BSPIX vs. BASMX

Last updated Apr 2, 2026

Compare and contrast key facts about iShares S&P 500 Index Fund Institutional Class (BSPIX) and iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX).

BSPIX is a passively managed fund by iShares that tracks the performance of the S&P 500 Index. It was launched on Apr 28, 1993. BASMX is a passively managed fund by iShares that tracks the performance of the Russell 3000 Index. It was launched on Aug 13, 2015. Both BSPIX and BASMX are passive ETFs, meaning that they are not actively managed but aim to replicate the performance of the underlying index as closely as possible.

Performance

BSPIX vs. BASMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares S&P 500 Index Fund Institutional Class (BSPIX) and iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX). The values are adjusted to include any dividend payments, if applicable.

BSPIX vs. BASMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BSPIX iShares S&P 500 Index Fund Institutional Class	-4.63%	17.75%	24.85%	26.17%	-18.20%	28.55%	18.35%	31.35%	-4.87%	21.20%
BASMX iShares Total U.S. Stock Market Index Fund Investor A Shares	-4.03%	16.81%	23.46%	25.63%	-19.32%	25.26%	20.37%	30.71%	-5.57%	20.65%

Returns By Period

In the year-to-date period, BSPIX achieves a -4.63% return, which is significantly lower than BASMX's -4.03% return. Both investments have delivered pretty close results over the past 10 years, with BSPIX having a 13.85% annualized return and BASMX not far behind at 13.31%.

BSPIX

• 1D: 2.64%
• 1M: -5.29%
• YTD: -4.63%
• 6M: -2.48%
• 1Y: 16.90%
• 3Y*: 18.07%
• 5Y*: 11.61%
• 10Y*: 13.85%

BASMX

• 1D: 2.94%
• 1M: -5.13%
• YTD: -4.03%
• 6M: -2.11%
• 1Y: 17.26%
• 3Y*: 17.52%
• 5Y*: 10.30%
• 10Y*: 13.31%

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

BSPIX vs. BASMX - Expense Ratio Comparison

BSPIX has a 0.10% expense ratio, which is lower than BASMX's 0.33% expense ratio.

BASMX

iShares Total U.S. Stock Market Index Fund Investor A Shares

BSPIX

iShares S&P 500 Index Fund Institutional Class

Return for Risk

BSPIX vs. BASMX — Risk / Return Rank

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

BSPIX

BSPIX Risk / Return Rank: 51
BSPIX Sharpe Ratio Rank: 42
BSPIX Sortino Ratio Rank: 46
BSPIX Omega Ratio Rank: 49
BSPIX Calmar Ratio Rank: 54
BSPIX Martin Ratio Rank: 67

BASMX

BASMX Risk / Return Rank: 47
BASMX Sharpe Ratio Rank: 39
BASMX Sortino Ratio Rank: 42
BASMX Omega Ratio Rank: 45
BASMX Calmar Ratio Rank: 46
BASMX Martin Ratio Rank: 60

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.

BSPIX vs. BASMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares S&P 500 Index Fund Institutional Class (BSPIX) and iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX). 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.

	BSPIX	BASMX	Difference
Sharpe ratio Return per unit of total volatility	0.96	0.96	0.00
Sortino ratio Return per unit of downside risk	1.46	1.47	-0.01
Omega ratio Gain probability vs. loss probability	1.22	1.22	0.00
Calmar ratio Return relative to maximum drawdown	1.49	1.47	+0.02
Martin ratio Return relative to average drawdown	7.12	7.03	+0.09
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BSPIX vs. BASMX - Sharpe Ratio Comparison

The current BSPIX Sharpe Ratio is 0.96, which is comparable to the BASMX Sharpe Ratio of 0.96. The chart below compares the historical Sharpe Ratios of BSPIX and BASMX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	BSPIX	BASMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.96	0.96	0.00
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.69	0.60	+0.10
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.77	0.73	+0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.73	0.73	+0.01

Correlation

The correlation between BSPIX and BASMX is 0.99, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

BSPIX vs. BASMX - Dividend Comparison

BSPIX's dividend yield for the trailing twelve months is around 1.49%, more than BASMX's 0.89% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BSPIX iShares S&P 500 Index Fund Institutional Class	1.49%	1.66%	1.35%	1.44%	1.94%	1.76%	1.60%	1.92%	1.94%	1.57%	2.30%	2.42%
BASMX iShares Total U.S. Stock Market Index Fund Investor A Shares	0.89%	0.86%	0.99%	1.19%	1.33%	1.33%	1.20%	1.90%	2.18%	1.93%	1.37%	0.00%

Drawdowns

BSPIX vs. BASMX - Drawdown Comparison

The maximum BSPIX drawdown since its inception was -33.75%, roughly equal to the maximum BASMX drawdown of -34.95%. Use the drawdown chart below to compare losses from any high point for BSPIX and BASMX.

Drawdown Indicators

	BSPIX	BASMX	Difference
Max Drawdown Largest peak-to-trough decline	-33.75%	-34.95%	+1.20%
Max Drawdown (1Y) Largest decline over 1 year	-12.11%	-12.39%	+0.28%
Max Drawdown (5Y) Largest decline over 5 years	-24.55%	-25.12%	+0.57%
Max Drawdown (10Y) Largest decline over 10 years	-33.75%	-34.95%	+1.20%
Current Drawdown Current decline from peak	-6.50%	-6.24%	-0.26%
Average Drawdown Average peak-to-trough decline	-3.98%	-4.65%	+0.67%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.53%	2.59%	-0.06%

Volatility

BSPIX vs. BASMX - Volatility Comparison

The current volatility for iShares S&P 500 Index Fund Institutional Class (BSPIX) is 5.18%, while iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) has a volatility of 5.47%. This indicates that BSPIX experiences smaller price fluctuations and is considered to be less risky than BASMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BSPIX	BASMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.18%	5.47%	-0.29%
Volatility (6M) Calculated over the trailing 6-month period	9.45%	9.73%	-0.28%
Volatility (1Y) Calculated over the trailing 1-year period	18.21%	18.57%	-0.36%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.88%	17.39%	-0.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.00%	18.39%	-0.39%