CMCSA vs. T
CMCSA (Comcast Corporation) and T (AT&T Inc.) are both stocks. Both are in the Communication Services sector — CMCSA in Entertainment, T in Telecom Services. Over the past 10 years, CMCSA returned 0.48%/yr vs 2.52%/yr for T. Their 0.33 correlation means their historical movements had little consistent relationship.
Performance
CMCSA vs. T - Performance Comparison
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Returns By Period
In the year-to-date period, CMCSA achieves a -6.11% return, which is significantly lower than T's -3.04% return. Over the past 10 years, CMCSA has underperformed T with an annualized return of 0.48%, while T has yielded a comparatively higher 2.52% annualized return.
CMCSA
- 1D
- 1.23%
- 1M
- 0.71%
- 6M
- -17.42%
- YTD
- -6.11%
- 1Y
- -12.79%
- 3Y*
- -12.65%
- 5Y*
- -11.56%
- 10Y*
- 0.48%
- ALL TIME*
- 9.78%
T
- 1D
- 0.17%
- 1M
- 14.48%
- 6M
- -9.17%
- YTD
- -3.04%
- 1Y
- -12.27%
- 3Y*
- 23.94%
- 5Y*
- 7.92%
- 10Y*
- 2.52%
- ALL TIME*
- 9.45%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
CMCSA Comcast Corporation | $874.68M | $810.14M | $870.96M |
| $2.13B | $1.85B | $1.42B |
CMCSA vs. T - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
CMCSA Comcast Corporation | -6.11% | -17.35% | -11.84% | 29.08% | -28.68% | -2.22% | 19.13% | 34.04% | -12.71% | 17.45% |
T AT&T Inc. | -3.04% | 13.97% | 44.08% | -2.74% | 5.76% | -8.09% | -21.37% | 45.55% | -22.25% | -4.01% |
Correlation
The correlation between CMCSA and T is 0.36, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.36 |
Correlation (3Y) Balances recent behavior with more history. | 0.34 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.41 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.42 |
Correlation (All Time) Calculated using the full available price history since Jul 7, 1988 | 0.33 |
Fundamentals
CMCSA:
$85.03B
T:
$159.44B
CMCSA:
$3.08
T:
$3.03
CMCSA:
7.78
T:
7.67
CMCSA:
0.17
T:
0.32
CMCSA:
0.70
T:
1.29
CMCSA:
0.95
T:
1.28
CMCSA:
$124.91B
T:
$127.24B
CMCSA:
$86.67B
T:
$112.60B
CMCSA:
$33.63B
T:
$49.53B
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Return for Risk
CMCSA vs. T — Risk / Return Rank
CMCSA
T
CMCSA vs. T - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Comcast Corporation (CMCSA) and AT&T Inc. (T). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| CMCSA | T | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.02 | ||
| Sortino ratioReturn per unit of downside risk | +0.03 | ||
| Omega ratioGain probability vs. loss probability | 0.94 | 0.94 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | -0.48 | -0.39 | -0.09 |
| Martin ratioReturn relative to average drawdown | -0.94 | -0.84 | -0.11 |
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Drawdowns
CMCSA vs. T - Drawdown Comparison
The maximum CMCSA drawdown since its inception was -67.89%, which is greater than T's maximum drawdown of -64.15%. Use the drawdown chart below to compare losses from any high point for CMCSA and T.
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Drawdown Indicators
| CMCSA | T | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -67.89% | -64.15% | -3.74% |
Max Drawdown (1Y)Largest decline over 1 year | -30.80% | -28.89% | -1.91% |
Max Drawdown (3Y)Largest decline over 3 years | -41.66% | -28.89% | -12.77% |
Max Drawdown (5Y)Largest decline over 5 years | -52.83% | -32.01% | -20.82% |
Max Drawdown (10Y)Largest decline over 10 years | -52.83% | -42.35% | -10.48% |
Current DrawdownCurrent decline from peak | -48.44% | -18.19% | -30.25% |
Average DrawdownAverage peak-to-trough decline | -24.71% | -15.74% | -8.97% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 15.55% | 13.37% | +2.18% |
Volatility
CMCSA vs. T - Volatility Comparison
Comcast Corporation (CMCSA) has a higher volatility of 12.24% compared to AT&T Inc. (T) at 8.75%. This indicates that CMCSA's price experiences larger fluctuations and is considered to be riskier than T based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| CMCSA | T | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 12.24% | 8.75% | +3.49% |
Volatility (6M)Calculated over the trailing 6-month period | 25.68% | 20.28% | +5.40% |
Volatility (1Y)Calculated over the trailing 1-year period | 31.44% | 24.78% | +6.66% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 27.58% | 24.61% | +2.97% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 26.83% | 24.02% | +2.81% |
Dividends
CMCSA vs. T - Dividend Comparison
CMCSA's dividend yield for the trailing twelve months is around 12.20%, more than T's 4.77% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
CMCSA Comcast Corporation | 12.20% | 4.35% | 3.25% | 2.60% | 3.03% | 1.95% | 1.72% | 1.40% | 2.69% | 1.18% | 1.96% | 1.73% |
T AT&T Inc. | 4.77% | 4.47% | 4.87% | 6.62% | 6.66% | 8.46% | 7.23% | 5.22% | 7.01% | 5.04% | 4.51% | 5.46% |
Financials
CMCSA vs. T - Financials Comparison
This section allows you to compare key financial metrics between Comcast Corporation and AT&T Inc.. You can select fields from income statements, balance sheets, and cash flow statements to easily visualize and compare the financial health of both companies.
Total Revenue: Total amount of money received from sales and other business activities
CMCSA vs. T - Profitability Comparison
CMCSA - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Aug 2026, Comcast Corporation reported a gross profit of 21.55B and revenue of 29.94B. Therefore, the gross margin over that period was 72.0%.
T - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Aug 2026, AT&T Inc. reported a gross profit of 25.25B and revenue of 31.56B. Therefore, the gross margin over that period was 80.0%.
CMCSA - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Aug 2026, Comcast Corporation reported an operating income of 5.16B and revenue of 29.94B, resulting in an operating margin of 17.2%.
T - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Aug 2026, AT&T Inc. reported an operating income of 7.04B and revenue of 31.56B, resulting in an operating margin of 22.3%.
CMCSA - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Aug 2026, Comcast Corporation reported a net income of 3.53B and revenue of 29.94B, resulting in a net margin of 11.8%.
T - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Aug 2026, AT&T Inc. reported a net income of 4.59B and revenue of 31.56B, resulting in a net margin of 14.6%.
Frequently Asked Questions
CMCSA and T have a correlation of 0.36, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
CMCSA has higher volatility (12.24%) compared to T (8.75%). In terms of maximum drawdown, CMCSA dropped -67.89% vs T's -64.15%.
T currently has the higher Sharpe Ratio (-0.45 vs -0.47), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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