Impinj to make IPO

SEATTLE — A company that makes tracking technology for retailers and drug companies is making an initial public offering.

Seattle-based Impinj, which makes ultra-high-frequency radio-frequency identification tags, made the announcement Thursday, saying it had filed a registration statement with the Securities and Exchange Commission relating to a proposed IPO.

Impinj’s tags, which are cheaper and smaller than regular RFID tags, are used by retailers to track inventory and by drug companies to keep counterfeit drugs out of the supply chain.