VISTRA CORP and AES CORP moved almost identically (+4.46% vs +5.00%), yet VST moved the XLU 14.2× 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 −5.56 pt move · cell size = points contributed · color = direction, intensity = return
NEE−1.3 pts(−17.2%)
CEG+0.5 pts(+4.2%)
PCG−0.4 pts(−29.0%)
DUK−0.4 pts(−10.4%)
SO−0.4 pts(−9.9%)
NRG−0.4 pts(−34.0%)
SRE−0.4 pts(−16.8%)
EIX−0.2 pts(−27.0%)
VST+0.2 pts(+4.5%)
AEP−0.2 pts(−9.2%)
EXC−0.2 pts
ETR−0.2 pts
XEL−0.2 pts
ATO−0.2 pts(−14.6%)
DTE−0.2 pts(−14.2%)
PEG−0.2 pts
CMS−0.1 pts
WEC−0.1 pts
PPL−0.1 pts(−12.9%)
ED−0.1 pts
NI
CNP
AEE−0.1 pts
FE−0.1 pts
D−0.1 pts
LNT−0.1 pts
ES
AWK
PNW
EVRG
Concentration curve
cumulative share of the −5.56 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−35%−25%−15%−5%
From −33.98% (NRG) to +5.00% (AES). Equal-weight, the XLU would be −10.35% vs the actual −11.85%; the gap is what cap weighting did.
By sector
point contribution · sums to −5.56 pts
-31
−5.3
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
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Utilities · Select Sector
What moved the market
6M · OCT 9, 2026
−11.85%
−5.6 pts · closed 41.40
3 of 31 rose · 28 fell
CEG+4.2%
+0.5
VST+4.5%
+0.2
AES+5.0%
+0.0
NRG−34.0%
−0.4
SO−9.9%
−0.4
DUK−10.4%
−0.4
PCG−29.0%
−0.4
NEE−17.2%
−1.3
Broad selloff · NEE led at −1.25 ptsWMTMT.COM
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