CMCSA vs. CSCO

Last updated Jun 4, 2026

CMCSA (Comcast Corporation) and CSCO (Cisco Systems, Inc.) are both stocks. CMCSA operates in Entertainment (Communication Services), while CSCO operates in Communication Equipment (Technology). Over the past 10 years, CMCSA returned 0.72%/yr vs 19.37%/yr for CSCO. At a 0.34 correlation, their price movements are largely independent.

Performance

CMCSA vs. CSCO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Comcast Corporation (CMCSA) and Cisco Systems, Inc. (CSCO). 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 CSCO's 66.00% return. Over the past 10 years, CMCSA has underperformed CSCO with an annualized return of 0.72%, while CSCO has yielded a comparatively higher 19.37% 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%

CSCO

• 1D: -1.17%
• 1M: 36.56%
• YTD: 66.00%
• 6M: 64.46%
• 1Y: 101.07%
• 3Y*: 40.06%
• 5Y*: 21.97%
• 10Y*: 19.37%

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

CMCSA vs. CSCO - 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%
CSCO Cisco Systems, Inc.	66.00%	33.47%	21.00%	9.30%	-22.46%	45.76%	-3.49%	13.81%	16.57%	31.27%

Correlation

The correlation between CMCSA and CSCO is 0.00, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.00
Correlation (3Y) Calculated over the trailing 3-year period	0.25
Correlation (5Y) Calculated over the trailing 5-year period	0.37
Correlation (10Y) Calculated over the trailing 10-year period	0.39
Correlation (All Time) Calculated using the full available price history since Mar 27, 1990	0.34

Over the past year, the correlation between CMCSA and CSCO has dropped to 0.00 - well below their long-term average of 0.34, suggesting their price drivers have been diverging.

Fundamentals

Market Cap CMCSA : $85.07B CSCO : $504.36B
EPS CMCSA : $5.05 CSCO : $3.00
PE Ratio CMCSA : 4.66 CSCO : 42.21
PEG Ratio CMCSA : 0.10 CSCO : 35.41
PS Ratio CMCSA : 0.69 CSCO : 8.31
PB Ratio CMCSA : 0.96 CSCO : 10.32
Total Revenue (TTM) CMCSA : $125.28B CSCO : $60.75B
Gross Profit (TTM) CMCSA : $77.26B CSCO : $39.08B
EBITDA (TTM) CMCSA : $45.00B CSCO : $13.98B

Return for Risk

CMCSA vs. CSCO — 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

CSCO

CSCO Risk / Return Rank: 95
CSCO Sharpe Ratio Rank: 95
CSCO Sortino Ratio Rank: 94
CSCO Omega Ratio Rank: 95
CSCO Calmar Ratio Rank: 95
CSCO Martin Ratio Rank: 95

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. CSCO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Comcast Corporation (CMCSA) and Cisco Systems, Inc. (CSCO). 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	CSCO	Difference
Sharpe ratio Return per unit of total volatility	-0.69	3.40	-4.09
Sortino ratio Return per unit of downside risk	-0.82	3.99	-4.80
Omega ratio Gain probability vs. loss probability	0.89	1.61	-0.72
Calmar ratio Return relative to maximum drawdown	-0.75	7.49	-8.24
Martin ratio Return relative to average drawdown	-1.46	21.00	-22.46
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. CSCO - Sharpe Ratio Comparison

The current CMCSA Sharpe Ratio is -0.69, which is lower than the CSCO Sharpe Ratio of 3.40. The chart below compares the historical Sharpe Ratios of CMCSA and CSCO, 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	CSCO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-0.69	3.40	-4.09
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.43	0.90	-1.33
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.03	0.75	-0.73
Sharpe Ratio (All Time) Calculated using the full available price history	0.27	0.61	-0.34

Drawdowns

CMCSA vs. CSCO - Drawdown Comparison

The maximum CMCSA drawdown since its inception was -67.89%, smaller than the maximum CSCO drawdown of -89.26%. Use the drawdown chart below to compare losses from any high point for CMCSA and CSCO.

Drawdown Indicators

	CMCSA	CSCO	Difference
Max Drawdown Largest peak-to-trough decline	-67.89%	-89.26%	+21.37%
Max Drawdown (1Y) Largest decline over 1 year	-26.74%	-13.57%	-13.17%
Max Drawdown (3Y) Largest decline over 3 years	-39.87%	-20.16%	-19.71%
Max Drawdown (5Y) Largest decline over 5 years	-52.11%	-36.68%	-15.43%
Max Drawdown (10Y) Largest decline over 10 years	-52.11%	-41.95%	-10.16%
Current Drawdown Current decline from peak	-50.07%	-1.17%	-48.90%
Average Drawdown Average peak-to-trough decline	-24.60%	-40.14%	+15.54%
Ulcer Index Depth and duration of drawdowns from previous peaks	13.73%	4.83%	+8.90%

Volatility

CMCSA vs. CSCO - Volatility Comparison

The current volatility for Comcast Corporation (CMCSA) is 7.07%, while Cisco Systems, Inc. (CSCO) has a volatility of 15.37%. This indicates that CMCSA experiences smaller price fluctuations and is considered to be less risky than CSCO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CMCSA	CSCO	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.07%	15.37%	-8.30%
Volatility (6M) Calculated over the trailing 6-month period	25.07%	25.85%	-0.78%
Volatility (1Y) Calculated over the trailing 1-year period	29.29%	29.87%	-0.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.94%	24.62%	+2.32%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.48%	25.76%	+0.72%

Dividends

CMCSA vs. CSCO - Dividend Comparison

CMCSA's dividend yield for the trailing twelve months is around 12.34%, more than CSCO's 1.30% 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%
CSCO Cisco Systems, Inc.	1.30%	2.12%	2.69%	3.07%	3.17%	2.32%	3.20%	2.88%	2.95%	2.95%	3.28%	3.02%

Financials

CMCSA vs. CSCO - Profitability Comparison

The chart below illustrates the profitability comparison between Comcast Corporation and Cisco Systems, Inc. over time, highlighting three key metrics: Gross Profit Margin, Operating Margin, and Net Profit Margin.

CMCSA - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Comcast Corporation reported a gross profit of 20.57B and revenue of 31.46B. Therefore, the gross margin over that period was 65.4%.

CSCO - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Cisco Systems, Inc. reported a gross profit of 10.08B and revenue of 15.84B. Therefore, the gross margin over that period was 63.6%.

CMCSA - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Comcast Corporation reported an operating income of 4.14B and revenue of 31.46B, resulting in an operating margin of 13.1%.

CSCO - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Cisco Systems, Inc. reported an operating income of 3.96B and revenue of 15.84B, resulting in an operating margin of 25.0%.

CMCSA - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Comcast Corporation reported a net income of 2.17B and revenue of 31.46B, resulting in a net margin of 6.9%.

CSCO - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Cisco Systems, Inc. reported a net income of 3.37B and revenue of 15.84B, resulting in a net margin of 21.3%.

Frequently Asked Questions

Can I hold both CMCSA and CSCO in my portfolio?

CMCSA and CSCO have a correlation of 0.00, 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 CSCO?

CSCO has higher volatility (15.37%) compared to CMCSA (7.07%). In terms of maximum drawdown, CMCSA dropped -67.89% vs CSCO's -89.26%.

Which has better risk-adjusted returns?

CSCO currently has the higher Sharpe Ratio (3.40 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.