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), Copart is the larger company by market value ($27.71B against $5.31B). Over the past year Amentum returned −3.4% and Copart −34.4%, while the S&P 500 returned +12.7%. The latest filed P/E is 42.7 for Amentum and 18.8 for Copart, and the operating margin 4.9% against 35.4%. Over the next 21 sessions the model expects −0.23% for Amentum, with a 53% chance of a rise, and +0.18% for Copart, with a 60% chance. Amentum's long-run fair value is $14.83, a gap of −31.6% to its price; the long-run model view is negative. Copart's long-run fair value is $29.78, a gap of +2.8% to its price; the long-run model view is neutral.
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:
MeasureAmentum · AMTMCopart · CPRT
Expected returnnext 21 sessions
AMTM−0.23%
CPRT+0.18%
Chance of a risenext 21 sessions
AMTM53%
CPRT60%
Expected returnnext 63 sessions
AMTM+1.95%
CPRT+1.85%
Range of outcomes63 sessions, 80% band
AMTM−22.2% to +26.1%
CPRT−22.2% to +25.9%
Chance of a risenext 63 sessionsMembers only · see plans
Long-run fair valueintrinsic value model
AMTM$14.8328 Oct 2026
CPRT$29.7828 Oct 2026
Gap to pricefair value against the close
AMTM−31.6%
CPRT+2.8%
Past readings that matchedsign of the 21-session outcome
AMTM43.1%of 269
CPRT42.9%of 269
Price performance
How the prices moved
Price change over each period, with the S&P 500 (SPY) for comparison.
Closes to
MeasureAmentum · AMTMCopart · CPRT
1 monthS&P 500: +1.1%
AMTM+19.5%
CPRT+6.7%
6 monthsS&P 500: +8.5%
AMTM−14.4%
CPRT−13.1%
Year to dateS&P 500: +13.3%
AMTM−25.2%
CPRT−26%
1 yearS&P 500: +12.7%
AMTM−3.4%
CPRT−34.4%
5 yearsS&P 500: +70.7%
AMTM—Not measured today.
CPRT−22.5%
1 year against the S&P 500percentage points
AMTM−16.1 pts
CPRT−47.1 pts
Position in the 52-week range0% low, 100% high
AMTM19%close $21.69 in $17.72 to $38.11
CPRT17%close $28.96 in $25.72 to $44.34
Against the 200-day average
AMTM−11.9%
CPRT−10.8%
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 (AMTM), (CPRT)
MeasureAmentum · AMTMCopart · CPRT
Market value
AMTM$5.31B28 Oct 2026
CPRT$27.71B28 Oct 2026
Enterprise valueat the last filing
AMTM$8.52B3 Jul 2026
CPRT—Not in the latest filing data.
P/Elatest filed
AMTM42.7
CPRT18.8
Price to book
AMTM1.09
CPRT3.06
EV / EBITDA
AMTM14.56
CPRT14.27
Free cash flow yield
AMTM9.11%
CPRT4.55%
Dividend yield
AMTM0%
CPRT0%
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 (AMTM), (CPRT)
MeasureAmentum · AMTMCopart · CPRT
Gross margin
AMTM10.3%
CPRT35.4%
Operating margin
AMTM4.9%
CPRT35.4%
Net margin
AMTM1.9%
CPRT31.8%
Return on equity
AMTM2.6%
CPRT16.3%
Return on invested capital
AMTM1.4%
CPRT14.7%
Revenuetrailing twelve months
AMTM$14.32B
CPRT$4.67B
Net incometrailing twelve months
AMTM$122.00M
CPRT$1.48B
Earnings per sharetrailing twelve months
AMTM$0.50
CPRT$1.55
Growth
How fast the business grew
Change against the same quarter a year earlier.
Filings: quarter to (AMTM), (CPRT)
MeasureAmentum · AMTMCopart · CPRT
Revenue growthyear over year
AMTM−2%
CPRT+0.4%
Earnings growthyear over year
AMTM+560%
CPRT−4.4%
Free cash flow growthyear over year
AMTM−16.5%
CPRT+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 (AMTM), (CPRT)
MeasureAmentum · AMTMCopart · CPRT
Debt to equity
AMTM0.79
CPRT—Not in the latest filing data.
Current ratiocurrent assets over current liabilities
AMTM1.52
CPRT7.91
Altman Z-score
AMTM0.93
CPRT21.00
Piotroski F-scoreout of 9
AMTM8 of 9
CPRT6 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
MeasureAmentum · AMTMCopart · CPRT
Volatility21 sessions, annualised
AMTM35.7%
CPRT34.5%
Betaagainst the S&P 500, 5 years
AMTM1.22
CPRT0.93
Deepest fallpeak to trough, 5 years
AMTM—Not measured today.
CPRT−58.9%
Market regimeour reading at each model date
AMTMStrong risk-off
CPRTStrong risk-off
Short interestshare of the float
AMTM5.1%settled 30 Sep 2026
CPRT3.3%settled 30 Sep 2026
Days to covershort shares over average volume
AMTM6.8
CPRT2.8
Average volume3 months, shares a day
AMTM2.02M
CPRT10.65M
Moving togethercorrelation of daily returns, past year0.21, loosely together−1 opposite0 unrelated+1 together
Questions
Amentum or Copart: common questions
Which is larger by market value, Amentum or Copart?
Copart, at $27.71B against $5.31B for Amentum, on the latest closes (28 Oct 2026).
Which has the higher P/E ratio, Amentum or Copart?
Amentum has the higher latest filed P/E, 42.7; Copart's is 18.8. Filings: quarter to 3 Jul 2026 and 31 Jul 2026.
How did Amentum and Copart move over the past year against the S&P 500?
Over the past year Amentum returned −3.4% and Copart −34.4%, while the S&P 500 returned +12.7%. Prices at close 28 Oct 2026.
What does the model expect for Amentum and Copart over the next month?
−0.23% for Amentum with a 53% chance of a rise, and +0.18% for Copart with a 60% chance, over the next 21 sessions. Model readings 28 Oct 2026. These are model readings, not advice.
How do the operating margins of Amentum and Copart compare?
The operating margin is 4.9% for Amentum and 35.4% for Copart, and the gross margin 10.3% against 35.4%. Filings: quarter to 3 Jul 2026 and 31 Jul 2026.
Do Amentum and Copart shares move together?
Over the past year the correlation of their daily returns was 0.21 (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.