Gritstone bio Takes Action to Preserve Value and Strengthen Capital Structure

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Voluntarily Files for Chapter 11 Restructuring

Strategic Alternatives Process Continues with Interest from Parties

EMERYVILLE, Calif., October 10, 2024--(BUSINESS WIRE)--Gritstone bio, Inc. (Nasdaq: GRTS) ("Gritstone" or the "Company"), a clinical-stage biotechnology company working to develop the world’s most potent vaccines, today announced it has filed a voluntary petition under chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the District of Delaware.

Gritstone intends to use the court-administered restructuring process to preserve value and support its ongoing strategic alternatives process. The Company is in discussions with a party to act as a stalking horse bidder or plan sponsor and intends to present an agreement to the Court as early as next week in order to enter into a value-maximizing transaction and continue to research and develop its next-generation vaccines and immunotherapies for oncology and infectious diseases.

"Our world-class science and cutting-edge innovations have positioned us at the forefront of oncology and medical breakthroughs. We recently reported encouraging interim Phase 2 data from our ongoing study evaluating GRANITE, which continues to demonstrate an emerging benefit for patients, however, additional time is needed for the data to mature," said Andrew Allen, MD, PhD, Co-founder, President & CEO of Gritstone. "The decision to file for chapter 11 relief allows us to stay focused on our mission of bringing potentially life-saving treatments like GRANITE to patients around the world."

During its financial restructuring process, Gritstone intends to operate in the ordinary course and remains committed to advancing its clinical programs, including its ongoing neoantigen immunotherapy and infectious disease programs, and driving innovation in immunotherapy and vaccine development.

Gritstone is filing customary "first day" motions in its chapter 11 case with the intention of ensuring normal operations. Upon court approval of these first day motions, Gritstone intends to minimize the impact of the bankruptcy process on the Company's vendors, employees, and other key stakeholders.

Additional information regarding Gritstone’s chapter 11 process is available at https://www.veritaglobal.net/gritstone. Stakeholders with questions may call the Company’s Claims Agent, Verita Global, at 877-709-4754 or 424-236-7233 if calling from outside the U.S. or Canada, or send an inquiry by visiting https://www.veritaglobal.net/gritstone/inquiry.