United Microelectronics Corp President Jen-Tsung Lin sold 10,000 $UMC shares on September 22, 2026, at $163 per share, an open-market sale totaling $1,630,000. He filed the Form 4 the same day and reported 1,172,140 shares still held after the trade.
The September 22 sale was the latest in a run of open-market sales by $UMC executives. CFO Liu Chitung reported three of them in the same stretch. On July 13, Chitung sold 1,900,000 shares at $154.89 per share for $294,291,000, leaving 3,322,917 shares. On September 16, he sold 1,200,000 shares at $142.333 per share for $170,799,600, leaving 3,039,757 shares. A day later, on September 17, he sold 400,000 shares at $145 per share for $58,000,000, leaving 2,639,757 shares.
Chitung's three sales totaled $523,090,600. Combined with Lin's transaction, the four open-market sales reported since mid-July reached $524,720,600. Lin's sale was the smallest by dollar amount, at $1,630,000, and his per-share price of $163 sat above Chitung's September prices of $145 and $142.333 and his July price of $154.89. The share counts ranged from Lin's 10,000 to Chitung's 1,900,000 on July 13.
The database showed no other $UMC transactions by Lin beyond the September 22 filing. His Form 4 carried a filing date matching the trade date, so the transaction was disclosed without delay. Chitung's filings also carried dates that matched or came within a day of each trade.
Congressional disclosures tied to $UMC in the database were older. Representative Michael T. McCaul reported $UMC transactions in 2019 and 2020. His most recent filing for the ticker was a sale dated March 30, 2020, disclosed on May 6, 2020, 37 days after the trade. Congressional forms disclose bracketed value ranges rather than exact share counts and prices.
$UMC operates in the semiconductor industry. The September 22 sale by Lin and the three earlier sales by Chitung were all open-market transactions, and all four filings were made within a day of the corresponding trade. The database recorded no further $UMC insider transactions beyond these four sales in the period. Chitung's reported ownership moved from 3,322,917 shares after the July 13 sale to 3,039,757 shares after the September 16 sale and to 2,639,757 shares after the September 17 sale.