In September 1997, the company acquired US temporary staffing company TAD Resources International of Cambridge, Massachusetts, for $387.5 million.
The company acquired Olsten Staffing in late 1999, and became the largest recruitment company in the U.S., with a combined revenue of €11.6 billion.
UK recruitment company Spring Group was acquired in 2009, and a year later in 2010, Jacksonville, Florida-based staffing firm MPS Group was acquired for an estimated 1.3 billion.
At the start of 2011, The Adecco Group began a joint venture in Shanghai with Chinese HR services company FESCO and in September of that year, acquired US-based Drake Beam Morin, Inc.
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In January 2012, it was announced that the company had acquired Japanese staffing service VSN Inc.
2014 saw the acquisition of U.S freelance worker-on-demand company OnForce of Lexington, Kentucky.
Canadian recruitment services company Knightsbridge Human Capital Solutions, a company offering career transition, talent and leadership development, was acquired in 2015.
In March 2016, the company acquired UK recruitment services company Penna Consulting PLC.
The Adecco Group acquired Vettery, a recruitment marketplace startup, for $100 million USD in February 2018. Subsequently, Vettery and Hired were merged and operated under the Hired brand. In April of that same year, the U.S.-based education technology provider General Assembly was acquired.
In 2019, the company announced the sale of U.S. healthcare staffing business Soliant Health to Olympus Partners for a cash consideration of $612 million.
In November 2020, Vettery purchased competing tech marketplace Hired for an undisclosed amount and combined the two business's products under the Hired brand.
French engineering and technology consulting firm Akka Technologies was acquired in July 2021 for a reported €2.0 billion.
