A no-revenue, high-risk tech bet rivaling social By: CNBC.com News March 14, 2014 at 08:00 AM EDT What technology niche is attracting a ton of IPO buzz for companies that don't generate a cent of revenue? Think it's social media? Think again. Read More >> Related Stocks: Astrazeneca Plc ADR Dicerna Pharmaceutic Google, Inc. Regeneron Pharmaceuticals Renaissance IPO ETF Revance Therapeutics Ultragenyx Pharmaceu Xencor Inc