Viridian Therapeutics, Inc.\DE

We are party to a multi-year, non-cancelable lease agreement for our office space in Waltham, Massachusetts (as subsequently amended in July 2021, April 2022, July 2022, April 2024, September 2024 and September 2025, the “Massachusetts Lease”). In April 2024, we entered into a fourth amendment to the Massachusetts Lease (the “Fourth Amendment”). The Fourth Amendment makes certain modifications to the Massachusetts Lease, including (i) securing 10,427 sq. ft. of office space in the same building (the “New Premises”), (ii) the termination of the 10,956 sq. ft. of leased space under the Massachusetts Lease (the “Original Premises”), and (iii) the extension of the expiration date of the New Premises to July 2029. Under the Fourth Amendment, we have the option to extend the lease term for an additional period of three years upon notice to the landlord. In September 2024, we entered into a fifth amendment to the Massachusetts Lease (the “Fifth Amendment”). The Fifth Amendment makes certain modifications to both the Massachusetts Lease and the Fourth Amendment, including the addition of 2,788 sq. ft. of office space in the same building (the “September 2024 Expansion Premises”). In September 2025, we entered into the sixth amendment to the Massachusetts Lease (the “Sixth Amendment”). The Sixth amendment makes certain modifications to the Massachusetts Lease, including the addition of 5,240 sq. ft. of office space in the same building (the “September 2025 Expansion Premises”).

Additionally, we leased approximately 27,128 sq. ft. of office and laboratory space in Boulder, Colorado under a lease that expired in December 2024. In September 2024, we entered into a new, multi-year lease agreement for 7,117 sq. ft. of office and laboratory space in Boulder, Colorado that expires in December 2026. We have the option to extend the lease term for an additional period of five years upon notice to the Landlord.