 Pandion Therapeutics Inc. started its public life with a bang, as biotechnology companys stock opened 50 above where the upsized initial public offering was priced. The stocks first trade was at 27 at 11:59 a.m. Eastern for 252,125 shares, compared with the 18 IPO price, which was above the expected range. With about 27.99 million shares outstanding after the IPO, the opening price values the company at about 755.9 million. Pandion went public at a good time for IPOs, as the Renaissance IPO ETF has run up 44.9 over the past three months, while the SP; 500 has gained 12.1. 