Moderna (MRNA) Soared 177% on a Cancer Vaccine…

Moderna (NASDAQ: MRNA) closed up about 177% on Wednesday, August 19, at $174.38, its largest one-day gain on record, after the company and Merck (NYSE: MRK) reported the first-ever positive Phase 3 result for an mRNA-based cancer vaccine . The move added roughly $44 billion in market value in a single session, taking Moderna from about $25 billion to $69 billion. By Thursday's pre-market the stock…