Tranche Update on Proto Labs, Inc.'s Equity Buyback Plan announced on February 9, 2017.

Proto Labs, Inc. is a provider of comprehensive digital manufacturing service. The Company utilizes injection molding, computer numerical control (CNC) machining, three-dimensional (3D) printing and sheet metal fabrication to manufacture custom parts for its customers. The Company targets its products to product developers and engineers who use 3D computer-aided design (CAD) software to design products across a diverse range of end-markets, to the procurement and supply chain professionals seeking to source custom parts on-demand, and to various customers seeking to purchase low-volume custom parts. The Company, through Protolabs Network by Hubs (Protolabs Network), provides its customers access to a global network of manufacturing partners. Its customers engage with the Company throughout the lifecycle of their product, from early-stage prototyping through end-use production to end-of-life replacement and other parts needs. It has operations in the United States and Europe.