?

MLPZX currently has the higher Sharpe Ratio (1.95 vs 1.51), 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.