PDRDX vs. STMGX

Last updated Jun 13, 2026

PDRDX (Principal Diversified Real Asset Fund) and STMGX (American Beacon Stephens Mid-Cap Growth Fund) are both mutual funds - PDRDX is a Global Allocation fund managed by Principal, while STMGX is a Mid Cap Growth Equities fund managed by American Beacon. Over the past 10 years, PDRDX returned 6.35%/yr vs 13.82%/yr for STMGX. A 0.64 correlation means they provide meaningful diversification when combined. PDRDX charges 0.83%/yr vs 1.14%/yr for STMGX.

Performance

PDRDX vs. STMGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Principal Diversified Real Asset Fund (PDRDX) and American Beacon Stephens Mid-Cap Growth Fund (STMGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PDRDX achieves a 11.44% return, which is significantly higher than STMGX's 9.81% return. Over the past 10 years, PDRDX has underperformed STMGX with an annualized return of 6.35%, while STMGX has yielded a comparatively higher 13.82% annualized return.

PDRDX

• 1D: 0.74%
• 1M: -2.51%
• YTD: 11.44%
• 6M: 12.28%
• 1Y: 19.27%
• 3Y*: 10.82%
• 5Y*: 5.81%
• 10Y*: 6.35%

STMGX

• 1D: 2.97%
• 1M: 5.64%
• YTD: 9.81%
• 6M: 9.13%
• 1Y: 18.86%
• 3Y*: 16.21%
• 5Y*: 6.27%
• 10Y*: 13.82%

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

PDRDX vs. STMGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PDRDX Principal Diversified Real Asset Fund	11.44%	14.63%	3.09%	3.22%	-6.19%	17.30%	3.97%	15.02%	-7.90%	10.18%
STMGX American Beacon Stephens Mid-Cap Growth Fund	9.81%	12.98%	13.16%	25.22%	-28.31%	12.29%	39.82%	31.31%	1.71%	27.97%

Correlation

The correlation between PDRDX and STMGX is 0.43, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.43
Correlation (3Y) Calculated over the trailing 3-year period	0.54
Correlation (5Y) Calculated over the trailing 5-year period	0.59
Correlation (10Y) Calculated over the trailing 10-year period	0.60
Correlation (All Time) Calculated using the full available price history since Mar 17, 2010	0.64

Over the past year, the correlation between PDRDX and STMGX has dropped to 0.43 - well below their long-term average of 0.64, suggesting their price drivers have been diverging.

Return for Risk

PDRDX vs. STMGX — Risk / Return Rank

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

PDRDX

PDRDX Risk / Return Rank: 79
PDRDX Sharpe Ratio Rank: 76
PDRDX Sortino Ratio Rank: 73
PDRDX Omega Ratio Rank: 74
PDRDX Calmar Ratio Rank: 84
PDRDX Martin Ratio Rank: 87

STMGX

STMGX Risk / Return Rank: 22
STMGX Sharpe Ratio Rank: 19
STMGX Sortino Ratio Rank: 19
STMGX Omega Ratio Rank: 17
STMGX Calmar Ratio Rank: 26
STMGX Martin Ratio Rank: 29

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.

PDRDX vs. STMGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Principal Diversified Real Asset Fund (PDRDX) and American Beacon Stephens Mid-Cap Growth Fund (STMGX). 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.

	PDRDX	STMGX	Difference
Sharpe ratio: Return per unit of total volatility	2.13	1.05	+1.08
Sortino ratio: Return per unit of downside risk	2.92	1.55	+1.37
Omega ratio: Gain probability vs. loss probability	1.39	1.18	+0.21
Calmar ratio: Return relative to maximum drawdown	3.38	1.64	+1.74
Martin ratio: Return relative to average drawdown	13.83	5.72	+8.11

PDRDX vs. STMGX - Sharpe Ratio Comparison

The current PDRDX Sharpe Ratio is 2.13, which is higher than the STMGX Sharpe Ratio of 1.05. The chart below compares the historical Sharpe Ratios of PDRDX and STMGX, 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

PDRDX vs. STMGX - Drawdown Comparison

The maximum PDRDX drawdown since its inception was -28.55%, smaller than the maximum STMGX drawdown of -57.58%. Use the drawdown chart below to compare losses from any high point for PDRDX and STMGX.

Drawdown Indicators

	PDRDX	STMGX	Difference
Max Drawdown Largest peak-to-trough decline	-28.55%	-57.58%	+29.03%
Max Drawdown (1Y) Largest decline over 1 year	-5.88%	-10.84%	+4.96%
Max Drawdown (3Y) Largest decline over 3 years	-10.94%	-22.50%	+11.56%
Max Drawdown (5Y) Largest decline over 5 years	-19.35%	-36.59%	+17.24%
Max Drawdown (10Y) Largest decline over 10 years	-28.55%	-36.59%	+8.04%
Current Drawdown Current decline from peak	-2.93%	-1.65%	-1.28%
Average Drawdown Average peak-to-trough decline	-5.97%	-10.14%	+4.17%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.43%	3.10%	-1.67%

Volatility

PDRDX vs. STMGX - Volatility Comparison

The current volatility for Principal Diversified Real Asset Fund (PDRDX) is 2.94%, while American Beacon Stephens Mid-Cap Growth Fund (STMGX) has a volatility of 6.41%. This indicates that PDRDX experiences smaller price fluctuations and is considered to be less risky than STMGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PDRDX	STMGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.94%	6.41%	-3.47%
Volatility (6M) Calculated over the trailing 6-month period	7.83%	13.49%	-5.66%
Volatility (1Y) Calculated over the trailing 1-year period	9.31%	16.90%	-7.59%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	11.02%	20.92%	-9.90%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	10.81%	20.92%	-10.11%

PDRDX vs. STMGX - Expense Ratio Comparison

PDRDX has a 0.83% expense ratio, which is lower than STMGX's 1.14% expense ratio.

Dividends

PDRDX vs. STMGX - Dividend Comparison

PDRDX's dividend yield for the trailing twelve months is around 3.85%, less than STMGX's 31.31% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PDRDX Principal Diversified Real Asset Fund	3.85%	4.19%	2.43%	2.52%	12.88%	6.56%	0.52%	2.36%	3.47%	2.21%	2.61%	0.99%
STMGX American Beacon Stephens Mid-Cap Growth Fund	31.31%	34.38%	4.86%	0.00%	3.42%	7.49%	1.45%	3.60%	9.39%	5.40%	6.65%	5.62%

Frequently Asked Questions

Can I hold both PDRDX and STMGX in my portfolio?

PDRDX and STMGX have a correlation of 0.43, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, PDRDX or STMGX?

STMGX has higher volatility (6.41%) compared to PDRDX (2.94%). In terms of maximum drawdown, PDRDX dropped -28.55% vs STMGX's -57.58%.

Which has better risk-adjusted returns?

PDRDX currently has the higher Sharpe Ratio (2.13 vs 1.05), 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.