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In 1961, the company changed its name to Automatic Data Processing, Inc. (ADP), and began using punched card machines, check printing machines, and mainframe computers. ADP went public in 1961 with 300 clients, 125 employees, and revenues of approximately $400,000 USD. [2] The company established a subsidiary in the United Kingdom in 1965.

ADP (company), an American provider of human resources management software and services. Association of Directory Publishers, an international trade organization for print and online directory publishers. Alpha Delta Phi (ΑΔΦ), a fraternal organization on college campuses. Alpha Delta Pi (ΑΔΠ), a sorority organization on college campuses.