BALL CORP and PPG INDUSTRIES INC moved almost identically (−5.78% vs −5.16%), yet BALL moved the XLB 8.6× 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 −2.54 pt move · cell size = points contributed · color = direction, intensity = return
CRH−0.9 pts(−30.5%)
MLM−0.8 pts(−24.2%)
ALB−0.8 pts(−41.5%)
NUE+0.8 pts(+34.8%)
DOW−0.7 pts(−26.4%)
STLD+0.7 pts(+25.4%)
FCX+0.6 pts(+8.9%)
VMC−0.6 pts(−17.1%)
NEM+0.5 pts(−2.3%)
LYB−0.4 pts(−17.3%)
IFF+0.4 pts
LIN−0.3 pts(−3.6%)
CF−0.2 pts
MOS−0.2 pts
IP−0.2 pts
PKG+0.2 pts
SW−0.1 pts
BALL−0.1 pts
SHW
AMCR
Concentration curve
cumulative share of the −2.54 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−50%−30%−10%+10%+30%
From −41.53% (ALB) to +34.83% (NUE). Equal-weight, the XLB would be −4.44% vs the actual −4.89%; the gap is what cap weighting did.
By sector
point contribution · sums to −2.54 pts
-24
−2.2
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
Share this move
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Materials · Select Sector
What moved the market
6M · OCT 9, 2026
−4.89%
−2.5 pts · closed 49.42
7 of 24 rose · 17 fell
NUE+34.8%
+0.8
STLD+25.4%
+0.7
FCX+8.9%
+0.6
NEM−2.3%
+0.5
IFF+17.2%
+0.4
VMC−17.1%
−0.6
DOW−26.4%
−0.7
ALB−41.5%
−0.8
MLM−24.2%
−0.8
CRH−30.5%
−0.9
3 stocks drove 100% of the decline: CRH, MLM, ALBWMTMT.COM
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