Nkarta Inc. /zigman2/quotes/219228443/composite NKTX +0.45% 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 /zigman2/quotes/207665280/composite IPO +1.12% has soared 61.7% over the past three months, while the iShares Nasdaq Biotechnology ETF /zigman2/quotes/206189322/composite IBB +1.46% has climbed 23.6% and the S&P 500 /zigman2/quotes/210599714/realtime SPX +1.40% has advanced 13.6%.