MAMEX vs. FTSIX

Last updated Jun 4, 2026

MAMEX (Mutual of America Mid-Cap Equity Index Fund) and FTSIX (Fuller & Thaler Behavioral Small-Mid Core Equity Fund) are both Mid Cap Blend Equities funds. Over the past 5 years, MAMEX returned 7.22%/yr vs 6.57%/yr for FTSIX. Their correlation of 0.83 suggests significant overlap in exposure. MAMEX charges 0.16%/yr vs 2.69%/yr for FTSIX.

Performance

MAMEX vs. FTSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Mutual of America Mid-Cap Equity Index Fund (MAMEX) and Fuller & Thaler Behavioral Small-Mid Core Equity Fund (FTSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with MAMEX having a 14.08% return and FTSIX slightly higher at 14.68%.

MAMEX

• 1D: 0.88%
• 1M: 3.94%
• YTD: 14.08%
• 6M: 14.46%
• 1Y: 25.52%
• 3Y*: 15.21%
• 5Y*: 7.22%
• 10Y*: —

FTSIX

• 1D: 0.81%
• 1M: 2.54%
• YTD: 14.68%
• 6M: 14.78%
• 1Y: 27.56%
• 3Y*: 15.31%
• 5Y*: 6.57%
• 10Y*: —

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

MAMEX vs. FTSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
MAMEX Mutual of America Mid-Cap Equity Index Fund	14.08%	7.40%	13.08%	13.99%	-13.59%	23.35%	925.33%
FTSIX Fuller & Thaler Behavioral Small-Mid Core Equity Fund	14.68%	6.04%	11.86%	18.52%	-17.63%	25.29%	18.91%

Correlation

The correlation between MAMEX and FTSIX is 0.80, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.80
Correlation (3Y) Calculated over the trailing 3-year period	0.86
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (All Time) Calculated using the full available price history since Jan 3, 2020	0.83

The correlation between MAMEX and FTSIX has been stable across timeframes, ranging from 0.80 to 0.86 - a consistent structural relationship.

Return for Risk

MAMEX vs. FTSIX — Risk / Return Rank

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

MAMEX

MAMEX Risk / Return Rank: 54
MAMEX Sharpe Ratio Rank: 42
MAMEX Sortino Ratio Rank: 45
MAMEX Omega Ratio Rank: 40
MAMEX Calmar Ratio Rank: 76
MAMEX Martin Ratio Rank: 68

FTSIX

FTSIX Risk / Return Rank: 55
FTSIX Sharpe Ratio Rank: 41
FTSIX Sortino Ratio Rank: 43
FTSIX Omega Ratio Rank: 38
FTSIX Calmar Ratio Rank: 88
FTSIX Martin Ratio Rank: 64

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.

MAMEX vs. FTSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Mutual of America Mid-Cap Equity Index Fund (MAMEX) and Fuller & Thaler Behavioral Small-Mid Core Equity Fund (FTSIX). 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.

	MAMEX	FTSIX	Difference
Sharpe ratio: Return per unit of total volatility	1.90	1.88	+0.02
Sortino ratio: Return per unit of downside risk	2.82	2.75	+0.08
Omega ratio: Gain probability vs. loss probability	1.34	1.33	+0.01
Calmar ratio: Return relative to maximum drawdown	3.45	4.34	-0.89
Martin ratio: Return relative to average drawdown	13.17	12.51	+0.66
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MAMEX vs. FTSIX - Sharpe Ratio Comparison

The current MAMEX Sharpe Ratio is 1.90, which is comparable to the FTSIX Sharpe Ratio of 1.88. The chart below compares the historical Sharpe Ratios of MAMEX and FTSIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	MAMEX	FTSIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.90	1.88	+0.02
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.37	0.35	+0.02
Sharpe Ratio (All Time) Calculated using the full available price history	0.17	0.57	-0.40

Drawdowns

MAMEX vs. FTSIX - Drawdown Comparison

The maximum MAMEX drawdown since its inception was -42.17%, roughly equal to the maximum FTSIX drawdown of -42.12%. Use the drawdown chart below to compare losses from any high point for MAMEX and FTSIX.

Drawdown Indicators

	MAMEX	FTSIX	Difference
Max Drawdown Largest peak-to-trough decline	-42.17%	-42.12%	-0.05%
Max Drawdown (1Y) Largest decline over 1 year	-8.84%	-6.80%	-2.04%
Max Drawdown (3Y) Largest decline over 3 years	-24.11%	-23.30%	-0.81%
Max Drawdown (5Y) Largest decline over 5 years	-24.39%	-27.57%	+3.18%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-7.50%	-7.65%	+0.15%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.28%	2.35%	-0.07%

Volatility

MAMEX vs. FTSIX - Volatility Comparison

Mutual of America Mid-Cap Equity Index Fund (MAMEX) and Fuller & Thaler Behavioral Small-Mid Core Equity Fund (FTSIX) have volatilities of 4.43% and 4.28%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MAMEX	FTSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.43%	4.28%	+0.15%
Volatility (6M) Calculated over the trailing 6-month period	12.23%	11.11%	+1.12%
Volatility (1Y) Calculated over the trailing 1-year period	16.08%	15.75%	+0.33%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.01%	19.09%	+2.92%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	383.36%	23.34%	+360.02%

MAMEX vs. FTSIX - Expense Ratio Comparison

MAMEX has a 0.16% expense ratio, which is lower than FTSIX's 2.69% expense ratio.

Dividends

MAMEX vs. FTSIX - Dividend Comparison

MAMEX's dividend yield for the trailing twelve months is around 10.39%, more than FTSIX's 0.56% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
FTSIX Fuller & Thaler Behavioral Small-Mid Core Equity Fund	0.56%	0.64%	0.84%	0.85%	0.95%	5.50%	0.35%	2.16%
MAMEX Mutual of America Mid-Cap Equity Index Fund	10.39%	11.85%	9.07%	7.67%	14.01%	12.96%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MAMEX and FTSIX in my portfolio?

MAMEX and FTSIX 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, MAMEX or FTSIX?

MAMEX has higher volatility (4.43%) compared to FTSIX (4.28%). In terms of maximum drawdown, MAMEX dropped -42.17% vs FTSIX's -42.12%.

Which has better risk-adjusted returns?

MAMEX currently has the higher Sharpe Ratio (1.90 vs 1.88), 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.