Exclaimer is a privately held UK-based information technology company owned by Insight Partners.

Its products are designed to work with Microsoft Exchange Server, Office 365 and Google Workspace.

[4] On 11 October 2021, Exclaimer appointed Marco Costa as its new chief executive following Heath Davies standing down.

[5] On 17 September 2024, Exclaimer appointed Rob Singer, a former C-Suite at Ancestry.com as CEO following Costa's decision to step down.

The company has a number of international offices, including regional headquarters for the Americas in Miami, United States, and for Europe in Hoorn, Netherlands.