AMGEN INC and SOLVENTUM CORP moved almost identically (+4.58% vs +4.79%), yet AMGN moved the XLV 15.3× 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 +5.57 pt move · cell size = points contributed · color = direction, intensity = return
MRK+1.4 pts(+15.7%)
MRNA+0.8 pts(+152.3%)
TMO+0.4 pts(+6.6%)
AMGN+0.3 pts(+4.6%)
ABBV+0.3 pts(+2.6%)
JNJ+0.3 pts(+0.7%)
DHR+0.2 pts(+8.2%)
ISRG−0.2 pts
PFE+0.2 pts(+4.8%)
GILD+0.2 pts(+3.7%)
UNH+0.2 pts
VRTX+0.2 pts(+4.7%)
MCK+0.2 pts(+4.1%)
ABT+0.2 pts
BMY
IQV+0.1 pts
COR
RMD
HCA
BDX
MDT
CVS
BSX
HUM
WAT
CRL
VTRS
ALGN
Concentration curve
cumulative share of the +5.57 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−25%+25%+75%+125%
From −4.94% (ISRG) to +152.27% (MRNA). Equal-weight, the XLV would be +5.31% vs the actual +3.28%; the gap is what cap weighting did.
By sector
point contribution · sums to +5.57 pts
-59
+5.6
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
1W · AUG 25, 2026
+3.28%
+5.6 pts · closed 175.30
46 of 59 rose · 13 fell
MRK+15.7%
+1.4
MRNA+152.3%
+0.8
TMO+6.6%
+0.4
AMGN+4.6%
+0.3
ABBV+2.6%
+0.3
COO−3.6%
−0.0
BSX−1.2%
−0.1
CVS−2.1%
−0.1
MDT−1.0%
−0.1
ISRG−4.9%
−0.2
Broad advance · MRK led at +1.42 ptsWMTMT.COM
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