X0306 4 2022-06-30 0 0001789972 Cullinan Oncology, Inc. CGEM 0001731193 AHMED NADIM C/O CULLINAN ONCOLOGY, INC. ONE MAIN STREET, SUITE 520 CAMBRIDGE MA 02142 1 1 0 0 President and CEO Common Stock 2022-06-30 4 A 0 1620 10.90 A 9710 D The reporting person is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the Issuer's 2021 Employee Stock Purchase Plan (the "ESPP"), for the purchase period of January 1, 2022 through June 30, 2022. This transaction is also exempt under Rule 16b-3(c). In accordance with the ESPP, the shares were purchased based on 85% of the closing price of the Issuer's common stock on June 30, 2022. /s/ Jeffrey Trigilio, Attorney-in-Fact 2022-07-05