IDEF vs. IWM

Last updated Jun 24, 2026

IDEF (iShares Defense Industrials Active ETF) and IWM (iShares Russell 2000 ETF) are both exchange-traded funds - IDEF is a Aerospace & Defense fund actively managed by iShares, while IWM is a Small Cap Blend Equities fund tracking the Russell 2000 Index. IDEF is actively managed, while IWM is passively managed. Over the past year, IDEF returned 16.11% vs 40.90% for IWM. A 0.64 correlation means they provide meaningful diversification when combined. IDEF charges 0.55%/yr vs 0.19%/yr for IWM.

Performance

IDEF vs. IWM - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Defense Industrials Active ETF (IDEF) 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, IDEF achieves a 2.45% return, which is significantly lower than IWM's 20.47% return.

IDEF

• 1D: -0.60%
• 1M: -3.83%
• YTD: 2.45%
• 6M: 0.08%
• 1Y: 16.11%
• 3Y*: —
• 5Y*: —
• 10Y*: —

IWM

• 1D: -0.96%
• 1M: 3.82%
• YTD: 20.47%
• 6M: 17.64%
• 1Y: 40.90%
• 3Y*: 19.22%
• 5Y*: 6.27%
• 10Y*: 11.58%

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

IDEF vs. IWM - Yearly Performance Comparison

	2026 (YTD)	2025
IDEF iShares Defense Industrials Active ETF	2.45%	21.50%
IWM iShares Russell 2000 ETF	20.47%	18.79%

Correlation

The correlation between IDEF and IWM is 0.65, 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	0.65
Correlation (All Time) Calculated using the full available price history since May 21, 2025	0.64

The correlation between IDEF and IWM has been stable across timeframes, ranging from 0.64 to 0.65 - a consistent structural relationship.

IDEF vs. IWM - Sectors Allocation Comparison

Sectors	IDEF	IWM
Industrials	85.4%	17.3%
Technology	11.7%	20.1%
Energy	1.0%	6.0%
Basic Materials	0.5%	4.5%
Utilities	0.3%	3.1%
Financial Services	0.1%	15.5%
Communication Services	0.0%	1.7%
Consumer Cyclical	-	8.0%
Consumer Defensive	-	2.0%
Healthcare	-	15.6%
Real Estate	-	5.5%

Return for Risk

IDEF vs. IWM — Risk / Return Rank

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

IDEF

IDEF Risk / Return Rank: 22
IDEF Sharpe Ratio Rank: 22
IDEF Sortino Ratio Rank: 22
IDEF Omega Ratio Rank: 20
IDEF Calmar Ratio Rank: 24
IDEF Martin Ratio Rank: 22

IWM

IWM Risk / Return Rank: 67
IWM Sharpe Ratio Rank: 66
IWM Sortino Ratio Rank: 64
IWM Omega Ratio Rank: 57
IWM Calmar Ratio Rank: 75
IWM Martin Ratio Rank: 73

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.

IDEF vs. IWM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Defense Industrials Active ETF (IDEF) 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.

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.

	IDEF	IWM	Difference
Sharpe ratio: Return per unit of total volatility	0.73	2.08	-1.35
Sortino ratio: Return per unit of downside risk	1.18	2.86	-1.68
Omega ratio: Gain probability vs. loss probability	1.14	1.34	-0.20
Calmar ratio: Return relative to maximum drawdown	1.09	3.73	-2.63
Martin ratio: Return relative to average drawdown	2.57	13.18	-10.61

IDEF vs. IWM - Sharpe Ratio Comparison

The current IDEF Sharpe Ratio is 0.73, which is lower than the IWM Sharpe Ratio of 2.08. The chart below compares the historical Sharpe Ratios of IDEF 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.

Drawdowns

IDEF vs. IWM - Drawdown Comparison

The maximum IDEF drawdown since its inception was -14.78%, smaller than the maximum IWM drawdown of -59.05%. Use the drawdown chart below to compare losses from any high point for IDEF and IWM.

Drawdown Indicators

	IDEF	IWM	Difference
Max Drawdown Largest peak-to-trough decline	-14.78%	-59.05%	+44.27%
Max Drawdown (1Y) Largest decline over 1 year	-14.78%	-11.03%	-3.75%
Max Drawdown (3Y) Largest decline over 3 years	—	-27.50%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-31.91%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-41.13%	—
Current Drawdown Current decline from peak	-14.23%	-0.96%	-13.27%
Average Drawdown Average peak-to-trough decline	-4.30%	-10.75%	+6.45%
Ulcer Index Depth and duration of drawdowns from previous peaks	6.28%	3.11%	+3.17%

Volatility

IDEF vs. IWM - Volatility Comparison

iShares Defense Industrials Active ETF (IDEF) has a higher volatility of 8.84% compared to iShares Russell 2000 ETF (IWM) at 6.56%. This indicates that IDEF'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

	IDEF	IWM	Difference
Volatility (1M) Calculated over the trailing 1-month period	8.84%	6.56%	+2.28%
Volatility (6M) Calculated over the trailing 6-month period	18.93%	14.31%	+4.62%
Volatility (1Y) Calculated over the trailing 1-year period	22.10%	19.74%	+2.36%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.57%	22.61%	-1.04%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.57%	23.06%	-1.49%

IDEF vs. IWM - Expense Ratio Comparison

IDEF has a 0.55% expense ratio, which is higher than IWM's 0.19% expense ratio.

Dividends

IDEF vs. IWM - Dividend Comparison

IDEF's dividend yield for the trailing twelve months is around 0.34%, less than IWM's 0.90% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IDEF iShares Defense Industrials Active ETF	0.34%	0.17%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
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%

Frequently Asked Questions

Can I hold both IDEF and IWM in my portfolio?

IDEF and IWM have a correlation of 0.65, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IDEF or IWM?

IDEF has higher volatility (8.84%) compared to IWM (6.56%). In terms of maximum drawdown, IDEF dropped -14.78% vs IWM's -59.05%.

Which ETF is better, IDEF or IWM?

On 1-year performance, IWM leads with 40.90% vs 16.11% for IDEF. On fees, IWM is cheaper at 0.19% per year. On volatility, IWM has been the lower-risk option at 6.56%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, IDEF or IWM?

Over the 1-year period, IWM has performed better with a 40.90% return vs 16.11%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IDEF or IWM?

IWM is cheaper with a 0.19% expense ratio, compared with 0.55% for IDEF.

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

IWM has the higher dividend yield at 0.90%, compared with 0.34% for IDEF.

What is the main difference between IDEF and IWM?

IDEF is categorized as Aerospace & Defense, while IWM is Small Cap Blend Equities. Their fees differ too: 0.55% for IDEF and 0.19% for IWM.

Which has better risk-adjusted returns?

IWM currently has the higher Sharpe Ratio (2.08 vs 0.73), 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.