Impinj, Inc. announced the launch of a proposed follow-on public offering of 3,515,869 shares of its common stock, which will include 1,000,000 shares to be offered by Impinj and 2,515,869 shares to be offered by certain selling stockholders. Impinj will not receive any proceeds from the sale of the shares by the selling stockholders. In addition, Impinj expects to grant the underwriters a 30-day option to purchase up to an additional 527,380 shares of its common stock.   Morgan Stanley, RBC C...