Material Agreement - Form 8-K

On April 10, 2024, Viridian Therapeutics, Inc. (the "Company") entered into a Fourth Amendment to Lease Agreement (the "Amendment"), effective April 8, 2024, with Watch City Ventures MT, LLC ("Landlord"), to amend that certain Lease, dated January 13, 2020, by and between the Company and Landlord (the "Lease"), as amended on July 6, 2021, April 13, 2022 and July 29, 2022, for the lease of an aggregate of 10,956 square feet of rentable area of the building located at 221 Crescent Street, Waltham, Massachusetts (the "Original Premises"), which serves as the Company's headquarters.

The Amendment (i) terminates the lease of the Original Premises and replaces it with 10,427 rentable square feet in a different suite at the same address as the Original Premises (the "New Premises") and (ii) extends the term of the Lease by five years following the New Premises Rent Commencement Date (as defined in the Amendment) (the "Extended Term"), among other things. The base rent payable for the New Premises by the Company during the Extended Term will be $38,232.33 per month for the first year of the Extended Term, which amount will increase by approximately 2.0% per year over the Extended Term.

Pursuant to the Amendment, the Company is also entitled to (i) a tenant improvement allowance in an amount not to exceed $104,270, (ii) a three-year extension option and (iii) an ongoing right of first refusal for additional space at the same address. The Amendment also amends the Company's Proportionate Share (as defined in the Lease), of certain operating costs and tax expenses.

The foregoing description of the Amendment does not purport to be complete and is subject to, and qualified in its entirety by reference to, the full text of the Amendment. The Company intends to file a copy of the Amendment with the Company's Quarterly Report on Form 10-Qfor the quarter ended June 30, 2024.