CSCO vs. T

Last updated Jul 17, 2026

CSCO (Cisco Systems, Inc.) and T (AT&T Inc.) are both stocks. CSCO operates in Communication Equipment (Technology), while T operates in Telecom Services (Communication Services). Over the past 10 years, CSCO returned 17.31%/yr vs 2.02%/yr for T. At a 0.28 correlation, their price movements are largely independent.

Performance

CSCO vs. T - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Cisco Systems, Inc. (CSCO) 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, CSCO achieves a 44.44% return, which is significantly higher than T's -8.33% return. Over the past 10 years, CSCO has outperformed T with an annualized return of 17.31%, while T has yielded a comparatively lower 2.02% annualized return.

CSCO

• 1D: -1.89%
• 1M: -7.94%
• 6M: 47.07%
• YTD: 44.44%
• 1Y: 66.14%
• 3Y*: 32.69%
• 5Y*: 18.62%
• 10Y*: 17.31%

T

• 1D: 2.57%
• 1M: -3.83%
• 6M: -5.16%
• YTD: -8.33%
• 1Y: -14.60%
• 3Y*: 23.91%
• 5Y*: 6.50%
• 10Y*: 2.02%

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

CSCO vs. T - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CSCO Cisco Systems, Inc.	44.44%	33.47%	21.00%	9.30%	-22.46%	45.76%	-3.49%	13.81%	16.57%	31.27%
T AT&T Inc.	-8.33%	13.97%	44.08%	-2.74%	5.76%	-8.09%	-21.37%	45.55%	-22.25%	-4.01%

Correlation

The correlation between CSCO and T is -0.12, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.12
Correlation (3Y) Calculated over the trailing 3-year period	0.07
Correlation (5Y) Calculated over the trailing 5-year period	0.21
Correlation (10Y) Calculated over the trailing 10-year period	0.28
Correlation (All Time) Calculated using the full available price history since Mar 26, 1990	0.28

The correlation between CSCO and T shifts across timeframes, from -0.12 (1 year) to 0.28 (10 years), reflecting how their relationship changes across market environments.

Fundamentals

Market Cap CSCO : $432.22B T : $152.79B
EPS CSCO : $3.00 T : $3.05
PE Ratio CSCO : 36.59 T : 7.20
PEG Ratio CSCO : 30.70 T : 0.30
PS Ratio CSCO : 7.20 T : 1.25
Total Revenue (TTM) CSCO : $60.75B T : $125.65B
Gross Profit (TTM) CSCO : $39.08B T : $105.41B
EBITDA (TTM) CSCO : $13.98B T : $54.70B

Return for Risk

CSCO vs. T — Risk / Return Rank

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

CSCO

CSCO Risk / Return Rank: 91
CSCO Sharpe Ratio Rank: 91
CSCO Sortino Ratio Rank: 87
CSCO Omega Ratio Rank: 90
CSCO Calmar Ratio Rank: 92
CSCO Martin Ratio Rank: 92

T

T Risk / Return Rank: 19
T Sharpe Ratio Rank: 16
T Sortino Ratio Rank: 17
T Omega Ratio Rank: 18
T Calmar Ratio Rank: 26
T Martin Ratio Rank: 18

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.

CSCO vs. T - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Cisco Systems, Inc. (CSCO) 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.

	CSCO	T	Difference
Sharpe ratio: Return per unit of total volatility	2.04	-0.62	+2.66
Sortino ratio: Return per unit of downside risk	2.61	-0.75	+3.36
Omega ratio: Gain probability vs. loss probability	1.38	0.91	+0.47
Calmar ratio: Return relative to maximum drawdown	4.34	-0.51	+4.84
Martin ratio: Return relative to average drawdown	11.52	-1.14	+12.67

CSCO vs. T - Sharpe Ratio Comparison

The current CSCO Sharpe Ratio is 2.04, which is higher than the T Sharpe Ratio of -0.62. The chart below compares the historical Sharpe Ratios of CSCO 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.

Drawdowns

CSCO vs. T - Drawdown Comparison

The maximum CSCO drawdown since its inception was -89.26%, which is greater than T's maximum drawdown of -64.15%. Use the drawdown chart below to compare losses from any high point for CSCO and T.

Drawdown Indicators

	CSCO	T	Difference
Max Drawdown Largest peak-to-trough decline	-89.26%	-64.15%	-25.11%
Max Drawdown (1Y) Largest decline over 1 year	-15.33%	-28.89%	+13.56%
Max Drawdown (3Y) Largest decline over 3 years	-20.16%	-28.89%	+8.73%
Max Drawdown (5Y) Largest decline over 5 years	-36.68%	-32.01%	-4.67%
Max Drawdown (10Y) Largest decline over 10 years	-41.95%	-42.35%	+0.40%
Current Drawdown Current decline from peak	-15.33%	-22.66%	+7.33%
Average Drawdown Average peak-to-trough decline	-40.04%	-15.74%	-24.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.76%	12.80%	-7.04%

Volatility

CSCO vs. T - Volatility Comparison

Cisco Systems, Inc. (CSCO) has a higher volatility of 11.04% compared to AT&T Inc. (T) at 10.04%. This indicates that CSCO'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.

Volatility by Period

	CSCO	T	Difference
Volatility (1M) Calculated over the trailing 1-month period	11.04%	10.04%	+1.00%
Volatility (6M) Calculated over the trailing 6-month period	29.08%	19.94%	+9.14%
Volatility (1Y) Calculated over the trailing 1-year period	32.54%	23.65%	+8.89%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	25.30%	24.40%	+0.90%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.04%	23.91%	+2.13%

Dividends

CSCO vs. T - Dividend Comparison

CSCO's dividend yield for the trailing twelve months is around 1.51%, less than T's 5.05% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CSCO Cisco Systems, Inc.	1.51%	2.12%	2.69%	3.07%	3.17%	2.32%	3.20%	2.88%	2.95%	2.95%	3.28%	3.02%
T AT&T Inc.	5.05%	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 CSCO and T in my portfolio?

CSCO and T have a correlation of -0.12, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CSCO or T?

CSCO has higher volatility (11.04%) compared to T (10.04%). In terms of maximum drawdown, CSCO dropped -89.26% vs T's -64.15%.

Which has better risk-adjusted returns?

CSCO currently has the higher Sharpe Ratio (2.04 vs -0.62), 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.