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ACSGvsIWOETF Comparison

ETF 1

ACSG

American Century Small Cap Growth Insights ETF

This fund is part of

US Small Cap Growth

-0.22%

Full ACSG fund page

VS

ETF 2

IWO

iShares Russell 2000 Growth ETF

This fund is part of

US Small Cap Growth

-0.22%

Full IWO fund page

American Century Small Cap Growth Insights ETF (ACSG) and iShares Russell 2000 Growth ETF (IWO) belong to the same industry segment: US Small Cap Growth. ACSG's top 3 sector exposures are Industrials, Information Technology and Health Care. In contrast, IWO's top sector exposures are Health Care, Information Technology and Industrials. ACSG is more expensive with a Total Expense Ratio (TER) of 0.49%, versus 0.24% for IWO. ACSG is up 9.26% year-to-date (YTD) with +$7M in YTD flows. IWO performs better with 10.61% YTD performance, and -$809M in YTD flows. Run a side-by-side ETF comparison of ACSG 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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ACSG vs IWO 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 04/24/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	ACSG IWO	+11.56%+16.32%	+3.73%+3.32%	+9.26%+10.61%	n/a+41.72%	n/a+64.12%	n/a+17.90%
Flows	ACSG IWO	+$1M-$129M	+$7M-$530M	+$7M-$809M	--$1.22B	--$1.05B	--$576M

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	ACSG IWO	+25.30%+25.63%	n/a+21.38%	n/a+22.42%	n/a+24.55%
Max drawdown	ACSG IWO	-11.90%-12.94%	n/a-14.82%	n/a-28.47%	n/a-40.45%
Max drawdown duration	ACSG IWO	77d76d	n/a84d	n/a280d	n/a1409d

Trading data

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	ACSG	IWO
Last sale 4/28/2026 at 1:30 PM		$351.50
Previous close 04/27/2026		$357.83
Consolidated volume 04/27/2026
Average volume 30 days
Average discount or premium 30 days
Average Bid/Ask spread 30 days

Replication quality

Data as of March 31, 2026

1-year trailing difference

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ACSG

is actively managed and doesn’t replicate an index

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

Main metrics

Last update 4/28/2026 at 1:30 PM

Live

Closed

	ACSG	IWO
Last price	–	$351.50
1D performance	–	-1.77%
AuM	$14.50 M	$13.78 B
E/R	0.49%	0.24%

Characteristics

	ACSG	IWO
Management strategy	Active	Passive
Provider	American Century Investments	iShares
Benchmark	-	Russell 2000 Growth Index
N° of holdings	208	897
Asset class	-	Equities
Trailing 12m distribution yield	Join	Join
Inception date	October 14, 2025	July 24, 2000
ESG	No	No

More ACSG data on Trackinsight

More IWO data on Trackinsight

Exposure

Countries

ACSG

USA

76.64%

Other

23.36%

IWO

USA

93.17%

Other

6.83%

Sectors

ACSG

Industrials

20.76%

Information Techn.

18.35%

Health Care

17.5%

Consumer Discreti.

9.25%

Other

34.14%

IWO

Health Care

21.43%

Information Techn.

20.12%

Industrials

19.42%

Consumer Discreti.

8.17%

Financials

7.05%

Other

23.81%

Diversification

ACSG

Total weight of top 15 holdings out of 15

16.07%

IWO

Total weight of top 15 holdings out of 15

13.39%

Top 15 holdings

Data as of March 31, 2026

ACSG

BLOOM ENERGY CORP

2.11%

FABRINET

1.29%

PLEXUS

1.16%

STERLING INFRASTRUCTURE INC

1.15%

SILICON LABS

1.06%

RBC BEARINGS

1.05%

ATI INC

0.98%

CREDO TECHNOLOGY GROUP HOLDING

0.97%

CONSTRUCTION PARTNERS INC

0.94%

HEXCEL

0.92%

DIGITALOCEAN HOLDINGS

0.91%

CARPENTER TECHNOLOGY

0.90%

ARGAN

0.89%

MODINE MNFC CO

0.88%

CECO ENVIRONMENTAL

0.86%

IWO

BLOOM ENERGY CORP

1.99%

FABRINET

1.26%

CREDO TECHNOLOGY GROUP HOLDING

1.02%

US65290E1010

0.94%

KRATOS DEFENSE AND SECURITY SOLS

0.86%

ADVANCED ENERGY INDUSTRIES

0.82%

STERLING INFRASTRUCTURE INC

0.81%

BRIDGEBIO PHARMA

0.79%

GUARDANT HEALTH INC

0.77%

MODINE MNFC CO

0.76%

ENSIGN GROUP

0.76%

IONQ

0.67%

DYCOM INDUSTRIES

0.66%

US78473E1038

0.65%

COEUR MINING INC

0.64%

Frequently asked questions about ACSG and IWO

How have the ACSG and IWO ETFs performed in 2026?

As of April 24, 2026, ACSG is up 9.26% year-to-date (YTD), while IWO has returned 10.61%. That puts IWO better performer ahead so far this year.

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

Year-to-date, the ACSG ETF saw +$7M in flows, compared to -$809M for IWO.

Which ETF is bigger: ACSG or IWO?

As of April 24, 2026, ACSG holds $14.50 M in assets under management (AUM), while IWO manages $13.78 B.

What sectors do the ACSG and IWO ETFs invest in?

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

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

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

ACSGvsIWOETF Comparison

American Century Small Cap Growth Insights ETF

iShares Russell 2000 Growth ETF

ACSG 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 ACSG and IWO ETFs performed in 2026?

As of April 24, 2026, ACSG is up 9.26% year-to-date (YTD), while IWO has returned 10.61%. That puts IWO better performer ahead so far this year.

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

Year-to-date, the ACSG ETF saw +$7M in flows, compared to -$809M for IWO.

Which ETF is bigger: ACSG or IWO?

As of April 24, 2026, ACSG holds $14.50 M in assets under management (AUM), while IWO manages $13.78 B.

What sectors do the ACSG and IWO ETFs invest in?

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

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

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

Which ETF is more diversified: ACSG or IWO?

ACSG holds 209 securities with 16.07% of its assets in the top 15. IWO has 1099 securities and a top 15 weight of 13.39%.

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