T MOBILE US INC and PARAMOUNT SKYDANCE CL B moved almost identically (+8.28% vs +8.22%), yet TMUS moved the XLC 63.5× 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 +6.04 pt move · cell size = points contributed · color = direction, intensity = return
T+1.3 pts(+26.1%)
VZ+0.9 pts(+20.6%)
META+0.9 pts(+1.2%)
APP−0.9 pts(−39.7%)
OMC+0.8 pts(+21.1%)
TMUS+0.6 pts(+8.3%)
FOXA+0.6 pts(+34.8%)
ECHO−0.5 pts
CMCSA+0.5 pts(+11.9%)
DIS+0.5 pts(+15.6%)
TTWO−0.4 pts(−6.8%)
NWSA+0.4 pts
FOX+0.4 pts
NFLX+0.4 pts(+15.2%)
TTD−0.4 pts(−26.7%)
GOOGL+0.3 pts(−2.9%)
GOOG+0.2 pts
NWS
CHTR+0.1 pts
RDDT
Concentration curve
cumulative share of the +6.04 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−40%−20%0%+20%
From −39.73% (APP) to +34.84% (FOXA). Equal-weight, the XLC would be +5.84% vs the actual +5.64%; the gap is what cap weighting did.
By sector
point contribution · sums to +6.04 pts
-24
+5.7
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
QTD · AUG 25, 2026
+5.64%
+6.0 pts · closed 113.17
16 of 24 rose · 8 fell
T+26.1%
+1.3
VZ+20.6%
+0.9
META+1.2%
+0.9
OMC+21.1%
+0.8
TMUS+8.3%
+0.6
TKO−3.9%
−0.1
TTD−26.7%
−0.4
TTWO−6.8%
−0.4
ECHO−14.8%
−0.5
APP−39.7%
−0.9
Mixed tape · top 3 drove 53% of the gainWMTMT.COM
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