JOHNSON + JOHNSON and HENRY SCHEIN INC moved almost identically (+7.54% vs +7.34%), yet JNJ moved the XLV 72.7× 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 +16.64 pt move · cell size = points contributed · color = direction, intensity = return
MRK+1.8 pts(+21.8%)
TMO+1.4 pts(+25.3%)
JNJ+1.3 pts(+7.5%)
ABT+1.3 pts(+28.9%)
AMGN+1.1 pts(+22.1%)
MRNA+0.8 pts
PFE+0.7 pts(+20.7%)
GILD+0.7 pts(+17.8%)
LLY+0.7 pts
ABBV+0.7 pts(+6.3%)
BMY+0.7 pts(+19.2%)
REGN+0.6 pts(+33.7%)
MCK+0.5 pts(+19.8%)
MDT+0.5 pts(+16.5%)
DHR+0.4 pts(+13.4%)
VRTX+0.4 pts
BDX+0.3 pts(+25.5%)
IQV+0.3 pts(+34.3%)
VEEV+0.3 pts
COR+0.3 pts
BSX+0.3 pts
CVS
DXCM+0.3 pts
ISRG−0.3 pts
SYK
UNH−0.2 pts
RMD
HCA
ELV
A
LH
CI
GEHC
ZBH
Concentration curve
cumulative share of the +16.64 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−25%+25%+75%+125%
From −20.08% (DVA) to +126.80% (MRNA). Equal-weight, the XLV would be +14.78% vs the actual +10.49%; the gap is what cap weighting did.
By sector
point contribution · sums to +16.64 pts
-59
+16.7
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUG
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Health Care · Select Sector
What moved the market
QTD · AUG 25, 2026
+10.49%
+16.6 pts · closed 175.30
51 of 59 rose · 8 fell
MRK+21.8%
+1.8
TMO+25.3%
+1.4
JNJ+7.5%
+1.3
ABT+28.9%
+1.3
AMGN+22.1%
+1.1
ALGN−5.4%
−0.0
DVA−20.1%
−0.0
UNH−4.6%
−0.2
ISRG−6.5%
−0.3
CVS−9.7%
−0.3
Broad advance · MRK led at +1.79 ptsWMTMT.COM
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