Automatic Data Processing vs Paychex
Prices at close . Model readings .
Automatic Data Processing
$285.37−2.64%- Market value
- $115.09B
- P/E
- 20.5
- 1 year
- +4%
Paychex
$108.21−0.96%- Market value
- $38.59B
- P/E
- 25.1
- 1 year
- −9.6%
Price change, with the S&P 500 as a benchmark
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.
How the two compare
On the latest closes (28 Oct 2026), Automatic Data Processing is the larger company by market value ($115.09B against $38.59B). Over the past year Automatic Data Processing returned +4% and Paychex −9.6%, while the S&P 500 returned +12.7%. The latest filed P/E is 20.5 for Automatic Data Processing and 25.1 for Paychex, and the operating margin -0.2% against 38%. Over the next 21 sessions the model expects +0.88% for Automatic Data Processing, with a 71% chance of a rise, and +0.94% for Paychex, with a 79% chance. Automatic Data Processing's long-run fair value is $262.04, a gap of −8.2% to its price; the long-run model view is neutral. Paychex's long-run fair value is $109.32, a gap of +1% to its price; the long-run model view is neutral.
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.
How the prices moved
Price change over each period, with the S&P 500 (SPY) for comparison.
What the market pays
Size and the multiples from the latest filed quarter. A P/E on losses reads n/m.
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.
How fast the business grew
Change against the same quarter a year earlier.
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).
How the shares trade
Volatility, sensitivity to the market, the deepest fall, short interest and how closely the two move together.
Automatic Data Processing or Paychex: common questions
Which is larger by market value, Automatic Data Processing or Paychex?
Automatic Data Processing, at $115.09B against $38.59B for Paychex, on the latest closes (28 Oct 2026).
Which has the higher P/E ratio, Automatic Data Processing or Paychex?
Paychex has the higher latest filed P/E, 25.1; Automatic Data Processing's is 20.5. Filings: quarter to 30 Jun 2026 and 31 Aug 2026.
How did Automatic Data Processing and Paychex move over the past year against the S&P 500?
Over the past year Automatic Data Processing returned +4% and Paychex −9.6%, while the S&P 500 returned +12.7%. Prices at close 28 Oct 2026.
What does the model expect for Automatic Data Processing and Paychex over the next month?
+0.88% for Automatic Data Processing with a 71% chance of a rise, and +0.94% for Paychex with a 79% chance, over the next 21 sessions. Model readings 28 Oct 2026. These are model readings, not advice.
How do the operating margins of Automatic Data Processing and Paychex compare?
The operating margin is -0.2% for Automatic Data Processing and 38% for Paychex, and the gross margin 46.4% against 73.6%. Filings: quarter to 30 Jun 2026 and 31 Aug 2026.
Do Automatic Data Processing and Paychex shares move together?
Over the past year the correlation of their daily returns was 0.87 (closely together); 1 means they always move together, 0 unrelated, −1 opposite. Prices at close 28 Oct 2026.
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.