ACSGvsIWOETF Comparison
ETF 1
ACSG
American Century Small Cap Growth Insights ETF
This fund is part of
US Small Cap Growth
-0.14%
VS
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. Both ETFs have the same top 3 sector exposures: Healthcare, Technology and Industrials. ACSG is more expensive with a Total Expense Ratio (TER) of 0.49%, versus 0.24% for IWO. ACSG is up 13.96% year-to-date (YTD) with +$43M in YTD flows. IWO performs worse with 11.95% YTD performance, and -$570M 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
Historic performance and flows
Data as of 09/16/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | ACSG IWO | -8.51%-8.46% | -2.66%-5.20% | +13.96%+11.95% | n/a+15.45% | n/a+59.41% | n/a+23.61% |
| Flows | ACSG IWO | +$21M+$347M | +$32M+$164M | +$43M-$570M | --$383M | --$615M | --$337M |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | ACSG IWO | +18.45%+18.62% | n/a+22.38% | n/a+22.98% | n/a+24.72% |
| Max drawdown | ACSG IWO | -8.52%-8.65% | n/a-14.82% | n/a-28.47% | n/a-40.45% |
| Max drawdown duration | ACSG IWO | 31d31d | n/a84d | n/a280d | n/a1409d |
Trading data
ACSG | IWO | |
Last sale 9/17/2026 at 1:30 PM | $363.67 | |
| Previous close 09/16/2026 | $361.11 | |
| Consolidated volume 09/16/2026 | ||
| 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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ACSG
is actively managed and doesn’t replicate an indexACSG | IWO | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/17/2026 at 1:30 PM
Live
Closed
ACSG | IWO | |
|---|---|---|
| Last price | – | $363.67 |
| 1D performance | – | +0.71% |
| AuM | $50.59 M | $14.13 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 | 297 | 1095 |
| Asset class | - | Equities |
| Trailing 12m distribution yield | Join | Join |
| Inception date | October 14, 2025 | July 24, 2000 |
| ESG | No | No |
Exposure
Countries
ACSG
USA
93.41%
Other
6.59%
IWO
USA
96.07%
Other
3.93%
Sectors
ACSG
Healthcare
27.11%
Technology
16.77%
Industrials
15.92%
Finance
14.55%
Other
25.66%
IWO
Healthcare
29.4%
Technology
17.79%
Industrials
13.73%
Finance
13.29%
Other
25.79%
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Diversification
ACSG
Total weight of top 15 holdings out of 15
12.13%
IWO
Total weight of top 15 holdings out of 15
8.65%
Top 15 holdings
Data as of July 31, 2026
ACSG
Krystal Biotech, Inc.
1.06%
Plexus Corp.
0.96%
Hexcel Corp.
0.92%
AAR Corp.
0.85%
10X Genomics, Inc.
0.85%
CECO Environmental Corp.
0.84%
ESCO Technologies, Inc.
0.81%
Argan, Inc.
0.81%
Crinetics Pharmaceuticals, Inc.
0.77%
Life Time Group Holdings, Inc.
0.73%
Littelfuse, Inc.
0.72%
Sensient Technologies Corp.
0.71%
Enova International, Inc.
0.70%
Novanta, Inc.
0.70%
Miami International Holdings, Inc.
0.70%
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 ACSG and IWO
How have the ACSG and IWO ETFs performed in 2026?
As of September 16, 2026, ACSG is up 13.96% year-to-date (YTD), while IWO has returned 11.95%. That puts ACSG better performer ahead so far this year.
Which ETF is attracting more investor money: ACSG or IWO?
Year-to-date, the ACSG ETF saw +$43M in flows, compared to -$570M for IWO.
Which ETF is bigger: ACSG or IWO?
As of September 16, 2026, ACSG holds $50.59 M in assets under management (AUM), while IWO manages $14.13 B.
What sectors do the ACSG and IWO ETFs invest in?
ACSG leans toward sectors like Healthcare, Technology and Industrials. Meanwhile, IWO focuses on Healthcare, Technology and Industrials.
What are the top holdings of the ACSG ETF and IWO ETF?
ACSG top holdings include Krystal Biotech, Inc., Plexus Corp. and Hexcel Corp.. IWO holds in its top three: Moog, Inc., BrightSpring Health Services, Inc. and Glaukos Corp..
Which ETF is more diversified: ACSG or IWO?
ACSG holds 300 securities with 12.13% of its assets in the top 15. IWO has 1102 securities and a top 15 weight of 8.65%.
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