Minneapolis / St. Paul Business Journal by Katharine Grayson, Staff reporter

BioAmber Inc. on Monday became the third Minnesota company to file an initial public offering this year. What became of the other two?

Bluestem Brands Inc. appears to be well on its way to becoming public. The company will begin selling shares on Wednesday.

The Eden Prairie-based retailer expects its stock to sell at a price of between $14 and $16 per share. Once the IPO is complete, the company will likely rank No. 43 on the Business Journal’s list of Minnesota’s largest publicly traded companies.

The other firm, Maple Plain-based Proto Labs Inc ., has yet to price its shares or say when it expects to begin selling stock. The company, which makes custom plastic parts, filed to raise $100 million through an initial public offering over the summer.

The only Minnesota company to have completed an IPO this year is Kips Bay Medical Inc., which actually filed its paperwork in 2010. Plymouth-based Kips Bay raised $16.5 million in the deal.