ALPHABET INC CL A and TRADE DESK INC/THE CLASS A moved almost identically (−1.85% vs −1.77%), yet GOOGL moved the XLC 10.7× 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 −0.65 pt move · cell size = points contributed · color = direction, intensity = return
META+0.2 pts(+1.3%)
GOOGL−0.2 pts(−1.9%)
GOOG−0.2 pts(−1.7%)
LYV−0.1 pts(−1.5%)
DIS−0.1 pts(−1.3%)
ECHO−0.1 pts(−2.5%)
OMC−0.1 pts(−1.1%)
NFLX−0.1 pts
CHTR−0.0 pts(−1.3%)
TKO−0.0 pts(−1.6%)
FOXA−0.0 pts(−1.1%)
FOX
T+0.0 pts(+0.4%)
TMUS−0.0 pts(−0.4%)
TTD−0.0 pts
VZ+0.0 pts
TTWO+0.0 pts
RDDT−0.0 pts
APP
PSKY
CMCSA
Concentration curve
cumulative share of the −0.65 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−4%−3%−2%−1%0%+1%
From −3.87% (RDDT) to +1.27% (META). Equal-weight, the XLC would be −0.93% vs the actual −0.57%; the gap is what cap weighting did.
By sector
point contribution · sums to −0.65 pts
-24
−0.6
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUG
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Communication Services · Select Sector
What moved the market
1D LIVE · AUG 26, 2026
−0.57%
−0.6 pts · now 112.52
4 of 24 rose · 20 fell
META+1.3%
+0.2
T+0.4%
+0.0
VZ+0.3%
+0.0
TTWO+0.3%
+0.0
ECHO−2.5%
−0.1
DIS−1.3%
−0.1
LYV−1.5%
−0.1
GOOG−1.7%
−0.2
GOOGL−1.9%
−0.2
3 stocks drove 71% of the decline: GOOGL, GOOG, LYVWMTMT.COM
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