NFFFX vs. WXCIX

Last updated Jul 14, 2026

NFFFX (American Funds New World Fund) and WXCIX (William Blair Emerging Markets ex China Growth Fund Class I) are both Emerging Markets Equities funds. Over the past 3 years, NFFFX returned 18.07%/yr vs 32.55%/yr for WXCIX. A 0.68 correlation means they provide meaningful diversification when combined. NFFFX charges 0.68%/yr vs 0.99%/yr for WXCIX.

Performance

NFFFX vs. WXCIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds New World Fund (NFFFX) and William Blair Emerging Markets ex China Growth Fund Class I (WXCIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NFFFX achieves a 15.37% return, which is significantly lower than WXCIX's 43.69% return.

NFFFX

• 1D: 0.26%
• 1M: 1.07%
• 6M: 10.11%
• YTD: 15.37%
• 1Y: 28.28%
• 3Y*: 18.07%
• 5Y*: 6.75%
• 10Y*: 10.84%

WXCIX

• 1D: -0.39%
• 1M: -1.88%
• 6M: 37.75%
• YTD: 43.69%
• 1Y: 70.54%
• 3Y*: 32.55%
• 5Y*: —
• 10Y*: —

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

NFFFX vs. WXCIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
NFFFX American Funds New World Fund	15.37%	28.52%	6.78%	7.81%
WXCIX William Blair Emerging Markets ex China Growth Fund Class I	43.69%	28.21%	13.49%	15.55%

Correlation

The correlation between NFFFX and WXCIX is 0.75, 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	0.75
Correlation (3Y) Calculated over the trailing 3-year period	0.68
Correlation (All Time) Calculated using the full available price history since May 17, 2023	0.68

The correlation between NFFFX and WXCIX has been stable across timeframes, ranging from 0.68 to 0.75 - a consistent structural relationship.

Return for Risk

NFFFX vs. WXCIX — Risk / Return Rank

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

NFFFX

NFFFX Risk / Return Rank: 52
NFFFX Sharpe Ratio Rank: 54
NFFFX Sortino Ratio Rank: 51
NFFFX Omega Ratio Rank: 59
NFFFX Calmar Ratio Rank: 48
NFFFX Martin Ratio Rank: 51

WXCIX

WXCIX Risk / Return Rank: 90
WXCIX Sharpe Ratio Rank: 94
WXCIX Sortino Ratio Rank: 84
WXCIX Omega Ratio Rank: 85
WXCIX Calmar Ratio Rank: 95
WXCIX Martin Ratio Rank: 93

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.

NFFFX vs. WXCIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds New World Fund (NFFFX) and William Blair Emerging Markets ex China Growth Fund Class I (WXCIX). 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.

	NFFFX	WXCIX	Difference
Sharpe ratio: Return per unit of total volatility	1.65	2.64	-0.99
Sortino ratio: Return per unit of downside risk	2.28	3.24	-0.96
Omega ratio: Gain probability vs. loss probability	1.32	1.46	-0.15
Calmar ratio: Return relative to maximum drawdown	2.13	4.71	-2.58
Martin ratio: Return relative to average drawdown	8.32	15.52	-7.20

NFFFX vs. WXCIX - Sharpe Ratio Comparison

The current NFFFX Sharpe Ratio is 1.65, which is lower than the WXCIX Sharpe Ratio of 2.64. The chart below compares the historical Sharpe Ratios of NFFFX and WXCIX, 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

NFFFX vs. WXCIX - Drawdown Comparison

The maximum NFFFX drawdown since its inception was -50.17%, which is greater than WXCIX's maximum drawdown of -19.66%. Use the drawdown chart below to compare losses from any high point for NFFFX and WXCIX.

Drawdown Indicators

	NFFFX	WXCIX	Difference
Max Drawdown Largest peak-to-trough decline	-50.17%	-19.66%	-30.51%
Max Drawdown (1Y) Largest decline over 1 year	-13.01%	-14.78%	+1.77%
Max Drawdown (3Y) Largest decline over 3 years	-15.05%	-19.66%	+4.61%
Max Drawdown (5Y) Largest decline over 5 years	-33.48%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-33.48%	—	—
Current Drawdown Current decline from peak	-2.85%	-9.98%	+7.13%
Average Drawdown Average peak-to-trough decline	-9.77%	-3.19%	-6.58%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.32%	4.47%	-1.15%

Volatility

NFFFX vs. WXCIX - Volatility Comparison

The current volatility for American Funds New World Fund (NFFFX) is 7.22%, while William Blair Emerging Markets ex China Growth Fund Class I (WXCIX) has a volatility of 12.50%. This indicates that NFFFX experiences smaller price fluctuations and is considered to be less risky than WXCIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NFFFX	WXCIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.22%	12.50%	-5.28%
Volatility (6M) Calculated over the trailing 6-month period	14.94%	23.87%	-8.93%
Volatility (1Y) Calculated over the trailing 1-year period	16.77%	26.38%	-9.61%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.83%	19.44%	-3.61%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.22%	19.44%	-3.22%

NFFFX vs. WXCIX - Expense Ratio Comparison

NFFFX has a 0.68% expense ratio, which is lower than WXCIX's 0.99% expense ratio.

Dividends

NFFFX vs. WXCIX - Dividend Comparison

NFFFX's dividend yield for the trailing twelve months is around 5.21%, more than WXCIX's 3.84% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NFFFX American Funds New World Fund	5.21%	6.01%	4.01%	2.78%	1.21%	7.23%	0.35%	3.95%	2.62%	2.17%	1.28%	0.94%
WXCIX William Blair Emerging Markets ex China Growth Fund Class I	3.84%	5.52%	0.00%	0.83%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both NFFFX and WXCIX in my portfolio?

NFFFX and WXCIX have a correlation of 0.75, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NFFFX or WXCIX?

WXCIX has higher volatility (12.50%) compared to NFFFX (7.22%). In terms of maximum drawdown, NFFFX dropped -50.17% vs WXCIX's -19.66%.

Which has better risk-adjusted returns?

WXCIX currently has the higher Sharpe Ratio (2.64 vs 1.65), 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.