(Fortune) -- Few companies get as easy and guaranteed a PR hit as Automatic Data Processing (ADP). Each month its eponymous payroll report comes out two days before the government's own and gets reported, dissected, and beamed out to anxious market watchers the world over. "You couldn't buy the coverage," says CEO Gary Butler.
But the 60-year-old firm is actually a full-service provider of administrative help, handling not only payroll but also services like 401(k) and health-insurance administration. The diversified model -- along with a solid balance sheet -- helped it weather a year in which corporations cut hundreds of thousands of jobs, and propelled it to the top spot in financial data services on our World's Most Admired Companies list.
Payroll processing is hardly a sexy business, but that's why ADP does so well. Look at your paycheck and see how many different taxes come out (yes, we know it's depressing). Companies would rather focus on their core business than the minutiae of calculating federal withholding taxes.
And once customers sign up, they tend to stick around: The average client stays with ADP for nearly 10 years. Take Ikea, which took three years to set up ADP's payroll services for 85,000 employees in 20 countries. "You're not going to change that casually," says Butler, who joined ADP in 1975.
While payroll has been ADP's mainstay since it started in 1949 (New Jersey Sen. Frank Lautenberg was its first full-time salesman and second CEO), non-payroll services now make up 40% of its revenue.
ADP is also one of only four U.S. industrial companies with a triple-A rating from both Moody's and Standard & Poor's. (The other three are Exxon Mobil (XOM, Fortune 500), Johnson & Johnson (JNJ, Fortune 500), and Microsoft (MSFT, Fortune 500).)
With a third of pretax income coming from the interest on its float -- the $15 billion it holds between the time employers hand over the dough to pay their workers and when it gets transferred to workers' banks -- ADP could benefit from rising interest rates.
So when will employers start hiring again? That's one data point ADP doesn't put out, but Butler is hopeful based on his own indicators: "Our salespeople are selling again," he says. "For a year people were doing nothing."
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