SPSMvsIWMETF Comparison
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State Street SPDR Portfolio S&P 600 Small Cap ETF (SPSM) belongs to the US Multi-Factor segment. iShares Russell 2000 ETF (IWM) is part of the US Small Cap segment. SPSM's top 3 sector exposures are Finance, Technology and Industrials. In contrast, IWM's top sector exposures are Finance, Healthcare and Technology. SPSM is less expensive with a Total Expense Ratio (TER) of 0.03%, versus 0.19% for IWM. SPSM is up 18.88% year-to-date (YTD) with +$832M in YTD flows. IWM performs worse with 17.86% YTD performance, and -$7.40B in YTD flows. Run a side-by-side ETF comparison of SPSM 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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SPSM vs IWM performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/11/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | SPSM IWM | -4.12%-3.94% | +0.24%-0.30% | +18.88%+17.86% | +20.06%+21.27% | +53.22%+62.48% | +40.38%+38.04% |
| Flows | SPSM IWM | -$226M-$587M | +$289M-$1.12B | +$832M-$7.40B | +$1.01B-$3.45B | +$3.80B-$2.40B | +$8.25B-$5.38B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SPSM IWM | +13.02%+13.86% | +16.60%+18.89% | +20.23%+21.24% | +21.25%+22.51% |
| Max drawdown | SPSM IWM | -5.96%-5.67% | -8.68%-11.03% | -27.91%-27.52% | -27.91%-31.96% |
| Max drawdown duration | SPSM IWM | 26d26d | 59d82d | 380d289d | 380d1093d |
Trading data
SPSM | IWM | |
Last sale 9/11/2026 at 1:30 PM | $55.31 | $288.89 |
| Previous close 09/10/2026 | $55.01 | $287.70 |
| Consolidated volume 09/10/2026 | ||
| 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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SPSM | 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 9/11/2026 at 1:30 PM
Live
Closed
SPSM | IWM | |
|---|---|---|
| Last price | $55.31 | $288.89 |
| 1D performance | +0.55% | +0.41% |
| AuM | $16.32 B | $78.38 B |
| E/R | 0.03% | 0.19% |
Characteristics
SPSM | IWM | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | State Street Investment Management | iShares |
| Benchmark | S&P SmallCap 600 GARP Index | Russell 2000 Index |
| N° of holdings | 600 | 1945 |
| Asset class | Equities | Equities |
| Trailing 12m distribution yield | Join | Join |
| Inception date | July 8, 2013 | May 22, 2000 |
| ESG | No | No |
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Exposure
Countries
SPSM
USA
97.23%
Other
2.77%
IWM
USA
95.53%
Other
4.47%
Sectors
SPSM
Finance
26.65%
Technology
12.84%
Industrials
12.29%
Healthcare
10.65%
Consumer Cyclical.
8.02%
Other
29.55%
IWM
Finance
26.78%
Healthcare
20.22%
Technology
11.82%
Industrials
10.54%
Other
30.64%
Diversification
SPSM
Total weight of top 15 holdings out of 15
7.34%
IWM
Total weight of top 15 holdings out of 15
4.93%
Top 15 holdings
Data as of July 31, 2026
SPSM
Corcept Therapeutics, Inc.
0.61%
ViaSat, Inc.
0.58%
Glaukos Corp.
0.54%
Match Group, Inc.
0.51%
Brinker International, Inc.
0.51%
Jackson Financial, Inc.
0.48%
Ryman Hospitality Properties, Inc.
0.47%
Element Solutions, Inc.
0.47%
FormFactor, Inc.
0.46%
Protagonist Therapeutics, Inc.
0.46%
ESCO Technologies, Inc.
0.45%
Alkermes Plc
0.45%
CarMax, Inc.
0.45%
StoneX Group, Inc.
0.45%
Eastman Chemical Co.
0.44%
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 SPSM and IWM
How have the SPSM and IWM ETFs performed in 2026?
As of September 11, 2026, SPSM is up 18.88% year-to-date (YTD), while IWM has returned 17.86%. That puts SPSM better performer ahead so far this year.
Which ETF is attracting more investor money: SPSM or IWM?
Year-to-date, the SPSM ETF saw +$832M in flows, compared to -$7.40B for IWM.
Which ETF is more volatile: SPSM or IWM?
Over the past year, SPSM had a volatility of 16.6%, while IWM experienced 18.89%.
Which ETF is bigger: SPSM or IWM?
As of September 11, 2026, SPSM holds $16.32 B in assets under management (AUM), while IWM manages $78.38 B.
What sectors do the SPSM and IWM ETFs invest in?
SPSM leans toward sectors like Finance, Technology and Industrials. Meanwhile, IWM focuses on Finance, Healthcare and Technology.
What are the top holdings of the SPSM ETF and IWM ETF?
SPSM top holdings include Corcept Therapeutics, Inc., ViaSat, Inc. and Glaukos Corp.. IWM holds in its top three: BlackRock Cash Funds - Treasury, Moog, Inc. and BrightSpring Health Services, Inc..
Which ETF is more diversified: SPSM or IWM?
SPSM holds 602 securities with 7.34% of its assets in the top 15. IWM has 1957 securities and a top 15 weight of 4.93%.
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