Impinj, Inc., which is a leading provider of radio-frequency identification solutions used for locating items, filed on Thursday with the SEC to raise up to $100 million in an initial public offering. The Seattle, WA-based company, which was founded in 2000, booked $39 million in sales for the 12 months ended March 31, 2011. Morgan Stanley and J.P. Morgan are the lead underwriters on the deal. No pricing terms were disclosed.