AFIFX vs. FTZIX

Last updated Jun 25, 2026

AFIFX (American Funds Fundamental Investors Class F-1) and FTZIX (Fuller & Thaler Behavioral Unconstrained Equity Fund) are both Large Cap Blend Equities funds. Over the past 5 years, AFIFX returned 13.99%/yr vs 14.12%/yr for FTZIX. Their correlation of 0.87 suggests significant overlap in exposure. AFIFX charges 0.64%/yr vs 1.12%/yr for FTZIX.

Performance

AFIFX vs. FTZIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Fundamental Investors Class F-1 (AFIFX) and Fuller & Thaler Behavioral Unconstrained Equity Fund (FTZIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AFIFX achieves a 12.23% return, which is significantly lower than FTZIX's 19.86% return.

AFIFX

• 1D: -1.73%
• 1M: 0.13%
• YTD: 12.23%
• 6M: 11.48%
• 1Y: 27.16%
• 3Y*: 24.45%
• 5Y*: 13.99%
• 10Y*: 14.91%

FTZIX

• 1D: -1.55%
• 1M: 6.45%
• YTD: 19.86%
• 6M: 17.49%
• 1Y: 41.34%
• 3Y*: 27.49%
• 5Y*: 14.12%
• 10Y*: —

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

AFIFX vs. FTZIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
AFIFX American Funds Fundamental Investors Class F-1	12.23%	24.12%	22.68%	25.78%	-16.69%	22.36%	14.85%	27.00%	0.65%
FTZIX Fuller & Thaler Behavioral Unconstrained Equity Fund	19.86%	22.63%	25.31%	27.18%	-21.31%	25.25%	19.60%	33.70%	0.00%

Correlation

The correlation between AFIFX and FTZIX is 0.72, 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	0.72
Correlation (3Y) Calculated over the trailing 3-year period	0.79
Correlation (5Y) Calculated over the trailing 5-year period	0.86
Correlation (All Time) Calculated using the full available price history since Dec 31, 2018	0.87

The correlation between AFIFX and FTZIX shifts across timeframes, from 0.72 (1 year) to 0.87 (all time), reflecting how their relationship changes across market environments.

Return for Risk

AFIFX vs. FTZIX — Risk / Return Rank

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

AFIFX

AFIFX Risk / Return Rank: 60
AFIFX Sharpe Ratio Rank: 58
AFIFX Sortino Ratio Rank: 54
AFIFX Omega Ratio Rank: 54
AFIFX Calmar Ratio Rank: 60
AFIFX Martin Ratio Rank: 72

FTZIX

FTZIX Risk / Return Rank: 86
FTZIX Sharpe Ratio Rank: 87
FTZIX Sortino Ratio Rank: 84
FTZIX Omega Ratio Rank: 74
FTZIX Calmar Ratio Rank: 93
FTZIX Martin Ratio Rank: 94

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.

AFIFX vs. FTZIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Fundamental Investors Class F-1 (AFIFX) and Fuller & Thaler Behavioral Unconstrained Equity Fund (FTZIX). 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.

	AFIFX	FTZIX	Difference
Sharpe ratio: Return per unit of total volatility	1.99	2.59	-0.60
Sortino ratio: Return per unit of downside risk	2.70	3.64	-0.94
Omega ratio: Gain probability vs. loss probability	1.36	1.43	-0.07
Calmar ratio: Return relative to maximum drawdown	2.74	4.81	-2.06
Martin ratio: Return relative to average drawdown	12.32	18.55	-6.24

AFIFX vs. FTZIX - Sharpe Ratio Comparison

The current AFIFX Sharpe Ratio is 1.99, which is comparable to the FTZIX Sharpe Ratio of 2.59. The chart below compares the historical Sharpe Ratios of AFIFX and FTZIX, 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

AFIFX vs. FTZIX - Drawdown Comparison

The maximum AFIFX drawdown since its inception was -53.25%, which is greater than FTZIX's maximum drawdown of -37.22%. Use the drawdown chart below to compare losses from any high point for AFIFX and FTZIX.

Drawdown Indicators

	AFIFX	FTZIX	Difference
Max Drawdown Largest peak-to-trough decline	-53.25%	-37.22%	-16.03%
Max Drawdown (1Y) Largest decline over 1 year	-10.67%	-9.03%	-1.64%
Max Drawdown (3Y) Largest decline over 3 years	-17.99%	-18.65%	+0.66%
Max Drawdown (5Y) Largest decline over 5 years	-25.11%	-29.53%	+4.42%
Max Drawdown (10Y) Largest decline over 10 years	-33.92%	—	—
Current Drawdown Current decline from peak	-2.49%	-1.55%	-0.94%
Average Drawdown Average peak-to-trough decline	-7.36%	-6.46%	-0.90%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.37%	2.33%	+0.04%

Volatility

AFIFX vs. FTZIX - Volatility Comparison

American Funds Fundamental Investors Class F-1 (AFIFX) has a higher volatility of 5.88% compared to Fuller & Thaler Behavioral Unconstrained Equity Fund (FTZIX) at 5.42%. This indicates that AFIFX's price experiences larger fluctuations and is considered to be riskier than FTZIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AFIFX	FTZIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.88%	5.42%	+0.46%
Volatility (6M) Calculated over the trailing 6-month period	11.82%	13.45%	-1.63%
Volatility (1Y) Calculated over the trailing 1-year period	14.73%	16.80%	-2.07%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.95%	19.53%	-2.58%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.75%	22.33%	-4.58%

AFIFX vs. FTZIX - Expense Ratio Comparison

AFIFX has a 0.64% expense ratio, which is lower than FTZIX's 1.12% expense ratio.

Dividends

AFIFX vs. FTZIX - Dividend Comparison

AFIFX's dividend yield for the trailing twelve months is around 7.36%, more than FTZIX's 0.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AFIFX American Funds Fundamental Investors Class F-1	7.36%	8.48%	8.84%	5.76%	4.92%	10.91%	2.57%	6.86%	9.21%	7.21%	4.65%	6.01%
FTZIX Fuller & Thaler Behavioral Unconstrained Equity Fund	0.04%	0.05%	0.11%	0.19%	0.00%	0.00%	0.26%	0.76%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both AFIFX and FTZIX in my portfolio?

AFIFX and FTZIX have a correlation of 0.72, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, AFIFX or FTZIX?

AFIFX has higher volatility (5.88%) compared to FTZIX (5.42%). In terms of maximum drawdown, AFIFX dropped -53.25% vs FTZIX's -37.22%.

Which has better risk-adjusted returns?

FTZIX currently has the higher Sharpe Ratio (2.59 vs 1.99), 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.