IWO vs. IWM

Last updated Jun 6, 2026

IWO (iShares Russell 2000 Growth ETF) and IWM (iShares Russell 2000 ETF) are both exchange-traded funds - IWO is a Small Cap Growth Equities fund tracking the Russell 2000 Growth Index, while IWM is a Small Cap Blend Equities fund tracking the Russell 2000 Index. Both are passively managed. Over the past 10 years, IWO returned 10.76%/yr vs 10.54%/yr for IWM. With a 0.97 correlation, they move nearly in lockstep. IWO charges 0.24%/yr vs 0.19%/yr for IWM.

Performance

IWO vs. IWM - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Russell 2000 Growth ETF (IWO) and iShares Russell 2000 ETF (IWM). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IWO achieves a 13.43% return, which is significantly lower than IWM's 14.62% return. Both investments have delivered pretty close results over the past 10 years, with IWO having a 10.76% annualized return and IWM not far behind at 10.54%.

IWO

• 1D: -4.34%
• 1M: -2.10%
• YTD: 13.43%
• 6M: 10.88%
• 1Y: 33.25%
• 3Y*: 16.40%
• 5Y*: 4.95%
• 10Y*: 10.76%

IWM

• 1D: -3.55%
• 1M: -1.80%
• YTD: 14.62%
• 6M: 12.89%
• 1Y: 36.52%
• 3Y*: 16.56%
• 5Y*: 5.66%
• 10Y*: 10.54%

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

IWO vs. IWM - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IWO iShares Russell 2000 Growth ETF	13.43%	12.90%	15.04%	18.51%	-26.27%	2.54%	34.68%	28.48%	-9.43%	22.25%
IWM iShares Russell 2000 ETF	14.62%	12.66%	11.38%	16.83%	-20.48%	14.54%	20.03%	25.39%	-11.12%	14.58%

Correlation

The correlation between IWO and IWM is 0.97 - 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	0.97
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.98
Correlation (10Y) Calculated over the trailing 10-year period	0.97
Correlation (All Time) Calculated using the full available price history since Jul 31, 2000	0.97

The correlation between IWO and IWM has been stable across timeframes, ranging from 0.97 to 0.98 - a consistent structural relationship.

IWO vs. IWM - Sectors Allocation Comparison

Sectors	IWO	IWM
Technology	23.6%	19.5%
Industrials	23.1%	17.1%
Healthcare	22.4%	15.8%
Financial Services	8.2%	15.8%
Consumer Cyclical	7.7%	7.8%
Basic Materials	4.2%	4.5%
Energy	3.5%	6.0%
Consumer Defensive	2.6%	2.1%
Communication Services	2.2%	2.0%
Real Estate	2.1%	5.7%
Utilities	0.7%	3.0%

Return for Risk

IWO vs. IWM — Risk / Return Rank

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

IWO

IWO Risk / Return Rank: 45
IWO Sharpe Ratio Rank: 46
IWO Sortino Ratio Rank: 44
IWO Omega Ratio Rank: 41
IWO Calmar Ratio Rank: 47
IWO Martin Ratio Rank: 49

IWM

IWM Risk / Return Rank: 59
IWM Sharpe Ratio Rank: 56
IWM Sortino Ratio Rank: 55
IWM Omega Ratio Rank: 51
IWM Calmar Ratio Rank: 68
IWM Martin Ratio Rank: 65

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.

IWO vs. IWM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Russell 2000 Growth ETF (IWO) and iShares Russell 2000 ETF (IWM). 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.

	IWO	IWM	Difference
Sharpe ratio: Return per unit of total volatility	1.53	1.88	-0.35
Sortino ratio: Return per unit of downside risk	2.13	2.60	-0.47
Omega ratio: Gain probability vs. loss probability	1.26	1.31	-0.05
Calmar ratio: Return relative to maximum drawdown	2.25	3.33	-1.08
Martin ratio: Return relative to average drawdown	8.04	11.78	-3.73
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IWO vs. IWM - Sharpe Ratio Comparison

The current IWO Sharpe Ratio is 1.53, which is comparable to the IWM Sharpe Ratio of 1.88. The chart below compares the historical Sharpe Ratios of IWO and IWM, 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

	IWO	IWM	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.53	1.88	-0.35
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.20	0.25	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.45	0.46	-0.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.28	0.36	-0.08

Drawdowns

IWO vs. IWM - Drawdown Comparison

The maximum IWO drawdown since its inception was -60.11%, roughly equal to the maximum IWM drawdown of -59.05%. Use the drawdown chart below to compare losses from any high point for IWO and IWM.

Drawdown Indicators

	IWO	IWM	Difference
Max Drawdown Largest peak-to-trough decline	-60.11%	-59.05%	-1.06%
Max Drawdown (1Y) Largest decline over 1 year	-14.87%	-11.03%	-3.84%
Max Drawdown (3Y) Largest decline over 3 years	-28.57%	-27.50%	-1.07%
Max Drawdown (5Y) Largest decline over 5 years	-40.51%	-31.91%	-8.60%
Max Drawdown (10Y) Largest decline over 10 years	-42.02%	-41.13%	-0.89%
Current Drawdown Current decline from peak	-4.34%	-3.55%	-0.79%
Average Drawdown Average peak-to-trough decline	-16.70%	-10.76%	-5.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.15%	3.11%	+1.04%

Volatility

IWO vs. IWM - Volatility Comparison

iShares Russell 2000 Growth ETF (IWO) has a higher volatility of 7.83% compared to iShares Russell 2000 ETF (IWM) at 6.65%. This indicates that IWO's price experiences larger fluctuations and is considered to be riskier than IWM based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IWO	IWM	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.83%	6.65%	+1.18%
Volatility (6M) Calculated over the trailing 6-month period	16.28%	14.00%	+2.28%
Volatility (1Y) Calculated over the trailing 1-year period	21.80%	19.54%	+2.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.56%	22.58%	+1.98%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.16%	23.06%	+1.10%

IWO vs. IWM - Expense Ratio Comparison

IWO has a 0.24% expense ratio, which is higher than IWM's 0.19% 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

IWO vs. IWM - Dividend Comparison

IWO's dividend yield for the trailing twelve months is around 0.41%, less than IWM's 0.90% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IWM iShares Russell 2000 ETF	0.90%	1.04%	1.15%	1.35%	1.48%	0.94%	1.04%	1.26%	1.40%	1.26%	1.38%	1.54%
IWO iShares Russell 2000 Growth ETF	0.41%	0.56%	0.80%	0.73%	0.73%	0.32%	0.44%	0.71%	0.76%	0.73%	0.97%	0.89%

Frequently Asked Questions

Can I hold both IWO and IWM in my portfolio?

With a correlation of 0.97, IWO and IWM 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, IWO or IWM?

IWO has higher volatility (7.83%) compared to IWM (6.65%). In terms of maximum drawdown, IWO dropped -60.11% vs IWM's -59.05%.

Which ETF is better, IWO or IWM?

On 10-year performance, IWO leads with 10.76% vs 10.54% for IWM. On fees, IWM is cheaper at 0.19% per year. On volatility, IWM has been the lower-risk option at 6.65%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, IWO or IWM?

Over the 10-year period, IWO has performed better with a 10.76% return vs 10.54%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IWO or IWM?

IWM is cheaper with a 0.19% expense ratio, compared with 0.24% for IWO.

Which ETF pays a higher dividend yield, IWO or IWM?

IWM has the higher dividend yield at 0.90%, compared with 0.41% for IWO.

What is the main difference between IWO and IWM?

IWO is categorized as Small Cap Growth Equities, while IWM is Small Cap Blend Equities. IWO tracks Russell 2000 Growth Index, while IWM tracks Russell 2000 Index. Their fees differ too: 0.24% for IWO and 0.19% for IWM.

Which has better risk-adjusted returns?

IWM currently has the higher Sharpe Ratio (1.88 vs 1.53), 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.