In 1967, Wellington merged with Boston-based investment management firm Thorndike, Doran, Paine & Lewis.

Today, the firm manages alternatives assets for clients totaling over US$40 billion and offers over 40 funds.

[15] Headquartered in Boston, the company has an office in Radnor, PA, and opened offices in London in 1983; Singapore in 1996; San Francisco, Sydney, and Tokyo in 1997, Hong Kong in 2003; Chicago in 2004; Beijing in 2007; Frankfurt in 2011; Zürich and Luxembourg in 2014; Toronto in 2018; Shanghai in 2020; Milan in 2021; Madrid in 2022, and New York in 2023.

[17] The firm's Private Equity Investor, Matt Witheiler, was also named to the 2018 Midas Brink List.

[20] Also in 2016, Citywire ranked Jean Hynes one of the top 20 female portfolio managers in the United States.