UMC CFO Liu Chitung Sells 1.6M Shares for NT$228.8M in Two-Day Open-Market Sale
UMC has more than doubled off its 52-week low of $6.825.
Summary
UMC's CFO sold 1.6 million shares for NT$228.8 million (~US$7.9M) over two days, cutting his direct holdings by about 38% and extending a pattern of insider selling.
Key Events · Ownership and Investor Activity · UMC
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CFO Sells 1.6M Shares
Liu Chitung sold 1,200,000 shares on 2026-09-16 at NT$142.333 and 400,000 shares on 2026-09-17 at NT$145.00, for total proceeds of NT$228,799,600 (~US$7.9M).
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Direct Stake Cut by 38%
Post-transaction direct holdings fell from 4,239,757 to 2,639,757 shares, a reduction of approximately 38%.
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Second Major CFO Sale in 90 Days
Follows the CFO's July 2026 sale of 1.9 million shares for ~$12.3 million, indicating a sustained pattern of insider distribution.
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Indirect Holdings Remain
The CFO retains 150,000 shares indirectly via spouse and 1,000,000 shares in CTBC Bank Trust, plus 1,126,840 restricted stock awards vesting through 2029.
Analysis · UMC · Manufacturing
CFO Liu Chitung sold 1.6 million common shares on September 16–17, 2026, at NT$142.33–145.00 per share, generating NT$228.8 million (approximately US$7.9 million). This is the second large insider sale in recent months — the CFO previously sold 1.9 million shares for ~$12.3 million in July 2026 — and reduces his direct stake by roughly 38%. While the sale represents only 0.409% of UMC's market capitalization, the CFO's repeated liquidation of a substantial portion of his holdings is a notable distribution signal, especially against a backdrop of strong quarterly results and a new US$1.8 billion convertible bond offering approved in August 2026.
How filings like this one have moved
In the 30 days to Nov 2, 2026, 32.7% of the 1910 measured filings Wiseek scored 7 moved their stock by 5% or more by the next session's close. The median move was 0.00%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, UMC was trading at $23.10 on NYSE in the Manufacturing sector, with a market capitalization of approximately $56B. The 52-week trading range was $6.82 to $28.96. This filing was assessed with negative market sentiment and an importance score of 7 out of 10.