IWB vs. VOO

Last updated Jun 4, 2026

IWB (iShares Russell 1000 ETF) and VOO (Vanguard S&P 500 ETF) are both exchange-traded funds - IWB is a Large Cap Blend Equities fund tracking the Russell 1000 Index, while VOO is a S&P 500 fund tracking the S&P 500 Index. Both are passively managed. Over the past 10 years, IWB returned 15.17%/yr vs 15.56%/yr for VOO. With a 0.99 correlation, they move nearly in lockstep. IWB charges 0.15%/yr vs 0.03%/yr for VOO.

Performance

IWB vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Russell 1000 ETF (IWB) and Vanguard S&P 500 ETF (VOO). 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 IWB having a 10.54% return and VOO slightly higher at 10.91%. Both investments have delivered pretty close results over the past 10 years, with IWB having a 15.17% annualized return and VOO not far ahead at 15.56%.

IWB

• 1D: -0.71%
• 1M: 4.95%
• YTD: 10.54%
• 6M: 10.51%
• 1Y: 27.03%
• 3Y*: 22.02%
• 5Y*: 12.99%
• 10Y*: 15.17%

VOO

• 1D: -0.70%
• 1M: 5.04%
• YTD: 10.91%
• 6M: 10.93%
• 1Y: 28.04%
• 3Y*: 22.44%
• 5Y*: 13.90%
• 10Y*: 15.56%

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

IWB vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IWB iShares Russell 1000 ETF	10.54%	17.18%	24.32%	26.39%	-19.19%	26.32%	20.77%	31.06%	-4.90%	21.52%
VOO Vanguard S&P 500 ETF	10.91%	17.82%	24.98%	26.32%	-18.17%	28.79%	18.32%	31.37%	-4.50%	21.77%

Correlation

The correlation between IWB and VOO is 1.00 - 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	1.00
Correlation (3Y) Calculated over the trailing 3-year period	1.00
Correlation (5Y) Calculated over the trailing 5-year period	1.00
Correlation (10Y) Calculated over the trailing 10-year period	1.00
Correlation (All Time) Calculated using the full available price history since Sep 10, 2010	0.99

The correlation between IWB and VOO has been stable across timeframes, ranging from 0.99 to 1.00 - a consistent structural relationship.

IWB vs. VOO - Sectors Allocation Comparison

Sectors	IWB	VOO
Technology	36.6%	35.7%
Financial Services	11.3%	11.6%
Communication Services	10.4%	11.3%
Consumer Cyclical	10.0%	10.2%
Industrials	8.6%	8.3%
Healthcare	8.6%	8.5%
Consumer Defensive	4.5%	4.9%
Energy	3.3%	3.5%
Utilities	2.5%	2.4%
Real Estate	2.1%	1.9%
Basic Materials	1.9%	1.8%

Return for Risk

IWB vs. VOO — Risk / Return Rank

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

IWB

IWB Risk / Return Rank: 67
IWB Sharpe Ratio Rank: 67
IWB Sortino Ratio Rank: 66
IWB Omega Ratio Rank: 66
IWB Calmar Ratio Rank: 61
IWB Martin Ratio Rank: 73

VOO

VOO Risk / Return Rank: 70
VOO Sharpe Ratio Rank: 71
VOO Sortino Ratio Rank: 70
VOO Omega Ratio Rank: 70
VOO Calmar Ratio Rank: 62
VOO Martin Ratio Rank: 75

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.

IWB vs. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Russell 1000 ETF (IWB) and Vanguard S&P 500 ETF (VOO). 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.

	IWB	VOO	Difference
Sharpe ratio Return per unit of total volatility	2.28	2.39	-0.11
Sortino ratio Return per unit of downside risk	3.12	3.25	-0.14
Omega ratio Gain probability vs. loss probability	1.41	1.43	-0.02
Calmar ratio Return relative to maximum drawdown	3.06	3.16	-0.10
Martin ratio Return relative to average drawdown	14.09	14.73	-0.63
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IWB vs. VOO - Sharpe Ratio Comparison

The current IWB Sharpe Ratio is 2.28, which is comparable to the VOO Sharpe Ratio of 2.39. The chart below compares the historical Sharpe Ratios of IWB and VOO, 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

	IWB	VOO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.28	2.39	-0.11
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.76	0.83	-0.07
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.84	0.87	-0.03
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.89	-0.44

Drawdowns

IWB vs. VOO - Drawdown Comparison

The maximum IWB drawdown since its inception was -55.38%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for IWB and VOO.

Drawdown Indicators

	IWB	VOO	Difference
Max Drawdown Largest peak-to-trough decline	-55.38%	-33.99%	-21.39%
Max Drawdown (1Y) Largest decline over 1 year	-8.86%	-8.90%	+0.04%
Max Drawdown (3Y) Largest decline over 3 years	-19.09%	-18.69%	-0.40%
Max Drawdown (5Y) Largest decline over 5 years	-25.20%	-24.52%	-0.68%
Max Drawdown (10Y) Largest decline over 10 years	-34.60%	-33.99%	-0.61%
Current Drawdown Current decline from peak	-0.71%	-0.70%	-0.01%
Average Drawdown Average peak-to-trough decline	-10.86%	-3.69%	-7.17%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.92%	1.91%	+0.01%

Volatility

IWB vs. VOO - Volatility Comparison

iShares Russell 1000 ETF (IWB) and Vanguard S&P 500 ETF (VOO) have volatilities of 2.88% and 2.84%, 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

	IWB	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.88%	2.84%	+0.04%
Volatility (6M) Calculated over the trailing 6-month period	8.97%	8.90%	+0.07%
Volatility (1Y) Calculated over the trailing 1-year period	11.93%	11.80%	+0.13%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.10%	16.81%	+0.29%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.14%	18.01%	+0.13%

IWB vs. VOO - Expense Ratio Comparison

IWB has a 0.15% expense ratio, which is higher than VOO'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

IWB vs. VOO - Dividend Comparison

IWB's dividend yield for the trailing twelve months is around 0.91%, less than VOO's 1.03% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IWB iShares Russell 1000 ETF	0.91%	1.00%	1.14%	1.31%	1.56%	1.09%	1.37%	1.71%	2.06%	1.64%	1.89%	1.95%
VOO Vanguard S&P 500 ETF	1.03%	1.13%	1.24%	1.46%	1.69%	1.25%	1.54%	1.88%	2.06%	1.78%	2.02%	2.10%

Frequently Asked Questions

Can I hold both IWB and VOO in my portfolio?

With a correlation of 1.00, IWB and VOO 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, IWB or VOO?

IWB has higher volatility (2.88%) compared to VOO (2.84%). In terms of maximum drawdown, IWB dropped -55.38% vs VOO's -33.99%.

Which ETF is better, IWB or VOO?

On 10-year performance, VOO leads with 15.56% vs 15.17% for IWB. On fees, VOO is cheaper at 0.03% per year. Their volatility is very similar. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, IWB or VOO?

Over the 10-year period, VOO has performed better with a 15.56% return vs 15.17%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IWB or VOO?

VOO is cheaper with a 0.03% expense ratio, compared with 0.15% for IWB.

Which ETF pays a higher dividend yield, IWB or VOO?

VOO has the higher dividend yield at 1.03%, compared with 0.91% for IWB.

What is the main difference between IWB and VOO?

IWB is categorized as Large Cap Blend Equities, while VOO is S&P 500. IWB tracks Russell 1000 Index, while VOO tracks S&P 500 Index. They also come from different issuers: iShares and Vanguard. Their fees differ too: 0.15% for IWB and 0.03% for VOO.

Which has better risk-adjusted returns?

VOO currently has the higher Sharpe Ratio (2.39 vs 2.28), 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.