Josh Black is the Editor-in-Chief and Antoinette Giblin is Publications Editor at Diligent Market Intelligence (DMI). This post is based on their Diligent memorandum.
Each year, Diligent Market Intelligence (DMI) creates a ranking of the most prolific activists over the past year, based on the quantity and size of their activist investments, comprehensively derived from the DMI database.
The following categories have been used to create a points-based ranking of each activist for this year’s list: number of companies publicly subjected to activist demands, average market capitalization of targeted companies, success of public demands and the depth of news coverage on the activist on DMI in 2025. The methodology excludes investors that do not regularly employ an activist strategy and have targeted fewer than three companies in the period.

