04:21 PM EDT, 04/01/2024 (MT Newswires) -- Gritstone Bio ( GRTS ) said late Monday it has started an underwritten public offering of shares and accompanying warrants to purchase shares.

The company did not provide details. TD Cowen and Evercore ISI are the joint book-running managers.

Gritstone shares slumped about 35% in after-hours activity.

Price: 1.53, Change: -0.82, Percent Change: -34.89