VFSAX vs. OAKEX

Last updated Jul 15, 2026

VFSAX (Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares) and OAKEX (Oakmark International Small Cap Fund) are both Foreign Small & Mid Cap Equities funds. Over the past 5 years, VFSAX returned 5.08%/yr vs 4.24%/yr for OAKEX. Their correlation of 0.84 suggests significant overlap in exposure. VFSAX charges 0.16%/yr vs 1.34%/yr for OAKEX.

Performance

VFSAX vs. OAKEX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares (VFSAX) and Oakmark International Small Cap Fund (OAKEX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VFSAX achieves a 6.29% return, which is significantly higher than OAKEX's -1.09% return.

VFSAX

• 1D: -1.53%
• 1M: -3.13%
• 6M: 3.03%
• YTD: 6.29%
• 1Y: 15.87%
• 3Y*: 13.47%
• 5Y*: 5.08%
• 10Y*: —

OAKEX

• 1D: 0.65%
• 1M: 0.32%
• 6M: -1.50%
• YTD: -1.09%
• 1Y: -0.86%
• 3Y*: 8.83%
• 5Y*: 4.24%
• 10Y*: 7.97%

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

VFSAX vs. OAKEX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
VFSAX Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares	6.29%	29.89%	2.58%	15.13%	-21.30%	12.68%	11.90%	13.47%
OAKEX Oakmark International Small Cap Fund	-1.09%	29.51%	-3.00%	19.59%	-14.50%	17.90%	5.00%	18.24%

Correlation

The correlation between VFSAX and OAKEX is 0.76, 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	0.76
Correlation (3Y) Calculated over the trailing 3-year period	0.79
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (All Time) Calculated using the full available price history since Feb 7, 2019	0.84

The correlation between VFSAX and OAKEX has been stable across timeframes, ranging from 0.76 to 0.85 - a consistent structural relationship.

Return for Risk

VFSAX vs. OAKEX — Risk / Return Rank

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

VFSAX

VFSAX Risk / Return Rank: 27
VFSAX Sharpe Ratio Rank: 28
VFSAX Sortino Ratio Rank: 26
VFSAX Omega Ratio Rank: 28
VFSAX Calmar Ratio Rank: 25
VFSAX Martin Ratio Rank: 28

OAKEX

OAKEX Risk / Return Rank: 3
OAKEX Sharpe Ratio Rank: 3
OAKEX Sortino Ratio Rank: 3
OAKEX Omega Ratio Rank: 3
OAKEX Calmar Ratio Rank: 3
OAKEX Martin Ratio Rank: 3

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.

VFSAX vs. OAKEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares (VFSAX) and Oakmark International Small Cap Fund (OAKEX). 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.

	VFSAX	OAKEX	Difference
Sharpe ratio: Return per unit of total volatility	1.12	-0.09	+1.21
Sortino ratio: Return per unit of downside risk	1.59	-0.02	+1.61
Omega ratio: Gain probability vs. loss probability	1.21	1.00	+0.21
Calmar ratio: Return relative to maximum drawdown	1.41	-0.08	+1.49
Martin ratio: Return relative to average drawdown	4.92	-0.22	+5.14

VFSAX vs. OAKEX - Sharpe Ratio Comparison

The current VFSAX Sharpe Ratio is 1.12, which is higher than the OAKEX Sharpe Ratio of -0.09. The chart below compares the historical Sharpe Ratios of VFSAX and OAKEX, 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

VFSAX vs. OAKEX - Drawdown Comparison

The maximum VFSAX drawdown since its inception was -39.86%, smaller than the maximum OAKEX drawdown of -70.12%. Use the drawdown chart below to compare losses from any high point for VFSAX and OAKEX.

Drawdown Indicators

	VFSAX	OAKEX	Difference
Max Drawdown Largest peak-to-trough decline	-39.86%	-70.12%	+30.26%
Max Drawdown (1Y) Largest decline over 1 year	-11.48%	-17.18%	+5.70%
Max Drawdown (3Y) Largest decline over 3 years	-14.73%	-17.18%	+2.45%
Max Drawdown (5Y) Largest decline over 5 years	-33.81%	-38.40%	+4.59%
Max Drawdown (10Y) Largest decline over 10 years	—	-49.61%	—
Current Drawdown Current decline from peak	-5.89%	-6.19%	+0.30%
Average Drawdown Average peak-to-trough decline	-9.17%	-13.47%	+4.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.28%	6.23%	-2.95%

Volatility

VFSAX vs. OAKEX - Volatility Comparison

Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares (VFSAX) has a higher volatility of 5.59% compared to Oakmark International Small Cap Fund (OAKEX) at 4.72%. This indicates that VFSAX's price experiences larger fluctuations and is considered to be riskier than OAKEX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VFSAX	OAKEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.59%	4.72%	+0.87%
Volatility (6M) Calculated over the trailing 6-month period	12.75%	12.21%	+0.54%
Volatility (1Y) Calculated over the trailing 1-year period	14.51%	15.10%	-0.59%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.25%	17.78%	-2.53%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.06%	18.29%	-1.23%

VFSAX vs. OAKEX - Expense Ratio Comparison

VFSAX has a 0.16% expense ratio, which is lower than OAKEX's 1.34% expense ratio.

Dividends

VFSAX vs. OAKEX - Dividend Comparison

VFSAX's dividend yield for the trailing twelve months is around 3.21%, less than OAKEX's 5.30% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OAKEX Oakmark International Small Cap Fund	5.30%	5.24%	6.38%	1.83%	1.89%	0.61%	1.87%	0.21%	8.93%	3.64%	3.09%	5.06%
VFSAX Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares	3.21%	3.31%	3.36%	3.06%	2.22%	2.67%	1.85%	3.19%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both VFSAX and OAKEX in my portfolio?

VFSAX and OAKEX have a correlation of 0.76, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VFSAX or OAKEX?

VFSAX has higher volatility (5.59%) compared to OAKEX (4.72%). In terms of maximum drawdown, VFSAX dropped -39.86% vs OAKEX's -70.12%.

Which has better risk-adjusted returns?

VFSAX currently has the higher Sharpe Ratio (1.12 vs -0.09), 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.