WMKSX vs. WBSIX

Last updated Jun 4, 2026

WMKSX (WesMark Small Company Fund) and WBSIX (William Blair Small Cap Growth Fund) are both Small Cap Growth Equities funds. Over the past 10 years, WMKSX returned 13.28%/yr vs 14.81%/yr for WBSIX. Their correlation of 0.88 suggests significant overlap in exposure. WMKSX charges 1.24%/yr vs 1.25%/yr for WBSIX.

Performance

WMKSX vs. WBSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in WesMark Small Company Fund (WMKSX) and William Blair Small Cap Growth Fund (WBSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with WMKSX having a 15.68% return and WBSIX slightly higher at 16.21%. Over the past 10 years, WMKSX has underperformed WBSIX with an annualized return of 13.28%, while WBSIX has yielded a comparatively higher 14.81% annualized return.

WMKSX

• 1D: 0.60%
• 1M: 2.80%
• YTD: 15.68%
• 6M: 13.63%
• 1Y: 31.01%
• 3Y*: 23.77%
• 5Y*: 10.53%
• 10Y*: 13.28%

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%

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

WMKSX vs. WBSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
WMKSX WesMark Small Company Fund	15.68%	16.19%	22.12%	19.42%	-20.72%	22.81%	36.78%	20.32%	-13.92%	13.21%
WBSIX William Blair Small Cap Growth Fund	16.21%	3.03%	32.88%	16.38%	-21.46%	12.64%	38.87%	22.53%	-2.08%	26.81%

Correlation

The correlation between WMKSX and WBSIX is 0.93, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.92
Correlation (All Time) Calculated using the full available price history since Dec 28, 1999	0.88

The correlation between WMKSX and WBSIX has been stable across timeframes, ranging from 0.88 to 0.93 - a consistent structural relationship.

Return for Risk

WMKSX vs. WBSIX — Risk / Return Rank

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

WMKSX

WMKSX Risk / Return Rank: 54
WMKSX Sharpe Ratio Rank: 42
WMKSX Sortino Ratio Rank: 40
WMKSX Omega Ratio Rank: 37
WMKSX Calmar Ratio Rank: 84
WMKSX Martin Ratio Rank: 69

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

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.

WMKSX vs. WBSIX - Risk-Adjusted Trends Comparison

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

	WMKSX	WBSIX	Difference
Sharpe ratio Return per unit of total volatility	1.90	1.67	+0.23
Sortino ratio Return per unit of downside risk	2.68	2.41	+0.27
Omega ratio Gain probability vs. loss probability	1.32	1.28	+0.04
Calmar ratio Return relative to maximum drawdown	3.96	2.62	+1.35
Martin ratio Return relative to average drawdown	13.23	9.46	+3.77
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WMKSX vs. WBSIX - Sharpe Ratio Comparison

The current WMKSX Sharpe Ratio is 1.90, which is comparable to the WBSIX Sharpe Ratio of 1.67. The chart below compares the historical Sharpe Ratios of WMKSX and WBSIX, 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

	WMKSX	WBSIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.90	1.67	+0.23
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.41	0.35	+0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	0.65	-0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.37	0.54	-0.17

Drawdowns

WMKSX vs. WBSIX - Drawdown Comparison

The maximum WMKSX drawdown since its inception was -64.09%, roughly equal to the maximum WBSIX drawdown of -62.35%. Use the drawdown chart below to compare losses from any high point for WMKSX and WBSIX.

Drawdown Indicators

	WMKSX	WBSIX	Difference
Max Drawdown Largest peak-to-trough decline	-64.09%	-62.35%	-1.74%
Max Drawdown (1Y) Largest decline over 1 year	-8.50%	-12.75%	+4.25%
Max Drawdown (3Y) Largest decline over 3 years	-24.20%	-24.76%	+0.56%
Max Drawdown (5Y) Largest decline over 5 years	-39.84%	-38.13%	-1.71%
Max Drawdown (10Y) Largest decline over 10 years	-39.84%	-39.16%	-0.68%
Current Drawdown Current decline from peak	-0.35%	0.00%	-0.35%
Average Drawdown Average peak-to-trough decline	-15.68%	-11.14%	-4.54%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.54%	3.51%	-0.97%

Volatility

WMKSX vs. WBSIX - Volatility Comparison

The current volatility for WesMark Small Company Fund (WMKSX) is 4.76%, while William Blair Small Cap Growth Fund (WBSIX) has a volatility of 5.64%. This indicates that WMKSX experiences smaller price fluctuations and is considered to be less risky than WBSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	WMKSX	WBSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.76%	5.64%	-0.88%
Volatility (6M) Calculated over the trailing 6-month period	12.05%	14.48%	-2.43%
Volatility (1Y) Calculated over the trailing 1-year period	17.71%	20.00%	-2.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.10%	23.85%	+2.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.97%	23.03%	+0.94%

WMKSX vs. WBSIX - Expense Ratio Comparison

WMKSX has a 1.24% expense ratio, which is lower than WBSIX's 1.25% expense ratio.

Dividends

WMKSX vs. WBSIX - Dividend Comparison

WMKSX's dividend yield for the trailing twelve months is around 19.80%, more than WBSIX's 6.44% 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%
WMKSX WesMark Small Company Fund	19.80%	22.91%	4.69%	5.93%	6.23%	25.75%	8.21%	0.00%	12.53%	8.59%	5.26%	6.57%

Frequently Asked Questions

Can I hold both WMKSX and WBSIX in my portfolio?

With a correlation of 0.93, WMKSX and WBSIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, WMKSX or WBSIX?

WBSIX has higher volatility (5.64%) compared to WMKSX (4.76%). In terms of maximum drawdown, WMKSX dropped -64.09% vs WBSIX's -62.35%.

Which has better risk-adjusted returns?

WMKSX currently has the higher Sharpe Ratio (1.90 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.