 Shares of Voyager Therapeutics Inc. VYGR, -3.52 rocketed 38.9 in premarket trading Wednesday, after closing at a record low in the previous session, after the gene therapy company announced a license option agreement with Pfizer Inc. PFE, -0.24 that could valued at more than 600 million. Trading volume spiked up to 3.9 million shares ahead of the open, which compares with the full-day average of about 173,000 shares. 