Exhibit 1
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 shares of stock of Lyell Immunopharma, Inc.
This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.
Dated: February 14, 2025
ARCH VENTURE FUND IX, L.P.
By: ARCH Venture Partners IX, L.P.
its General Partner
By: ARCH Venture Partners IX, LLC
its General Partner
By: *
Keith Crandell
Managing Director
ARCH VENTURE PARTNERS IX, L.P.
By: ARCH Venture Partners IX, LLC
its General Partner
By: *
Keith Crandell
Managing Director
ARCH VENTURE PARTNERS IX, LLC
By: *
Keith Crandell
Managing Director
ARCH VENTURE FUND IX OVERAGE, L.P.
By: ARCH Venture Partners IX Overage, L.P.
its General Partner
By: ARCH Venture Partners IX, LLC
its General Partner
By: *
Keith Crandell
Managing Director
ARCH VENTURE PARTNERS IX OVERAGE, L.P.
By: ARCH Venture Partners IX, LLC
its General Partner
By: *
Keith Crandell
Managing Director
*
Keith Crandell
*
Robert Nelsen
*
Clinton Bybee
* By: /s/ Mark McDonnell
Mark McDonnell as
Attorney-in-Fact
* This Agreement was executed by Mark McDonnell pursuant to a Power of Attorney filed as Exhibit 24 to the Form 3 relating to the beneficial ownership of shares of Gossamer Bio, Inc. by the Reporting Persons filed with the Securities Exchange Commission on February 7, 2019 and incorporated herein in its entirety by reference.
