FUNFX vs. FNDB

Last updated Aug 1, 2026

FUNFX (American Funds Fundamental Investors® Class F-3) and FNDB (Schwab Fundamental U.S. Broad Market Index ETF) are both funds - FUNFX is a Large Cap Blend Equities fund managed by American Funds, while FNDB is a Large Cap Value Equities fund tracking the RAFI Fundamental High Liquidity US All Index. Over the past 5 years, FUNFX returned 14.09%/yr vs 13.39%/yr for FNDB. Their correlation of 0.87 means they have usually moved in the same direction. FUNFX charges 0.28%/yr vs 0.25%/yr for FNDB.

Performance

FUNFX vs. FNDB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Fundamental Investors® Class F-3 (FUNFX) and Schwab Fundamental U.S. Broad Market Index ETF (FNDB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FUNFX achieves a 12.31% return, which is significantly lower than FNDB's 17.51% return.

FUNFX

• 1D: 2.12%
• 1M: -0.96%
• 6M: 8.14%
• YTD: 12.31%
• 1Y: 25.01%
• 3Y*: 22.37%
• 5Y*: 14.09%
• 10Y*: —
• ALL TIME*: 14.50%

FNDB

• 1D: 0.10%
• 1M: 1.21%
• 6M: 12.62%
• YTD: 17.51%
• 1Y: 32.18%
• 3Y*: 18.54%
• 5Y*: 13.39%
• 10Y*: 14.03%
• ALL TIME*: 12.99%

*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)
FNDB Schwab Fundamental U.S. Broad Market Index ETF	$5.69M	$5.14M	$4.73M
FUNFX American Funds Fundamental Investors® Class F-3	$0.00	$0.00	$0.00

FUNFX vs. FNDB - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FUNFX American Funds Fundamental Investors® Class F-3	12.31%	24.57%	23.13%	26.25%	-16.38%	22.81%	15.28%	27.47%	-7.87%	19.59%
FNDB Schwab Fundamental U.S. Broad Market Index ETF	17.51%	16.23%	16.25%	18.42%	-7.53%	31.55%	9.40%	28.88%	-8.20%	15.83%

Correlation

The correlation between FUNFX and FNDB is 0.72, 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.	0.72
Correlation (3Y) Balances recent behavior with more history.	0.79
Correlation (5Y) Shows whether the relationship held over a longer period.	0.86
Correlation (All Time) Calculated using the full available price history since Feb 1, 2017	0.87

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

Return for Risk

FUNFX vs. FNDB — Risk / Return Rank

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

FUNFX

FUNFX Risk / Return Rank: 64
FUNFX Sharpe Ratio Rank: 62
FUNFX Sortino Ratio Rank: 59
FUNFX Omega Ratio Rank: 58
FUNFX Calmar Ratio Rank: 64
FUNFX Martin Ratio Rank: 76

FNDB

FNDB Risk / Return Rank: 95
FNDB Sharpe Ratio Rank: 96
FNDB Sortino Ratio Rank: 95
FNDB Omega Ratio Rank: 95
FNDB Calmar Ratio Rank: 94
FNDB Martin Ratio Rank: 95

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.

FUNFX vs. FNDB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Fundamental Investors® Class F-3 (FUNFX) and Schwab Fundamental U.S. Broad Market Index ETF (FNDB). 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.

	FUNFX	FNDB	Difference
Sharpe ratio: Return per unit of total volatility	1.49	2.83	-1.34
Sortino ratio: Return per unit of downside risk	2.09	3.92	-1.83
Omega ratio: Gain probability vs. loss probability	1.27	1.52	-0.26
Calmar ratio: Return relative to maximum drawdown	2.13	4.84	-2.71
Martin ratio: Return relative to average drawdown	9.21	19.07	-9.87

FUNFX vs. FNDB - Sharpe Ratio Comparison

The current FUNFX Sharpe Ratio is 1.49, which is lower than the FNDB Sharpe Ratio of 2.83. The chart below compares the historical Sharpe Ratios of FUNFX and FNDB, 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

FUNFX vs. FNDB - Drawdown Comparison

The maximum FUNFX drawdown since its inception was -33.92%, smaller than the maximum FNDB drawdown of -38.17%. Use the drawdown chart below to compare losses from any high point for FUNFX and FNDB.

Drawdown Indicators

	FUNFX	FNDB	Difference
Max Drawdown Largest peak-to-trough decline	-33.92%	-38.17%	+4.25%
Max Drawdown (1Y) Largest decline over 1 year	-10.62%	-6.29%	-4.33%
Max Drawdown (3Y) Largest decline over 3 years	-17.93%	-16.83%	-1.10%
Max Drawdown (5Y) Largest decline over 5 years	-24.88%	-19.29%	-5.59%
Max Drawdown (10Y) Largest decline over 10 years	—	-38.17%	—
Current Drawdown Current decline from peak	-2.57%	-0.43%	-2.14%
Average Drawdown Average peak-to-trough decline	-4.66%	-3.62%	-1.04%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.45%	1.60%	+0.85%

Volatility

FUNFX vs. FNDB - Volatility Comparison

American Funds Fundamental Investors® Class F-3 (FUNFX) has a higher volatility of 4.21% compared to Schwab Fundamental U.S. Broad Market Index ETF (FNDB) at 2.32%. This indicates that FUNFX's price experiences larger fluctuations and is considered to be riskier than FNDB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FUNFX	FNDB	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.21%	2.32%	+1.89%
Volatility (6M) Calculated over the trailing 6-month period	12.13%	7.65%	+4.48%
Volatility (1Y) Calculated over the trailing 1-year period	15.16%	10.77%	+4.39%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.01%	15.23%	+1.78%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.11%	17.42%	+0.69%

FUNFX vs. FNDB - Expense Ratio Comparison

FUNFX has a 0.28% expense ratio, which is higher than FNDB's 0.25% expense ratio.

Dividends

FUNFX vs. FNDB - Dividend Comparison

FUNFX's dividend yield for the trailing twelve months is around 7.72%, more than FNDB's 1.43% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FNDB Schwab Fundamental U.S. Broad Market Index ETF	1.43%	1.62%	1.74%	1.80%	1.98%	1.63%	2.15%	2.23%	2.41%	1.91%	2.06%	2.26%
FUNFX American Funds Fundamental Investors® Class F-3	7.72%	8.83%	9.21%	6.10%	5.33%	11.29%	2.90%	7.21%	9.65%	7.57%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FUNFX and FNDB in my portfolio?

FUNFX and FNDB 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, FUNFX or FNDB?

FUNFX has higher volatility (4.21%) compared to FNDB (2.32%). In terms of maximum drawdown, FUNFX dropped -33.92% vs FNDB's -38.17%.

Which has better risk-adjusted returns?

FNDB currently has the higher Sharpe Ratio (2.83 vs 1.49), 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.