BTMKX vs. BASMX

Last updated Jun 3, 2026

BTMKX (iShares MSCI EAFE International Index Fund) and BASMX (iShares Total U.S. Stock Market Index Fund Investor A Shares) are both mutual funds - BTMKX is a Foreign Large Cap Equities fund tracking the MSCI EAFE Index, while BASMX is a Large Cap Blend Equities fund tracking the Russell 3000 Index. Both are passively managed. Over the past 10 years, BTMKX returned 9.38%/yr vs 14.76%/yr for BASMX. A 0.78 correlation means they provide meaningful diversification when combined. BTMKX charges 0.05%/yr vs 0.33%/yr for BASMX.

Performance

BTMKX vs. BASMX - Performance Comparison

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

Returns By Period

In the year-to-date period, BTMKX achieves a 9.29% return, which is significantly lower than BASMX's 11.34% return. Over the past 10 years, BTMKX has underperformed BASMX with an annualized return of 9.38%, while BASMX has yielded a comparatively higher 14.76% annualized return.

BTMKX

• 1D: -0.28%
• 1M: 2.62%
• YTD: 9.29%
• 6M: 12.25%
• 1Y: 21.09%
• 3Y*: 17.08%
• 5Y*: 8.76%
• 10Y*: 9.38%

BASMX

• 1D: 0.23%
• 1M: 5.00%
• YTD: 11.34%
• 6M: 11.67%
• 1Y: 28.86%
• 3Y*: 21.84%
• 5Y*: 12.64%
• 10Y*: 14.76%

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

BTMKX vs. BASMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BTMKX iShares MSCI EAFE International Index Fund	9.29%	31.70%	3.70%	18.37%	-14.04%	11.30%	8.07%	21.96%	-13.38%	25.17%
BASMX iShares Total U.S. Stock Market Index Fund Investor A Shares	11.34%	16.81%	23.46%	25.63%	-19.32%	25.26%	20.37%	30.71%	-5.57%	20.65%

Correlation

The correlation between BTMKX and BASMX is 0.77, 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	0.77
Correlation (3Y) Calculated over the trailing 3-year period	0.74
Correlation (5Y) Calculated over the trailing 5-year period	0.77
Correlation (10Y) Calculated over the trailing 10-year period	0.78
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.78

The correlation between BTMKX and BASMX has been stable across timeframes, ranging from 0.74 to 0.78 - a consistent structural relationship.

Return for Risk

BTMKX vs. BASMX — Risk / Return Rank

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

BTMKX

BTMKX Risk / Return Rank: 27
BTMKX Sharpe Ratio Rank: 26
BTMKX Sortino Ratio Rank: 25
BTMKX Omega Ratio Rank: 26
BTMKX Calmar Ratio Rank: 27
BTMKX Martin Ratio Rank: 32

BASMX

BASMX Risk / Return Rank: 69
BASMX Sharpe Ratio Rank: 69
BASMX Sortino Ratio Rank: 62
BASMX Omega Ratio Rank: 61
BASMX Calmar Ratio Rank: 71
BASMX Martin Ratio Rank: 81

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.

BTMKX vs. BASMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares MSCI EAFE International Index Fund (BTMKX) 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.

	BTMKX	BASMX	Difference
Sharpe ratio Return per unit of total volatility	1.49	2.43	-0.94
Sortino ratio Return per unit of downside risk	2.13	3.31	-1.18
Omega ratio Gain probability vs. loss probability	1.27	1.44	-0.17
Calmar ratio Return relative to maximum drawdown	2.01	3.29	-1.28
Martin ratio Return relative to average drawdown	7.54	15.12	-7.58
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BTMKX vs. BASMX - Sharpe Ratio Comparison

The current BTMKX Sharpe Ratio is 1.49, which is lower than the BASMX Sharpe Ratio of 2.43. The chart below compares the historical Sharpe Ratios of BTMKX and BASMX, 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

	BTMKX	BASMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.49	2.43	-0.94
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.54	0.73	-0.19
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	0.80	-0.24
Sharpe Ratio (All Time) Calculated using the full available price history	0.39	0.81	-0.41

Drawdowns

BTMKX vs. BASMX - Drawdown Comparison

The maximum BTMKX drawdown since its inception was -33.92%, roughly equal to the maximum BASMX drawdown of -34.95%. Use the drawdown chart below to compare losses from any high point for BTMKX and BASMX.

Drawdown Indicators

	BTMKX	BASMX	Difference
Max Drawdown Largest peak-to-trough decline	-33.92%	-34.95%	+1.03%
Max Drawdown (1Y) Largest decline over 1 year	-11.30%	-8.92%	-2.38%
Max Drawdown (3Y) Largest decline over 3 years	-13.66%	-19.32%	+5.66%
Max Drawdown (5Y) Largest decline over 5 years	-29.23%	-25.12%	-4.11%
Max Drawdown (10Y) Largest decline over 10 years	-33.92%	-34.95%	+1.03%
Current Drawdown Current decline from peak	-0.70%	0.00%	-0.70%
Average Drawdown Average peak-to-trough decline	-7.77%	-4.59%	-3.18%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.01%	1.94%	+1.07%

Volatility

BTMKX vs. BASMX - Volatility Comparison

iShares MSCI EAFE International Index Fund (BTMKX) has a higher volatility of 4.73% compared to iShares Total U.S. Stock Market Index Fund Investor A Shares (BASMX) at 2.94%. This indicates that BTMKX's price experiences larger fluctuations and is considered to be riskier than BASMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BTMKX	BASMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.73%	2.94%	+1.79%
Volatility (6M) Calculated over the trailing 6-month period	12.29%	9.16%	+3.13%
Volatility (1Y) Calculated over the trailing 1-year period	15.17%	12.16%	+3.01%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.17%	17.38%	-1.21%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.67%	18.41%	-1.74%

BTMKX vs. BASMX - Expense Ratio Comparison

BTMKX has a 0.05% expense ratio, which is lower than BASMX's 0.33% expense ratio.

Dividends

BTMKX vs. BASMX - Dividend Comparison

BTMKX's dividend yield for the trailing twelve months is around 3.43%, more than BASMX's 0.78% 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%
BTMKX iShares MSCI EAFE International Index Fund	3.43%	3.74%	3.43%	3.19%	2.80%	3.06%	1.99%	3.34%	4.58%	2.45%	2.85%	2.42%

Frequently Asked Questions

Can I hold both BTMKX and BASMX in my portfolio?

BTMKX and BASMX have a correlation of 0.77, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BTMKX or BASMX?

BTMKX has higher volatility (4.73%) compared to BASMX (2.94%). In terms of maximum drawdown, BTMKX dropped -33.92% vs BASMX's -34.95%.

Which has better risk-adjusted returns?

BASMX currently has the higher Sharpe Ratio (2.43 vs 1.49), 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.