Percent change in each close since the start of the chosen range, for both companies and the S&P 500 (SPY). Daily closes over the last year, weekly before that and monthly before five years.
In short
How the two compare
On the latest closes (28 Oct 2026), T-Mobile US is the larger company by market value ($158.69B against $76.83B). Over the past year Comcast returned −18.8% and T-Mobile US −31.9%, while the S&P 500 returned +12.7%. The latest filed P/E is 3.9 for Comcast and 14.9 for T-Mobile US, and the operating margin 18.2% against 24%. Over the next 21 sessions the model expects +0.13% for Comcast, with a 50% chance of a rise, and −0.03% for T-Mobile US, with a 43% chance.
Model view
What the model expects
Expected returns and the chance of a rise from our forecasting models, and the long-run fair value against the price. Readings, not advice.
Model readings:
MeasureComcast · CMCSAT-Mobile US · TMUS
Expected returnnext 21 sessions
CMCSA+0.13%
TMUS−0.03%
Chance of a risenext 21 sessions
CMCSA50%
TMUS43%
Expected returnnext 63 sessions
CMCSA+1.43%
TMUS−0.29%
Range of outcomes63 sessions, 80% band
CMCSA−22.3% to +25.2%
TMUS−28.9% to +28.3%
Chance of a risenext 63 sessionsMembers only · see plans
Long-run fair valueintrinsic value model
CMCSA—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
TMUS—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
Gap to pricefair value against the close
CMCSA—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
TMUS—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
Past readings that matchedsign of the 21-session outcome
CMCSA41.4%of 269
TMUS39.8%of 269
Price performance
How the prices moved
Price change over each period, with the S&P 500 (SPY) for comparison.
Closes to
MeasureComcast · CMCSAT-Mobile US · TMUS
1 monthS&P 500: +1.1%
CMCSA−0.1%
TMUS−9.1%
6 monthsS&P 500: +8.5%
CMCSA−18.3%
TMUS−24.9%
Year to dateS&P 500: +13.3%
CMCSA−20.1%
TMUS−26.3%
1 yearS&P 500: +12.7%
CMCSA−18.8%
TMUS−31.9%
5 yearsS&P 500: +70.7%
CMCSA−50.7%
TMUS+27%
1 year against the S&P 500percentage points
CMCSA−31.5 pts
TMUS−44.6 pts
Position in the 52-week range0% low, 100% high
CMCSA9%close $21.57 in $20.48 to $32.05
TMUS6%close $148.08 in $143.75 to $222.47
Against the 200-day average
CMCSA−16.5%
TMUS−20.7%
Valuation
What the market pays
Size and the multiples from the latest filed quarter. A P/E on losses reads n/m.
Filings: quarter to
MeasureComcast · CMCSAT-Mobile US · TMUS
Market value
CMCSA$76.83B28 Oct 2026
TMUS$158.69B28 Oct 2026
Enterprise valueat the last filing
CMCSA$157.28B30 Sep 2026
TMUS$249.68B30 Sep 2026
P/Elatest filed
CMCSA3.9
TMUS14.9
Price to book
CMCSA0.84
TMUS3.10
EV / EBITDA
CMCSA4.38
TMUS7.57
Free cash flow yield
CMCSA25.37%
TMUS10.44%
Dividend yield
CMCSA6.21%
TMUS2.42%
Profitability
How much of revenue becomes profit
Margins and returns on capital from the latest filing; revenue, net income and earnings per share over the trailing twelve months.
Filings: quarter to
MeasureComcast · CMCSAT-Mobile US · TMUS
Gross margin
CMCSA18.2%
TMUS24%
Operating margin
CMCSA18.2%
TMUS24%
Net margin
CMCSA11.8%
TMUS14.7%
Return on equity
CMCSA21.8%
TMUS20.8%
Return on invested capital
CMCSA2.2%
TMUS3.1%
Revenuetrailing twelve months
CMCSA$121.81B
TMUS$89.94B
Net incometrailing twelve months
CMCSA$20.11B
TMUS$11.73B
Earnings per sharetrailing twelve months
CMCSA$5.65
TMUS$10.95
Growth
How fast the business grew
Change against the same quarter a year earlier.
Filings: quarter to
MeasureComcast · CMCSAT-Mobile US · TMUS
Revenue growthyear over year
CMCSA−6.1%
TMUS+7.4%
Earnings growthyear over year
CMCSA+3.5%
TMUS+27.3%
Free cash flow growthyear over year
CMCSA−13.3%
TMUS+5.3%
Financial health
Balance sheet and quality scores
Leverage, liquidity and two published scores: Altman Z (below 1.8 the distress zone, above 3 the safe zone) and Piotroski F (0 to 9).
Filings: quarter to
MeasureComcast · CMCSAT-Mobile US · TMUS
Debt to equity
CMCSA0.95
TMUS1.43
Current ratiocurrent assets over current liabilities
CMCSA0.82
TMUS0.91
Altman Z-score
CMCSA—Not in the latest filing data.
TMUS—Not in the latest filing data.
Piotroski F-scoreout of 9
CMCSA6 of 9
TMUS5 of 9
Trading and risk
How the shares trade
Volatility, sensitivity to the market, the deepest fall, short interest and how closely the two move together.
Closes to ; FINRA settlement
MeasureComcast · CMCSAT-Mobile US · TMUS
Volatility21 sessions, annualised
CMCSA27.4%
TMUS62.4%
Betaagainst the S&P 500, 5 years
CMCSA0.59
TMUS0.50
Deepest fallpeak to trough, 5 years
CMCSA−52.4%
TMUS−45.1%
Market regimeour reading at each model date
CMCSAStrong risk-off
TMUSStrong risk-off
Short interestshare of the float
CMCSA1.8%settled 30 Sep 2026
TMUS3%settled 30 Sep 2026
Days to covershort shares over average volume
CMCSA1.9
TMUS2.3
Average volume3 months, shares a day
CMCSA28.32M
TMUS5.27M
Moving togethercorrelation of daily returns, past year0.42, loosely together−1 opposite0 unrelated+1 together
Questions
Comcast or T-Mobile US: common questions
Which is larger by market value, Comcast or T-Mobile US?
T-Mobile US, at $158.69B against $76.83B for Comcast, on the latest closes (28 Oct 2026).
Which has the higher P/E ratio, Comcast or T-Mobile US?
T-Mobile US has the higher latest filed P/E, 14.9; Comcast's is 3.9. Filings: quarter to 30 Sep 2026.
How did Comcast and T-Mobile US move over the past year against the S&P 500?
Over the past year Comcast returned −18.8% and T-Mobile US −31.9%, while the S&P 500 returned +12.7%. Prices at close 28 Oct 2026.
What does the model expect for Comcast and T-Mobile US over the next month?
+0.13% for Comcast with a 50% chance of a rise, and −0.03% for T-Mobile US with a 43% chance, over the next 21 sessions. Model readings 28 Oct 2026. These are model readings, not advice.
How do the operating margins of Comcast and T-Mobile US compare?
The operating margin is 18.2% for Comcast and 24% for T-Mobile US, and the gross margin 18.2% against 24%. Filings: quarter to 30 Sep 2026.
Do Comcast and T-Mobile US shares move together?
Over the past year the correlation of their daily returns was 0.42 (loosely together); 1 means they always move together, 0 unrelated, −1 opposite. Prices at close 28 Oct 2026.
In the consoleCompare up to four companies with every model readingMembers see the 63-session chance of a rise and all four horizons, side by side in Research › Compare.
Model readings are research estimates, not investment advice. Prices: daily closes. Fundamentals: the latest SEC filings. Short interest: FINRA, settlement 30 Sep 2026. A dash means the figure is not in our data; it is never shown as zero. The model view follows a published rule: next month by the sign of the expected return, the long run positive at a fair value 10% or more above the price and negative at 10% or more below it.