BASMX vs. SSSYX

Last updated Jun 4, 2026

BASMX (iShares Total U.S. Stock Market Index Fund Investor A Shares) and SSSYX (State Street Equity 500 Index Fund Class K) are both Large Cap Blend Equities funds - BASMX tracks the Russell 3000 Index while SSSYX tracks the S&P 500 Index. Both are passively managed. Over the past 10 years, BASMX returned 14.79%/yr vs 15.61%/yr for SSSYX. With a 0.98 correlation, they move nearly in lockstep. BASMX charges 0.33%/yr vs 0.02%/yr for SSSYX.

Performance

BASMX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) 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 BASMX having a 11.60% return and SSSYX slightly higher at 11.69%. Over the past 10 years, BASMX has underperformed SSSYX with an annualized return of 14.79%, while SSSYX has yielded a comparatively higher 15.61% annualized return.

BASMX

• 1D: 0.23%
• 1M: 5.66%
• YTD: 11.60%
• 6M: 11.46%
• 1Y: 28.31%
• 3Y*: 21.93%
• 5Y*: 12.79%
• 10Y*: 14.79%

SSSYX

• 1D: 0.14%
• 1M: 5.79%
• YTD: 11.69%
• 6M: 11.73%
• 1Y: 28.94%
• 3Y*: 22.73%
• 5Y*: 14.24%
• 10Y*: 15.61%

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

BASMX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BASMX iShares Total U.S. Stock Market Index Fund Investor A Shares	11.60%	16.81%	23.46%	25.63%	-19.32%	25.26%	20.37%	30.71%	-5.57%	20.65%
SSSYX State Street Equity 500 Index Fund Class K	11.69%	17.81%	24.99%	26.27%	-18.16%	28.51%	18.31%	31.38%	-4.38%	21.61%

Correlation

The correlation between BASMX and SSSYX is 0.99 - 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	0.99
Correlation (3Y) Calculated over the trailing 3-year period	0.99
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (10Y) Calculated over the trailing 10-year period	0.98
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.98

The correlation between BASMX and SSSYX has been stable across timeframes, ranging from 0.98 to 0.99 - a consistent structural relationship.

Return for Risk

BASMX vs. SSSYX — Risk / Return Rank

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

BASMX

BASMX Risk / Return Rank: 68
BASMX Sharpe Ratio Rank: 68
BASMX Sortino Ratio Rank: 62
BASMX Omega Ratio Rank: 61
BASMX Calmar Ratio Rank: 71
BASMX Martin Ratio Rank: 80

SSSYX

SSSYX Risk / Return Rank: 73
SSSYX Sharpe Ratio Rank: 75
SSSYX Sortino Ratio Rank: 67
SSSYX Omega Ratio Rank: 67
SSSYX Calmar Ratio Rank: 74
SSSYX Martin Ratio Rank: 83

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.

BASMX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) 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.

	BASMX	SSSYX	Difference
Sharpe ratio Return per unit of total volatility	2.41	2.52	-0.10
Sortino ratio Return per unit of downside risk	3.30	3.42	-0.12
Omega ratio Gain probability vs. loss probability	1.43	1.46	-0.02
Calmar ratio Return relative to maximum drawdown	3.29	3.36	-0.07
Martin ratio Return relative to average drawdown	15.07	15.69	-0.62
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BASMX vs. SSSYX - Sharpe Ratio Comparison

The current BASMX Sharpe Ratio is 2.41, which is comparable to the SSSYX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of BASMX 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.

Sharpe Ratios by Period

	BASMX	SSSYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.41	2.52	-0.10
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.74	0.85	-0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.81	0.13	+0.68
Sharpe Ratio (All Time) Calculated using the full available price history	0.81	0.12	+0.69

Drawdowns

BASMX vs. SSSYX - Drawdown Comparison

The maximum BASMX drawdown since its inception was -34.95%, smaller than the maximum SSSYX drawdown of -91.48%. Use the drawdown chart below to compare losses from any high point for BASMX and SSSYX.

Drawdown Indicators

	BASMX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-34.95%	-91.48%	+56.53%
Max Drawdown (1Y) Largest decline over 1 year	-8.92%	-8.88%	-0.04%
Max Drawdown (3Y) Largest decline over 3 years	-19.32%	-18.74%	-0.58%
Max Drawdown (5Y) Largest decline over 5 years	-25.12%	-24.49%	-0.63%
Max Drawdown (10Y) Largest decline over 10 years	-34.95%	-91.48%	+56.53%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-4.59%	-4.15%	-0.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.94%	1.90%	+0.04%

Volatility

BASMX vs. SSSYX - Volatility Comparison

iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) and State Street Equity 500 Index Fund Class K (SSSYX) have volatilities of 2.94% and 2.82%, 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

	BASMX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.94%	2.82%	+0.12%
Volatility (6M) Calculated over the trailing 6-month period	9.15%	8.96%	+0.19%
Volatility (1Y) Calculated over the trailing 1-year period	12.14%	11.85%	+0.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.38%	16.88%	+0.50%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.41%	124.46%	-106.05%

BASMX vs. SSSYX - Expense Ratio Comparison

BASMX has a 0.33% expense ratio, which is higher than SSSYX's 0.02% expense ratio.

Dividends

BASMX vs. SSSYX - Dividend Comparison

BASMX's dividend yield for the trailing twelve months is around 0.78%, less than SSSYX's 1.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BASMX iShares Total U.S. Stock Market Index Fund Investor A Shares	0.78%	0.86%	0.99%	1.19%	1.33%	1.33%	1.20%	1.90%	2.18%	1.93%	1.37%	0.00%
SSSYX State Street Equity 500 Index Fund Class K	1.29%	1.44%	1.63%	1.78%	2.16%	2.76%	1.86%	4.44%	5.18%	5.94%	2.07%	1.84%

Frequently Asked Questions

Can I hold both BASMX and SSSYX in my portfolio?

With a correlation of 0.99, BASMX 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, BASMX or SSSYX?

BASMX has higher volatility (2.94%) compared to SSSYX (2.82%). In terms of maximum drawdown, BASMX dropped -34.95% vs SSSYX's -91.48%.

Which has better risk-adjusted returns?

SSSYX currently has the higher Sharpe Ratio (2.52 vs 2.41), 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.