MMGPX vs. TWHIX

Last updated Jul 17, 2026

MMGPX (Morgan Stanley Discovery Portfolio) and TWHIX (American Century Heritage Fund) are both Mid Cap Growth Equities funds. Over the past 5 years, MMGPX returned -5.11%/yr vs 4.93%/yr for TWHIX. Their correlation of 0.83 suggests significant overlap in exposure. MMGPX charges 0.04%/yr vs 1.00%/yr for TWHIX.

Performance

MMGPX vs. TWHIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Morgan Stanley Discovery Portfolio (MMGPX) and American Century Heritage Fund (TWHIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MMGPX achieves a 1.78% return, which is significantly lower than TWHIX's 6.21% return.

MMGPX

• 1D: -0.13%
• 1M: 2.77%
• 6M: -2.24%
• YTD: 1.78%
• 1Y: -7.36%
• 3Y*: 19.97%
• 5Y*: -5.11%
• 10Y*: —

TWHIX

• 1D: -0.99%
• 1M: 1.05%
• 6M: 2.13%
• YTD: 6.21%
• 1Y: 3.64%
• 3Y*: 13.22%
• 5Y*: 4.93%
• 10Y*: 11.69%

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

MMGPX vs. TWHIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MMGPX Morgan Stanley Discovery Portfolio	1.78%	12.58%	41.83%	44.34%	-63.37%	-11.55%	152.67%	40.20%	10.89%	28.18%
TWHIX American Century Heritage Fund	6.21%	6.53%	24.66%	20.64%	-28.13%	11.52%	42.61%	35.50%	-5.08%	17.97%

Correlation

The correlation between MMGPX and TWHIX is 0.80, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.80
Correlation (3Y) Calculated over the trailing 3-year period	0.82
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (All Time) Calculated using the full available price history since Feb 1, 2017	0.83

The correlation between MMGPX and TWHIX has been stable across timeframes, ranging from 0.80 to 0.85 - a consistent structural relationship.

Return for Risk

MMGPX vs. TWHIX — Risk / Return Rank

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

MMGPX

MMGPX Risk / Return Rank: 2
MMGPX Sharpe Ratio Rank: 2
MMGPX Sortino Ratio Rank: 2
MMGPX Omega Ratio Rank: 2
MMGPX Calmar Ratio Rank: 2
MMGPX Martin Ratio Rank: 2

TWHIX

TWHIX Risk / Return Rank: 5
TWHIX Sharpe Ratio Rank: 5
TWHIX Sortino Ratio Rank: 5
TWHIX Omega Ratio Rank: 5
TWHIX Calmar Ratio Rank: 5
TWHIX Martin Ratio Rank: 5

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.

MMGPX vs. TWHIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Morgan Stanley Discovery Portfolio (MMGPX) and American Century Heritage Fund (TWHIX). 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.

	MMGPX	TWHIX	Difference
Sharpe ratio: Return per unit of total volatility	-0.20	0.22	-0.43
Sortino ratio: Return per unit of downside risk	-0.09	0.45	-0.54
Omega ratio: Gain probability vs. loss probability	0.99	1.05	-0.06
Calmar ratio: Return relative to maximum drawdown	-0.21	0.26	-0.47
Martin ratio: Return relative to average drawdown	-0.41	0.75	-1.15

MMGPX vs. TWHIX - Sharpe Ratio Comparison

The current MMGPX Sharpe Ratio is -0.20, which is lower than the TWHIX Sharpe Ratio of 0.22. The chart below compares the historical Sharpe Ratios of MMGPX and TWHIX, 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

MMGPX vs. TWHIX - Drawdown Comparison

The maximum MMGPX drawdown since its inception was -75.38%, which is greater than TWHIX's maximum drawdown of -56.98%. Use the drawdown chart below to compare losses from any high point for MMGPX and TWHIX.

Drawdown Indicators

	MMGPX	TWHIX	Difference
Max Drawdown Largest peak-to-trough decline	-75.38%	-56.98%	-18.40%
Max Drawdown (1Y) Largest decline over 1 year	-27.79%	-15.82%	-11.97%
Max Drawdown (3Y) Largest decline over 3 years	-29.27%	-26.30%	-2.97%
Max Drawdown (5Y) Largest decline over 5 years	-72.70%	-40.34%	-32.36%
Max Drawdown (10Y) Largest decline over 10 years	—	-40.34%	—
Current Drawdown Current decline from peak	-39.18%	-2.35%	-36.83%
Average Drawdown Average peak-to-trough decline	-30.35%	-12.22%	-18.13%
Ulcer Index Depth and duration of drawdowns from previous peaks	14.07%	5.47%	+8.60%

Volatility

MMGPX vs. TWHIX - Volatility Comparison

Morgan Stanley Discovery Portfolio (MMGPX) has a higher volatility of 6.57% compared to American Century Heritage Fund (TWHIX) at 4.97%. This indicates that MMGPX's price experiences larger fluctuations and is considered to be riskier than TWHIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MMGPX	TWHIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.57%	4.97%	+1.60%
Volatility (6M) Calculated over the trailing 6-month period	21.82%	14.62%	+7.20%
Volatility (1Y) Calculated over the trailing 1-year period	28.50%	18.25%	+10.25%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	39.82%	23.39%	+16.43%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	35.15%	22.83%	+12.32%

MMGPX vs. TWHIX - Expense Ratio Comparison

MMGPX has a 0.04% expense ratio, which is lower than TWHIX's 1.00% expense ratio.

Dividends

MMGPX vs. TWHIX - Dividend Comparison

MMGPX has not paid dividends to shareholders, while TWHIX's dividend yield for the trailing twelve months is around 20.84%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
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%
TWHIX American Century Heritage Fund	20.84%	22.14%	15.58%	0.78%	0.98%	12.00%	13.72%	11.32%	25.33%	9.38%	8.71%

Frequently Asked Questions

Can I hold both MMGPX and TWHIX in my portfolio?

MMGPX and TWHIX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MMGPX or TWHIX?

MMGPX has higher volatility (6.57%) compared to TWHIX (4.97%). In terms of maximum drawdown, MMGPX dropped -75.38% vs TWHIX's -56.98%.

Which has better risk-adjusted returns?

TWHIX currently has the higher Sharpe Ratio (0.22 vs -0.20), 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.