Entry into a Material Definitive Agreement.

On September 16, 2021, Gritstone bio, Inc. (the "Company") reported that it entered into a Securities Purchase Agreement (the "Purchase Agreement") with certain purchasers identified on the signature pages thereto (the "Purchasers"), pursuant to which the Company issued and sold to the Purchasers, in an unregistered offering, an aggregate of 5,000,000 shares of common stock, par value $0.0001 per share (the "Common Stock") at a per share purchase price of $11.00 per share, for aggregate gross proceeds to the Company of $55.0 million (the "Private Placement"). The closing of the Private Placement occurred on September 17, 2021 (the "Closing") (Filing, 8-K, Gritstone Oncology, SEP 16, 2021, View Source [SID1234587887]).

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Pursuant to the Purchase Agreement, the Company has agreed to file a resale registration statement with the Securities and Exchange Commission as soon as practicable, and in all events within 30 days after the Closing, to register the resale of the Securities issued at the time of the Closing.

Cowen & Company LLC acted as sole placement agent for the Private Placement.

The foregoing summaries of the Private Placement, the Shares to be issued in connection therewith, and the Purchase Agreement are qualified in their entirety by reference to the definitive transaction documents. A copy of the Purchase Agreement is attached hereto as Exhibit 10.1 and is incorporated herein by reference.