CMCSA vs TRT: Correlation
How closely do Comcast (CMCSA) and Trio-Tech International (TRT) trade together? Their weekly returns over three years give a correlation of -0.18, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CMCSA and TRT?
Across a 3-year window, the weekly returns of CMCSA and TRT correlate at -0.18, negative, meaning they tend to move in opposite directions. The relationship has been stable: the 1-year correlation (-0.27) sits close to the 3-year figure. Stretching to 5 years gives -0.11, with an annualized covariance of -469.5 %².
Within CMCSA's tracked universe of 39 assets, TRT comes in at #31 by 3-year correlation. Correlation aside, the last 12 months split them widely, with TRT ahead by 308.1 points (-12.6% versus +295.5%). Risk is not evenly split, since TRT carries 4.5 times the volatility of the other side.
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 TRT: side by side
| CMCSA (Comcast) | TRT (Trio-Tech International) | |
|---|---|---|
| 1-year return | -12.6% | +295.5% |
| 5-year return | -44.5% | +365.8% |
| Volatility (ann.) | 23.8% | 107.4% |
| Beta vs S&P 500 | 0.48 | 0.18 |
| Max drawdown (3Y) | -44.9% | -54.6% |
| Market cap | $93.7B | – |
| P/E (trailing) | 8.7 | 209.6 |
| Dividend yield | 4.85% | 0.00% |
| Sector / category | Communication Services | US Listed |
Year-by-year returns
| Year | CMCSA | TRT |
|---|---|---|
| 2022 | -28.7% | -66.5% |
| 2023 | +29.1% | +12.7% |
| 2024 | -11.8% | +14.6% |
| 2025 | -17.3% | +127.9% |
| 2026 | -2.2% | +58.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CMCSA and TRT good diversifiers for each other?
By historical standards, yes. A correlation of -0.18 means the two rarely move for the same reasons.
FAQ
What is the correlation between CMCSA and TRT?
The CMCSA/TRT correlation stands at -0.18 on a 3-year window (1 year: -0.27, 5 years: -0.11), computed from weekly returns as of 2026-08-27.
Is TRT a good diversifier for CMCSA?
By historical standards, yes. A correlation of -0.18 means the two rarely move for the same reasons.
What does a correlation of -0.18 mean?
On the −1 to +1 scale, -0.18 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/cmcsa-vs-trt.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/cmcsa-vs-trt/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: CMCSA correlations · TRT correlations
