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United Microelectronics Corporation announced on 2026-03-26 that, pursuant to the Holding Foreign Insiders Accountable Act enacted December 18, 2025, its directors and officers must disclose ownership and transactions in Company equity securities under Section 16(a) of the U.S. Securities Exchange Act of 1934 effective March 18, 2026. Disclosures are available on the SEC’s EDGAR website.