Abstract: A sign display mountable over a top surface of a cubicle wall includes a sign holder having a frame and a depending post extending therefrom for carrying a sign. A clamp assembly has a pair of engaging members and an attachment for securing the engaging members together to abut respective opposed vertical surfaces of a cubicle wall and a horizontal wall portion with an upper and lower surface. One engaging member includes at least one hole and the other engaging member includes an elongate slot. A threaded bolt is positionable upwardly through the elongate slot and one hole for securing the engaging members together. Each engaging member is a bracket formed as an L-shaped member to abut against a vertical surface of a cubicle wall and a horizontal wall portion.