CMCSA vs TMUS: Correlation
How closely do Comcast (CMCSA) and T-Mobile US (TMUS) trade together? Their weekly returns over three years give a correlation of 0.29, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CMCSA and TMUS?
Across a 3-year window, the weekly returns of CMCSA and TMUS correlate at 0.29, weak. Lately the two have moved closer together, with the 1-year correlation at 0.39 versus 0.29 over 3 years. Stretching to 5 years gives 0.28, with an annualized covariance of 171.0 %².
By 3-year correlation, TMUS places #27 of the 39 assets tracked against CMCSA. Correlation aside, the last 12 months split them widely, with CMCSA ahead by 15.4 points (-12.6% versus -28.0%). On a rolling one-year basis the correlation drifted between 0.10 and 0.40, a moderate band.
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 TMUS: side by side
| CMCSA (Comcast) | TMUS (T-Mobile US) | |
|---|---|---|
| 1-year return | -12.6% | -28.0% |
| 5-year return | -44.5% | +34.8% |
| Volatility (ann.) | 23.8% | 24.6% |
| Beta vs S&P 500 | 0.48 | 0.36 |
| Max drawdown (3Y) | -44.9% | -37.1% |
| Market cap | $93.7B | $190.7B |
| P/E (trailing) | 8.7 | 18.8 |
| Dividend yield | 4.85% | 2.27% |
| Sector / category | Communication Services | Communication Services |
Year-by-year returns
| Year | CMCSA | TMUS |
|---|---|---|
| 2022 | -28.7% | +20.7% |
| 2023 | +29.1% | +15.0% |
| 2024 | -11.8% | +39.7% |
| 2025 | -17.3% | -6.6% |
| 2026 | -2.2% | -11.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CMCSA and TMUS good diversifiers for each other?
Reasonably. At 0.29, CMCSA and TMUS keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between CMCSA and TMUS?
As of 2026-08-27, the correlation of weekly returns between CMCSA and TMUS is 0.29 over 3 years, 0.39 over 1 year and 0.28 over 5 years.
Is TMUS a good diversifier for CMCSA?
Reasonably. At 0.29, CMCSA and TMUS keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.29 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/cmcsa-vs-tmus.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/cmcsa-vs-tmus/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: CMCSA correlations · TMUS correlations
