KROS ▼ -1.2% - Keros Therapeutics, Inc. $KROS - Form S-3.. $350,000,000 Mixed Shelf Keros Therapeutics shares fell 1.2% today following the company's filing of a Form S-3 registration statement for a $350 million mixed shelf offering. The offering allows the company to issue various types of securities over time, which typically dilutes existing shareholders and signals capital needs. 10-SEP-2026 04:10 PM ET