AGREEMENT

EXHIBIT A

AGREEMENT

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of Common Stock of Gritstone bio, Inc.

Date: February 14, 2023				XXXXXXX HEALTHCARE VII, L.P.
				By FHM VII, L.P., its general partner
				By FHM VII, L.L.C., its general partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: February 14, 2023				XXXXXXX HEALTHCARE VII-A, L.P.
				By FHM VII, L.P., its general partner
				By FHM VII, L.L.C., its general partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: February 14, 2023				FHM VII, L.P.
				By FHM VII, L.L.C., its general partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: February 14, 2023				FHM VII, L.L.C.
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: February 14, 2023				XXXXXXX LIFE SCIENCES PUBLIC FUND, L.P.
				By: FHMLSP, L.P., its General Partner
				By: FHMLSP, L.L.C., its General Partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: February 14, 2023				FHMLSP, L.P.
				By: FHMLSP, L.L.C., its General Partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: February 14, 2023				FHMLSP, L.L.C.
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer

Date: February 14, 2023				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx
Date: February 14, 2023				By:		/s/ Xxxxxxx X. Xxxxx
						Xxxxxxx X. Xxxxx
Date: February 14, 2023				By:		/s/ Xxxxx Xxxxx
						Xxxxx Xxxxx
Date: February 14, 2023				By:		/s/ Xxxxxx Xxxxx
						Xxxxxx Every
Date: February 14, 2023				By:		/s/ Xxxxx Xxxxxxx
						Xxxxx Xxxxxxx
Date: February 14, 2023				By:		/s/ Xxxxxx Xxx
						Xxxxxx Xxx
Date: February 14, 2023				By:		/s/ Xxxxx Xxxxx
						Xxxxx Xxxxx
Date: February 14, 2023				*By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, as Attorney-in-Fact

* This Agreement was executed by Xxxxx X. Xxxxxx on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on March 29, 2016.

** This Agreement was executed by Xxxxx X. Xxxxxx on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on August 16, 2021.