IWMWvsRESMETF Comparison
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iShares Russell 2000 BuyWrite ETF (IWMW) belongs to the Options Strategies segment. Columbia Research Enhanced Small Cap ETF (RESM) is part of the US Multi-Factor segment. Both ETFs have the same top 3 sector exposures: Finance, Healthcare and Technology. IWMW is more expensive with a Total Expense Ratio (TER) of 0.39%, versus 0.32% for RESM. IWMW is up 12.52% year-to-date (YTD) with +$24M in YTD flows. RESM performs better with 18.11% YTD performance, and +$397K in YTD flows. Run a side-by-side ETF comparison of IWMW and RESM 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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IWMW vs RESM performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/15/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | IWMW RESM | -4.35%-5.60% | +1.98%-0.83% | +12.52%+18.11% | +15.10%n/a | n/an/a | n/an/a |
| Flows | IWMW RESM | -$821K- | +$7M+$2M | +$24M+$397K | +$31M- | -- | -- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | IWMW RESM | +9.88%+12.15% | +12.37%n/a | n/an/a | n/an/a |
| Max drawdown | IWMW RESM | -4.38%-5.88% | -6.92%n/a | n/an/a | n/an/a |
| Max drawdown duration | IWMW RESM | 30d30d | 62dn/a | n/an/a | n/an/a |
Trading data
IWMW | RESM | |
Last sale 9/15/2026 at 7:59 PM | $38.25 | $23.65 |
| Previous close 09/15/2026 | $38.55 | $23.65 |
| 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 indexIWMW | RESM | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/15/2026 at 7:59 PM
Live
Closed
IWMW | RESM | |
|---|---|---|
| Last price | $38.25 | $23.65 |
| 1D performance | -0.78% | -0.00% |
| AuM | $57.47 M | $5.88 M |
| E/R | 0.39% | 0.32% |
Characteristics
IWMW | RESM | |
|---|---|---|
| Management strategy | Passive | Active |
| Provider | iShares | Columbia Threadneedle Investments |
| Benchmark | Cboe FTSE Russell IWM 2% OTM BuyWrite Index | - |
| N° of holdings | 1945 | 1014 |
| Asset class | - | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | March 14, 2024 | December 11, 2025 |
| ESG | No | No |
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Exposure
Countries
IWMW
USA
96.06%
Other
3.94%
RESM
USA
94.17%
Other
5.83%
Sectors
IWMW
Finance
26.88%
Healthcare
20.29%
Technology
11.87%
Industrials
10.58%
Other
30.37%
RESM
Finance
24.51%
Healthcare
20.16%
Technology
13.24%
Industrials
10.24%
Other
31.85%
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Diversification
IWMW
Total weight of top 15 holdings out of 15
5.1%
RESM
Total weight of top 15 holdings out of 15
6.77%
Top 15 holdings
Data as of July 31, 2026
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%
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%
Frequently asked questions about IWMW and RESM
How have the IWMW and RESM ETFs performed in 2026?
As of September 15, 2026, IWMW is up 12.52% year-to-date (YTD), while RESM has returned 18.11%. That puts RESM better performer ahead so far this year.
Which ETF is attracting more investor money: IWMW or RESM?
Year-to-date, the IWMW ETF saw +$24M in flows, compared to +$397K for RESM.
Which ETF is bigger: IWMW or RESM?
As of September 15, 2026, IWMW holds $57.47 M in assets under management (AUM), while RESM manages $5.88 M.
What sectors do the IWMW and RESM ETFs invest in?
IWMW leans toward sectors like Finance, Healthcare and Technology. Meanwhile, RESM focuses on Finance, Healthcare and Technology.
What are the top holdings of the IWMW ETF and RESM ETF?
IWMW top holdings include BlackRock Cash Funds - Treasury, Moog, Inc. and BrightSpring Health Services, Inc.. RESM holds in its top three: UMB Financial Corp., ViaSat, Inc. and Moog, Inc..
Which ETF is more diversified: IWMW or RESM?
IWMW holds 1957 securities with 5.1% of its assets in the top 15. RESM has 1017 securities and a top 15 weight of 6.77%.
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