On January 13, 2021, MDC Partners Inc. entered into a second supplemental indenture among the Company, the note guarantors party thereto (the Note Guarantors") and The Bambcnk of New York Mellon, as trustee (the Trustee"), which amends and supplements the indenture, dated as of March 23, 2016, (the Original Indenture") among the Company, the Note Guarantors and the Trustee providing for the issuance of 6.500% Senior Notes due 2024 of the Company (the Notes"), as supplemented by a first supplemental indenture, dated as of September 16, 2020 (the First Supplemental Indenture," and together with the Original Indenture, the Indenture"). The Second Supplemental Indenture amends the terms of the Indenture and the Notes by increasing the rate of interest payable in respect of the Notes from 6.500% to 7.500% with effect from December 21, 2020 on the terms described in the Second Supplemental Indenture.