In what shakes out to be the largest follow-on stock offering in biopharma history, Revolution Medicines Inc., an oncology company that was the subject of buyout rumors earlier this year, priced 10.56 million shares to raise $1.5 billion just two days after wowing investors with top-line phase III data of its RAS inhibitor daraxonrasib in patients with metastatic pancreatic ductal adenocarcinoma.