RESMvsIWMWETF Comparison
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Columbia Research Enhanced Small Cap ETF (RESM) belongs to the US Multi-Factor segment. iShares Russell 2000 BuyWrite ETF (IWMW) is part of the Options Strategies segment. Both ETFs have the same top 3 sector exposures: Finance, Healthcare and Technology. RESM is less expensive with a Total Expense Ratio (TER) of 0.32%, versus 0.39% for IWMW. RESM is up 18.86% year-to-date (YTD) with +$397K in YTD flows. IWMW performs worse with 13.32% YTD performance, and +$24M in YTD flows. Run a side-by-side ETF comparison of RESM and IWMW 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 IWMW performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/14/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | RESM IWMW | -5.29%-3.71% | -0.21%+2.70% | +18.86%+13.32% | n/a+15.92% | n/an/a | n/an/a |
| Flows | RESM IWMW | --$821K | +$2M+$7M | +$397K+$24M | -+$31M | -- | -- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | RESM IWMW | +12.19%+9.84% | n/a+12.37% | n/an/a | n/an/a |
| Max drawdown | RESM IWMW | -5.33%-3.79% | n/a-6.92% | n/an/a | n/an/a |
| Max drawdown duration | RESM IWMW | 29d29d | n/a62d | n/an/a | n/an/a |
Trading data
RESM | IWMW | |
Last sale 9/14/2026 at 1:30 PM | $23.65 | $38.25 |
| Previous close 09/14/2026 | $23.72 | $38.55 |
| Consolidated volume 09/14/2026 | ||
| 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 | IWMW | |
|---|---|---|
| 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 1:30 PM
Live
Closed
RESM | IWMW | |
|---|---|---|
| Last price | $23.65 | $38.25 |
| 1D performance | -0.31% | -0.78% |
| AuM | $5.91 M | $57.88 M |
| E/R | 0.32% | 0.39% |
Characteristics
RESM | IWMW | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | Columbia Threadneedle Investments | iShares |
| Benchmark | - | Cboe FTSE Russell IWM 2% OTM BuyWrite Index |
| N° of holdings | 1014 | 1945 |
| Asset class | - | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | December 11, 2025 | March 14, 2024 |
| ESG | No | No |
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Exposure
Countries
RESM
USA
94.17%
Other
5.83%
IWMW
USA
96.06%
Other
3.94%
Sectors
RESM
Finance
24.51%
Healthcare
20.16%
Technology
13.24%
Industrials
10.24%
Other
31.85%
IWMW
Finance
26.88%
Healthcare
20.29%
Technology
11.87%
Industrials
10.58%
Other
30.37%
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Diversification
RESM
Total weight of top 15 holdings out of 15
6.77%
IWMW
Total weight of top 15 holdings out of 15
5.1%
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%
HealthEquity, Inc.
0.40%
Brinker International, Inc.
0.40%
Ryman Hospitality Properties, Inc.
0.39%
Oscar Health, Inc.
0.39%
IWMW
BlackRock Cash Funds - Treasury
0.61%
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.
0.28%
Frequently asked questions about RESM and IWMW
How have the RESM and IWMW ETFs performed in 2026?
As of September 14, 2026, RESM is up 18.86% year-to-date (YTD), while IWMW has returned 13.32%. That puts RESM better performer ahead so far this year.
Which ETF is attracting more investor money: RESM or IWMW?
Year-to-date, the RESM ETF saw +$397K in flows, compared to +$24M for IWMW.
Which ETF is bigger: RESM or IWMW?
As of September 14, 2026, RESM holds $5.91 M in assets under management (AUM), while IWMW manages $57.88 M.
What sectors do the RESM and IWMW ETFs invest in?
RESM leans toward sectors like Finance, Healthcare and Technology. Meanwhile, IWMW focuses on Finance, Healthcare and Technology.
What are the top holdings of the RESM ETF and IWMW ETF?
RESM top holdings include UMB Financial Corp., ViaSat, Inc. and Moog, Inc.. IWMW holds in its top three: BlackRock Cash Funds - Treasury, Moog, Inc. and BrightSpring Health Services, Inc..
Which ETF is more diversified: RESM or IWMW?
RESM holds 1017 securities with 6.77% of its assets in the top 15. IWMW has 1957 securities and a top 15 weight of 5.1%.
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