Calithera BioSciences Inc. closed its underwritten public offering of 7,854,500 common shares at $10.25 apiece.

The shares sold include the full exercise of the underwriters' option to buy 1,024,500 additional shares.

The offering generated gross proceeds of about $80.5 million.

Leerink Partners acted as sole book-running manager for the offering. Wells Fargo Securities acted as lead manager, while JMP Securities acted as co-manager for the offering.