Paychex, Inc. is an American provider of human resource, payroll, and benefits outsourcing services for small- to medium-sized businesses. With headquarters in Rochester, New York, the company has more than 100 offices serving approximately 670,000 payroll clients in the U.S. and Europe.

In 2019, Paychex ranked in position 700 on the Fortune 500 list of largest corporations by revenue, and the company's revenue for fiscal year 2020 is projected to exceed $4.1 billion. Paychex was founded in 1971 by Tom Golisano, who started the company with only $3,000.

The operation grew to include 18 franchises and partnerships, which were eventually consolidated into one private company in 1979.

Paychex held an initial public offering in 1983 and began trading on the NASDAQ (PAYX). In the first quarter of fiscal year 2020, the company repurchased $171.9 million of its own stock and currently has a market capitalization of $30.155 billion.

According to en.wikipedia