MAIFX vs. VOO

Last updated Jun 23, 2026

MAIFX (Mutual of America International Fund) and VOO (Vanguard S&P 500 ETF) are both funds - MAIFX is a Foreign Large Cap Equities fund managed by Mutual of America, while VOO is a S&P 500 fund tracking the S&P 500 Index. Over the past 5 years, MAIFX returned 9.53%/yr vs 13.58%/yr for VOO. A 0.66 correlation means they provide meaningful diversification when combined. MAIFX charges 0.13%/yr vs 0.03%/yr for VOO.

Performance

MAIFX vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Mutual of America International Fund (MAIFX) and Vanguard S&P 500 ETF (VOO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with MAIFX having a 10.09% return and VOO slightly lower at 9.75%.

MAIFX

• 1D: 0.92%
• 1M: 2.54%
• YTD: 10.09%
• 6M: 10.39%
• 1Y: 26.94%
• 3Y*: 17.92%
• 5Y*: 9.53%
• 10Y*: —

VOO

• 1D: -0.29%
• 1M: 0.08%
• YTD: 9.75%
• 6M: 9.30%
• 1Y: 26.77%
• 3Y*: 21.36%
• 5Y*: 13.58%
• 10Y*: 15.77%

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

MAIFX vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
MAIFX Mutual of America International Fund	10.09%	37.23%	3.22%	16.96%	-12.81%	9.11%	926.37%
VOO Vanguard S&P 500 ETF	9.75%	17.82%	24.98%	26.32%	-18.17%	28.79%	18.32%

Correlation

The correlation between MAIFX and VOO is 0.70, 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	0.70
Correlation (3Y) Calculated over the trailing 3-year period	0.66
Correlation (5Y) Calculated over the trailing 5-year period	0.64
Correlation (All Time) Calculated using the full available price history since Jan 2, 2020	0.66

The correlation between MAIFX and VOO has been stable across timeframes, ranging from 0.64 to 0.70 - a consistent structural relationship.

Return for Risk

MAIFX vs. VOO — Risk / Return Rank

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

MAIFX

MAIFX Risk / Return Rank: 45
MAIFX Sharpe Ratio Rank: 44
MAIFX Sortino Ratio Rank: 47
MAIFX Omega Ratio Rank: 43
MAIFX Calmar Ratio Rank: 49
MAIFX Martin Ratio Rank: 44

VOO

VOO Risk / Return Rank: 68
VOO Sharpe Ratio Rank: 70
VOO Sortino Ratio Rank: 67
VOO Omega Ratio Rank: 69
VOO Calmar Ratio Rank: 63
VOO Martin Ratio Rank: 74

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.

MAIFX vs. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Mutual of America International Fund (MAIFX) and Vanguard S&P 500 ETF (VOO). 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.

	MAIFX	VOO	Difference
Sharpe ratio: Return per unit of total volatility	1.79	2.17	-0.38
Sortino ratio: Return per unit of downside risk	2.67	2.93	-0.26
Omega ratio: Gain probability vs. loss probability	1.32	1.39	-0.07
Calmar ratio: Return relative to maximum drawdown	2.53	3.02	-0.49
Martin ratio: Return relative to average drawdown	8.73	13.58	-4.85

MAIFX vs. VOO - Sharpe Ratio Comparison

The current MAIFX Sharpe Ratio is 1.79, which is comparable to the VOO Sharpe Ratio of 2.17. The chart below compares the historical Sharpe Ratios of MAIFX and VOO, 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

MAIFX vs. VOO - Drawdown Comparison

The maximum MAIFX drawdown since its inception was -33.70%, roughly equal to the maximum VOO drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for MAIFX and VOO.

Drawdown Indicators

	MAIFX	VOO	Difference
Max Drawdown Largest peak-to-trough decline	-33.70%	-33.99%	+0.29%
Max Drawdown (1Y) Largest decline over 1 year	-11.57%	-8.90%	-2.67%
Max Drawdown (3Y) Largest decline over 3 years	-12.87%	-18.69%	+5.82%
Max Drawdown (5Y) Largest decline over 5 years	-29.00%	-24.52%	-4.48%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.99%	—
Current Drawdown Current decline from peak	-1.30%	-1.74%	+0.44%
Average Drawdown Average peak-to-trough decline	-6.02%	-3.68%	-2.34%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.20%	1.98%	+1.22%

Volatility

MAIFX vs. VOO - Volatility Comparison

Mutual of America International Fund (MAIFX) has a higher volatility of 4.96% compared to Vanguard S&P 500 ETF (VOO) at 4.60%. This indicates that MAIFX's price experiences larger fluctuations and is considered to be riskier than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MAIFX	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.96%	4.60%	+0.36%
Volatility (6M) Calculated over the trailing 6-month period	13.64%	9.73%	+3.91%
Volatility (1Y) Calculated over the trailing 1-year period	16.37%	12.39%	+3.98%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.42%	16.90%	+1.52%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	378.13%	18.05%	+360.08%

MAIFX vs. VOO - Expense Ratio Comparison

MAIFX has a 0.13% expense ratio, which is higher than VOO's 0.03% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

MAIFX vs. VOO - Dividend Comparison

MAIFX's dividend yield for the trailing twelve months is around 3.08%, more than VOO's 1.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MAIFX Mutual of America International Fund	3.08%	3.39%	1.94%	3.77%	9.48%	9.92%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
VOO Vanguard S&P 500 ETF	1.04%	1.13%	1.24%	1.46%	1.69%	1.25%	1.54%	1.88%	2.06%	1.78%	2.02%	2.10%

Frequently Asked Questions

Can I hold both MAIFX and VOO in my portfolio?

MAIFX and VOO have a correlation of 0.70, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MAIFX or VOO?

MAIFX has higher volatility (4.96%) compared to VOO (4.60%). In terms of maximum drawdown, MAIFX dropped -33.70% vs VOO's -33.99%.

Which has better risk-adjusted returns?

VOO currently has the higher Sharpe Ratio (2.17 vs 1.79), 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.