X0306 4 2020-10-06 0 0001671818 Oncorus, Inc. ONCR 0001691428 UBS Oncology Impact Fund L.P. UBS TRUSTEES (CAYMAN) LTD 5TH FL CAYMAN CORP CENTER 27 HOSPITAL GEORGE TOWN E9 KY1-1106 CAYMAN ISLANDS 0 0 1 0 0001721036 Oncology Impact Fund (Cayman) Management L.P. UBS TRUSTEES (CAYMAN) LTD 5TH FL CAYMAN CORP CENTER 27 HOSPITAL GEORGE TOWN E9 KY1-1106 CAYMAN ISLANDS 0 0 1 0 0001721035 MPM Oncology Impact Management GP LLC C/O MPM ASSET MANAGEMENT LLC 450 KENDALL STREET CAMBRIDGE MA 02142 0 0 1 0 0001687078 MPM Oncology Impact Management LP C/O MPM ASSET MANAGEMENT LLC 450 KENDALL STREET CAMBRIDGE MA 02142 0 0 1 0 Common Stock 2020-10-06 4 C 0 1525348 A 1525348 D Common Stock 2020-10-06 4 C 0 700453 A 2225801 D Common Stock 2020-10-06 4 P 0 151224 15.00 A 2377025 D Series A-1 Preferred Stock 2020-10-06 4 C 0 1525348 0.00 D Common Stock 1525348 0 D Series B Preferred Stock 2020-10-06 4 C 0 700453 0.00 D Common Stock 700453 0 D Each share of Series A-1 Preferred and Series B Preferred Stock automatically converted into shares of Common Stock upon the closing of the Issuer's initial public offering for no additional consideration, on a one-for-one basis, and had no expiration date. The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing member of Oncology GP LLC. The Reporting Persons disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein. /s/ Ansbert Gadicke, managing director of MPM Oncology Impact Management GP LLC, the general partner of MPM Oncology Impact Management LP, the general partner of Oncology Impact Fund (Cayman) Management L.P., the GP of UBS Oncology Impact Fund L.P 2020-10-08 /s/ Ansbert Gadicke, managing director of MPM Oncology Impact Management GP LLC, the general partner of MPM Oncology Impact Management LP, the general partner of Oncology Impact Fund (Cayman) Management L.P. 2020-10-08 /s/ Ansbert Gadicke, managing director of MPM Oncology Impact Management GP LLC 2020-10-08 /s/ Ansbert Gadicke, managing director of MPM Oncology Impact Management GP LLC, the general partner of MPM Oncology Impact Management LP 2020-10-08