[www.umc.com Description 99.1 Announcement on 2020/09/01: UMC will attend investor conferences on 2020/09/08 99.2 Announcement on 2020/09/09: August Revenue 99.3 Announcement on 2020/09/15: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC 1 UMC ]

[UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES CONSOLIDATED FINANCIAL STATEMENTS FOR THE SIX-MONTH PERIODS ENDED JUNE 30, 2020 AND 2019 Address: No. 3 Li-Hsin Road II, Hsinchu Science Park, Hsinchu City, Taiwan, R.O.C. Telephone: 886-3-578-2258 The reader is advised that these consolidated fin]

[www.umc.com Description 99.1 Announcement on 2020/08/07: Announcement of the completion of the 21th stock buy-back plan by the company 99.2 Announcement on 2020/08/11: Represent major subsidiary HEJIAN TECHNOLOGY (SUZHOU) CO., LTD to announce the resolution of Extraordinary Shareholders’ Meeting 99.]

[www.umc.com Description 99.1 Announcement on 2020/07/29: The board meeting approved capital budget execution 99.2 Announcement on 2020/07/29: UMC announced its operating results for the second quarter of 2020 1 The board meeting approved capital budget execution 1. Date of the resolution of the boar]

[www.umc.com Description 99.1 Announcement on 2020/07/01: To announce related materials on acquisition of intangible assets 99.2 Announcement on 2020/07/17: UMC will convene Q2 2020 Investor Conference 99.3 Announcement on 2020/07/17: To announce accumulative shares repurchased exceeding NTD$300 mill]