The present invention is merchandising tray system. Within the system, a tray top plate is slidably mounted to a tray base plate, allowing the tray top plate to be extended beyond the edge of the shelf to which the system is mounted. A plurality of sidewalls are removably mounted to the tray top plate, allowing controlled expansion and contraction of the width of the system supporting products. A support arm is slidably extendable from the tray base plate, allowing the system to be mounted along any depth of the shelf.