Impinj, Inc. announced the closing of a $21 million equity financing led by a broad set of existing investors, including AllianceBernstein L.P., ARCH Venture Partners, GF Private Equity Group, Intel Corporation, Madrona Venture Group, Mobius Venture Capital and Polaris Venture Partners to expand sales, marketing, product development and manufacturing operations in response to the rapidly growing demand for UHF RFID products globally. By mid-August, the company expects to sell additional shares t...