VUIAX vs. GASFX

Last updated Jun 4, 2026

VUIAX (Vanguard Utilities Index Fund Admiral Shares) and GASFX (Hennessy Gas Utility Fund) are both Utilities Equities funds. Over the past 10 years, VUIAX returned 9.05%/yr vs 9.17%/yr for GASFX. Their correlation of 0.88 suggests significant overlap in exposure. VUIAX charges 0.10%/yr vs 1.00%/yr for GASFX.

Performance

VUIAX vs. GASFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Utilities Index Fund Admiral Shares (VUIAX) and Hennessy Gas Utility Fund (GASFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VUIAX achieves a 3.85% return, which is significantly lower than GASFX's 9.02% return. Both investments have delivered pretty close results over the past 10 years, with VUIAX having a 9.05% annualized return and GASFX not far ahead at 9.17%.

VUIAX

• 1D: 1.99%
• 1M: -4.84%
• YTD: 3.85%
• 6M: 1.87%
• 1Y: 10.24%
• 3Y*: 13.81%
• 5Y*: 9.16%
• 10Y*: 9.05%

GASFX

• 1D: 1.66%
• 1M: -4.14%
• YTD: 9.02%
• 6M: 7.50%
• 1Y: 11.12%
• 3Y*: 15.68%
• 5Y*: 12.33%
• 10Y*: 9.17%

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

VUIAX vs. GASFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VUIAX Vanguard Utilities Index Fund Admiral Shares	3.85%	16.39%	23.03%	-7.49%	1.13%	17.16%	-0.90%	24.97%	4.45%	12.49%
GASFX Hennessy Gas Utility Fund	9.02%	10.42%	24.98%	0.27%	13.68%	19.60%	-9.34%	20.80%	-3.47%	7.04%

Correlation

The correlation between VUIAX and GASFX is 0.70, 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	0.70
Correlation (3Y) Calculated over the trailing 3-year period	0.82
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (10Y) Calculated over the trailing 10-year period	0.87
Correlation (All Time) Calculated using the full available price history since Feb 3, 2004	0.88

The correlation between VUIAX and GASFX shifts across timeframes, from 0.70 (1 year) to 0.88 (all time), reflecting how their relationship changes across market environments.

Return for Risk

VUIAX vs. GASFX — Risk / Return Rank

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

VUIAX

VUIAX Risk / Return Rank: 9
VUIAX Sharpe Ratio Rank: 9
VUIAX Sortino Ratio Rank: 8
VUIAX Omega Ratio Rank: 9
VUIAX Calmar Ratio Rank: 13
VUIAX Martin Ratio Rank: 9

GASFX

GASFX Risk / Return Rank: 14
GASFX Sharpe Ratio Rank: 12
GASFX Sortino Ratio Rank: 12
GASFX Omega Ratio Rank: 11
GASFX Calmar Ratio Rank: 19
GASFX Martin Ratio Rank: 18

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.

VUIAX vs. GASFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Utilities Index Fund Admiral Shares (VUIAX) and Hennessy Gas Utility Fund (GASFX). 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.

	VUIAX	GASFX	Difference
Sharpe ratio: Return per unit of total volatility	0.73	0.94	-0.21
Sortino ratio: Return per unit of downside risk	1.07	1.38	-0.31
Omega ratio: Gain probability vs. loss probability	1.13	1.16	-0.03
Calmar ratio: Return relative to maximum drawdown	1.19	1.60	-0.41
Martin ratio: Return relative to average drawdown	2.68	4.93	-2.25
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VUIAX vs. GASFX - Sharpe Ratio Comparison

The current VUIAX Sharpe Ratio is 0.73, which is comparable to the GASFX Sharpe Ratio of 0.94. The chart below compares the historical Sharpe Ratios of VUIAX and GASFX, 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

	VUIAX	GASFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.73	0.94	-0.21
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.54	0.80	-0.26
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.47	0.52	-0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.53	0.57	-0.04

Drawdowns

VUIAX vs. GASFX - Drawdown Comparison

The maximum VUIAX drawdown since its inception was -46.29%, smaller than the maximum GASFX drawdown of -49.33%. Use the drawdown chart below to compare losses from any high point for VUIAX and GASFX.

Drawdown Indicators

	VUIAX	GASFX	Difference
Max Drawdown Largest peak-to-trough decline	-46.29%	-49.33%	+3.04%
Max Drawdown (1Y) Largest decline over 1 year	-8.87%	-6.95%	-1.92%
Max Drawdown (3Y) Largest decline over 3 years	-17.42%	-12.43%	-4.99%
Max Drawdown (5Y) Largest decline over 5 years	-25.18%	-18.25%	-6.93%
Max Drawdown (10Y) Largest decline over 10 years	-36.21%	-37.23%	+1.02%
Current Drawdown Current decline from peak	-6.69%	-5.41%	-1.28%
Average Drawdown Average peak-to-trough decline	-7.77%	-7.86%	+0.09%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.92%	2.26%	+1.66%

Volatility

VUIAX vs. GASFX - Volatility Comparison

Vanguard Utilities Index Fund Admiral Shares (VUIAX) has a higher volatility of 5.42% compared to Hennessy Gas Utility Fund (GASFX) at 4.71%. This indicates that VUIAX's price experiences larger fluctuations and is considered to be riskier than GASFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VUIAX	GASFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.42%	4.71%	+0.71%
Volatility (6M) Calculated over the trailing 6-month period	11.64%	9.18%	+2.46%
Volatility (1Y) Calculated over the trailing 1-year period	14.38%	11.83%	+2.55%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.11%	15.47%	+1.64%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.18%	17.68%	+1.50%

VUIAX vs. GASFX - Expense Ratio Comparison

VUIAX has a 0.10% expense ratio, which is lower than GASFX's 1.00% expense ratio.

Dividends

VUIAX vs. GASFX - Dividend Comparison

VUIAX's dividend yield for the trailing twelve months is around 2.67%, less than GASFX's 11.13% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
GASFX Hennessy Gas Utility Fund	11.13%	12.06%	7.36%	6.63%	15.49%	10.63%	10.93%	7.11%	12.31%	2.96%	3.52%	5.64%
VUIAX Vanguard Utilities Index Fund Admiral Shares	2.67%	2.73%	3.01%	3.49%	2.98%	2.56%	3.17%	2.82%	3.23%	3.18%	3.19%	3.64%

Frequently Asked Questions

Can I hold both VUIAX and GASFX in my portfolio?

VUIAX and GASFX have a correlation of 0.70, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VUIAX or GASFX?

VUIAX has higher volatility (5.42%) compared to GASFX (4.71%). In terms of maximum drawdown, VUIAX dropped -46.29% vs GASFX's -49.33%.

Which has better risk-adjusted returns?

GASFX currently has the higher Sharpe Ratio (0.94 vs 0.73), 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.