VISA INC CLASS A SHARES and FACTSET RESEARCH SYSTEMS INC moved almost identically (+6.87% vs +7.91%), yet V moved the XLF 30.0× 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 +1.24 pt move · cell size = points contributed · color = direction, intensity = return
V+0.3 pts(+6.9%)
MA+0.2 pts(+6.7%)
BRK-B+0.2 pts(+2.5%)
WFC+0.1 pts(+3.9%)
SPGI+0.0 pts(+5.6%)
CME+0.0 pts(+6.6%)
JPM+0.0 pts(+0.7%)
PGR+0.0 pts(+3.4%)
CB+0.0 pts(+3.1%)
BAC+0.0 pts
CBOE+0.0 pts
MCO
ICE+0.0 pts
BLK+0.0 pts
HOOD−0.0 pts
AXP+0.0 pts
COF
MRSH+0.0 pts
PYPL+0.0 pts
APO
GS
MSCI
BNY
BX
C
XYZ
NDAQ
ALL
AFL
AIG
BRO
FIS
WTW
FISV
ACGL
NTRS
Concentration curve
cumulative share of the +1.24 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−5%0%+5%+10%
From −4.22% (PFG) to +12.44% (CBOE). Equal-weight, the XLF would be +1.85% vs the actual +2.32%; the gap is what cap weighting did.
By sector
point contribution · sums to +1.24 pts
-76
+1.2
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
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Financials · Select Sector
What moved the market
1W · OCT 9, 2026
+2.32%
+1.2 pts · closed 54.73
54 of 76 rose · 22 fell
V+6.9%
+0.3
MA+6.7%
+0.2
BRK-B+2.5%
+0.2
WFC+3.9%
+0.1
SPGI+5.6%
+0.0
USB−0.8%
−0.0
PFG−4.2%
−0.0
BNY−1.8%
−0.0
GS−0.8%
−0.0
HOOD−3.3%
−0.0
3 stocks drove 55% of the gain: V, MA, BRK-BWMTMT.COM
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