CMCSA vs T: Correlation
Comcast (CMCSA) and AT&T (T) show a moderate relationship: their 3-year correlation of weekly returns is 0.31.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CMCSA and T?
Over the past 3 years, CMCSA and T moved with a correlation of 0.31, which is moderate. The past 12 months show a weaker link (0.18) than the 3-year average (0.31). Over 5 years the correlation is 0.32, and the annualized covariance of weekly returns is 163.9 %².
Among the 39 assets we track against CMCSA, T ranks #25 by 3-year correlation. Twelve-month performance is nearly a tie, at -12.6% for CMCSA and -8.4% for T. Across three years, the rolling one-year figure varied moderately, from 0.17 to 0.60.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
CMCSA vs T: side by side
| CMCSA (Comcast) | T (AT&T) | |
|---|---|---|
| 1-year return | -12.6% | -8.4% |
| 5-year return | -44.5% | +67.2% |
| Volatility (ann.) | 23.8% | 22.4% |
| Beta vs S&P 500 | 0.48 | 0.05 |
| Max drawdown (3Y) | -44.9% | -28.9% |
| Market cap | $93.7B | $174.3B |
| P/E (trailing) | 8.7 | 8.4 |
| Dividend yield | 4.85% | 4.29% |
| Sector / category | Communication Services | Communication Services |
Year-by-year returns
| Year | CMCSA | T |
|---|---|---|
| 2022 | -28.7% | +6.5% |
| 2023 | +29.1% | -2.7% |
| 2024 | -11.8% | +44.1% |
| 2025 | -17.3% | +14.0% |
| 2026 | -2.2% | +6.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CMCSA and T good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.31 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between CMCSA and T?
The CMCSA/T correlation stands at 0.31 on a 3-year window (1 year: 0.18, 5 years: 0.32), computed from weekly returns as of 2026-08-27.
Is T a good diversifier for CMCSA?
Yes, to a useful degree: a correlation of 0.31 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.31 mean?
A reading of 0.31 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
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Related comparisons
Hubs: CMCSA correlations · T correlations
