NVIDIA CORP and VERISIGN INC moved almost identically (+8.42% vs +7.21%), yet NVDA moved the XLK 202.9× 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 +7.48 pt move · cell size = points contributed · color = direction, intensity = return
MSFT+3.4 pts(+26.6%)
NVDA+2.0 pts(+8.4%)
AAPL−1.9 pts(−7.9%)
PLTR+1.1 pts(+31.3%)
AVGO−0.7 pts
MRVL+0.6 pts(+27.1%)
SNDK+0.5 pts(+15.8%)
MU+0.5 pts(+3.6%)
LRCX+0.5 pts(+7.9%)
ORCL+0.4 pts(+20.7%)
AMD−0.3 pts
ANET+0.3 pts
CRM+0.3 pts
KLAC−0.3 pts
NOW
ACN
INTC−0.2 pts
AMAT−0.2 pts
IBM
LITE
TXN
APH
INTU
CSCO
PANW
ADBE
NXPI
MSI
WDAY
GLW
COHR
ON
Concentration curve
cumulative share of the +7.48 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−20%−10%0%+10%+20%+30%
From −18.56% (ON) to +36.26% (ZBRA). Equal-weight, the XLK would be +7.24% vs the actual +4.29%; the gap is what cap weighting did.
By sector
point contribution · sums to +7.48 pts
-73
+7.5
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUG
Share this move
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Technology · Select Sector
What moved the market
1M · AUG 25, 2026
+4.29%
+7.5 pts · closed 181.78
49 of 73 rose · 24 fell
MSFT+26.6%
+3.4
NVDA+8.4%
+2.0
PLTR+31.3%
+1.1
MRVL+27.1%
+0.6
SNDK+15.8%
+0.5
INTC−4.6%
−0.2
KLAC−9.7%
−0.3
AMD−3.2%
−0.3
AVGO−6.9%
−0.7
AAPL−7.9%
−1.9
3 stocks drove 88% of the gain: MSFT, NVDA, PLTRWMTMT.COM
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