Two New Biotech IPOs Debut Friday, One Deal Delayed By: Benzinga via Benzinga January 29, 2015 at 13:47 PM EST Although Spark Therapeutics Inc (NASDAQ: ONCE) and Shake Shack Inc (NYSE: SHAK) are the most hyped deals of the week, there are two ... Read More >> Related Stocks: Renaissance International IPO ETF Shake Shack Inc Spark Therap Tracon Pharmaceuticals Inc