VPKIX vs. OBCHX

Last updated Jul 14, 2026

VPKIX (Vanguard Pacific Stock Index Fund Institutional Shares) and OBCHX (Oberweis China Opportunities Fund) are both mutual funds - VPKIX is a Asia Pacific Equities fund managed by Vanguard, while OBCHX is a China Equities fund managed by Oberweis. Over the past 10 years, VPKIX returned 10.14%/yr vs 10.36%/yr for OBCHX. A 0.59 correlation means they provide meaningful diversification when combined. VPKIX charges 0.08%/yr vs 2.03%/yr for OBCHX.

Performance

VPKIX vs. OBCHX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Pacific Stock Index Fund Institutional Shares (VPKIX) and Oberweis China Opportunities Fund (OBCHX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VPKIX achieves a 25.60% return, which is significantly lower than OBCHX's 30.70% return. Both investments have delivered pretty close results over the past 10 years, with VPKIX having a 10.14% annualized return and OBCHX not far ahead at 10.36%.

VPKIX

• 1D: 0.61%
• 1M: -0.65%
• 6M: 19.34%
• YTD: 25.60%
• 1Y: 45.05%
• 3Y*: 21.53%
• 5Y*: 10.00%
• 10Y*: 10.14%

OBCHX

• 1D: -1.88%
• 1M: 1.62%
• 6M: 20.65%
• YTD: 30.70%
• 1Y: 51.76%
• 3Y*: 25.04%
• 5Y*: 1.07%
• 10Y*: 10.36%

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

VPKIX vs. OBCHX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VPKIX Vanguard Pacific Stock Index Fund Institutional Shares	25.60%	33.12%	1.29%	15.58%	-15.20%	1.47%	16.54%	17.61%	-13.87%	28.55%
OBCHX Oberweis China Opportunities Fund	30.70%	40.89%	7.28%	-7.70%	-37.21%	-5.16%	57.06%	36.32%	-25.94%	54.99%

Correlation

The correlation between VPKIX and OBCHX is 0.48, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.48
Correlation (3Y) Calculated over the trailing 3-year period	0.50
Correlation (5Y) Calculated over the trailing 5-year period	0.49
Correlation (10Y) Calculated over the trailing 10-year period	0.53
Correlation (All Time) Calculated using the full available price history since Oct 4, 2005	0.59

The correlation between VPKIX and OBCHX shifts across timeframes, from 0.48 (1 year) to 0.59 (all time), reflecting how their relationship changes across market environments.

Return for Risk

VPKIX vs. OBCHX — Risk / Return Rank

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

VPKIX

VPKIX Risk / Return Rank: 78
VPKIX Sharpe Ratio Rank: 78
VPKIX Sortino Ratio Rank: 67
VPKIX Omega Ratio Rank: 77
VPKIX Calmar Ratio Rank: 86
VPKIX Martin Ratio Rank: 83

OBCHX

OBCHX Risk / Return Rank: 84
OBCHX Sharpe Ratio Rank: 84
OBCHX Sortino Ratio Rank: 74
OBCHX Omega Ratio Rank: 76
OBCHX Calmar Ratio Rank: 97
OBCHX Martin Ratio Rank: 89

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.

VPKIX vs. OBCHX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Pacific Stock Index Fund Institutional Shares (VPKIX) and Oberweis China Opportunities Fund (OBCHX). 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.

	VPKIX	OBCHX	Difference
Sharpe ratio: Return per unit of total volatility	2.02	2.19	-0.17
Sortino ratio: Return per unit of downside risk	2.57	2.76	-0.18
Omega ratio: Gain probability vs. loss probability	1.38	1.37	+0.01
Calmar ratio: Return relative to maximum drawdown	3.31	5.46	-2.15
Martin ratio: Return relative to average drawdown	11.72	13.27	-1.56

VPKIX vs. OBCHX - Sharpe Ratio Comparison

The current VPKIX Sharpe Ratio is 2.02, which is comparable to the OBCHX Sharpe Ratio of 2.19. The chart below compares the historical Sharpe Ratios of VPKIX and OBCHX, 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

VPKIX vs. OBCHX - Drawdown Comparison

The maximum VPKIX drawdown since its inception was -55.26%, smaller than the maximum OBCHX drawdown of -74.03%. Use the drawdown chart below to compare losses from any high point for VPKIX and OBCHX.

Drawdown Indicators

	VPKIX	OBCHX	Difference
Max Drawdown Largest peak-to-trough decline	-55.26%	-74.03%	+18.77%
Max Drawdown (1Y) Largest decline over 1 year	-13.40%	-9.59%	-3.81%
Max Drawdown (3Y) Largest decline over 3 years	-16.38%	-23.88%	+7.50%
Max Drawdown (5Y) Largest decline over 5 years	-31.12%	-51.78%	+20.66%
Max Drawdown (10Y) Largest decline over 10 years	-33.62%	-59.47%	+25.85%
Current Drawdown Current decline from peak	-5.36%	-12.88%	+7.52%
Average Drawdown Average peak-to-trough decline	-15.39%	-25.64%	+10.25%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.78%	3.94%	-0.16%

Volatility

VPKIX vs. OBCHX - Volatility Comparison

Vanguard Pacific Stock Index Fund Institutional Shares (VPKIX) has a higher volatility of 11.16% compared to Oberweis China Opportunities Fund (OBCHX) at 9.24%. This indicates that VPKIX's price experiences larger fluctuations and is considered to be riskier than OBCHX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VPKIX	OBCHX	Difference
Volatility (1M) Calculated over the trailing 1-month period	11.16%	9.24%	+1.92%
Volatility (6M) Calculated over the trailing 6-month period	19.50%	18.46%	+1.04%
Volatility (1Y) Calculated over the trailing 1-year period	21.94%	23.88%	-1.94%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.30%	27.04%	-9.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.59%	25.30%	-8.71%

VPKIX vs. OBCHX - Expense Ratio Comparison

VPKIX has a 0.08% expense ratio, which is lower than OBCHX's 2.03% expense ratio.

Dividends

VPKIX vs. OBCHX - Dividend Comparison

VPKIX's dividend yield for the trailing twelve months is around 2.66%, more than OBCHX's 0.77% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OBCHX Oberweis China Opportunities Fund	0.77%	1.01%	2.16%	0.46%	1.22%	41.65%	11.50%	3.37%	26.11%	6.26%	0.81%	11.05%
VPKIX Vanguard Pacific Stock Index Fund Institutional Shares	2.66%	4.00%	3.15%	3.11%	2.74%	3.17%	1.81%	2.85%	3.05%	2.60%	2.67%	2.45%

Frequently Asked Questions

Can I hold both VPKIX and OBCHX in my portfolio?

VPKIX and OBCHX have a correlation of 0.48, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VPKIX or OBCHX?

VPKIX has higher volatility (11.16%) compared to OBCHX (9.24%). In terms of maximum drawdown, VPKIX dropped -55.26% vs OBCHX's -74.03%.

Which has better risk-adjusted returns?

OBCHX currently has the higher Sharpe Ratio (2.19 vs 2.02), 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.