X0306 4 2021-06-28 0 0001826457 Monte Rosa Therapeutics, Inc. GLUE 0001687880 Versant Venture Capital VI, L.P. ONE SANSOME STREET, SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777654 Versant Ventures VI GP, L.P. ONE SANSOME STREET, SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777652 Versant Ventures VI GP-GP, LLC ONE SANSOME STREET, SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001765253 Versant Vantage I, L.P. ONE SANSOME STREET, SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777651 Versant Vantage I GP, L.P. ONE SANSOME STREET, SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777653 Versant Vantage I GP-GP, LLC ONE SANSOME STREET, SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 Common Stock 2021-06-28 4 C 0 6515869 A 6799115 D Common Stock 2021-06-28 4 C 0 1940043 A 1940043 I By Versant Vantage I, L.P. Common Stock 2021-06-28 4 P 0 157895 19.00 A 2097938 I By Versant Vantage I, L.P. Series A convertible preferred stock 2021-06-28 4 C 0 20004280 D Common Stock 5666131 0 D Series B convertible preferred stock 2021-06-28 4 C 0 3000000 D Common Stock 849738 0 D Series B convertible preferred stock 2021-06-28 4 C 0 4150000 D Common Stock 1175470 0 I By Versant Vantage I, L.P. Series C convertible preferred stock 2021-06-28 4 C 0 2699328 D Common Stock 764573 0 I By Versant Vantage I, L.P. Each share of Series A convertible preferred stock, Series B convertible preferred stock and Series C convertible preferred stock (collectively, the "Preferred Stock") was convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering. The Preferred Stock converted into Common Stock on a 3.5305-for-one basis upon the closing of the Issuer's initial public offering without payment or additional consideration. The Preferred Stock had no expiration date. Shares held by Versant Venture Capital VI, L.P. ("Versant VI"). Versant Ventures VI GP, L.P. ("Versant Ventures VI GP") is the general partner of Versant VI, and Versant Ventures VI GP-GP, LLC ("Versant Ventures VI GP GP") is the general partner of Versant Ventures VI GP. Bradley J. Bolzon, a member of the Issuer's board of directors, is a managing member of Versant Ventures VI GP-GP and may be deemed to share voting and dispositive power over the shares held by Versant VI. Each of Versant Ventures VI GP, Versant Ventures VI GP-GP and Bradley J. Bolzon disclaim beneficial ownership of such securities, except to the extent of their pecuniary interests therein. Bradley J. Bolzon is a director of the Issuer and, accordingly, files separate Section 16 reports Shares held by Versant Vantage I, L.P. ("Versant Vantage I"). Versant Vantage I GP, L.P. ("Versant Vantage I GP") is the general partner of Versant Vantage I, and Versant Vantage I GP-GP, LLC ("Versant Vantage I GP-GP") is the general partner of Versant Vantage I GP. Bradley J. Bolzon is a managing member of Versant Vantage I GP-GP and may be deemed to share voting and dispositive power over the shares held by Versant Vantage I. Each of Versant Vantage I GP, Versant Vantage I GP-GP and Bradley J. Bolzon disclaim beneficial ownership of such securities, except to the extent of their respective pecuniary interests therein. Bradley J. Bolzon is a director of the Issuer and, accordingly, files separate Section 16 reports. Versant Venture Capital VI, L.P. By: Versant Ventures VI GP, L.P. Its: General Partner By: Versant Ventures VI GP-GP, LLC By: /s/ Robin L. Praeger Its: Managing Director 2021-06-30 Versant Ventures VI GP, L.P., By: Versant Ventures VI GP-GP, LLC By: /s/ Robin L. Praeger Its: Managing Director 2021-06-30 Versant Ventures VI GP-GP, LLC By: /s/ Robin L. Praeger Its: Managing Director 2021-06-30 Versant Vantage I, LP By: Versant Vantage I GP, L.P. Its: General Partner By: Versant Vantage I GP-GP, LLC Its: General Partner By: /s/ Robin L. Praeger Its: Managing Director 2021-06-30 Versant Vantage I GP, L.P., By: Versant Vantage I GP-GP, LLC Its: General Partner By: /s/ Robin L. Praeger Its: Managing Director 2021-06-30 Versant Vantage I GP-GP, LLC, By: /s/ Robin L. Praeger Its: Managing Director 2021-06-30