CMCSA vs. T

Last updated Jun 4, 2026

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 0.72%/yr vs 3.62%/yr for T. At a 0.33 correlation, their price movements are largely independent.

Performance

CMCSA vs. T - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Comcast Corporation (CMCSA) and AT&T Inc. (T). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CMCSA achieves a -9.07% return, which is significantly lower than T's -3.08% return. Over the past 10 years, CMCSA has underperformed T with an annualized return of 0.72%, while T has yielded a comparatively higher 3.62% annualized return.

CMCSA

• 1D: -5.35%
• 1M: -13.11%
• YTD: -9.07%
• 6M: -0.92%
• 1Y: -20.03%
• 3Y*: -9.09%
• 5Y*: -11.49%
• 10Y*: 0.72%

T

• 1D: -4.42%
• 1M: -9.77%
• YTD: -3.08%
• 6M: -4.92%
• 1Y: -12.10%
• 3Y*: 22.12%
• 5Y*: 7.39%
• 10Y*: 3.62%

*Multi-year figures are annualized to reflect compound growth (CAGR)

CMCSA vs. T - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CMCSA Comcast Corporation	-9.07%	-17.35%	-11.84%	29.08%	-28.68%	-2.22%	19.13%	34.04%	-12.71%	17.45%
T AT&T Inc.	-3.08%	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 0.35, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.35
Correlation (3Y) Calculated over the trailing 3-year period	0.32
Correlation (5Y) Calculated over the trailing 5-year period	0.40
Correlation (10Y) Calculated over the trailing 10-year period	0.41
Correlation (All Time) Calculated using the full available price history since Jul 8, 1988	0.33

Fundamentals

EPS CMCSA : $5.05 T : $3.04
PE Ratio CMCSA : 4.66 T : 7.73
PEG Ratio CMCSA : 0.10 T : 0.32
PS Ratio CMCSA : 0.69 T : 1.35
Total Revenue (TTM) CMCSA : $125.28B T : $125.65B
Gross Profit (TTM) CMCSA : $77.26B T : $105.41B
EBITDA (TTM) CMCSA : $45.00B T : $54.70B

Return for Risk

CMCSA vs. T — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

CMCSA

CMCSA Risk / Return Rank: 11
CMCSA Sharpe Ratio Rank: 12
CMCSA Sortino Ratio Rank: 14
CMCSA Omega Ratio Rank: 13
CMCSA Calmar Ratio Rank: 12
CMCSA Martin Ratio Rank: 6

T

T Risk / Return Rank: 17
T Sharpe Ratio Rank: 17
T Sortino Ratio Rank: 16
T Omega Ratio Rank: 17
T Calmar Ratio Rank: 19
T Martin Ratio Rank: 14

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

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.

	CMCSA	T	Difference
Sharpe ratio: Return per unit of total volatility	-0.69	-0.56	-0.13
Sortino ratio: Return per unit of downside risk	-0.82	-0.67	-0.14
Omega ratio: Gain probability vs. loss probability	0.89	0.92	-0.03
Calmar ratio: Return relative to maximum drawdown	-0.75	-0.59	-0.16
Martin ratio: Return relative to average drawdown	-1.46	-1.20	-0.26
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CMCSA vs. T - Sharpe Ratio Comparison

The current CMCSA Sharpe Ratio is -0.69, which is comparable to the T Sharpe Ratio of -0.56. The chart below compares the historical Sharpe Ratios of CMCSA and T, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	CMCSA	T	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-0.69	-0.56	-0.13
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.43	0.31	-0.74
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.03	0.15	-0.13
Sharpe Ratio (All Time) Calculated using the full available price history	0.27	0.38	-0.11

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.

Drawdown Indicators

	CMCSA	T	Difference
Max Drawdown Largest peak-to-trough decline	-67.89%	-64.15%	-3.74%
Max Drawdown (1Y) Largest decline over 1 year	-26.74%	-20.60%	-6.14%
Max Drawdown (3Y) Largest decline over 3 years	-39.87%	-20.60%	-19.27%
Max Drawdown (5Y) Largest decline over 5 years	-52.11%	-32.01%	-20.10%
Max Drawdown (10Y) Largest decline over 10 years	-52.11%	-42.35%	-9.76%
Current Drawdown Current decline from peak	-50.07%	-18.23%	-31.84%
Average Drawdown Average peak-to-trough decline	-24.60%	-15.72%	-8.88%
Ulcer Index Depth and duration of drawdowns from previous peaks	13.73%	10.08%	+3.65%

Volatility

CMCSA vs. T - Volatility Comparison

Comcast Corporation (CMCSA) and AT&T Inc. (T) have volatilities of 7.07% and 6.96%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CMCSA	T	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.07%	6.96%	+0.11%
Volatility (6M) Calculated over the trailing 6-month period	25.07%	17.27%	+7.80%
Volatility (1Y) Calculated over the trailing 1-year period	29.29%	21.86%	+7.43%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.94%	23.92%	+3.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.48%	23.69%	+2.79%

Dividends

CMCSA vs. T - Dividend Comparison

CMCSA's dividend yield for the trailing twelve months is around 12.34%, more than T's 4.71% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CMCSA Comcast Corporation	12.34%	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.	4.71%	4.47%	4.87%	6.62%	6.66%	8.46%	7.23%	5.22%	7.01%	5.04%	4.51%	5.46%

Financials

Frequently Asked Questions

Can I hold both CMCSA and T in my portfolio?

CMCSA and T have a correlation of 0.35, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CMCSA or T?

CMCSA has higher volatility (7.07%) compared to T (6.96%). In terms of maximum drawdown, CMCSA dropped -67.89% vs T's -64.15%.

Which has better risk-adjusted returns?

T currently has the higher Sharpe Ratio (-0.56 vs -0.69), 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.