WBSIX vs. WXCIX

Last updated Jun 4, 2026

WBSIX (William Blair Small Cap Growth Fund) and WXCIX (William Blair Emerging Markets ex China Growth Fund Class I) are both mutual funds - WBSIX is a Small Cap Growth Equities fund managed by William Blair, while WXCIX is a Emerging Markets Equities fund actively managed by William Blair. Over the past 3 years, WBSIX returned 19.68%/yr vs 35.63%/yr for WXCIX. At a 0.39 correlation, their price movements are largely independent. WBSIX charges 1.25%/yr vs 0.99%/yr for WXCIX.

Performance

WBSIX vs. WXCIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in William Blair Small Cap Growth Fund (WBSIX) 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, WBSIX achieves a 16.21% return, which is significantly lower than WXCIX's 52.50% return.

WBSIX

• 1D: 1.44%
• 1M: 5.64%
• YTD: 16.21%
• 6M: 16.70%
• 1Y: 31.29%
• 3Y*: 19.68%
• 5Y*: 8.35%
• 10Y*: 14.81%

WXCIX

• 1D: 0.87%
• 1M: 15.91%
• YTD: 52.50%
• 6M: 58.75%
• 1Y: 92.32%
• 3Y*: 35.63%
• 5Y*: —
• 10Y*: —

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

WBSIX vs. WXCIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
WBSIX William Blair Small Cap Growth Fund	16.21%	3.03%	32.88%	10.38%
WXCIX William Blair Emerging Markets ex China Growth Fund Class I	52.50%	28.21%	13.49%	15.55%

Correlation

The correlation between WBSIX and WXCIX is 0.33, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.33
Correlation (3Y) Calculated over the trailing 3-year period	0.39
Correlation (All Time) Calculated using the full available price history since May 18, 2023	0.39

Return for Risk

WBSIX vs. WXCIX — Risk / Return Rank

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

WBSIX

WBSIX Risk / Return Rank: 38
WBSIX Sharpe Ratio Rank: 34
WBSIX Sortino Ratio Rank: 33
WBSIX Omega Ratio Rank: 29
WBSIX Calmar Ratio Rank: 47
WBSIX Martin Ratio Rank: 45

WXCIX

WXCIX Risk / Return Rank: 95
WXCIX Sharpe Ratio Rank: 99
WXCIX Sortino Ratio Rank: 95
WXCIX Omega Ratio Rank: 93
WXCIX Calmar Ratio Rank: 96
WXCIX Martin Ratio Rank: 95

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.

WBSIX vs. WXCIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for William Blair Small Cap Growth Fund (WBSIX) 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.

	WBSIX	WXCIX	Difference
Sharpe ratio Return per unit of total volatility	1.67	4.17	-2.50
Sortino ratio Return per unit of downside risk	2.41	5.00	-2.59
Omega ratio Gain probability vs. loss probability	1.28	1.71	-0.43
Calmar ratio Return relative to maximum drawdown	2.62	6.14	-3.52
Martin ratio Return relative to average drawdown	9.46	22.15	-12.69
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WBSIX vs. WXCIX - Sharpe Ratio Comparison

The current WBSIX Sharpe Ratio is 1.67, which is lower than the WXCIX Sharpe Ratio of 4.17. The chart below compares the historical Sharpe Ratios of WBSIX 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.

Sharpe Ratios by Period

	WBSIX	WXCIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.67	4.17	-2.50
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.35	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.65	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.54	2.04	-1.49

Drawdowns

WBSIX vs. WXCIX - Drawdown Comparison

The maximum WBSIX drawdown since its inception was -62.35%, which is greater than WXCIX's maximum drawdown of -19.66%. Use the drawdown chart below to compare losses from any high point for WBSIX and WXCIX.

Drawdown Indicators

	WBSIX	WXCIX	Difference
Max Drawdown Largest peak-to-trough decline	-62.35%	-19.66%	-42.69%
Max Drawdown (1Y) Largest decline over 1 year	-12.75%	-14.78%	+2.03%
Max Drawdown (3Y) Largest decline over 3 years	-24.76%	-19.66%	-5.10%
Max Drawdown (5Y) Largest decline over 5 years	-38.13%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-39.16%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-11.14%	-3.15%	-7.99%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.51%	4.10%	-0.59%

Volatility

WBSIX vs. WXCIX - Volatility Comparison

The current volatility for William Blair Small Cap Growth Fund (WBSIX) is 5.64%, while William Blair Emerging Markets ex China Growth Fund Class I (WXCIX) has a volatility of 10.22%. This indicates that WBSIX 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

	WBSIX	WXCIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.64%	10.22%	-4.58%
Volatility (6M) Calculated over the trailing 6-month period	14.48%	19.50%	-5.02%
Volatility (1Y) Calculated over the trailing 1-year period	20.00%	22.52%	-2.52%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.85%	17.99%	+5.86%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.03%	17.99%	+5.04%

WBSIX vs. WXCIX - Expense Ratio Comparison

WBSIX has a 1.25% expense ratio, which is higher than WXCIX's 0.99% expense ratio.

Dividends

WBSIX vs. WXCIX - Dividend Comparison

WBSIX's dividend yield for the trailing twelve months is around 6.44%, more than WXCIX's 3.62% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
WBSIX William Blair Small Cap Growth Fund	6.44%	7.49%	20.14%	1.53%	3.55%	17.85%	9.73%	2.07%	12.60%	16.89%	5.42%	8.25%
WXCIX William Blair Emerging Markets ex China Growth Fund Class I	3.62%	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 WBSIX and WXCIX in my portfolio?

WBSIX and WXCIX have a correlation of 0.33, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, WBSIX or WXCIX?

WXCIX has higher volatility (10.22%) compared to WBSIX (5.64%). In terms of maximum drawdown, WBSIX dropped -62.35% vs WXCIX's -19.66%.

Which has better risk-adjusted returns?

WXCIX currently has the higher Sharpe Ratio (4.17 vs 1.67), 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.