ESML
iShares ESG Aware MSCI USA Small-Cap ETF
SMB
Adj. R2
0.978
Rel. Sharpe
0.820
Mkt beta
0.98
AUM
US$2.3B
MER
0.17%
Valuation
124
ETF comparison
Verified factor-similar pair
ESML vs PRFZ
These US-listed equity ETFs share verified FF6 US factor exposure. The modeled volatility of their factor-return difference is at or below 3% annualized on both the same 36-month window and a longer factor-history check.
SMB
Current similarity score
91
Very close factor fit
The score is 100 for identical fitted exposures and 80 at the 3% modeled tracking-error limit. It includes market and non-market factors; it does not indicate which fund earned or is expected to earn more. How to read this score.
Quick Read
- PRFZ has the higher backtested relative Sharpe (0.939 vs 0.820).
- ESML has the lower published fee (0.17% vs 0.34%).
- ESML is cheaper on dividend valuation (124 vs 141, where 100 is each fund's historical median).
- ESML has the stronger regression fit (adjusted R-squared 0.978 vs 0.971).
These are screening signals, not a complete review of portfolio construction, turnover, taxes, or trading quality.
PRFZ
Invesco RAFI US 1500 Small-Mid ETF
SMB
Adj. R2
0.971
Rel. Sharpe
0.939
Mkt beta
0.96
AUM
US$2.7B
MER
0.34%
Valuation
141
Market beta uses the common 36-month window through 2026-08. Adjusted R² and relative Sharpe describe each fund's separately published full-history model.
Factor Exposure Match
Blue bars compare factor beta magnitude from the same 36 months shown above. Green bars compare absolute t-stat strength; dim bars indicate |t| below 1.96. Every factor enters the distance calculation regardless of its t-statistic.
SMB
diff -0.14
HML
diff +0.01
RMW
diff -0.01
CMA
diff +0.04
UMD
diff +0.01
What Happened Over the Same 36 Months
ESML adjusted total-return CAGR
16.56%
PRFZ adjusted total-return CAGR
17.53%
PRFZ ahead by 0.97 percentage points/year over 2023-09 through 2026-08. This is the observed difference between annualized compounded returns from adjusted prices, not an expected return or a factor-model estimate.
Historical factor attribution
Signed contribution to ESML minus PRFZ, percentage points/year, using fitted 36-month exposures and average factor returns over those same months:
Market factor
+0.38
Other factors, combined
+0.51
Total factor-implied difference
+0.90
This arithmetic-average factor attribution excludes the regression intercept and fund-specific return. It therefore need not equal the observed CAGR difference and is not a forecast.
Why This Pair Matches
Modeled factor tracking error · 36m
1.36%/yr
Modeled tracking error · 120m factor history
1.31%/yr
Mkt beta diff
0.02
Rel. Sharpe diff
0.119
Fitted exposures and factor covariance estimate the volatility, not the average or direction, of the funds' modeled return difference. The common regression window is 2023-09 through 2026-08. A short-window estimate and a longer factor-history check must both be at or below 3.000%; this is a screening limit, not a forecast. Holdings, turnover, taxes and trading costs require a separate review. The Sharpe figures elsewhere on this page come from each fund's published full-history model and do not enter similarity ranking. See the full methodology.
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