VLISX vs. SSSYX

Last updated Jun 25, 2026

VLISX (Vanguard Large-Cap Index Fund Institutional Shares) and SSSYX (State Street Equity 500 Index Fund Class K) are both mutual funds - VLISX is a Large Cap Blend Equities fund managed by Vanguard, while SSSYX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, VLISX returned 15.62%/yr vs 45.49%/yr for SSSYX. With a 0.99 correlation, they move nearly in lockstep. VLISX charges 0.04%/yr vs 0.02%/yr for SSSYX.

Performance

VLISX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Large-Cap Index Fund Institutional Shares (VLISX) and State Street Equity 500 Index Fund Class K (SSSYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with VLISX having a 7.94% return and SSSYX slightly higher at 8.21%. Over the past 10 years, VLISX has underperformed SSSYX with an annualized return of 15.62%, while SSSYX has yielded a comparatively higher 45.49% annualized return.

VLISX

• 1D: -1.43%
• 1M: -1.22%
• YTD: 7.94%
• 6M: 6.62%
• 1Y: 21.98%
• 3Y*: 21.01%
• 5Y*: 12.66%
• 10Y*: 15.62%

SSSYX

• 1D: -1.43%
• 1M: -1.33%
• YTD: 8.21%
• 6M: 6.88%
• 1Y: 22.31%
• 3Y*: 20.78%
• 5Y*: 13.11%
• 10Y*: 45.49%

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

VLISX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VLISX Vanguard Large-Cap Index Fund Institutional Shares	7.94%	18.11%	25.12%	27.26%	-19.68%	27.04%	21.04%	31.38%	-4.47%	22.04%
SSSYX State Street Equity 500 Index Fund Class K	8.21%	17.81%	24.99%	26.27%	-18.16%	28.51%	1,083.11%	31.38%	-4.38%	21.61%

Correlation

The correlation between VLISX and SSSYX is 1.00 - 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	1.00
Correlation (3Y) Calculated over the trailing 3-year period	1.00
Correlation (5Y) Calculated over the trailing 5-year period	1.00
Correlation (10Y) Calculated over the trailing 10-year period	0.99
Correlation (All Time) Calculated using the full available price history since Sep 18, 2014	0.99

The correlation between VLISX and SSSYX has been stable across timeframes, ranging from 0.99 to 1.00 - a consistent structural relationship.

Return for Risk

VLISX vs. SSSYX — Risk / Return Rank

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

VLISX

VLISX Risk / Return Rank: 50
VLISX Sharpe Ratio Rank: 47
VLISX Sortino Ratio Rank: 44
VLISX Omega Ratio Rank: 46
VLISX Calmar Ratio Rank: 50
VLISX Martin Ratio Rank: 62

SSSYX

SSSYX Risk / Return Rank: 52
SSSYX Sharpe Ratio Rank: 49
SSSYX Sortino Ratio Rank: 45
SSSYX Omega Ratio Rank: 47
SSSYX Calmar Ratio Rank: 54
SSSYX Martin Ratio Rank: 66

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.

VLISX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Large-Cap Index Fund Institutional Shares (VLISX) and State Street Equity 500 Index Fund Class K (SSSYX). 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.

	VLISX	SSSYX	Difference
Sharpe ratio: Return per unit of total volatility	1.86	1.90	-0.04
Sortino ratio: Return per unit of downside risk	2.53	2.58	-0.05
Omega ratio: Gain probability vs. loss probability	1.34	1.34	-0.01
Calmar ratio: Return relative to maximum drawdown	2.55	2.68	-0.12
Martin ratio: Return relative to average drawdown	11.31	12.02	-0.72

VLISX vs. SSSYX - Sharpe Ratio Comparison

The current VLISX Sharpe Ratio is 1.86, which is comparable to the SSSYX Sharpe Ratio of 1.90. The chart below compares the historical Sharpe Ratios of VLISX and SSSYX, 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

VLISX vs. SSSYX - Drawdown Comparison

The maximum VLISX drawdown since its inception was -54.48%, which is greater than SSSYX's maximum drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for VLISX and SSSYX.

Drawdown Indicators

	VLISX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-54.48%	-33.77%	-20.71%
Max Drawdown (1Y) Largest decline over 1 year	-9.19%	-8.88%	-0.31%
Max Drawdown (3Y) Largest decline over 3 years	-19.01%	-18.74%	-0.27%
Max Drawdown (5Y) Largest decline over 5 years	-25.65%	-24.49%	-1.16%
Max Drawdown (10Y) Largest decline over 10 years	-33.97%	-33.77%	-0.20%
Current Drawdown Current decline from peak	-3.19%	-3.12%	-0.07%
Average Drawdown Average peak-to-trough decline	-6.72%	-3.91%	-2.81%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.07%	1.97%	+0.10%

Volatility

VLISX vs. SSSYX - Volatility Comparison

Vanguard Large-Cap Index Fund Institutional Shares (VLISX) and State Street Equity 500 Index Fund Class K (SSSYX) have volatilities of 5.01% and 4.89%, 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

	VLISX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.01%	4.89%	+0.12%
Volatility (6M) Calculated over the trailing 6-month period	10.01%	9.92%	+0.09%
Volatility (1Y) Calculated over the trailing 1-year period	12.66%	12.56%	+0.10%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.27%	16.99%	+0.28%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.22%	121.18%	-102.96%

VLISX vs. SSSYX - Expense Ratio Comparison

VLISX has a 0.04% expense ratio, which is higher than SSSYX's 0.02% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

VLISX vs. SSSYX - Dividend Comparison

VLISX's dividend yield for the trailing twelve months is around 1.00%, less than SSSYX's 1.33% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SSSYX State Street Equity 500 Index Fund Class K	1.33%	1.44%	1.63%	1.78%	2.16%	2.76%	1.86%	4.44%	5.18%	5.94%	2.07%	1.84%
VLISX Vanguard Large-Cap Index Fund Institutional Shares	1.00%	1.08%	1.24%	1.41%	1.67%	1.19%	1.46%	1.81%	2.09%	1.76%	1.99%	1.97%

Frequently Asked Questions

Can I hold both VLISX and SSSYX in my portfolio?

With a correlation of 1.00, VLISX and SSSYX 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, VLISX or SSSYX?

VLISX has higher volatility (5.01%) compared to SSSYX (4.89%). In terms of maximum drawdown, VLISX dropped -54.48% vs SSSYX's -33.77%.

Which has better risk-adjusted returns?

SSSYX currently has the higher Sharpe Ratio (1.90 vs 1.86), 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.