IWM
iShares Russell 2000 ETF
SMB
Adj. R2
0.986
Rel. Sharpe
0.798
Mkt beta
1.02
AUM
US$73.2B
MER
0.19%
Valuation
142
ETF comparison
Verified factor-similar pair
IWM vs SPSM
These two ETFs meet the same FF6 US comparison criteria: US-listed equity ETFs, the same USD model basis, at least one material non-market factor, and 100% overlap in statistically significant material factor exposure.
SMB
Similarity score
88
Verified similar
The score combines exposure-level distance, factor-vector shape, market-beta closeness, and a small backtested relative-Sharpe term.
Quick Read
- SPSM has the higher backtested relative Sharpe (1.027 vs 0.798).
- SPSM has the lower published fee (0.03% vs 0.19%).
- SPSM is cheaper on dividend valuation (117 vs 142, where 100 is each fund's historical median).
- IWM has the stronger regression fit (adjusted R-squared 0.986 vs 0.978).
These are screening signals, not a complete review of portfolio construction, turnover, taxes, or trading quality.
SPSM
State Street SPDR Portfolio S&P 600 Small Cap ETF
SMB
Adj. R2
0.978
Rel. Sharpe
1.027
Mkt beta
0.98
AUM
US$14.7B
MER
0.03%
Valuation
117
Factor Exposure Match
Blue bars compare raw factor beta magnitude. Green bars compare absolute t-stat strength. Dim bars indicate the t-stat is below 1.96.
SMB
diff -0.10
HML
diff -0.08
RMW
diff -0.16
CMA
diff -0.01
UMD
diff -0.04
Why This Pair Matches
Exposure level
86
Exposure shape
99
Mkt beta diff
0.04
Rel. Sharpe diff
0.229
This comparison focuses on measured factor exposure. It does not compare holdings methodology, turnover, tax handling, or issuer process. Backtested relative Sharpe is a secondary signal rather than a stand-alone forecast. See methodology.
Monthly updates
Get the next US ETF leaders update
Get one monthly email when the US leaders table refreshes, plus methodology and comparison-page updates.
Monthly leaders refresh
Download-access updates
Low-volume research notes
One monthly email when the data drop lands. This browser will remember you after signup.