IWOvsACSGETF Comparison
VS
ETF 2
ACSG
American Century Small Cap Growth Insights ETF
This fund is part of
US Small Cap Growth
+0.66%
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. Both ETFs have the same top 3 sector exposures: Healthcare, Technology and Industrials. IWO is less expensive with a Total Expense Ratio (TER) of 0.24%, versus 0.49% for ACSG. IWO is up 13.91% year-to-date (YTD) with -$570M in YTD flows. ACSG performs better with 16.27% YTD performance, and +$43M 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
Historic performance and flows
Data as of 09/11/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | IWO ACSG | -5.53%-5.57% | -2.69%+0.66% | +13.91%+16.27% | +16.94%n/a | +59.50%n/a | +26.01%n/a |
| Flows | IWO ACSG | +$308M+$22M | +$183M+$33M | -$570M+$43M | -$383M- | -$720M- | -$337M- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | IWO ACSG | +18.92%+18.57% | +22.37%n/a | +22.97%n/a | +24.72%n/a |
| Max drawdown | IWO ACSG | -7.65%-7.48% | -14.82%n/a | -28.47%n/a | -40.45%n/a |
| Max drawdown duration | IWO ACSG | 44d26d | 84dn/a | 280dn/a | 1409dn/a |
Trading data
IWO | ACSG | |
Last sale 9/14/2026 at 5:10 PM | $367.18 | |
| Previous close 09/11/2026 | $367.63 | |
| Consolidated volume 09/11/2026 | ||
| 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 indexIWO | ACSG | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/14/2026 at 5:10 PM
Live
Closed
IWO | ACSG | |
|---|---|---|
| Last price | $367.18 | – |
| 1D performance | -0.12% | – |
| AuM | $14.39 B | $51.61 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 | 1095 | 297 |
| Asset class | Equities | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | July 24, 2000 | October 14, 2025 |
| ESG | No | No |
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Exposure
Countries
IWO
USA
96.07%
Other
3.93%
ACSG
USA
93.41%
Other
6.59%
Sectors
IWO
Healthcare
29.4%
Technology
17.79%
Industrials
13.73%
Finance
13.29%
Other
25.79%
ACSG
Healthcare
27.11%
Technology
16.77%
Industrials
15.92%
Finance
14.55%
Other
25.66%
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Diversification
IWO
Total weight of top 15 holdings out of 15
8.65%
ACSG
Total weight of top 15 holdings out of 15
12.13%
Top 15 holdings
Data as of July 31, 2026
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%
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%
Frequently asked questions about IWO and ACSG
How have the IWO and ACSG ETFs performed in 2026?
As of September 11, 2026, IWO is up 13.91% year-to-date (YTD), while ACSG has returned 16.27%. That puts ACSG better performer ahead so far this year.
Which ETF is attracting more investor money: IWO or ACSG?
Year-to-date, the IWO ETF saw -$570M in flows, compared to +$43M for ACSG.
Which ETF is bigger: IWO or ACSG?
As of September 11, 2026, IWO holds $14.39 B in assets under management (AUM), while ACSG manages $51.61 M.
What sectors do the IWO and ACSG ETFs invest in?
IWO leans toward sectors like Healthcare, Technology and Industrials. Meanwhile, ACSG focuses on Healthcare, Technology and Industrials.
What are the top holdings of the IWO ETF and ACSG ETF?
IWO top holdings include Moog, Inc., BrightSpring Health Services, Inc. and Glaukos Corp.. ACSG holds in its top three: Krystal Biotech, Inc., Plexus Corp. and Hexcel Corp..
Which ETF is more diversified: IWO or ACSG?
IWO holds 1102 securities with 8.65% of its assets in the top 15. ACSG has 300 securities and a top 15 weight of 12.13%.
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