MDYG vs. TMDIX

Last updated Jul 17, 2026

MDYG (SPDR S&P 400 Mid Cap Growth ETF) and TMDIX (AMG TimesSquare Mid Cap Growth Fund) are both Mid Cap Growth Equities funds. Over the past 10 years, MDYG returned 11.06%/yr vs 13.03%/yr for TMDIX. Their correlation of 0.89 suggests significant overlap in exposure. MDYG charges 0.15%/yr vs 0.98%/yr for TMDIX.

Performance

MDYG vs. TMDIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SPDR S&P 400 Mid Cap Growth ETF (MDYG) and AMG TimesSquare Mid Cap Growth Fund (TMDIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MDYG achieves a 17.08% return, which is significantly higher than TMDIX's 6.67% return. Over the past 10 years, MDYG has underperformed TMDIX with an annualized return of 11.06%, while TMDIX has yielded a comparatively higher 13.03% annualized return.

MDYG

• 1D: -0.40%
• 1M: -1.93%
• 6M: 9.40%
• YTD: 17.08%
• 1Y: 24.08%
• 3Y*: 14.59%
• 5Y*: 8.51%
• 10Y*: 11.06%

TMDIX

• 1D: -0.39%
• 1M: 1.65%
• 6M: 2.93%
• YTD: 6.67%
• 1Y: -2.93%
• 3Y*: 7.68%
• 5Y*: 4.01%
• 10Y*: 13.03%

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

MDYG vs. TMDIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MDYG SPDR S&P 400 Mid Cap Growth ETF	17.08%	7.22%	15.84%	17.30%	-18.92%	18.46%	22.57%	26.10%	-10.46%	19.61%
TMDIX AMG TimesSquare Mid Cap Growth Fund	6.67%	-1.76%	10.84%	25.07%	-22.26%	16.75%	33.42%	63.26%	-4.28%	22.66%

Correlation

The correlation between MDYG and TMDIX is 0.88, 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	0.88
Correlation (3Y) Calculated over the trailing 3-year period	0.88
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.90
Correlation (All Time) Calculated using the full available price history since Nov 15, 2005	0.89

The correlation between MDYG and TMDIX has been stable across timeframes, ranging from 0.88 to 0.91 - a consistent structural relationship.

Return for Risk

MDYG vs. TMDIX — Risk / Return Rank

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

MDYG

MDYG Risk / Return Rank: 54
MDYG Sharpe Ratio Rank: 48
MDYG Sortino Ratio Rank: 50
MDYG Omega Ratio Rank: 45
MDYG Calmar Ratio Rank: 61
MDYG Martin Ratio Rank: 66

TMDIX

TMDIX Risk / Return Rank: 2
TMDIX Sharpe Ratio Rank: 2
TMDIX Sortino Ratio Rank: 2
TMDIX Omega Ratio Rank: 3
TMDIX Calmar Ratio Rank: 2
TMDIX Martin Ratio Rank: 3

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.

MDYG vs. TMDIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SPDR S&P 400 Mid Cap Growth ETF (MDYG) and AMG TimesSquare Mid Cap Growth Fund (TMDIX). 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.

	MDYG	TMDIX	Difference
Sharpe ratio: Return per unit of total volatility	1.36	-0.12	+1.49
Sortino ratio: Return per unit of downside risk	2.01	-0.03	+2.04
Omega ratio: Gain probability vs. loss probability	1.24	1.00	+0.24
Calmar ratio: Return relative to maximum drawdown	2.44	-0.10	+2.54
Martin ratio: Return relative to average drawdown	9.41	-0.20	+9.61

MDYG vs. TMDIX - Sharpe Ratio Comparison

The current MDYG Sharpe Ratio is 1.36, which is higher than the TMDIX Sharpe Ratio of -0.12. The chart below compares the historical Sharpe Ratios of MDYG and TMDIX, 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

MDYG vs. TMDIX - Drawdown Comparison

The maximum MDYG drawdown since its inception was -58.44%, which is greater than TMDIX's maximum drawdown of -48.73%. Use the drawdown chart below to compare losses from any high point for MDYG and TMDIX.

Drawdown Indicators

	MDYG	TMDIX	Difference
Max Drawdown Largest peak-to-trough decline	-58.44%	-48.73%	-9.71%
Max Drawdown (1Y) Largest decline over 1 year	-9.91%	-25.45%	+15.54%
Max Drawdown (3Y) Largest decline over 3 years	-25.45%	-25.45%	0.00%
Max Drawdown (5Y) Largest decline over 5 years	-29.26%	-30.53%	+1.27%
Max Drawdown (10Y) Largest decline over 10 years	-39.27%	-35.44%	-3.83%
Current Drawdown Current decline from peak	-3.72%	-10.68%	+6.96%
Average Drawdown Average peak-to-trough decline	-7.99%	-7.18%	-0.81%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.56%	12.69%	-10.13%

Volatility

MDYG vs. TMDIX - Volatility Comparison

The current volatility for SPDR S&P 400 Mid Cap Growth ETF (MDYG) is 4.55%, while AMG TimesSquare Mid Cap Growth Fund (TMDIX) has a volatility of 5.05%. This indicates that MDYG experiences smaller price fluctuations and is considered to be less risky than TMDIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MDYG	TMDIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.55%	5.05%	-0.50%
Volatility (6M) Calculated over the trailing 6-month period	13.97%	13.80%	+0.17%
Volatility (1Y) Calculated over the trailing 1-year period	17.75%	20.41%	-2.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.73%	20.56%	+0.17%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.05%	21.09%	-0.04%

MDYG vs. TMDIX - Expense Ratio Comparison

MDYG has a 0.15% expense ratio, which is lower than TMDIX's 0.98% expense ratio.

Dividends

MDYG vs. TMDIX - Dividend Comparison

MDYG's dividend yield for the trailing twelve months is around 0.59%, while TMDIX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MDYG SPDR S&P 400 Mid Cap Growth ETF	0.59%	0.75%	0.87%	1.20%	1.16%	0.69%	0.71%	1.21%	1.36%	2.23%	1.25%	2.51%
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 MDYG and TMDIX in my portfolio?

MDYG and TMDIX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MDYG or TMDIX?

TMDIX has higher volatility (5.05%) compared to MDYG (4.55%). In terms of maximum drawdown, MDYG dropped -58.44% vs TMDIX's -48.73%.

Which has better risk-adjusted returns?

MDYG currently has the higher Sharpe Ratio (1.36 vs -0.12), 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.