AFIFX vs. PRNEX

Last updated Aug 6, 2026

AFIFX (American Funds Fundamental Investors Class F-1) and PRNEX (T. Rowe Price New Era Fund) are both mutual funds - AFIFX is a Large Cap Blend Equities fund actively managed by American Funds, while PRNEX is a Energy Equities fund managed by T. Rowe Price. Over the past 10 years, AFIFX returned 14.55%/yr vs 8.14%/yr for PRNEX. Their 0.78 correlation means they have sometimes moved together and sometimes differently. AFIFX charges 0.64%/yr vs 0.56%/yr for PRNEX.

Performance

AFIFX vs. PRNEX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Fundamental Investors Class F-1 (AFIFX) and T. Rowe Price New Era Fund (PRNEX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AFIFX achieves a 16.12% return, which is significantly lower than PRNEX's 17.60% return. Over the past 10 years, AFIFX has outperformed PRNEX with an annualized return of 14.55%, while PRNEX has yielded a comparatively lower 8.14% annualized return.

AFIFX

• 1D: 1.50%
• 1M: 1.69%
• 6M: 13.44%
• YTD: 16.12%
• 1Y: 27.99%
• 3Y*: 24.21%
• 5Y*: 14.29%
• 10Y*: 14.55%
• ALL TIME*: 10.71%

PRNEX

• 1D: 1.06%
• 1M: 3.90%
• 6M: 3.14%
• YTD: 17.60%
• 1Y: 30.23%
• 3Y*: 12.56%
• 5Y*: 11.37%
• 10Y*: 8.14%
• ALL TIME*: 7.94%

*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)
AFIFX American Funds Fundamental Investors Class F-1	$0.00	$0.00	$0.00
PRNEX T. Rowe Price New Era Fund	$0.00	$0.00	$0.00

AFIFX vs. PRNEX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AFIFX American Funds Fundamental Investors Class F-1	16.12%	24.12%	22.68%	25.78%	-16.69%	22.36%	14.85%	27.00%	-8.19%	22.70%
PRNEX T. Rowe Price New Era Fund	17.60%	18.85%	4.41%	1.02%	7.14%	25.35%	-2.63%	16.91%	-16.23%	10.57%

Correlation

The correlation between AFIFX and PRNEX is 0.41, which is low. Their historical price movements had little consistent relationship.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.41
Correlation (3Y) Balances recent behavior with more history.	0.49
Correlation (5Y) Shows whether the relationship held over a longer period.	0.62
Correlation (10Y) Provides a long-term view across more market conditions.	0.69
Correlation (All Time) Calculated using the full available price history since Jan 2, 2002	0.78

Over the past year, the correlation between AFIFX and PRNEX has dropped to 0.41 - well below their long-term average of 0.78, suggesting their price drivers have been diverging.

Return for Risk

AFIFX vs. PRNEX — Risk / Return Rank

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

AFIFX

AFIFX Risk / Return Rank: 63
AFIFX Sharpe Ratio Rank: 63
AFIFX Sortino Ratio Rank: 57
AFIFX Omega Ratio Rank: 55
AFIFX Calmar Ratio Rank: 64
AFIFX Martin Ratio Rank: 76

PRNEX

PRNEX Risk / Return Rank: 75
PRNEX Sharpe Ratio Rank: 80
PRNEX Sortino Ratio Rank: 74
PRNEX Omega Ratio Rank: 72
PRNEX Calmar Ratio Rank: 84
PRNEX Martin Ratio Rank: 65

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.

AFIFX vs. PRNEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Fundamental Investors Class F-1 (AFIFX) and T. Rowe Price New Era Fund (PRNEX). 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	PRNEX	Difference
Sharpe ratio: Return per unit of total volatility	1.79	2.04	-0.25
Sortino ratio: Return per unit of downside risk	2.46	2.75	-0.29
Omega ratio: Gain probability vs. loss probability	1.32	1.36	-0.04
Calmar ratio: Return relative to maximum drawdown	2.53	3.29	-0.76
Martin ratio: Return relative to average drawdown	10.90	9.68	+1.22

AFIFX vs. PRNEX - Sharpe Ratio Comparison

The current AFIFX Sharpe Ratio is 1.79, which is comparable to the PRNEX Sharpe Ratio of 2.04. The chart below compares the historical Sharpe Ratios of AFIFX and PRNEX, 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. PRNEX - Drawdown Comparison

The maximum AFIFX drawdown since its inception was -53.25%, smaller than the maximum PRNEX drawdown of -66.56%. Use the drawdown chart below to compare losses from any high point for AFIFX and PRNEX.

Drawdown Indicators

	AFIFX	PRNEX	Difference
Max Drawdown Largest peak-to-trough decline	-53.25%	-66.56%	+13.31%
Max Drawdown (1Y) Largest decline over 1 year	-10.67%	-9.52%	-1.15%
Max Drawdown (3Y) Largest decline over 3 years	-17.99%	-20.19%	+2.20%
Max Drawdown (5Y) Largest decline over 5 years	-25.11%	-21.50%	-3.61%
Max Drawdown (10Y) Largest decline over 10 years	-33.92%	-49.64%	+15.72%
Current Drawdown Current decline from peak	0.00%	-5.46%	+5.46%
Average Drawdown Average peak-to-trough decline	-7.33%	-16.26%	+8.93%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.47%	3.23%	-0.76%

Volatility

AFIFX vs. PRNEX - Volatility Comparison

American Funds Fundamental Investors Class F-1 (AFIFX) has a higher volatility of 4.56% compared to T. Rowe Price New Era Fund (PRNEX) at 4.21%. This indicates that AFIFX's price experiences larger fluctuations and is considered to be riskier than PRNEX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AFIFX	PRNEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.56%	4.21%	+0.35%
Volatility (6M) Calculated over the trailing 6-month period	12.22%	11.98%	+0.24%
Volatility (1Y) Calculated over the trailing 1-year period	15.16%	15.33%	-0.17%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.03%	18.70%	-1.67%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.77%	20.53%	-2.76%

AFIFX vs. PRNEX - Expense Ratio Comparison

AFIFX has a 0.64% expense ratio, which is higher than PRNEX's 0.56% expense ratio.

Dividends

AFIFX vs. PRNEX - Dividend Comparison

AFIFX's dividend yield for the trailing twelve months is around 7.12%, less than PRNEX's 7.69% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AFIFX American Funds Fundamental Investors Class F-1	7.12%	8.48%	8.84%	5.76%	4.92%	10.91%	2.57%	6.86%	9.21%	7.21%	4.65%	6.01%
PRNEX T. Rowe Price New Era Fund	7.69%	9.04%	4.81%	11.46%	4.47%	2.07%	2.54%	2.18%	1.69%	1.89%	1.28%	2.68%

Frequently Asked Questions

Can I hold both AFIFX and PRNEX in my portfolio?

AFIFX and PRNEX have a correlation of 0.41, 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 PRNEX?

AFIFX has higher volatility (4.56%) compared to PRNEX (4.21%). In terms of maximum drawdown, AFIFX dropped -53.25% vs PRNEX's -66.56%.

Which has better risk-adjusted returns?

PRNEX currently has the higher Sharpe Ratio (2.04 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.