NVIDIA CORP and MICROCHIP TECHNOLOGY INC moved almost identically (+14.37% vs +16.60%), yet NVDA moved the XLK 86.4× 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 +37.81 pt move · cell size = points contributed · color = direction, intensity = return
MU+5.2 pts(+227.0%)
NVDA+4.2 pts(+14.4%)
AMD+4.1 pts(+123.7%)
AAPL+2.7 pts(+14.2%)
MSFT+2.4 pts
AMAT+2.3 pts(+87.3%)
SNDK+2.2 pts(+523.8%)
LRCX+1.9 pts(+84.2%)
INTC+1.6 pts
STX+1.6 pts
CSCO+1.5 pts(+45.8%)
PANW+1.5 pts(+84.5%)
MRVL+1.5 pts(+183.2%)
WDC+1.2 pts
DELL+1.1 pts
ORCL−1.0 pts
KLAC+1.0 pts(+51.3%)
TXN+0.9 pts(+51.6%)
CRWD+0.9 pts(+58.2%)
INTU−0.9 pts
IBM−0.8 pts
ANET
ACN−0.7 pts
CRM−0.6 pts
FTNT
ADI+0.5 pts
HPE
ADBE
TER
LITE
DDOG
MPWR
APH
MSI
SNPS
Concentration curve
cumulative share of the +37.81 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−100%+100%+300%+500%
From −45.76% (INTU) to +523.80% (SNDK). Equal-weight, the XLK would be +44.12% vs the actual +26.26%; the gap is what cap weighting did.
By sector
point contribution · sums to +37.81 pts
-73
+37.6
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUG
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Technology · Select Sector
What moved the market
YTD · AUG 25, 2026
+26.26%
+37.8 pts · closed 181.78
51 of 73 rose · 22 fell
MU+227.0%
+5.2
NVDA+14.4%
+4.2
AMD+123.7%
+4.1
AAPL+14.2%
+2.7
MSFT+2.1%
+2.4
CRM−21.9%
−0.6
ACN−29.3%
−0.7
IBM−19.9%
−0.8
INTU−45.8%
−0.9
ORCL−24.9%
−1.0
Mixed tape · top 3 drove 36% of the gainWMTMT.COM
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