Ceridian Corporation, an information services company, provides services to the human resource, transportation, and retail markets in the United States, Canada, and the United Kingdom. It operates through two segments, Human Resource Solutions (HRS) and Comdata. Ceridian Corporation was founded in 1957 and is headquartered in Minneapolis, Minnesota.

On May 31, 2007, Ceridian announced that it had agreed to be acquired by a company formed by Thomas H. Lee Partners, LP and Fidelity National Financial, Inc., in a transaction that valued Ceridian at $5.3 billion.

Cypress advised certain institutional shareholders of Ceridian with respect to issues related to the sale process, the terms of the merger agreement and disclosure in the Ceridian merger proxy. The merger terms and proxy were amended to include certain changes recommended by Cypress. The transaction was approved by Ceridian shareholders on September 12th, 2007.