Here is the preliminary prospectus for MODERNA, Inc.
They were aiming to raise $500,000,000 in 2018. They must have a crystal ball. The preliminary prospectus explains the vaccine (they are planning) and their thought process on how they plan to present the product to raise the money.
https://www.sec.gov/Archives/edgar/data/1682852/000119312518323562/d577473ds1.htm