STMGX vs. MMGPX
STMGX (American Beacon Stephens Mid-Cap Growth Fund) and MMGPX (Morgan Stanley Discovery Portfolio) are both Mid Cap Growth Equities funds. Over the past 5 years, STMGX returned 5.16%/yr vs -6.51%/yr for MMGPX. Their correlation of 0.81 means they have usually moved in the same direction. STMGX charges 1.14%/yr vs 0.04%/yr for MMGPX.
Performance
STMGX vs. MMGPX - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, STMGX achieves a 10.09% return, which is significantly higher than MMGPX's -2.74% return.
STMGX
- 1D
- 0.68%
- 1M
- -2.32%
- 6M
- 9.02%
- YTD
- 10.09%
- 1Y
- 13.30%
- 3Y*
- 14.17%
- 5Y*
- 5.16%
- 10Y*
- 13.33%
- ALL TIME*
- 9.79%
MMGPX
- 1D
- -1.80%
- 1M
- -5.59%
- 6M
- 3.05%
- YTD
- -2.74%
- 1Y
- -12.13%
- 3Y*
- 17.27%
- 5Y*
- -6.51%
- 10Y*
- —
- ALL TIME*
- 14.64%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
STMGX vs. MMGPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
STMGX American Beacon Stephens Mid-Cap Growth Fund | 10.09% | 12.98% | 13.16% | 25.22% | -28.31% | 12.29% | 39.82% | 31.31% | 1.71% | 21.94% |
MMGPX Morgan Stanley Discovery Portfolio | -2.74% | 12.58% | 41.83% | 44.34% | -63.37% | -11.55% | 152.67% | 40.20% | 10.89% | 28.18% |
Correlation
The correlation between STMGX and MMGPX is 0.76, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.76 |
Correlation (3Y) Balances recent behavior with more history. | 0.77 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.82 |
Correlation (All Time) Calculated using the full available price history since Feb 1, 2017 | 0.81 |
The correlation between STMGX and MMGPX has been stable across timeframes, ranging from 0.76 to 0.82 - a consistent structural relationship.
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
STMGX vs. MMGPX — Risk / Return Rank
STMGX
MMGPX
STMGX vs. MMGPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Beacon Stephens Mid-Cap Growth Fund (STMGX) and Morgan Stanley Discovery Portfolio (MMGPX). 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.
| STMGX | MMGPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +1.11 | ||
| Sortino ratioReturn per unit of downside risk | +1.50 | ||
| Omega ratioGain probability vs. loss probability | 1.12 | 0.95 | +0.17 |
| Calmar ratioReturn relative to maximum drawdown | 1.08 | -0.45 | +1.53 |
| Martin ratioReturn relative to average drawdown | 3.63 | -0.85 | +4.48 |
Loading charts...
Drawdowns
STMGX vs. MMGPX - Drawdown Comparison
The maximum STMGX drawdown since its inception was -57.58%, smaller than the maximum MMGPX drawdown of -75.38%. Use the drawdown chart below to compare losses from any high point for STMGX and MMGPX.
Loading charts...
Drawdown Indicators
| STMGX | MMGPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -57.58% | -75.38% | +17.80% |
Max Drawdown (1Y)Largest decline over 1 year | -10.84% | -27.79% | +16.95% |
Max Drawdown (3Y)Largest decline over 3 years | -22.50% | -29.27% | +6.77% |
Max Drawdown (5Y)Largest decline over 5 years | -36.59% | -72.70% | +36.11% |
Max Drawdown (10Y)Largest decline over 10 years | -36.59% | — | — |
Current DrawdownCurrent decline from peak | -3.20% | -41.88% | +38.68% |
Average DrawdownAverage peak-to-trough decline | -10.09% | -30.40% | +20.31% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.23% | 14.51% | -11.28% |
Volatility
STMGX vs. MMGPX - Volatility Comparison
The current volatility for American Beacon Stephens Mid-Cap Growth Fund (STMGX) is 3.84%, while Morgan Stanley Discovery Portfolio (MMGPX) has a volatility of 6.82%. This indicates that STMGX experiences smaller price fluctuations and is considered to be less risky than MMGPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| STMGX | MMGPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 3.84% | 6.82% | -2.98% |
Volatility (6M)Calculated over the trailing 6-month period | 13.50% | 21.95% | -8.45% |
Volatility (1Y)Calculated over the trailing 1-year period | 17.24% | 28.95% | -11.71% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 20.97% | 39.82% | -18.85% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 20.88% | 35.11% | -14.23% |
STMGX vs. MMGPX - Expense Ratio Comparison
STMGX has a 1.14% expense ratio, which is higher than MMGPX's 0.04% expense ratio.
Dividends
STMGX vs. MMGPX - Dividend Comparison
STMGX's dividend yield for the trailing twelve months is around 31.23%, while MMGPX has not paid dividends to shareholders.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MMGPX Morgan Stanley Discovery Portfolio | 0.00% | 0.43% | 0.00% | 0.00% | 125.40% | 64.53% | 7.93% | 15.63% | 28.02% | 0.00% | 0.00% | 0.00% |
STMGX American Beacon Stephens Mid-Cap Growth Fund | 31.23% | 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
STMGX and MMGPX have a correlation of 0.76, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MMGPX has higher volatility (6.82%) compared to STMGX (3.84%). In terms of maximum drawdown, STMGX dropped -57.58% vs MMGPX's -75.38%.
STMGX currently has the higher Sharpe Ratio (0.68 vs -0.43), 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.
Find the right allocation for STMGX and MMGPX
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer