Schedule 13G Filing by TCG Crossover Entities and Chen Yu for Monte Rosa Therapeutics, Inc.

The Schedule 13G filing reports the beneficial ownership of common stock in Monte Rosa Therapeutics, Inc. by TCG Crossover Fund II, L.P., TCG Crossover GP II, LLC, TCG Crossover Fund III, L.P., TCG Crossover GP III, LLC, and Chen Yu. The filing indicates that these entities and individual collectively own approximately 7.2% of the company's common stock, based on 61,759,350 shares outstanding as of August 1, 2025. The securities are held of record by TCG Crossover II and TCG Crossover III, with TCG Crossover GP II and TCG Crossover GP III acting as general partners. Chen Yu, as the sole managing member of both general partners, may be deemed to share voting and dispositive power over the securities. The filing is made pursuant to Rule 13d-1(c) under the Securities Exchange Act of 1934.