ADGAX vs. VIIIX

Last updated Jun 5, 2026

ADGAX (AB Core Opportunities Fund) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - ADGAX is a Large Cap Blend Equities fund managed by AllianceBernstein, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, ADGAX returned 13.32%/yr vs 15.65%/yr for VIIIX. Their correlation of 0.93 suggests significant overlap in exposure. ADGAX charges 1.09%/yr vs 0.02%/yr for VIIIX.

Performance

ADGAX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AB Core Opportunities Fund (ADGAX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ADGAX achieves a 5.48% return, which is significantly lower than VIIIX's 10.88% return. Over the past 10 years, ADGAX has underperformed VIIIX with an annualized return of 13.32%, while VIIIX has yielded a comparatively higher 15.65% annualized return.

ADGAX

• 1D: -0.77%
• 1M: 2.16%
• YTD: 5.48%
• 6M: 4.95%
• 1Y: 20.39%
• 3Y*: 19.53%
• 5Y*: 10.99%
• 10Y*: 13.32%

VIIIX

• 1D: -0.74%
• 1M: 4.17%
• YTD: 10.88%
• 6M: 10.80%
• 1Y: 28.02%
• 3Y*: 22.87%
• 5Y*: 14.05%
• 10Y*: 15.65%

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

ADGAX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ADGAX AB Core Opportunities Fund	5.48%	17.36%	22.49%	20.93%	-15.73%	24.34%	12.97%	26.94%	-2.89%	22.46%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	10.88%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	31.48%	-4.41%	21.82%

Correlation

The correlation between ADGAX and VIIIX is 0.96 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.96
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.96
Correlation (All Time) Calculated using the full available price history since Dec 23, 1999	0.93

The correlation between ADGAX and VIIIX has been stable across timeframes, ranging from 0.93 to 0.97 - a consistent structural relationship.

Return for Risk

ADGAX vs. VIIIX — Risk / Return Rank

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

ADGAX

ADGAX Risk / Return Rank: 32
ADGAX Sharpe Ratio Rank: 36
ADGAX Sortino Ratio Rank: 34
ADGAX Omega Ratio Rank: 36
ADGAX Calmar Ratio Rank: 25
ADGAX Martin Ratio Rank: 31

VIIIX

VIIIX Risk / Return Rank: 66
VIIIX Sharpe Ratio Rank: 64
VIIIX Sortino Ratio Rank: 59
VIIIX Omega Ratio Rank: 59
VIIIX Calmar Ratio Rank: 67
VIIIX Martin Ratio Rank: 79

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.

ADGAX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AB Core Opportunities Fund (ADGAX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.

	ADGAX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.70	2.37	-0.67
Sortino ratio: Return per unit of downside risk	2.36	3.24	-0.88
Omega ratio: Gain probability vs. loss probability	1.31	1.43	-0.12
Calmar ratio: Return relative to maximum drawdown	1.79	3.17	-1.38
Martin ratio: Return relative to average drawdown	6.98	14.79	-7.81
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ADGAX vs. VIIIX - Sharpe Ratio Comparison

The current ADGAX Sharpe Ratio is 1.70, which is comparable to the VIIIX Sharpe Ratio of 2.37. The chart below compares the historical Sharpe Ratios of ADGAX and VIIIX, 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

	ADGAX	VIIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.70	2.37	-0.67
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.84	-0.23
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.76	0.87	-0.11
Sharpe Ratio (All Time) Calculated using the full available price history	0.51	0.49	+0.02

Drawdowns

ADGAX vs. VIIIX - Drawdown Comparison

The maximum ADGAX drawdown since its inception was -53.65%, roughly equal to the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for ADGAX and VIIIX.

Drawdown Indicators

	ADGAX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-53.65%	-55.18%	+1.53%
Max Drawdown (1Y) Largest decline over 1 year	-11.76%	-8.90%	-2.86%
Max Drawdown (3Y) Largest decline over 3 years	-18.08%	-18.75%	+0.67%
Max Drawdown (5Y) Largest decline over 5 years	-24.23%	-24.50%	+0.27%
Max Drawdown (10Y) Largest decline over 10 years	-31.10%	-33.79%	+2.69%
Current Drawdown Current decline from peak	-0.77%	-0.74%	-0.03%
Average Drawdown Average peak-to-trough decline	-7.80%	-10.02%	+2.22%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.00%	1.90%	+1.10%

Volatility

ADGAX vs. VIIIX - Volatility Comparison

AB Core Opportunities Fund (ADGAX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) have volatilities of 2.92% and 2.93%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ADGAX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.92%	2.93%	-0.01%
Volatility (6M) Calculated over the trailing 6-month period	9.58%	8.99%	+0.59%
Volatility (1Y) Calculated over the trailing 1-year period	12.35%	11.88%	+0.47%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.14%	16.89%	+1.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.69%	18.06%	-0.37%

ADGAX vs. VIIIX - Expense Ratio Comparison

ADGAX has a 1.09% expense ratio, which is higher than VIIIX's 0.02% expense ratio.

Dividends

ADGAX vs. VIIIX - Dividend Comparison

ADGAX's dividend yield for the trailing twelve months is around 14.84%, more than VIIIX's 2.43% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ADGAX AB Core Opportunities Fund	14.84%	15.65%	10.29%	4.69%	10.73%	15.80%	4.24%	5.63%	17.66%	11.05%	4.72%	7.20%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.43%	2.11%	3.66%	2.66%	3.39%	4.79%	3.07%	2.86%	2.45%	1.84%	2.38%	2.47%

Frequently Asked Questions

Can I hold both ADGAX and VIIIX in my portfolio?

With a correlation of 0.96, ADGAX and VIIIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, ADGAX or VIIIX?

VIIIX has higher volatility (2.93%) compared to ADGAX (2.92%). In terms of maximum drawdown, ADGAX dropped -53.65% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

VIIIX currently has the higher Sharpe Ratio (2.37 vs 1.70), 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.