IWMvsIWOETF Comparison

ETF 1

IWM

iShares Russell 2000 ETF

This fund is part of

US Small Cap

+0.85%

Full IWM fund page

ETF 2

IWO

iShares Russell 2000 Growth ETF

This fund is part of

US Small Cap Growth

+0.69%

Full IWO fund page

iShares Russell 2000 ETF (IWM) belongs to the US Small Cap segment. iShares Russell 2000 Growth ETF (IWO) is part of the US Small Cap Growth segment. IWM's top 3 sector exposures are Finance, Healthcare and Technology. In contrast, IWO's top sector exposures are Healthcare, Technology and Industrials. IWM is less expensive with a Total Expense Ratio (TER) of 0.19%, versus 0.24% for IWO. IWM is up 19.79% year-to-date (YTD) with -$7.18B in YTD flows. IWO performs worse with 16.13% YTD performance, and -$662M in YTD flows. Run a side-by-side ETF comparison of IWM and IWO below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.

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IWM vs IWO performance and flow charts

Performance

Cumulative Flows

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Data Services

Historic performance and flows

Data as of 09/02/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	IWM IWO	-0.86%-0.98%	+0.98%-1.88%	+19.79%+16.13%	+26.93%+23.20%	+62.95%+60.51%	+36.48%+24.45%
Flows	IWM IWO	-$886M+$141M	-$2.69B+$204M	-$7.18B-$662M	-$3.59B-$430M	-$3.11B-$647M	-$5.59B-$323M

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	IWM IWO	+16.80%+22.01%	+18.89%+22.32%	+21.25%+22.97%	+22.51%+24.71%
Max drawdown	IWM IWO	-4.76%-7.65%	-11.03%-14.82%	-27.52%-28.47%	-31.96%-40.45%
Max drawdown duration	IWM IWO	17d44d	82d84d	289d280d	1093d1409d

Trading data

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	IWM	IWO
Last sale 9/3/2026 at 6:49 PM	$294.93	$376.36
Previous close 09/02/2026	$294.01	$375.11
Consolidated volume 09/02/2026
Average volume 30 days
Average discount or premium 30 days
Average Bid/Ask spread 30 days

Replication quality

Data as of August 31, 2026

1-year trailing difference

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	IWM	IWO
Tracking error
Tracking difference
1 year cumulative return difference
Best
Worst
Daily return difference
Average
Worst

Main metrics

Last update 9/3/2026 at 6:49 PM

Live

Closed

	IWM	IWO
Last price	$294.93	$376.36
1D performance	+0.31%	+0.33%
AuM	$79.88 B	$14.58 B
E/R	0.19%	0.24%

Characteristics

	IWM	IWO
Management strategy	Passive	Passive
Provider	iShares	iShares
Benchmark	Russell 2000 Index	Russell 2000 Growth Index
N° of holdings	1919	1073
Asset class	Equities	Equities
Trailing 12m distribution yield	Join	Join
Inception date	May 22, 2000	July 24, 2000
ESG	No	No

More IWM data on Trackinsight

More IWO data on Trackinsight

Exposure

Countries

IWM

USA

95.12%

Other

4.88%

IWO

USA

95.67%

Other

4.33%

Sectors

IWM

Finance

26.45%

Healthcare

20.2%

Technology

11.89%

Industrials

10.45%

Other

31.03%

IWO

Healthcare

29.33%

Technology

17.8%

Industrials

13.58%

Finance

12.99%

Other

26.3%

Diversification

IWM

Total weight of top 15 holdings out of 15

4.93%

IWO

Total weight of top 15 holdings out of 15

8.65%

Top 15 holdings

Data as of July 31, 2026

IWM

BlackRock Cash Funds - Treasury

0.46%

Moog, Inc.

0.39%

BrightSpring Health Services, Inc.

0.38%

Hut 8 Corp.

0.36%

UMB Financial Corp.

0.35%

Cytokinetics, Inc.

0.34%

ViaSat, Inc.

0.32%

Glaukos Corp.

0.31%

Krystal Biotech, Inc.

0.31%

CareTrust REIT, Inc.

0.30%

Old National Bancorp

0.30%

Brinker International, Inc.

0.29%

Crinetics Pharmaceuticals, Inc.

0.28%

HealthEquity, Inc.

0.28%

JFrog Ltd.

0.27%

IWO

Moog, Inc.

0.76%

BrightSpring Health Services, Inc.

0.76%

Glaukos Corp.

0.62%

Krystal Biotech, Inc.

0.61%

Brinker International, Inc.

0.58%

Crinetics Pharmaceuticals, Inc.

0.55%

HealthEquity, Inc.

0.55%

JFrog Ltd.

0.54%

Protagonist Therapeutics, Inc.

0.54%

StoneX Group, Inc.

0.54%

Ryman Hospitality Properties, Inc.

0.53%

FirstCash Holdings, Inc.

0.53%

ESCO Technologies, Inc.

0.53%

Argan, Inc.

0.51%

InterDigital, Inc.

0.50%

Frequently asked questions about IWM and IWO

How have the IWM and IWO ETFs performed in 2026?

As of September 2, 2026, IWM is up 19.79% year-to-date (YTD), while IWO has returned 16.13%. That puts IWM better performer ahead so far this year.

Which ETF is attracting more investor money: IWM or IWO?

Year-to-date, the IWM ETF saw -$7.18B in flows, compared to -$662M for IWO.

Which ETF is more volatile: IWM or IWO?

Over the past year, IWM had a volatility of 18.89%, while IWO experienced 22.32%.

Which ETF is bigger: IWM or IWO?

As of September 2, 2026, IWM holds $79.88 B in assets under management (AUM), while IWO manages $14.58 B.

What sectors do the IWM and IWO ETFs invest in?

IWM leans toward sectors like Finance, Healthcare and Technology. Meanwhile, IWO focuses on Healthcare, Technology and Industrials.

What are the top holdings of the IWM ETF and IWO ETF?

IWM top holdings include BlackRock Cash Funds - Treasury, Moog, Inc. and BrightSpring Health Services, Inc.. IWO holds in its top three: Moog, Inc., BrightSpring Health Services, Inc. and Glaukos Corp..

IWMvsIWOETF Comparison

iShares Russell 2000 ETF

iShares Russell 2000 Growth ETF

IWM vs IWO performance and flow charts

Performance

Cumulative Flows

Get all the metrics on this page, and more, through a reliable ETF data feed

Countries

Sectors

Diversification

Top 15 holdings

How have the IWM and IWO ETFs performed in 2026?

As of September 2, 2026, IWM is up 19.79% year-to-date (YTD), while IWO has returned 16.13%. That puts IWM better performer ahead so far this year.

Which ETF is attracting more investor money: IWM or IWO?

Year-to-date, the IWM ETF saw -$7.18B in flows, compared to -$662M for IWO.

Which ETF is more volatile: IWM or IWO?

Over the past year, IWM had a volatility of 18.89%, while IWO experienced 22.32%.

Which ETF is bigger: IWM or IWO?

As of September 2, 2026, IWM holds $79.88 B in assets under management (AUM), while IWO manages $14.58 B.

What sectors do the IWM and IWO ETFs invest in?

IWM leans toward sectors like Finance, Healthcare and Technology. Meanwhile, IWO focuses on Healthcare, Technology and Industrials.

What are the top holdings of the IWM ETF and IWO ETF?

IWM top holdings include BlackRock Cash Funds - Treasury, Moog, Inc. and BrightSpring Health Services, Inc.. IWO holds in its top three: Moog, Inc., BrightSpring Health Services, Inc. and Glaukos Corp..

Which ETF is more diversified: IWM or IWO?

IWM holds 1957 securities with 4.93% of its assets in the top 15. IWO has 1102 securities and a top 15 weight of 8.65%.

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