ABBVIE INC and COOPER COS INC/THE moved almost identically (+3.41% vs +3.91%), yet ABBV moved the XLV 31.1× 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 +11.90 pt move · cell size = points contributed · color = direction, intensity = return
MRK+1.6 pts(+19.6%)
AMGN+0.9 pts(+18.2%)
MRNA+0.9 pts(+185.5%)
LLY+0.8 pts(+3.2%)
TMO+0.8 pts
ABT+0.6 pts(+11.1%)
PFE+0.6 pts(+15.8%)
GILD+0.6 pts(+14.0%)
JNJ+0.5 pts
VRTX+0.5 pts(+15.4%)
CVS−0.5 pts(−13.3%)
REGN+0.5 pts(+25.1%)
DHR+0.3 pts(+9.9%)
ABBV+0.3 pts
UNH−0.3 pts
BMY+0.3 pts
BDX+0.3 pts
MDT+0.2 pts(+8.2%)
MCK+0.2 pts
IQV+0.2 pts
VEEV+0.2 pts
HCA+0.2 pts
BSX
ELV
ISRG
GEHC
EW+0.1 pts
RMD+0.1 pts
COR
A
CRL
WAT
HUM
LH
CAH
BIIB
Concentration curve
cumulative share of the +11.90 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−25%+25%+75%+125%+175%
From −24.76% (DVA) to +185.51% (MRNA). Equal-weight, the XLV would be +11.17% vs the actual +7.28%; the gap is what cap weighting did.
By sector
point contribution · sums to +11.90 pts
-59
+11.9
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
1M · AUG 25, 2026
+7.28%
+11.9 pts · closed 175.30
50 of 59 rose · 9 fell
MRK+19.6%
+1.6
AMGN+18.2%
+0.9
MRNA+185.5%
+0.9
LLY+3.2%
+0.8
TMO+12.3%
+0.8
VTRS−4.5%
−0.0
PODD−13.3%
−0.0
DVA−24.8%
−0.0
UNH−5.0%
−0.3
CVS−13.3%
−0.5
Broad advance · MRK led at +1.64 ptsWMTMT.COM
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