 Nkarta Inc. priced its initial public offering Friday at 18 a share, above its price range of 16 to 17, selling 14 million shares to raise about 252 million. The company upsized the deal on Thursday and raised the price range from a prior plan to offer 10 million shares priced at 14 to 16 a share. Cowen, Evercore ISI, Stifel and Mizuho Securities are the joint bookrunning managers of the IPO. The stock is expected to start trading on Nasdaq later Friday under the ticker symbol NKTX. Nkarta is looking to go public at a time that the Renaissance IPO ETF has soared 61.7 over the past three months, while the iShares Nasdaq Biotechnology ETF has climbed 23.6 and the SP; 500 has advanced 13.6. 