AUTOMATIC DATA PROCESSING INC

In 1949, Henry Taub founded Automatic Payrolls, Inc. as a manual payroll processing company with his brother Joe Taub. Future United States Senator Frank Lautenberg joined the brothers in the company's infancy. In 1954, Lautenberg, after successfully serving in sales and marketing, became a full-fledged partner with the two brothers.

In 1957 the company installed a punched card system that would facilitate automatic data processing, replacing manual input calculators. The next year the company changed its name to Automatic Data Processing. In 1961, Oppenheimer & Company, one of ADP's clients, took the company public. At that time the company had 300 clients, 125 employees, and revenues of approximately US$400,000.

In 1962, ADP opened a Wall Street office to provide payroll and accounting services to brokerage firms. This office eventually expanded into ADP's brokerage service division, which was spun off into Broadridge Financial Solutions in 1997.

ADP established its dealer services business in 1973 after acquiring National Inventory Control System, a Portland -based inventory control service and data center, and CSI Computer Systems of Cincinnati. These moves extended ADP's reach into another industry-specific market, and the company later completed more than 30 dealer service acquisitions before spinning the division off into a separate company.

From 1985 onward, ADP's annual revenues exceeded the $1 billion mark, with paychecks processed for about 20% of the U.S. workforce. In August 1996, ADP began acting as a professional employer organization (PEO) after acquiring Staff Management Systems of Tampa, Florida.

On October 21, 2008, ADP switched its stock listing to the NASDAQ Global Select Market.

In 2020, ADP was ranked 227 on the Fortune 500 list of the largest United States corporations by revenue. ADP has also been included on Fortune Magazine's "World's Most Admired Companies" List for 14 consecutive years and has earned recognition from DiversityInc as one of the top companies for diversity and inclusion in the United States for 11 consecutive years.

ADP has about 67,000 employees worldwide and its fiscal year 2025 revenues were $20.6 billion.

Acquisitions

ADP acquired the pioneering online computer services company Time Sharing Limited (TSL) in 1974 [ citation needed ] and Cyphernetics in 1975.

As ADP became a professional employer organization, it made several acquisitions. In 1995, the company acquired the German company Autonom and the payroll and human resource services company GSI, among others. In September 1998, ADP acquired UK-based Chessington Computer Centre that supplied administration services to the UK Government.

In 2006, ADP acquired Kerridge Computer Co. Ltd., a dealer management systems (DMS) provider to auto dealers, primarily in the UK. In 2007, the ADP Brokerage Service Group was spun off to form Broadridge Financial Solutions, Inc.

In January 2017, ADP acquired The Marcus Buckingham Company (TMBC). In October 2017, ADP acquired Global Cash Card, a digital payments facilitator. [ non-primary source needed ] In January 2018, ADP acquired WorkMarket, a New York City –based software platform company that helps businesses manage freelancers, contractors, and consultants. Later that same year, the company announced the acquisition of Celergo, a global payroll management service company.

In 2023, ADP acquired workflow automation tool Sora. In October 2024, ADP acquired WorkForce Software, a management services provider.