NVIDIA CORP and F5 INC moved almost identically (−3.04% vs −2.76%), yet NVDA moved the XLK 74.6× 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 −3.84 pt move · cell size = points contributed · color = direction, intensity = return
NVDA−0.7 pts(−3.0%)
AVGO−0.6 pts(−6.1%)
INTC−0.5 pts(−9.5%)
MSFT+0.4 pts(+2.3%)
PANW−0.4 pts(−9.2%)
CRWD−0.4 pts(−12.9%)
AMAT−0.3 pts(−6.6%)
MRVL+0.3 pts(+11.3%)
SNDK−0.3 pts(−8.9%)
STX−0.2 pts(−9.1%)
LRCX−0.2 pts(−4.0%)
WDC−0.2 pts(−9.2%)
KLAC−0.2 pts
TXN
GLW−0.1 pts
ACN+0.1 pts
DDOG−0.1 pts
NOW+0.1 pts
CRM+0.1 pts
AMD−0.1 pts
TER−0.1 pts
DELL−0.1 pts
MU−0.1 pts
FLEX
KEYS
NTAP
HPE
ANET
FTNT
AAPL
CSCO
Concentration curve
cumulative share of the −3.84 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−15%−10%−5%0%+5%+10%
From −12.93% (CRWD) to +11.29% (MRVL). Equal-weight, the XLK would be −1.44% vs the actual −2.07%; the gap is what cap weighting did.
By sector
point contribution · sums to −3.84 pts
-73
−3.8
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
1W · AUG 25, 2026
−2.07%
−3.8 pts · closed 181.78
29 of 73 rose · 44 fell
MSFT+2.3%
+0.4
MRVL+11.3%
+0.3
ACN+8.1%
+0.1
NOW+6.3%
+0.1
CRM+4.9%
+0.1
CRWD−12.9%
−0.4
PANW−9.2%
−0.4
INTC−9.5%
−0.5
AVGO−6.1%
−0.6
NVDA−3.0%
−0.7
Mixed tape · top 3 drove 49% of the declineWMTMT.COM
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