X0306 4 2020-10-06 0 0001671818 Oncorus, Inc. ONCR 0001134655 GADICKE ANSBERT C/O MPM ASSET MANAGEMENT LLC 450 KENDALL STREET CAMBRIDGE MA 02142 0 0 1 0 Common Stock 2020-10-06 4 C 0 1783879 A 1899702 I See footnote Common Stock 2020-10-06 4 C 0 1525348 A 1525348 I See footnote Common Stock 2020-10-06 4 C 0 775975 A 2675677 I See footnote Common Stock 2020-10-06 4 C 0 700453 A 2225801 I See footnote Common Stock 2020-10-06 4 P 0 173776 15.00 A 2849453 I See footnote Common Stock 2020-10-06 4 P 0 151224 15.00 A 2377025 I See footnote Series A-1 Preferred Stock 2020-10-06 4 C 0 1783879 0.00 A Common Stock 1783879 0 I See footnote Series A-1 Preferred Stock 2020-10-06 4 C 0 1525348 0.00 A Common Stock 1525348 0 I See footnote Series B Preferred Stock 2020-10-06 4 C 0 775975 0.00 A Common Stock 775975 0 I See footnote Series B Preferred Stock 2020-10-06 4 C 0 700453 0.00 A Common Stock 700453 0 I See footnote 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 Reporting Person disclaims beneficial ownership of the securities except to the extent of his or its pecuniary interest therein. The shares are held as follows: 1,382,943 by MPM BioVentures 2014, L.P. ("BV 2014"), 92,239 by MPM BioVentures 2014(B), L.P. ("BV 2014(B)"), 50,164 by MPM Asset Management Investors BV2014 LLC ("AM BV2014"), 224,924 by MPM Sunstates Fund, L.P. ("MPM SunStates"), 33,609 by MPM Asset Management Investors Sunstates Fund LLC ("AM SunStates") and 115,823 by MPM Asset Management LLC ("AM LLC"). MPM BioVentures 2014 GP LLC and MPM BioVentures 2014 LLC ("BV LLC") are the direct and indirect general partners of BV 2014 and BV 2014(B). BV LLC is the manager of AM BV2014. MPM SunStates Fund GP LLC and MPM SunStates GP Managing Member LLC ("SunStates GP") are the direct and indirect general partners of MPM SunStates. SunStates GP is the manager of AM SunStates. Luke Evnin, Ansbert Gadicke and Todd Foley are the managing directors of BV LLC, Luke Evnin and Anbsert Gadicke are the members of AM LLC and Ansbert Gadicke is a member of SunStates GP. 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 shares are held as follows: 2,018,001 by BV 2014, 134,595 by BV 2014(B), 73,199 by AM BV2014, 290,632 by MPM SunStates, 43,427 by AM SunStates and 115,823 by AM LLC. The shares are held as follows: 2,155,108 by BV 2014, 143,740 by BV 2014(B), 78,172 by AM BV2014, 310,251 by MPM SunStates, 46,359 by AM SunStates and 115,823 by AM LLC. The shares are held as follows: 1,382,943 by BV 2014, 92,239 by BV 2014(B), 50,164 by AM BV2014, 224,924 by MPM SunStates and 33,609 by AM SunStates. The shares are held as follows: 635,058 by BV 2014, 42,356 by BV 2014(B), 23,035 by AM BV2014, 65,708 by MPM SunStates and 9,818 by AM SunStates. /s/ Ansbert Gadicke 2020-10-08