ECHOSTAR CORP A and REDDIT INC CL A moved almost identically (−18.68% vs −18.93%), yet ECHO moved the XLC 7.3× 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 +25.99 pt move · cell size = points contributed · color = direction, intensity = return
TTD−8.3 pts(−87.0%)
GOOGL+7.7 pts(+109.1%)
GOOG+6.2 pts(+104.8%)
WBD+4.9 pts(+271.9%)
CHTR−3.2 pts(−55.3%)
LYV+2.9 pts(+92.8%)
META−2.9 pts(+8.9%)
VZ+2.2 pts(+37.9%)
OMC+2.1 pts(−1.5%)
APP+2.1 pts
T+2.0 pts(+43.0%)
TKO+1.7 pts(+66.0%)
FOXA+1.6 pts(+79.2%)
TTWO+1.5 pts(+50.5%)
NFLX+1.1 pts
FOX+1.0 pts
ECHO−0.7 pts
CMCSA−0.6 pts
DIS
TMUS
Concentration curve
cumulative share of the +25.99 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−100%0%+100%+200%
From −87.03% (TTD) to +271.94% (WBD). Equal-weight, the XLC would be +41.69% vs the actual +29.81%; the gap is what cap weighting did.
By sector
point contribution · sums to +25.99 pts
-24
+22.2
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
2Y · AUG 25, 2026
+29.81%
+26.0 pts · closed 113.17
16 of 24 rose · 8 fell
GOOGL+109.1%
+7.7
GOOG+104.8%
+6.2
WBD+271.9%
+4.9
LYV+92.8%
+2.9
VZ+37.9%
+2.2
CMCSA−17.1%
−0.6
ECHO−18.7%
−0.7
META+8.9%
−2.9
CHTR−55.3%
−3.2
TTD−87.0%
−8.3
3 stocks drove 72% of the gain: GOOGL, GOOG, WBDWMTMT.COM
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