X0306 4 2020-11-03 0 0001604477 SQZ Biotechnologies Co SQZ 0001021944 Temasek Holdings (Private) Ltd 60B ORCHARD ROAD, #06-18 TOWER 2 THEATRIUM@ORCHARD SINGAPORE U0 233891 SINGAPORE 0 0 1 0 Common Stock 2020-11-03 4 C 0 1888924 A 1888924 I See note Common Stock 2020-11-03 4 P 0 625000 16.00 A 2513924 I See note Series D Preferred Stock 2020-11-03 4 C 0 1888924 0.00 D Common Stock 1888924 0 I See note The Series D Preferred Stock automatically converted into Common Stock on a 1:1 basis upon the closing of the Issuer's initial public offering and had no expiration date. The shares are held of record by Elbrus Investments Pte. Ltd. ("Elbrus"). Elbrus is a direct wholly owned subsidiary of Temasek Life Sciences Private Limited, which in turn is a direct wholly owned subsidiary of Fullerton Management Pte Ltd, which in turn is a direct wholly owned subsidiary of Temasek Holdings (Private) Limited ("Temasek"). Therefore, Temasek may be deemed to beneficially own the shares held of record by Elbrus. The shares are held of record by V-Sciences Investments Pte Ltd. ("V-Sciences"). V-Sciences is a direct wholly owned subsidiary of Temasek Life Sciences Private Limited, which in turn is a direct wholly owned subsidiary of Fullerton Management Pte Ltd, which in turn is a direct wholly owned subsidiary of Temasek Holdings (Private) Limited ("Temasek"). Therefore, Temasek may be deemed to beneficially own the shares held of record by V-Sciences. TEMASEK HOLDINGS (PRIVATE) LIMITED By: /s/ Gregory Tan, in his capacity as Authorized Signatory 2020-11-05