TMDIX vs. MMGPX

Last updated Aug 1, 2026

TMDIX (AMG TimesSquare Mid Cap Growth Fund) and MMGPX (Morgan Stanley Discovery Portfolio) are both Mid Cap Growth Equities funds. Over the past 5 years, TMDIX returned 2.93%/yr vs -6.17%/yr for MMGPX. Their 0.79 correlation means they have sometimes moved together and sometimes differently. TMDIX charges 0.98%/yr vs 0.04%/yr for MMGPX.

Performance

TMDIX vs. MMGPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG TimesSquare Mid Cap Growth Fund (TMDIX) and Morgan Stanley Discovery Portfolio (MMGPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TMDIX achieves a 4.53% return, which is significantly higher than MMGPX's -0.96% return.

TMDIX

• 1D: 2.45%
• 1M: -3.41%
• 6M: 5.22%
• YTD: 4.53%
• 1Y: -6.10%
• 3Y*: 6.58%
• 5Y*: 2.93%
• 10Y*: 12.70%
• ALL TIME*: 10.91%

MMGPX

• 1D: 2.26%
• 1M: -3.86%
• 6M: 4.78%
• YTD: -0.96%
• 1Y: -10.52%
• 3Y*: 17.63%
• 5Y*: -6.17%
• 10Y*: —
• ALL TIME*: 14.86%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
MMGPX Morgan Stanley Discovery Portfolio	$0.00	$0.00	$0.00
TMDIX AMG TimesSquare Mid Cap Growth Fund	$0.00	$0.00	$0.00

TMDIX vs. MMGPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TMDIX AMG TimesSquare Mid Cap Growth Fund	4.53%	-1.76%	10.84%	25.07%	-22.26%	16.75%	33.42%	63.26%	-4.28%	20.20%
MMGPX Morgan Stanley Discovery Portfolio	-0.96%	12.58%	41.83%	44.34%	-63.37%	-11.55%	152.67%	40.20%	10.89%	28.18%

Correlation

The correlation between TMDIX 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.	0.78
Correlation (5Y) Shows whether the relationship held over a longer period.	0.81
Correlation (All Time) Calculated using the full available price history since Feb 1, 2017	0.79

The correlation between TMDIX and MMGPX has been stable across timeframes, ranging from 0.76 to 0.81 - a consistent structural relationship.

Return for Risk

TMDIX vs. MMGPX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

TMDIX

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

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

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

TMDIX vs. MMGPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG TimesSquare Mid Cap Growth Fund (TMDIX) 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.

	TMDIX	MMGPX	Difference
Sharpe ratio: Return per unit of total volatility	-0.39	-0.33	-0.06
Sortino ratio: Return per unit of downside risk	-0.38	-0.28	-0.10
Omega ratio: Gain probability vs. loss probability	0.95	0.97	-0.02
Calmar ratio: Return relative to maximum drawdown	-0.31	-0.34	+0.03
Martin ratio: Return relative to average drawdown	-0.61	-0.66	+0.05

TMDIX vs. MMGPX - Sharpe Ratio Comparison

The current TMDIX Sharpe Ratio is -0.39, which is comparable to the MMGPX Sharpe Ratio of -0.33. The chart below compares the historical Sharpe Ratios of TMDIX and MMGPX, 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

TMDIX vs. MMGPX - Drawdown Comparison

The maximum TMDIX drawdown since its inception was -48.73%, smaller than the maximum MMGPX drawdown of -75.38%. Use the drawdown chart below to compare losses from any high point for TMDIX and MMGPX.

Drawdown Indicators

	TMDIX	MMGPX	Difference
Max Drawdown Largest peak-to-trough decline	-48.73%	-75.38%	+26.65%
Max Drawdown (1Y) Largest decline over 1 year	-25.45%	-27.79%	+2.34%
Max Drawdown (3Y) Largest decline over 3 years	-25.45%	-29.27%	+3.82%
Max Drawdown (5Y) Largest decline over 5 years	-30.53%	-72.70%	+42.17%
Max Drawdown (10Y) Largest decline over 10 years	-35.44%	—	—
Current Drawdown Current decline from peak	-12.48%	-40.82%	+28.34%
Average Drawdown Average peak-to-trough decline	-7.19%	-30.40%	+23.21%
Ulcer Index Depth and duration of drawdowns from previous peaks	12.95%	14.47%	-1.52%

Volatility

TMDIX vs. MMGPX - Volatility Comparison

The current volatility for AMG TimesSquare Mid Cap Growth Fund (TMDIX) is 4.81%, while Morgan Stanley Discovery Portfolio (MMGPX) has a volatility of 6.84%. This indicates that TMDIX 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.

Volatility by Period

	TMDIX	MMGPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.81%	6.84%	-2.03%
Volatility (6M) Calculated over the trailing 6-month period	14.06%	21.99%	-7.93%
Volatility (1Y) Calculated over the trailing 1-year period	20.64%	28.90%	-8.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.59%	39.83%	-19.24%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.11%	35.11%	-14.00%

TMDIX vs. MMGPX - Expense Ratio Comparison

TMDIX has a 0.98% expense ratio, which is higher than MMGPX's 0.04% expense ratio.

Dividends

TMDIX vs. MMGPX - Dividend Comparison

Neither TMDIX nor MMGPX has 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%
TMDIX AMG TimesSquare Mid Cap Growth Fund	0.00%	0.00%	8.08%	3.98%	3.69%	29.72%	18.28%	31.06%	16.38%	14.44%	5.90%	7.73%

Frequently Asked Questions

Can I hold both TMDIX and MMGPX in my portfolio?

TMDIX 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.

Which is riskier, TMDIX or MMGPX?

MMGPX has higher volatility (6.84%) compared to TMDIX (4.81%). In terms of maximum drawdown, TMDIX dropped -48.73% vs MMGPX's -75.38%.

Which has better risk-adjusted returns?

MMGPX currently has the higher Sharpe Ratio (-0.33 vs -0.39), 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.