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IWOvsACSGETF Comparison

ETF 1

IWO

iShares Russell 2000 Growth ETF

This fund is part of

US Small Cap Growth

+0.55%

Full IWO fund page

VS

ETF 2

ACSG

American Century Small Cap Growth Insights ETF

This fund is part of

US Small Cap Growth

+0.55%

Full ACSG fund page

iShares Russell 2000 Growth ETF (IWO) and American Century Small Cap Growth Insights ETF (ACSG) belong to the same industry segment: US Small Cap Growth. IWO's top 3 sector exposures are Information Technology, Industrials and Health Care. In contrast, ACSG's top sector exposures are Industrials, Information Technology and Health Care. IWO is less expensive with a Total Expense Ratio (TER) of 0.24%, versus 0.49% for ACSG. IWO is up 17.69% year-to-date (YTD) with -$714M in YTD flows. ACSG performs worse with 16.25% YTD performance, and +$11M in YTD flows. Run a side-by-side ETF comparison of IWO and ACSG 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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IWO vs ACSG performance and flow charts

Performance

Cumulative Flows

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Daily, global ETF data for advanced analysis or integration into apps (API), from our partner Trackinsight.

Data Services

Historic performance and flows

Data as of 06/12/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	IWO ACSG	+3.23%+2.82%	+20.22%+19.77%	+17.69%+16.25%	+36.25%n/a	+61.86%n/a	+27.73%n/a
Flows	IWO ACSG	-$85M+$3M	-$82M+$8M	-$714M+$11M	-$600M-	-$877M-	-$291M-

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	IWO ACSG	+25.75%+25.36%	+22.24%n/a	+22.73%n/a	+24.68%n/a
Max drawdown	IWO ACSG	-6.26%-6.45%	-14.82%n/a	-28.47%n/a	-40.45%n/a
Max drawdown duration	IWO ACSG	13d13d	84dn/a	280dn/a	1409dn/a

Trading data

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	IWO	ACSG
Last sale 6/12/2026 at 1:30 PM	$380.39
Previous close 06/12/2026	$377.91
Consolidated volume 06/12/2026
Average volume 30 days
Average discount or premium 30 days
Average Bid/Ask spread 30 days

Replication quality

Data as of May 29, 2026

1-year trailing difference

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ACSG

is actively managed and doesn’t replicate an index

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

Main metrics

Last update 6/12/2026 at 1:30 PM

Live

Closed

	IWO	ACSG
Last price	$380.39	–
1D performance	+0.66%	–
AuM	$14.75 B	$20.17 M
E/R	0.24%	0.49%

Characteristics

	IWO	ACSG
Management strategy	Passive	Active
Provider	iShares	American Century Investments
Benchmark	Russell 2000 Growth Index	-
N° of holdings	890	208
Asset class	Equities	-
Trailing 12m distribution yield	Join	Join
Inception date	July 24, 2000	October 14, 2025
ESG	No	No

More IWO data on Trackinsight

More ACSG data on Trackinsight

Exposure

Countries

IWO

USA

92.8%

Other

7.2%

ACSG

USA

76.41%

Other

23.59%

Sectors

IWO

Information Techn.

21.84%

Industrials

21.02%

Health Care

19.04%

Consumer Discreti.

7.83%

Other

30.27%

ACSG

Industrials

21.52%

Information Techn.

19.16%

Health Care

16.93%

Consumer Discreti.

8.77%

Other

33.62%

Diversification

IWO

Total weight of top 15 holdings out of 15

15.88%

ACSG

Total weight of top 15 holdings out of 15

17.44%

Top 15 holdings

Data as of April 30, 2026

IWO

BLOOM ENERGY CORP

3.64%

CREDO TECHNOLOGY GROUP HOLDING

1.65%

FABRINET

1.45%

IONQ

0.92%

STERLING INFRASTRUCTURE INC

0.90%

ADVANCED ENERGY INDUSTRIES

0.85%

US65290E1010

0.82%

MODINE MNFC CO

0.78%

SITIME CORP

0.74%

RAMBUS

0.73%

DYCOM INDUSTRIES

0.71%

VIAVI SOLUTIONS INC

0.71%

KRATOS DEFENSE AND SECURITY SOLS

0.67%

BRIDGEBIO PHARMA

0.66%

GUARDANT HEALTH INC

0.64%

ACSG

BLOOM ENERGY CORP

3.19%

CREDO TECHNOLOGY GROUP HOLDING

1.61%

FABRINET

1.39%

STERLING INFRASTRUCTURE INC

1.21%

PLEXUS

1.01%

SILICON LABS

0.99%

RBC BEARINGS

0.98%

CECO ENVIRONMENTAL

0.97%

POWELL INDUSTRIES

0.90%

ARGAN

0.90%

MODINE MNFC CO

0.88%

VICTORY CAPITAL HOLDINGS INC

0.87%

HEXCEL

0.86%

SITIME CORP

0.85%

HAYWARD HOLDINGS

0.83%

Frequently asked questions about IWO and ACSG

How have the IWO and ACSG ETFs performed in 2026?

As of June 12, 2026, IWO is up 17.69% year-to-date (YTD), while ACSG has returned 16.25%. That puts IWO better performer ahead so far this year.

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

Year-to-date, the IWO ETF saw -$714M in flows, compared to +$11M for ACSG.

Which ETF is bigger: IWO or ACSG?

As of June 12, 2026, IWO holds $14.75 B in assets under management (AUM), while ACSG manages $20.17 M.

What sectors do the IWO and ACSG ETFs invest in?

IWO leans toward sectors like Information Technology, Industrials and Health Care. Meanwhile, ACSG focuses on Industrials, Information Technology and Health Care.

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

IWO top holdings include BLOOM ENERGY CORP, CREDO TECHNOLOGY GROUP HOLDING and FABRINET. ACSG holds in its top three: BLOOM ENERGY CORP, CREDO TECHNOLOGY GROUP HOLDING and FABRINET.

IWOvsACSGETF Comparison

iShares Russell 2000 Growth ETF

American Century Small Cap Growth Insights ETF

IWO vs ACSG 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 IWO and ACSG ETFs performed in 2026?

As of June 12, 2026, IWO is up 17.69% year-to-date (YTD), while ACSG has returned 16.25%. That puts IWO better performer ahead so far this year.

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

Year-to-date, the IWO ETF saw -$714M in flows, compared to +$11M for ACSG.

Which ETF is bigger: IWO or ACSG?

As of June 12, 2026, IWO holds $14.75 B in assets under management (AUM), while ACSG manages $20.17 M.

What sectors do the IWO and ACSG ETFs invest in?

IWO leans toward sectors like Information Technology, Industrials and Health Care. Meanwhile, ACSG focuses on Industrials, Information Technology and Health Care.

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

IWO top holdings include BLOOM ENERGY CORP, CREDO TECHNOLOGY GROUP HOLDING and FABRINET. ACSG holds in its top three: BLOOM ENERGY CORP, CREDO TECHNOLOGY GROUP HOLDING and FABRINET.

Which ETF is more diversified: IWO or ACSG?

IWO holds 1090 securities with 15.88% of its assets in the top 15. ACSG has 208 securities and a top 15 weight of 17.44%.

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