IOO vs. ACWI

Last updated Jun 4, 2026

IOO (iShares Global 100 ETF) and ACWI (iShares MSCI ACWI ETF) are both Global Equities funds from iShares - IOO tracks the S&P Global 100 Index (Net) while ACWI tracks the MSCI All Country World Index. Both are passively managed. Over the past 10 years, IOO returned 16.70%/yr vs 12.85%/yr for ACWI. Their correlation of 0.95 suggests significant overlap in exposure. IOO charges 0.40%/yr vs 0.32%/yr for ACWI.

Performance

IOO vs. ACWI - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Global 100 ETF (IOO) and iShares MSCI ACWI ETF (ACWI). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with IOO having a 12.26% return and ACWI slightly lower at 12.13%. Over the past 10 years, IOO has outperformed ACWI with an annualized return of 16.70%, while ACWI has yielded a comparatively lower 12.85% annualized return.

IOO

• 1D: -1.33%
• 1M: 5.37%
• YTD: 12.26%
• 6M: 12.43%
• 1Y: 38.24%
• 3Y*: 25.48%
• 5Y*: 16.68%
• 10Y*: 16.70%

ACWI

• 1D: -0.83%
• 1M: 5.28%
• YTD: 12.13%
• 6M: 12.96%
• 1Y: 29.18%
• 3Y*: 21.15%
• 5Y*: 11.28%
• 10Y*: 12.85%

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

IOO vs. ACWI - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IOO iShares Global 100 ETF	12.26%	27.02%	26.54%	27.71%	-16.34%	26.03%	18.61%	30.01%	-6.22%	23.56%
ACWI iShares MSCI ACWI ETF	12.13%	22.41%	17.45%	22.27%	-18.39%	18.66%	16.34%	26.59%	-9.19%	24.33%

Correlation

The correlation between IOO and ACWI is 0.93, 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	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.94
Correlation (All Time) Calculated using the full available price history since Mar 31, 2008	0.95

The correlation between IOO and ACWI has been stable across timeframes, ranging from 0.92 to 0.95 - a consistent structural relationship.

IOO vs. ACWI - Sectors Allocation Comparison

Sectors	IOO	ACWI
Technology	46.2%	29.4%
Communication Services	11.0%	9.0%
Financial Services	9.1%	16.1%
Consumer Cyclical	8.4%	9.3%
Healthcare	8.4%	8.1%
Consumer Defensive	5.6%	5.0%
Industrials	4.8%	10.9%
Energy	3.6%	4.2%
Basic Materials	1.7%	3.7%
Utilities	0.5%	2.6%
Real Estate	0.2%	1.8%

Return for Risk

IOO vs. ACWI — Risk / Return Rank

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

IOO

IOO Risk / Return Rank: 82
IOO Sharpe Ratio Rank: 85
IOO Sortino Ratio Rank: 84
IOO Omega Ratio Rank: 82
IOO Calmar Ratio Rank: 75
IOO Martin Ratio Rank: 85

ACWI

ACWI Risk / Return Rank: 66
ACWI Sharpe Ratio Rank: 68
ACWI Sortino Ratio Rank: 67
ACWI Omega Ratio Rank: 67
ACWI Calmar Ratio Rank: 59
ACWI Martin Ratio Rank: 71

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.

IOO vs. ACWI - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Global 100 ETF (IOO) and iShares MSCI ACWI ETF (ACWI). 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.

	IOO	ACWI	Difference
Sharpe ratio: Return per unit of total volatility	2.84	2.29	+0.55
Sortino ratio: Return per unit of downside risk	3.85	3.17	+0.68
Omega ratio: Gain probability vs. loss probability	1.50	1.41	+0.09
Calmar ratio: Return relative to maximum drawdown	3.87	3.01	+0.85
Martin ratio: Return relative to average drawdown	17.94	13.53	+4.42
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IOO vs. ACWI - Sharpe Ratio Comparison

The current IOO Sharpe Ratio is 2.84, which is comparable to the ACWI Sharpe Ratio of 2.29. The chart below compares the historical Sharpe Ratios of IOO and ACWI, 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

	IOO	ACWI	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.84	2.29	+0.55
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.98	0.71	+0.28
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.94	0.75	+0.19
Sharpe Ratio (All Time) Calculated using the full available price history	0.39	0.43	-0.03

Drawdowns

IOO vs. ACWI - Drawdown Comparison

The maximum IOO drawdown since its inception was -55.85%, roughly equal to the maximum ACWI drawdown of -56.00%. Use the drawdown chart below to compare losses from any high point for IOO and ACWI.

Drawdown Indicators

	IOO	ACWI	Difference
Max Drawdown Largest peak-to-trough decline	-55.85%	-56.00%	+0.15%
Max Drawdown (1Y) Largest decline over 1 year	-9.94%	-9.73%	-0.21%
Max Drawdown (3Y) Largest decline over 3 years	-19.19%	-16.55%	-2.64%
Max Drawdown (5Y) Largest decline over 5 years	-23.52%	-26.42%	+2.90%
Max Drawdown (10Y) Largest decline over 10 years	-31.43%	-33.53%	+2.10%
Current Drawdown Current decline from peak	-1.33%	-0.83%	-0.50%
Average Drawdown Average peak-to-trough decline	-11.27%	-8.61%	-2.66%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.14%	2.16%	-0.02%

Volatility

IOO vs. ACWI - Volatility Comparison

iShares Global 100 ETF (IOO) and iShares MSCI ACWI ETF (ACWI) have volatilities of 3.81% and 3.93%, 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

	IOO	ACWI	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.81%	3.93%	-0.12%
Volatility (6M) Calculated over the trailing 6-month period	10.59%	10.29%	+0.30%
Volatility (1Y) Calculated over the trailing 1-year period	13.54%	12.78%	+0.76%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.04%	16.05%	+0.99%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.78%	17.11%	+0.67%

IOO vs. ACWI - Expense Ratio Comparison

IOO has a 0.40% expense ratio, which is higher than ACWI's 0.32% expense ratio.

Dividends

IOO vs. ACWI - Dividend Comparison

IOO's dividend yield for the trailing twelve months is around 0.82%, less than ACWI's 1.38% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACWI iShares MSCI ACWI ETF	1.38%	1.55%	1.70%	1.88%	1.79%	1.71%	1.43%	2.33%	2.18%	1.94%	2.19%	2.56%
IOO iShares Global 100 ETF	0.82%	0.92%	1.08%	1.49%	2.00%	1.53%	1.49%	2.02%	2.54%	2.23%	2.75%	2.89%

Frequently Asked Questions

Can I hold both IOO and ACWI in my portfolio?

With a correlation of 0.93, IOO and ACWI 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, IOO or ACWI?

ACWI has higher volatility (3.93%) compared to IOO (3.81%). In terms of maximum drawdown, IOO dropped -55.85% vs ACWI's -56.00%.

Which ETF is better, IOO or ACWI?

On 10-year performance, IOO leads with 16.70% vs 12.85% for ACWI. On fees, ACWI is cheaper at 0.32% per year. On volatility, IOO has been the lower-risk option at 3.81%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, IOO or ACWI?

Over the 10-year period, IOO has performed better with a 16.70% return vs 12.85%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IOO or ACWI?

ACWI is cheaper with a 0.32% expense ratio, compared with 0.40% for IOO.

Which ETF pays a higher dividend yield, IOO or ACWI?

ACWI has the higher dividend yield at 1.38%, compared with 0.82% for IOO.

What is the main difference between IOO and ACWI?

IOO tracks S&P Global 100 Index (Net), while ACWI tracks MSCI All Country World Index. Their fees differ too: 0.40% for IOO and 0.32% for ACWI.

Which has better risk-adjusted returns?

IOO currently has the higher Sharpe Ratio (2.84 vs 2.29), 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.