ELI LILLY + CO and HENRY SCHEIN INC moved almost identically (+31.49% vs +29.93%), yet LLY moved the XLV 165.6× 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 +20.88 pt move · cell size = points contributed · color = direction, intensity = return
JNJ+8.1 pts(+80.5%)
LLY+6.4 pts(+31.5%)
UNH−5.0 pts(−28.5%)
ABBV+3.3 pts(+43.7%)
GILD+2.7 pts(+110.8%)
MRK+2.4 pts(+45.2%)
AMGN+1.5 pts(+42.1%)
BMY+1.5 pts(+52.2%)
CVS+1.3 pts(+69.0%)
BSX−1.3 pts
ELV−1.2 pts
MCK+1.2 pts
ZTS−1.1 pts(−56.9%)
REGN−1.0 pts
DHR−1.0 pts
ISRG−0.9 pts
CAH
ABT+0.8 pts
MRNA+0.6 pts
CI
MDT
COR+0.5 pts
EW
VRTX
DGX
DXCM
LH
Concentration curve
cumulative share of the +20.88 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−75%−25%+25%+75%
From −56.88% (ZTS) to +124.25% (CAH). Equal-weight, the XLV would be +25.05% vs the actual +13.52%; the gap is what cap weighting did.
By sector
point contribution · sums to +20.88 pts
-59
+22.5
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
2Y · AUG 25, 2026
+13.52%
+20.9 pts · closed 175.30
41 of 59 rose · 18 fell
JNJ+80.5%
+8.1
LLY+31.5%
+6.4
ABBV+43.7%
+3.3
GILD+110.8%
+2.7
MRK+45.2%
+2.4
REGN−29.5%
−1.0
ZTS−56.9%
−1.1
ELV−23.8%
−1.2
BSX−36.5%
−1.3
UNH−28.5%
−5.0
3 stocks drove 85% of the gain: JNJ, LLY, ABBVWMTMT.COM
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