BDOIX vs. WFSPX

Last updated Jun 24, 2026

BDOIX (iShares MSCI Total International Index Fund) and WFSPX (iShares S&P 500 Index Fund Class K) are both mutual funds - BDOIX is a Foreign Large Cap Equities fund managed by BlackRock, while WFSPX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, BDOIX returned 10.28%/yr vs 15.68%/yr for WFSPX. Their correlation of 0.81 suggests significant overlap in exposure. BDOIX charges 0.15%/yr vs 0.03%/yr for WFSPX.

Performance

BDOIX vs. WFSPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares MSCI Total International Index Fund (BDOIX) and iShares S&P 500 Index Fund Class K (WFSPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BDOIX achieves a 16.59% return, which is significantly higher than WFSPX's 9.77% return. Over the past 10 years, BDOIX has underperformed WFSPX with an annualized return of 10.28%, while WFSPX has yielded a comparatively higher 15.68% annualized return.

BDOIX

• 1D: 0.21%
• 1M: 3.86%
• YTD: 16.59%
• 6M: 16.50%
• 1Y: 34.19%
• 3Y*: 20.22%
• 5Y*: 9.11%
• 10Y*: 10.28%

WFSPX

• 1D: -0.36%
• 1M: 0.10%
• YTD: 9.77%
• 6M: 8.77%
• 1Y: 25.45%
• 3Y*: 21.35%
• 5Y*: 13.57%
• 10Y*: 15.68%

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

BDOIX vs. WFSPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BDOIX iShares MSCI Total International Index Fund	16.59%	32.57%	5.19%	15.25%	-16.39%	7.59%	10.72%	21.19%	-13.94%	26.33%
WFSPX iShares S&P 500 Index Fund Class K	9.77%	17.83%	24.94%	26.25%	-18.14%	28.63%	18.43%	31.45%	-4.83%	21.27%

Correlation

The correlation between BDOIX and WFSPX is 0.82, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.82
Correlation (3Y) Calculated over the trailing 3-year period	0.75
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 Jun 30, 2011	0.81

The correlation between BDOIX and WFSPX has been stable across timeframes, ranging from 0.75 to 0.82 - a consistent structural relationship.

Return for Risk

BDOIX vs. WFSPX — Risk / Return Rank

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

BDOIX

BDOIX Risk / Return Rank: 67
BDOIX Sharpe Ratio Rank: 70
BDOIX Sortino Ratio Rank: 62
BDOIX Omega Ratio Rank: 69
BDOIX Calmar Ratio Rank: 70
BDOIX Martin Ratio Rank: 65

WFSPX

WFSPX Risk / Return Rank: 65
WFSPX Sharpe Ratio Rank: 63
WFSPX Sortino Ratio Rank: 57
WFSPX Omega Ratio Rank: 59
WFSPX Calmar Ratio Rank: 67
WFSPX Martin Ratio Rank: 78

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.

BDOIX vs. WFSPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares MSCI Total International Index Fund (BDOIX) and iShares S&P 500 Index Fund Class K (WFSPX). 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.

	BDOIX	WFSPX	Difference
Sharpe ratio: Return per unit of total volatility	2.25	2.15	+0.10
Sortino ratio: Return per unit of downside risk	3.02	2.90	+0.11
Omega ratio: Gain probability vs. loss probability	1.42	1.39	+0.03
Calmar ratio: Return relative to maximum drawdown	3.08	3.01	+0.07
Martin ratio: Return relative to average drawdown	11.95	13.58	-1.64

BDOIX vs. WFSPX - Sharpe Ratio Comparison

The current BDOIX Sharpe Ratio is 2.25, which is comparable to the WFSPX Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of BDOIX and WFSPX, 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

BDOIX vs. WFSPX - Drawdown Comparison

The maximum BDOIX drawdown since its inception was -35.10%, smaller than the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for BDOIX and WFSPX.

Drawdown Indicators

	BDOIX	WFSPX	Difference
Max Drawdown Largest peak-to-trough decline	-35.10%	-58.21%	+23.11%
Max Drawdown (1Y) Largest decline over 1 year	-11.37%	-8.90%	-2.47%
Max Drawdown (3Y) Largest decline over 3 years	-13.49%	-18.74%	+5.25%
Max Drawdown (5Y) Largest decline over 5 years	-30.01%	-24.51%	-5.50%
Max Drawdown (10Y) Largest decline over 10 years	-35.10%	-33.74%	-1.36%
Current Drawdown Current decline from peak	0.00%	-1.72%	+1.72%
Average Drawdown Average peak-to-trough decline	-8.47%	-12.76%	+4.29%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.93%	1.97%	+0.96%

Volatility

BDOIX vs. WFSPX - Volatility Comparison

iShares MSCI Total International Index Fund (BDOIX) has a higher volatility of 6.38% compared to iShares S&P 500 Index Fund Class K (WFSPX) at 4.67%. This indicates that BDOIX's price experiences larger fluctuations and is considered to be riskier than WFSPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BDOIX	WFSPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.38%	4.67%	+1.71%
Volatility (6M) Calculated over the trailing 6-month period	13.54%	9.83%	+3.71%
Volatility (1Y) Calculated over the trailing 1-year period	15.64%	12.49%	+3.15%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.63%	16.97%	-1.34%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.24%	18.07%	-1.83%

BDOIX vs. WFSPX - Expense Ratio Comparison

BDOIX has a 0.15% expense ratio, which is higher than WFSPX's 0.03% 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

BDOIX vs. WFSPX - Dividend Comparison

BDOIX's dividend yield for the trailing twelve months is around 2.52%, more than WFSPX's 1.59% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BDOIX iShares MSCI Total International Index Fund	2.52%	3.08%	2.89%	2.99%	2.91%	3.07%	2.00%	3.08%	3.33%	1.83%	3.57%	3.94%
WFSPX iShares S&P 500 Index Fund Class K	1.59%	1.72%	1.41%	1.50%	2.02%	1.82%	1.66%	1.99%	2.00%	1.62%	2.37%	2.49%

Frequently Asked Questions

Can I hold both BDOIX and WFSPX in my portfolio?

BDOIX and WFSPX have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BDOIX or WFSPX?

BDOIX has higher volatility (6.38%) compared to WFSPX (4.67%). In terms of maximum drawdown, BDOIX dropped -35.10% vs WFSPX's -58.21%.

Which has better risk-adjusted returns?

BDOIX currently has the higher Sharpe Ratio (2.25 vs 2.15), 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.