Fast-growing Proto Labs of Maple Plain said Monday that it plans to raise $100 million through an initial public stock offering.
The company, about 30 minutes west of downtown Minneapolis, has achieved profitability in the last several years thanks to success of its high-margin, fast-turnaround, specialty machined and injection-molded custom parts. The company's customers include product developers and manufacturers around the globe.
Proto Labs earned $4.4 million on sales of $65 million in 2010, according to a registration statement filed Monday with the Securities and Exchange Commission.
Sales were up nearly 50 percent last year. They rose nearly 70 percent, to $22.3 million, in the first quarter of this year.
Proto Labs, which employs about 400, was founded in 1999 by Chief Technical Officer Larry Lukis.
Lukis, 63, had grown frustrated with the time and expense involved in securing prototype molds for the plastic components used in printers that he once designed for the former LaserMaster Technologies.
CEO Brad Cleveland, a veteran engineering and financial executive, joined the development-stage company in 2001.
The offering will be led by Jefferies & Co., Piper Jaffray Cos., William Blair & Co. and Craig-Hallum Capital Group are co-managers for the offering.