PFIZER INC and DAVITA INC moved almost identically (+11.41% vs +11.53%), yet PFE moved the XLV 53.3× 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 +19.18 pt move · cell size = points contributed · color = direction, intensity = return
JNJ+7.6 pts(+71.3%)
LLY+7.4 pts(+34.5%)
UNH−6.6 pts(−33.1%)
ABBV+4.0 pts(+50.9%)
GILD+2.6 pts(+87.6%)
MRK+1.9 pts(+40.8%)
BSX−1.7 pts(−49.4%)
MCK+1.5 pts(+94.8%)
MRNA+1.3 pts
AMGN
ZTS−1.2 pts(−59.7%)
DHR−1.0 pts(−17.6%)
BMY+0.8 pts
ELV−0.8 pts
CAH+0.8 pts
CVS
SYK−0.7 pts
REGN−0.7 pts
CI
HUM
ILMN
PFE
ISRG−0.5 pts
VEEV+0.5 pts
TMO
VRTX
EW+0.4 pts
GEHC
CNC
DXCM
COO
Concentration curve
cumulative share of the +19.18 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−100%0%+100%+200%
From −59.69% (ZTS) to +273.75% (MRNA). Equal-weight, the XLV would be +25.06% vs the actual +12.65%; the gap is what cap weighting did.
By sector
point contribution · sums to +19.18 pts
-60
+21.1
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
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Health Care · Select Sector
What moved the market
2Y · OCT 9, 2026
+12.65%
+19.2 pts · closed 170.82
39 of 60 rose · 21 fell
JNJ+71.3%
+7.6
LLY+34.5%
+7.4
ABBV+50.9%
+4.0
GILD+87.6%
+2.6
MRK+40.8%
+1.9
ELV−13.2%
−0.8
DHR−17.6%
−1.0
ZTS−59.7%
−1.2
BSX−49.4%
−1.7
UNH−33.1%
−6.6
3 stocks drove 99% of the gain: JNJ, LLY, ABBVWMTMT.COM
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