SOUTHERN CO/THE and NISOURCE INC moved almost identically (−1.82% vs −1.57%), yet SO moved the XLU 5.3× 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 −1.13 pt move · cell size = points contributed · color = direction, intensity = return
NEE−0.4 pts(−6.1%)
CEG+0.3 pts(+4.2%)
VST+0.2 pts(+9.9%)
D−0.1 pts(−5.2%)
DUK−0.1 pts(−2.3%)
AWK−0.1 pts
PCG−0.1 pts(−6.1%)
SO−0.1 pts(−1.8%)
EXC−0.1 pts
DTE−0.1 pts(−4.7%)
ETR−0.1 pts(−2.8%)
SRE−0.0 pts
ED
XEL−0.0 pts(−1.4%)
ATO−0.0 pts(−1.9%)
CMS−0.0 pts
AEE−0.0 pts
ES
FE
NRG−0.0 pts
LNT
CNP
PEG−0.0 pts
EIX
NI
PPL
EVRG
Concentration curve
cumulative share of the −1.13 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−8%−4%0%+4%+8%
From −7.86% (AWK) to +9.94% (VST). Equal-weight, the XLU would be −1.67% vs the actual −2.65%; the gap is what cap weighting did.
By sector
point contribution · sums to −1.13 pts
-31
−1.1
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
Share this move
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Utilities · Select Sector
What moved the market
1M · OCT 9, 2026
−2.65%
−1.1 pts · closed 41.40
5 of 31 rose · 26 fell
CEG+4.2%
+0.3
VST+9.9%
+0.2
AES+0.8%
+0.0
PNW+2.4%
+0.0
PCG−6.1%
−0.1
AWK−7.9%
−0.1
DUK−2.3%
−0.1
D−5.2%
−0.1
NEE−6.1%
−0.4
3 stocks drove 62% of the decline: NEE, D, DUKWMTMT.COM
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