WPOPX vs. VMNFX

Last updated Jun 4, 2026

WPOPX (Weitz Partners III Opportunity Fund) and VMNFX (Vanguard Market Neutral Fund Investor Shares) are both Long-Short funds. Over the past 10 years, WPOPX returned 6.03%/yr vs 5.00%/yr for VMNFX. At a correlation of -0.01, they often move in opposite directions. WPOPX charges 1.43%/yr vs 1.31%/yr for VMNFX.

Performance

WPOPX vs. VMNFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Weitz Partners III Opportunity Fund (WPOPX) and Vanguard Market Neutral Fund Investor Shares (VMNFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, WPOPX achieves a -3.01% return, which is significantly lower than VMNFX's 12.03% return. Over the past 10 years, WPOPX has outperformed VMNFX with an annualized return of 6.03%, while VMNFX has yielded a comparatively lower 5.00% annualized return.

WPOPX

• 1D: -1.26%
• 1M: -0.48%
• YTD: -3.01%
• 6M: -2.96%
• 1Y: 0.27%
• 3Y*: 8.46%
• 5Y*: 1.45%
• 10Y*: 6.03%

VMNFX

• 1D: 0.38%
• 1M: 0.77%
• YTD: 12.03%
• 6M: 13.70%
• 1Y: 18.01%
• 3Y*: 13.20%
• 5Y*: 12.93%
• 10Y*: 5.00%

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

WPOPX vs. VMNFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
WPOPX Weitz Partners III Opportunity Fund	-3.01%	3.23%	16.32%	17.35%	-22.53%	12.55%	9.45%	34.24%	-5.26%	5.48%
VMNFX Vanguard Market Neutral Fund Investor Shares	12.03%	9.27%	5.78%	12.23%	13.48%	23.24%	-11.58%	-9.57%	0.60%	-4.89%

Correlation

The correlation between WPOPX and VMNFX is -0.17, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.17
Correlation (3Y) Calculated over the trailing 3-year period	-0.08
Correlation (5Y) Calculated over the trailing 5-year period	-0.07
Correlation (10Y) Calculated over the trailing 10-year period	-0.01
Correlation (All Time) Calculated using the full available price history since Jan 3, 2006	-0.01

The correlation between WPOPX and VMNFX shifts across timeframes, from -0.17 (1 year) to -0.01 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

WPOPX vs. VMNFX — Risk / Return Rank

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

WPOPX

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

VMNFX

VMNFX Risk / Return Rank: 62
VMNFX Sharpe Ratio Rank: 58
VMNFX Sortino Ratio Rank: 66
VMNFX Omega Ratio Rank: 54
VMNFX Calmar Ratio Rank: 82
VMNFX Martin Ratio Rank: 51

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.

WPOPX vs. VMNFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Weitz Partners III Opportunity Fund (WPOPX) and Vanguard Market Neutral Fund Investor Shares (VMNFX). 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.

	WPOPX	VMNFX	Difference
Sharpe ratio: Return per unit of total volatility	0.04	2.25	-2.21
Sortino ratio: Return per unit of downside risk	0.13	3.39	-3.25
Omega ratio: Gain probability vs. loss probability	1.02	1.41	-0.39
Calmar ratio: Return relative to maximum drawdown	0.03	3.76	-3.72
Martin ratio: Return relative to average drawdown	0.10	10.39	-10.29
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WPOPX vs. VMNFX - Sharpe Ratio Comparison

The current WPOPX Sharpe Ratio is 0.04, which is lower than the VMNFX Sharpe Ratio of 2.25. The chart below compares the historical Sharpe Ratios of WPOPX and VMNFX, 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

	WPOPX	VMNFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.04	2.25	-2.21
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.09	1.80	-1.71
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.38	0.79	-0.41
Sharpe Ratio (All Time) Calculated using the full available price history	0.40	0.34	+0.07

Drawdowns

WPOPX vs. VMNFX - Drawdown Comparison

The maximum WPOPX drawdown since its inception was -55.70%, which is greater than VMNFX's maximum drawdown of -26.42%. Use the drawdown chart below to compare losses from any high point for WPOPX and VMNFX.

Drawdown Indicators

	WPOPX	VMNFX	Difference
Max Drawdown Largest peak-to-trough decline	-55.70%	-26.42%	-29.28%
Max Drawdown (1Y) Largest decline over 1 year	-12.44%	-4.65%	-7.79%
Max Drawdown (3Y) Largest decline over 3 years	-14.79%	-5.44%	-9.35%
Max Drawdown (5Y) Largest decline over 5 years	-28.73%	-6.75%	-21.98%
Max Drawdown (10Y) Largest decline over 10 years	-28.73%	-25.09%	-3.64%
Current Drawdown Current decline from peak	-5.28%	0.00%	-5.28%
Average Drawdown Average peak-to-trough decline	-8.35%	-8.76%	+0.41%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.15%	1.75%	+2.40%

Volatility

WPOPX vs. VMNFX - Volatility Comparison

Weitz Partners III Opportunity Fund (WPOPX) has a higher volatility of 2.90% compared to Vanguard Market Neutral Fund Investor Shares (VMNFX) at 1.99%. This indicates that WPOPX's price experiences larger fluctuations and is considered to be riskier than VMNFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	WPOPX	VMNFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.90%	1.99%	+0.91%
Volatility (6M) Calculated over the trailing 6-month period	8.90%	5.78%	+3.12%
Volatility (1Y) Calculated over the trailing 1-year period	12.14%	7.82%	+4.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.88%	7.21%	+8.67%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	15.97%	6.39%	+9.58%

WPOPX vs. VMNFX - Expense Ratio Comparison

WPOPX has a 1.43% expense ratio, which is higher than VMNFX's 1.31% expense ratio.

Dividends

WPOPX vs. VMNFX - Dividend Comparison

WPOPX's dividend yield for the trailing twelve months is around 5.80%, more than VMNFX's 3.13% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VMNFX Vanguard Market Neutral Fund Investor Shares	3.13%	3.53%	5.61%	5.09%	0.75%	0.16%	0.81%	3.16%	0.94%	1.07%	0.38%	0.02%
WPOPX Weitz Partners III Opportunity Fund	5.80%	5.62%	7.04%	6.85%	8.47%	11.86%	12.50%	6.51%	7.99%	4.65%	1.35%	13.50%

Frequently Asked Questions

Can I hold both WPOPX and VMNFX in my portfolio?

WPOPX and VMNFX have a correlation of -0.17, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, WPOPX or VMNFX?

WPOPX has higher volatility (2.90%) compared to VMNFX (1.99%). In terms of maximum drawdown, WPOPX dropped -55.70% vs VMNFX's -26.42%.

Which has better risk-adjusted returns?

VMNFX currently has the higher Sharpe Ratio (2.25 vs 0.04), 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.