NEWFX vs. COBYX

Last updated Jun 24, 2026

NEWFX (American Funds New World Fund) and COBYX (The Cook & Bynum Fund) are both Emerging Markets Diversified funds. Over the past 10 years, NEWFX returned 11.48%/yr vs 4.66%/yr for COBYX. A 0.57 correlation means they provide meaningful diversification when combined. NEWFX charges 0.96%/yr vs 1.49%/yr for COBYX.

Performance

NEWFX vs. COBYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds New World Fund (NEWFX) and The Cook & Bynum Fund (COBYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NEWFX achieves a 18.61% return, which is significantly higher than COBYX's 8.92% return. Over the past 10 years, NEWFX has outperformed COBYX with an annualized return of 11.48%, while COBYX has yielded a comparatively lower 4.66% annualized return.

NEWFX

• 1D: 0.53%
• 1M: 5.56%
• YTD: 18.61%
• 6M: 18.69%
• 1Y: 36.61%
• 3Y*: 19.46%
• 5Y*: 6.93%
• 10Y*: 11.48%

COBYX

• 1D: -0.42%
• 1M: -2.39%
• YTD: 8.92%
• 6M: 8.18%
• 1Y: 14.37%
• 3Y*: 7.28%
• 5Y*: 8.01%
• 10Y*: 4.66%

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

NEWFX vs. COBYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NEWFX American Funds New World Fund	18.61%	28.16%	6.45%	15.75%	-22.08%	4.69%	24.79%	27.51%	-12.32%	32.56%
COBYX The Cook & Bynum Fund	8.92%	20.50%	-10.32%	16.73%	9.28%	9.05%	-10.97%	9.40%	-13.40%	15.12%

Correlation

The correlation between NEWFX and COBYX is 0.37, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.37
Correlation (3Y) Calculated over the trailing 3-year period	0.45
Correlation (5Y) Calculated over the trailing 5-year period	0.54
Correlation (10Y) Calculated over the trailing 10-year period	0.56
Correlation (All Time) Calculated using the full available price history since Jan 2, 2013	0.57

The correlation between NEWFX and COBYX shifts across timeframes, from 0.37 (1 year) to 0.57 (all time), reflecting how their relationship changes across market environments.

Return for Risk

NEWFX vs. COBYX — Risk / Return Rank

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

NEWFX

NEWFX Risk / Return Rank: 68
NEWFX Sharpe Ratio Rank: 74
NEWFX Sortino Ratio Rank: 67
NEWFX Omega Ratio Rank: 75
NEWFX Calmar Ratio Rank: 61
NEWFX Martin Ratio Rank: 61

COBYX

COBYX Risk / Return Rank: 24
COBYX Sharpe Ratio Rank: 23
COBYX Sortino Ratio Rank: 25
COBYX Omega Ratio Rank: 22
COBYX Calmar Ratio Rank: 24
COBYX Martin Ratio Rank: 24

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.

NEWFX vs. COBYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds New World Fund (NEWFX) and The Cook & Bynum Fund (COBYX). 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.

	NEWFX	COBYX	Difference
Sharpe ratio: Return per unit of total volatility	2.31	1.27	+1.04
Sortino ratio: Return per unit of downside risk	3.11	1.90	+1.21
Omega ratio: Gain probability vs. loss probability	1.44	1.23	+0.22
Calmar ratio: Return relative to maximum drawdown	2.86	1.69	+1.18
Martin ratio: Return relative to average drawdown	11.44	5.43	+6.02

NEWFX vs. COBYX - Sharpe Ratio Comparison

The current NEWFX Sharpe Ratio is 2.31, which is higher than the COBYX Sharpe Ratio of 1.27. The chart below compares the historical Sharpe Ratios of NEWFX and COBYX, 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

NEWFX vs. COBYX - Drawdown Comparison

The maximum NEWFX drawdown since its inception was -56.71%, which is greater than COBYX's maximum drawdown of -34.18%. Use the drawdown chart below to compare losses from any high point for NEWFX and COBYX.

Drawdown Indicators

	NEWFX	COBYX	Difference
Max Drawdown Largest peak-to-trough decline	-56.71%	-34.18%	-22.53%
Max Drawdown (1Y) Largest decline over 1 year	-13.03%	-8.95%	-4.08%
Max Drawdown (3Y) Largest decline over 3 years	-15.18%	-16.29%	+1.11%
Max Drawdown (5Y) Largest decline over 5 years	-33.68%	-17.10%	-16.58%
Max Drawdown (10Y) Largest decline over 10 years	-33.68%	-34.18%	+0.50%
Current Drawdown Current decline from peak	0.00%	-2.74%	+2.74%
Average Drawdown Average peak-to-trough decline	-11.72%	-6.78%	-4.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.25%	2.79%	+0.46%

Volatility

NEWFX vs. COBYX - Volatility Comparison

American Funds New World Fund (NEWFX) has a higher volatility of 7.60% compared to The Cook & Bynum Fund (COBYX) at 2.98%. This indicates that NEWFX's price experiences larger fluctuations and is considered to be riskier than COBYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NEWFX	COBYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.60%	2.98%	+4.62%
Volatility (6M) Calculated over the trailing 6-month period	14.28%	9.55%	+4.73%
Volatility (1Y) Calculated over the trailing 1-year period	16.22%	11.91%	+4.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.72%	13.99%	+1.73%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.26%	13.66%	+2.60%

NEWFX vs. COBYX - Expense Ratio Comparison

NEWFX has a 0.96% expense ratio, which is lower than COBYX's 1.49% expense ratio.

Dividends

NEWFX vs. COBYX - Dividend Comparison

NEWFX's dividend yield for the trailing twelve months is around 4.81%, more than COBYX's 1.08% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COBYX The Cook & Bynum Fund	1.08%	1.18%	0.00%	1.01%	1.16%	2.18%	0.32%	0.69%	12.60%	1.88%	5.09%	0.00%
NEWFX American Funds New World Fund	4.81%	5.71%	3.66%	2.46%	0.89%	6.89%	0.10%	3.65%	2.26%	1.90%	0.92%	0.60%

Frequently Asked Questions

Can I hold both NEWFX and COBYX in my portfolio?

NEWFX and COBYX have a correlation of 0.37, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NEWFX or COBYX?

NEWFX has higher volatility (7.60%) compared to COBYX (2.98%). In terms of maximum drawdown, NEWFX dropped -56.71% vs COBYX's -34.18%.

Which has better risk-adjusted returns?

NEWFX currently has the higher Sharpe Ratio (2.31 vs 1.27), 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.