Proto Labs, a manufacturer of custom prototype and low-volume plastic parts, filed on Monday with the SEC to raise up to $100 million in an initial public offering. Proto Labs has established operations in the US, Europe and Japan, with sales outside of the US accounting for 26% of sales in the year ended December 2010. The Maple Plain, MN-based company, which was founded in 1999 and booked $74 million in sales for the 12 months ended March 31, 2011, plans to list on the NASDAQ under the symbol PRLB. Jefferies & Co. and Piper Jaffray are the lead underwriters on the deal. No pricing terms were disclosed.
