AMAZON.COM INC and BEST BUY CO INC moved almost identically (+6.11% vs +6.56%), yet AMZN moved the XLY 38.7× 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 −3.18 pt move · cell size = points contributed · color = direction, intensity = return
AMZN+2.2 pts(+6.1%)
TSLA−1.1 pts(−3.1%)
HD−1.0 pts(−13.8%)
MCD−0.8 pts(−13.7%)
SBUX−0.6 pts(−15.0%)
TJX−0.5 pts(−7.5%)
LOW−0.4 pts
BKNG−0.4 pts(−8.8%)
NKE−0.4 pts
ABNB+0.3 pts
GM+0.2 pts(+7.9%)
F
DASH
ULTA
TPR−0.1 pts
DHI
MGM−0.1 pts
YUM
WSM
LULU
APTV
CMG
HLT
RCL
NCLH
AZO
BBY
WYNN
LEN
CCL
EXPE
Concentration curve
cumulative share of the −3.18 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−40%−20%0%+20%
From −38.04% (MGM) to +20.50% (ULTA). Equal-weight, the XLY would be −4.84% vs the actual −2.74%; the gap is what cap weighting did.
By sector
point contribution · sums to −3.18 pts
-47
−3.2
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
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Consumer Discretionary · Select Sector
What moved the market
3M · OCT 9, 2026
−2.74%
−3.2 pts · closed 112.86
16 of 47 rose · 31 fell
AMZN+6.1%
+2.2
ABNB+13.4%
+0.3
GM+7.9%
+0.2
DASH+3.7%
+0.1
ULTA+20.5%
+0.1
TJX−7.5%
−0.5
SBUX−15.0%
−0.6
MCD−13.7%
−0.8
HD−13.8%
−1.0
TSLA−3.1%
−1.1
3 stocks drove 89% of the decline: TSLA, HD, MCDWMTMT.COM
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