BIGTX vs. VEMPX

Last updated Jun 5, 2026

BIGTX (The Texas Fund) and VEMPX (Vanguard Extended Market Index Fund Institutional Plus Shares) are both Mid Cap Blend Equities funds. Over the past 10 years, BIGTX returned 10.70%/yr vs 12.10%/yr for VEMPX. Their correlation of 0.87 suggests significant overlap in exposure. BIGTX charges 1.67%/yr vs 0.04%/yr for VEMPX.

Performance

BIGTX vs. VEMPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in The Texas Fund (BIGTX) and Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BIGTX achieves a 25.46% return, which is significantly higher than VEMPX's 13.78% return. Over the past 10 years, BIGTX has underperformed VEMPX with an annualized return of 10.70%, while VEMPX has yielded a comparatively higher 12.10% annualized return.

BIGTX

• 1D: -0.75%
• 1M: 5.16%
• YTD: 25.46%
• 6M: 21.80%
• 1Y: 35.96%
• 3Y*: 20.66%
• 5Y*: 9.10%
• 10Y*: 10.70%

VEMPX

• 1D: -1.01%
• 1M: 3.43%
• YTD: 13.78%
• 6M: 11.95%
• 1Y: 28.76%
• 3Y*: 19.76%
• 5Y*: 6.56%
• 10Y*: 12.10%

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

BIGTX vs. VEMPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BIGTX The Texas Fund	25.46%	5.98%	15.76%	11.32%	-6.93%	23.90%	13.11%	9.61%	-11.44%	11.58%
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	13.78%	11.43%	15.50%	26.98%	-26.45%	12.48%	32.24%	28.06%	-9.35%	18.13%

Correlation

The correlation between BIGTX and VEMPX is 0.82, 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	0.82
Correlation (3Y) Calculated over the trailing 3-year period	0.88
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (10Y) Calculated over the trailing 10-year period	0.86
Correlation (All Time) Calculated using the full available price history since Jan 3, 2014	0.87

The correlation between BIGTX and VEMPX has been stable across timeframes, ranging from 0.82 to 0.88 - a consistent structural relationship.

Return for Risk

BIGTX vs. VEMPX — Risk / Return Rank

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

BIGTX

BIGTX Risk / Return Rank: 76
BIGTX Sharpe Ratio Rank: 77
BIGTX Sortino Ratio Rank: 69
BIGTX Omega Ratio Rank: 60
BIGTX Calmar Ratio Rank: 88
BIGTX Martin Ratio Rank: 86

VEMPX

VEMPX Risk / Return Rank: 40
VEMPX Sharpe Ratio Rank: 34
VEMPX Sortino Ratio Rank: 32
VEMPX Omega Ratio Rank: 30
VEMPX Calmar Ratio Rank: 55
VEMPX Martin Ratio Rank: 49

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.

BIGTX vs. VEMPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for The Texas Fund (BIGTX) and Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX). 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.

	BIGTX	VEMPX	Difference
Sharpe ratio: Return per unit of total volatility	2.55	1.69	+0.86
Sortino ratio: Return per unit of downside risk	3.45	2.38	+1.07
Omega ratio: Gain probability vs. loss probability	1.43	1.29	+0.14
Calmar ratio: Return relative to maximum drawdown	4.37	2.83	+1.54
Martin ratio: Return relative to average drawdown	16.00	9.99	+6.00
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BIGTX vs. VEMPX - Sharpe Ratio Comparison

The current BIGTX Sharpe Ratio is 2.55, which is higher than the VEMPX Sharpe Ratio of 1.69. The chart below compares the historical Sharpe Ratios of BIGTX and VEMPX, 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

	BIGTX	VEMPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.55	1.69	+0.86
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.07	0.30	-0.22
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.12	0.54	-0.42
Sharpe Ratio (All Time) Calculated using the full available price history	0.09	0.54	-0.46

Drawdowns

BIGTX vs. VEMPX - Drawdown Comparison

The maximum BIGTX drawdown since its inception was -77.89%, which is greater than VEMPX's maximum drawdown of -41.62%. Use the drawdown chart below to compare losses from any high point for BIGTX and VEMPX.

Drawdown Indicators

	BIGTX	VEMPX	Difference
Max Drawdown Largest peak-to-trough decline	-77.89%	-41.62%	-36.27%
Max Drawdown (1Y) Largest decline over 1 year	-8.07%	-10.25%	+2.18%
Max Drawdown (3Y) Largest decline over 3 years	-77.89%	-26.83%	-51.06%
Max Drawdown (5Y) Largest decline over 5 years	-77.89%	-36.32%	-41.57%
Max Drawdown (10Y) Largest decline over 10 years	-77.89%	-41.62%	-36.27%
Current Drawdown Current decline from peak	-65.13%	-1.01%	-64.12%
Average Drawdown Average peak-to-trough decline	-17.17%	-7.97%	-9.20%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.20%	2.89%	-0.69%

Volatility

BIGTX vs. VEMPX - Volatility Comparison

The current volatility for The Texas Fund (BIGTX) is 4.18%, while Vanguard Extended Market Index Fund Institutional Plus Shares (VEMPX) has a volatility of 4.83%. This indicates that BIGTX experiences smaller price fluctuations and is considered to be less risky than VEMPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BIGTX	VEMPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.18%	4.83%	-0.65%
Volatility (6M) Calculated over the trailing 6-month period	10.19%	12.48%	-2.29%
Volatility (1Y) Calculated over the trailing 1-year period	13.90%	17.21%	-3.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	126.63%	22.34%	+104.29%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	90.62%	22.36%	+68.26%

BIGTX vs. VEMPX - Expense Ratio Comparison

BIGTX has a 1.67% expense ratio, which is higher than VEMPX's 0.04% expense ratio.

Dividends

BIGTX vs. VEMPX - Dividend Comparison

BIGTX's dividend yield for the trailing twelve months is around 5.88%, more than VEMPX's 1.03% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BIGTX The Texas Fund	5.88%	7.38%	3.52%	2.51%	3.06%	5.27%	0.07%	0.08%	2.27%	0.00%	0.00%	0.00%
VEMPX Vanguard Extended Market Index Fund Institutional Plus Shares	1.03%	1.15%	1.11%	1.27%	1.17%	1.15%	1.09%	1.32%	1.68%	1.27%	1.46%	1.39%

Frequently Asked Questions

Can I hold both BIGTX and VEMPX in my portfolio?

BIGTX and VEMPX have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BIGTX or VEMPX?

VEMPX has higher volatility (4.83%) compared to BIGTX (4.18%). In terms of maximum drawdown, BIGTX dropped -77.89% vs VEMPX's -41.62%.

Which has better risk-adjusted returns?

BIGTX currently has the higher Sharpe Ratio (2.55 vs 1.69), 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.