Ed Eskandarian, a former partial-owner of the Boston Red Sox,[2] acquired the agency in 1990 and grew Arnold "through about a dozen acquisitions".

The Delaney Report, an industry newsletter, declared Arnold Worldwide "Best Ad Agency in the Nation" for the third quarter of 2010 as a result of their "strong new business track record.

[13] August 2017, Icaro Doria was named Global Chief Creative Officer, after having served as CCO of DDB New York.

[15] December 2019, George Sargent, President of Havas Media Boston, was appointed CEO of Arnold Worldwide with Sean McBride assuming the role of chief creative officer.

In October 2023 veteran advertising executive Andrew Arnot was hired as Managing Director, focusing on the Progressive Insurance account.