AMT vs. CMCSA
AMT (American Tower Corporation) and CMCSA (Comcast Corporation) are both stocks. AMT operates in REIT - Specialty (Real Estate), while CMCSA operates in Entertainment (Communication Services). Over the past 10 years, AMT returned 8.47%/yr vs 1.27%/yr for CMCSA. At a 0.30 correlation, their price movements are largely independent.
Performance
AMT vs. CMCSA - Performance Comparison
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Returns By Period
In the year-to-date period, AMT achieves a 8.71% return, which is significantly higher than CMCSA's -5.28% return. Over the past 10 years, AMT has outperformed CMCSA with an annualized return of 8.47%, while CMCSA has yielded a comparatively lower 1.27% annualized return.
AMT
- 1D
- -0.18%
- 1M
- 10.83%
- YTD
- 8.71%
- 6M
- 6.65%
- 1Y
- -9.49%
- 3Y*
- 3.15%
- 5Y*
- -3.91%
- 10Y*
- 8.47%
CMCSA
- 1D
- 2.21%
- 1M
- -2.66%
- YTD
- -5.28%
- 6M
- 3.97%
- 1Y
- -17.53%
- 3Y*
- -8.98%
- 5Y*
- -10.72%
- 10Y*
- 1.27%
AMT vs. CMCSA - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
AMT American Tower Corporation | 8.71% | -0.92% | -12.16% | 5.37% | -25.67% | 32.89% | -0.48% | 47.87% | 13.32% | 37.71% |
CMCSA Comcast Corporation | -5.28% | -17.35% | -11.84% | 29.08% | -28.68% | -2.22% | 19.13% | 34.04% | -12.71% | 17.45% |
Correlation
The correlation between AMT and CMCSA is 0.24, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.24 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.21 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.29 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.25 |
Correlation (All Time) Calculated using the full available price history since Jun 5, 1998 | 0.30 |
Fundamentals
AMT:
$87.38B
CMCSA:
$88.62B
AMT:
$6.14
CMCSA:
$5.05
AMT:
30.46
CMCSA:
4.85
AMT:
8.69
CMCSA:
0.10
AMT:
8.10
CMCSA:
0.72
AMT:
23.92
CMCSA:
1.00
AMT:
$10.82B
CMCSA:
$125.28B
AMT:
$7.94B
CMCSA:
$77.26B
AMT:
$6.71B
CMCSA:
$45.00B
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Return for Risk
AMT vs. CMCSA — Risk / Return Rank
AMT
CMCSA
AMT vs. CMCSA - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Tower Corporation (AMT) and Comcast Corporation (CMCSA). 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.
| AMT | CMCSA | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.21 | ||
| Sortino ratioReturn per unit of downside risk | +0.28 | ||
| Omega ratioGain probability vs. loss probability | 0.95 | 0.90 | +0.04 |
| Calmar ratioReturn relative to maximum drawdown | -0.38 | -0.67 | +0.29 |
| Martin ratioReturn relative to average drawdown | -0.54 | -1.26 | +0.72 |
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Drawdowns
AMT vs. CMCSA - Drawdown Comparison
The maximum AMT drawdown since its inception was -98.70%, which is greater than CMCSA's maximum drawdown of -67.89%. Use the drawdown chart below to compare losses from any high point for AMT and CMCSA.
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Drawdown Indicators
| AMT | CMCSA | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -98.70% | -67.89% | -30.81% |
Max Drawdown (1Y)Largest decline over 1 year | -26.67% | -27.34% | +0.67% |
Max Drawdown (3Y)Largest decline over 3 years | -27.54% | -39.87% | +12.33% |
Max Drawdown (5Y)Largest decline over 5 years | -45.34% | -52.11% | +6.77% |
Max Drawdown (10Y)Largest decline over 10 years | -45.34% | -52.11% | +6.77% |
Current DrawdownCurrent decline from peak | -27.92% | -47.99% | +20.07% |
Average DrawdownAverage peak-to-trough decline | -27.02% | -24.62% | -2.40% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 18.40% | 14.38% | +4.02% |
Volatility
AMT vs. CMCSA - Volatility Comparison
American Tower Corporation (AMT) has a higher volatility of 9.22% compared to Comcast Corporation (CMCSA) at 7.12%. This indicates that AMT's price experiences larger fluctuations and is considered to be riskier than CMCSA based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| AMT | CMCSA | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 9.22% | 7.12% | +2.10% |
Volatility (6M)Calculated over the trailing 6-month period | 19.39% | 24.86% | -5.47% |
Volatility (1Y)Calculated over the trailing 1-year period | 24.22% | 29.24% | -5.02% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 26.39% | 26.96% | -0.57% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 26.21% | 26.49% | -0.28% |
Dividends
AMT vs. CMCSA - Dividend Comparison
AMT's dividend yield for the trailing twelve months is around 4.64%, less than CMCSA's 11.84% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
AMT American Tower Corporation | 3.73% | 3.87% | 3.53% | 2.99% | 2.77% | 1.78% | 2.02% | 1.64% | 1.99% | 1.84% | 2.05% | 1.87% |
CMCSA Comcast Corporation | 11.84% | 4.35% | 3.25% | 2.60% | 3.03% | 1.95% | 1.72% | 1.40% | 2.69% | 1.18% | 1.96% | 1.73% |
Financials
AMT vs. CMCSA - Financials Comparison
This section allows you to compare key financial metrics between American Tower Corporation and Comcast Corporation. 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
AMT vs. CMCSA - Profitability Comparison
AMT - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, American Tower Corporation reported a gross profit of 2.02B and revenue of 2.74B. Therefore, the gross margin over that period was 73.9%.
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%.
AMT - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, American Tower Corporation reported an operating income of 1.16B and revenue of 2.74B, resulting in an operating margin of 42.4%.
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%.
AMT - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, American Tower Corporation reported a net income of 836.80M and revenue of 2.74B, resulting in a net margin of 30.6%.
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%.
Frequently Asked Questions
AMT and CMCSA have a correlation of 0.24, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
AMT has higher volatility (9.22%) compared to CMCSA (7.12%). In terms of maximum drawdown, AMT dropped -98.70% vs CMCSA's -67.89%.
AMT currently has the higher Sharpe Ratio (-0.42 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.
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