PPG INDUSTRIES INC and NUCOR CORP moved almost identically (+3.79% vs +3.26%), yet PPG moved the XLB 8.0× 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 +2.59 pt move · cell size = points contributed · color = direction, intensity = return
NEM+0.8 pts(+21.4%)
FCX+0.7 pts(+24.1%)
SW+0.4 pts
ALB−0.4 pts(−23.6%)
IP+0.4 pts(+28.2%)
SHW+0.3 pts(+12.6%)
AMCR+0.3 pts(+23.3%)
ECL+0.3 pts(+14.2%)
STLD−0.3 pts
LIN−0.2 pts(−5.1%)
APD+0.2 pts(+5.5%)
IFF+0.2 pts
DOW−0.2 pts
CRH−0.2 pts(−5.8%)
PKG+0.2 pts(+13.6%)
MLM−0.2 pts(−5.1%)
BALL+0.1 pts(+13.7%)
AVY+0.1 pts(+13.3%)
CTVA+0.1 pts
LYB
PPG
MOS
CF
Concentration curve
cumulative share of the +2.59 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 −23.58% (ALB) to +28.21% (IP). Equal-weight, the XLB would be +7.33% vs the actual +5.09%; the gap is what cap weighting did.
By sector
point contribution · sums to +2.59 pts
-25
+2.8
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUG
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Materials · Select Sector
What moved the market
3M · AUG 25, 2026
+5.09%
+2.6 pts · closed 53.59
18 of 25 rose · 7 fell
NEM+21.4%
+0.8
FCX+24.1%
+0.7
SW+26.1%
+0.4
IP+28.2%
+0.4
SHW+12.6%
+0.3
CRH−5.8%
−0.2
DOW−13.6%
−0.2
LIN−5.1%
−0.2
STLD−7.5%
−0.3
ALB−23.6%
−0.4
3 stocks drove 72% of the gain: NEM, FCX, SWWMTMT.COM
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