Private Placement, Corporate Action, Amendments to Bylaws (Form 8-K)

TransCode Secures Exclusive, Worldwide, Fully Paid-Up Royalty-Free License to Develop and Commercialize a Next-Generation Oncolytic Immunotherapy Platform in an All-Stock Transaction Underscoring the Company's Dedication to Improving the Lives of Cancer Patients

BOSTON, March 3, 2026 - TransCode Therapeutics, Inc. (NASDAQ: RNAZ), a clinical stage company pioneering immuno-oncology and RNA for the treatment of high risk and advanced cancer, today announced that it has entered into an exclusive, worldwide, fully paid-up royalty-free license agreement with Unleash Immuno Oncolytics, Inc. ("Unleash"). TransCode obtained the rights to develop three Unleash drug candidates, UIO-524, UIO-525 and UIO-526, which includes a license of all in-licensed rights held by Unleash to the Unleash drug candidates together with the acquisition of all rights to the drug candidates owned by Unleash. Under the terms of the exclusive license agreement, Unleash will receive a one-time payment of 1,136,364 shares of a new series of non-voting convertible preferred stock of TransCode, convertible into an equal number of shares of common stock of TransCode (the "Preferred Stock"). The Preferred Stock represents 6.8% of TransCode's common stock on a fully diluted basis assuming conversion of all TransCode preferred stock outstanding.

The lead candidate UIO-524 complements and expands TransCode's oncology pipeline by introducing a next-generation, biology-driven oncolytic immunotherapy platform designed to address solid tumor indications with high-unmet medical need, beginning with muscle-invasive bladder cancer (MIBC).

MIBC is a significant unmet medical need indication with poor outcomes, limited durable treatment options, and a highly immunosuppressive tumor microenvironment. Bladder cancer represents a multi-billion-dollar global market, with muscle-invasive disease accounting for a disproportionate share of treatment intensity and healthcare costs, creating what TransCode believes is a compelling opportunity for differentiated therapeutic approaches.

Dr. Philippe P. Calais, Pharm.D., Ph.D., Chairman and CEO of TransCode, stated that "As we are advancing our lead asset, TTX-MC138, into a clinical Phase 2a trial, expanding our pipeline with an innovative preclinical technology such as UIO-524 provides us with an additional shot on goal using a next generation oncolytic immunotherapy candidate intended to address a large and attractive market in more aggressive settings such as MIBC."

Tungsten Advisors acted as the exclusive financial advisor.

About Unleash and the Licensing Transaction

UIO-524 is a rationally designed oncolytic adenovirus engineered to selectively replicate within both malignant cells and cancer-associated stroma. The virus delivers a multi-cytokine immune-activating payload comprising CD40-L, 4-1BBL, and IL-21, intended to activate dendritic cells, T cells, and NK cells, and to drive a robust, systemic anti-tumor immune response. UIO-524 is regulated by a proprietary SPARC promoter that is highly active in malignant cells and cancer-associated stromal compartments and which enables biology-driven differentiation. This design enables selective viral replication and localized expression of immune-activating cytokines within the tumor microenvironment.

UIO-524 builds on CG Oncology's CG0070, the most clinically advanced and successful oncolytic adenovirus to date, demonstrating meaningful activity in non-muscle-invasive bladder cancer (NMIBC). UIO-524 contains a structurally related oncolytic adenovirus backbone, incorporates tumor- and stroma-targeted replication and contains a more comprehensive, multi-cytokine immune payload. This design positions UIO-524 as a next-generation oncolytic immunotherapy candidate intended to address more aggressive disease settings such as MIBC.

A more detailed description of the financing and licensing agreements can be found in TransCode's Form 8-K filed with the U.S Securities and Exchange Commission.

About TTX-MC138

TTX-MC138 is a first-in-class therapeutic candidate designed to inhibit microRNA-10b, or miR-10b, a microRNA widely believed to be critical to the emergence and progression of many metastatic cancers. TransCode's Phase 0 clinical trial produced evidence of delivery of a radiolabeled version of TTX-MC138 to metastatic lesions and pharmacodynamic activity, even at a microdose of the drug candidate, suggesting a broad therapeutic window for TTX-MC138.

About TransCode Therapeutics

TransCode Therapeutics, Inc. is a clinical stage company pioneering immuno-oncology and RNA for the treatment of high risk and advanced cancer. The company's lead therapeutic candidate, TTX-MC138, is focused on treating metastatic tumors that overexpress microRNA-10b, a unique, well-documented biomarker of metastasis. In addition, TransCode has a portfolio of other first-in-class therapeutic candidates designed to mobilize the immune system to recognize and destroy cancer cells.