RESMvsIWMETF Comparison
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Columbia Research Enhanced Small Cap ETF (RESM) belongs to the US Multi-Factor segment. iShares Russell 2000 ETF (IWM) is part of the US Small Cap segment. Both ETFs have the same top 3 sector exposures: Finance, Healthcare and Technology. RESM is more expensive with a Total Expense Ratio (TER) of 0.32%, versus 0.19% for IWM. RESM is up 18.11% year-to-date (YTD) with +$397K in YTD flows. IWM performs worse with 16.51% YTD performance, and -$5.87B in YTD flows. Run a side-by-side ETF comparison of RESM and IWM 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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RESM vs IWM performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/15/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | RESM IWM | -5.60%-6.01% | -0.83%-2.95% | +18.11%+16.51% | n/a+20.66% | n/a+61.26% | n/a+36.82% |
| Flows | RESM IWM | -+$939M | +$2M-$427M | +$397K-$5.87B | --$3.40B | --$346M | --$3.26B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | RESM IWM | +12.15%+13.77% | n/a+18.88% | n/a+21.24% | n/a+22.50% |
| Max drawdown | RESM IWM | -5.88%-6.32% | n/a-11.03% | n/a-27.52% | n/a-31.96% |
| Max drawdown duration | RESM IWM | 30d30d | n/a82d | n/a289d | n/a1093d |
Trading data
RESM | IWM | |
Last sale 9/16/2026 at 1:30 PM | $23.40 | $283.92 |
| Previous close 09/15/2026 | $23.48 | $285.14 |
| Consolidated volume 09/15/2026 | ||
| 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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RESM
is actively managed and doesn’t replicate an indexRESM | IWM | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/16/2026 at 1:30 PM
Live
Closed
RESM | IWM | |
|---|---|---|
| Last price | $23.40 | $283.92 |
| 1D performance | -0.32% | -0.43% |
| AuM | $5.88 M | $78.79 B |
| E/R | 0.32% | 0.19% |
Characteristics
RESM | IWM | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | Columbia Threadneedle Investments | iShares |
| Benchmark | - | Russell 2000 Index |
| N° of holdings | 1014 | 1945 |
| Asset class | - | Equities |
| Trailing 12m distribution yield | Join | Join |
| Inception date | December 11, 2025 | May 22, 2000 |
| ESG | No | No |
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Exposure
Countries
RESM
USA
94.17%
Other
5.83%
IWM
USA
95.53%
Other
4.47%
Sectors
RESM
Finance
24.51%
Healthcare
20.16%
Technology
13.24%
Industrials
10.24%
Other
31.85%
IWM
Finance
26.78%
Healthcare
20.22%
Technology
11.82%
Industrials
10.54%
Other
30.64%
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Diversification
RESM
Total weight of top 15 holdings out of 15
6.77%
IWM
Total weight of top 15 holdings out of 15
4.93%
Top 15 holdings
Data as of July 31, 2026
RESM
UMB Financial Corp.
0.53%
ViaSat, Inc.
0.51%
Moog, Inc.
0.50%
JFrog Ltd.
0.50%
Glaukos Corp.
0.49%
CareTrust REIT, Inc.
0.47%
InterDigital, Inc.
0.46%
Old National Bancorp
0.45%
Columbia Short Term Cash Fund
0.44%
FirstCash Holdings, Inc.
0.42%
BrightSpring Health Services, Inc.
0.42%
Brinker International, Inc.
0.40%
HealthEquity, Inc.
0.40%
Oscar Health, Inc.
0.39%
Ryman Hospitality Properties, Inc.
0.39%
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%
Frequently asked questions about RESM and IWM
How have the RESM and IWM ETFs performed in 2026?
As of September 15, 2026, RESM is up 18.11% year-to-date (YTD), while IWM has returned 16.51%. That puts RESM better performer ahead so far this year.
Which ETF is attracting more investor money: RESM or IWM?
Year-to-date, the RESM ETF saw +$397K in flows, compared to -$5.87B for IWM.
Which ETF is bigger: RESM or IWM?
As of September 15, 2026, RESM holds $5.88 M in assets under management (AUM), while IWM manages $78.79 B.
What sectors do the RESM and IWM ETFs invest in?
RESM leans toward sectors like Finance, Healthcare and Technology. Meanwhile, IWM focuses on Finance, Healthcare and Technology.
What are the top holdings of the RESM ETF and IWM ETF?
RESM top holdings include UMB Financial Corp., ViaSat, Inc. and Moog, Inc.. IWM holds in its top three: BlackRock Cash Funds - Treasury, Moog, Inc. and BrightSpring Health Services, Inc..
Which ETF is more diversified: RESM or IWM?
RESM holds 1017 securities with 6.77% of its assets in the top 15. IWM has 1957 securities and a top 15 weight of 4.93%.
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