JOHNSON + JOHNSON and QUEST DIAGNOSTICS INC moved almost identically (+86.38% vs +76.90%), yet JNJ moved the XLV 21.3× 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 +43.49 pt move · cell size = points contributed · color = direction, intensity = return
LLY+25.3 pts(+436.4%)
ABBV+9.3 pts(+202.6%)
JNJ+7.7 pts(+86.4%)
MRK+3.9 pts(+107.1%)
GILD+3.0 pts(+161.8%)
MRNA−2.9 pts(−34.0%)
AMGN+2.8 pts(+125.3%)
MCK+2.7 pts(+381.1%)
VRTX+2.1 pts(+182.8%)
DHR−1.8 pts
ZTS−1.7 pts
COR+1.4 pts
CAH+1.3 pts
ALGN
MDT
DXCM−1.1 pts
ILMN−1.0 pts
PFE
BMY
ABT
CI+0.8 pts
BAX−0.8 pts
HCA
REGN
CVS
ISRG
TECH
TMO
RVTY
Concentration curve
cumulative share of the +43.49 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−100%0%+100%+200%+300%+400%
From −78.44% (ALGN) to +436.35% (LLY). Equal-weight, the XLV would be +41.83% vs the actual +34.16%; the gap is what cap weighting did.
By sector
point contribution · sums to +43.49 pts
-60
+46.5
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
Share this move
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Health Care · Select Sector
What moved the market
5Y · OCT 9, 2026
+34.16%
+43.5 pts · closed 170.82
38 of 60 rose · 22 fell
LLY+436.4%
+25.3
ABBV+202.6%
+9.3
JNJ+86.4%
+7.7
MRK+107.1%
+3.9
GILD+161.8%
+3.0
MDT−19.1%
−1.1
ALGN−78.4%
−1.3
ZTS−60.0%
−1.7
DHR−15.7%
−1.8
MRNA−34.0%
−2.9
3 stocks drove 97% of the gain: LLY, ABBV, JNJWMTMT.COM
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