SOUTHERN CO/THE and AES CORP moved almost identically (+5.68% vs +5.16%), yet SO moved the XLU 13.8× as much. In a cap-weighted index, the bigger company's weight turns the same percentage move into far more points.
Attribution map
slicing the +0.61 pt move · cell size = points contributed · color = direction, intensity = return
CEG−0.5 pts(−21.0%)
NRG−0.3 pts(−28.2%)
D+0.3 pts(+16.6%)
EIX+0.2 pts(+28.0%)
NEE+0.2 pts(+6.4%)
ETR+0.2 pts(+17.0%)
SO+0.2 pts(+5.7%)
VST−0.2 pts
PCG+0.2 pts(+14.9%)
DUK+0.1 pts(+5.9%)
AEP+0.1 pts(+8.1%)
ED+0.1 pts(+9.6%)
XEL+0.1 pts(+6.1%)
SRE−0.1 pts
EVRG+0.1 pts
AEE+0.1 pts
PEG−0.1 pts
AWK+0.1 pts
FE+0.1 pts
DTE
EXC+0.0 pts
PNW
ES
LNT
WEC
Concentration curve
cumulative share of the +0.61 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−30%−20%−10%0%+10%+20%
From −28.21% (NRG) to +27.99% (EIX). Equal-weight, the XLU would be +4.89% vs the actual +1.43%; the gap is what cap weighting did.
By sector
point contribution · sums to +0.61 pts
-31
+0.9
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUG
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Utilities · Select Sector
What moved the market
YTD · AUG 25, 2026
+1.43%
+0.6 pts · closed 43.30
25 of 31 rose · 6 fell
D+16.6%
+0.3
EIX+28.0%
+0.2
NEE+6.4%
+0.2
ETR+17.0%
+0.2
SO+5.7%
+0.2
PEG−7.2%
−0.1
SRE−3.1%
−0.1
VST−13.5%
−0.2
NRG−28.2%
−0.3
CEG−21.0%
−0.5
3 stocks drove 100%+ of the gain: D, EIX, NEEWMTMT.COM
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