How much did CMCSA move each index today?
S&P 500: CMCSA moved +0.04% and contributed +0.0 points of the index's +6.6-point move (0% of it), ranking #283 of 503 members by contribution to the move.
NASDAQ 100: CMCSA moved +0.04% and contributed +0.0 points against the index's −17.7-point move, offsetting 0% of it, ranking #54 of 102 members by contribution to the move.
XLC: CMCSA moved +0.04% and contributed +0.00 points against the index's −0.20-point move, offsetting 1% of it, ranking #16 of 24 members by contribution to the move.
CMCSA closed the 2026-08-25 session at 27.10; that day's move sits in the 56th percentile of its own past year. The stock is 20.6% below its 52-week closing high and +6.2% for the year so far.
CMCSA in the S&P 500 beyond today
| window | CMCSA return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | +3.44% | +0.4 pts | −14.5 pts | #439 of 503 |
| 1 month | +18.86% | +1.7 pts | +264.1 pts | #51 of 503 |
| quarter to date | +11.92% | +1.0 pts | +177.9 pts | #99 of 503 |
| year to date | +6.18% | +0.7 pts | +831.8 pts | #179 of 503 |
Who moved with and against CMCSA today?
On CMCSA's side of the S&P 500 tape: AAPL (+4.3 pts), MSFT (+2.8 pts), AMD (+1.7 pts). Pulling the other way: LLY (−2.6 pts), GOOGL (−2.4 pts), NVDA (−2.3 pts).
Every member's contribution, top to bottom, is on the index dashboards; the day's story is in the market-close note. Machine-readable figures for this stock: /api/stock/CMCSA, free to cite with attribution.