UMC SEC Filing News — United Microelectronics Corporation

Latest SEC filings for United Microelectronics Corporation (UMC) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). All data sourced directly from SEC EDGAR — last updated 2026-07-13.

United Microelectronics Corporation operates as a semiconductor wafer foundry in Taiwan, China, Hong Kong, Japan, Korea, the United States, Europe, and internationally. It manufactures and sells integrated circuits. The company offers circuit design; mask tooling; wafer fabrication; and assembly and testing services for communication devices, consumer electronics, computer, and other applications. It also provides venture capital and marketing support; consulting and planning; energy technical; …
Sector: Technology Industry: Semiconductors Market Cap: $53.3B CIK: 1033767
2
Total Filings
0
Bullish Signals
2
Bearish Signals
2
Insider Transactions
0
Material Events (8-K)
0
Periodic Reports
Insider activity for UMC has skewed bearish recently. Of the 2 filings tracked, 2 carry bearish signals (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
Recent SEC Filings
Form 4 Insider Selling 2026-07-13

UMC insider Liu Chitung (CFO & SVP) sold 1,900,000 shares (~$294.29M)

Liu Chitung, listed as CFO & SVP at UNITED MICROELECTRONICS CORP, reported an open-market sale of 1,900,000 UMC shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: Liu Chitung (CFO & SVP) Shares: 1,900,000 Est. Value: $294.29M
View on SEC EDGAR → Open Filing Document →
Form 4 Insider Selling 2026-06-30

UMC insider HU CHE-JEN (Vice President) sold 10,000 shares (~$1.71M)

HU CHE-JEN, listed as Vice President at UNITED MICROELECTRONICS CORP, reported an open-market sale of 10,000 UMC shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: HU CHE-JEN (Vice President) Shares: 10,000 Est. Value: $1.71M
View on SEC EDGAR → Open Filing Document →

Understanding United Microelectronics Corporation's SEC Filings

Form 4 — Insider Transactions

Executives, directors, and large shareholders must report any purchase or sale of UMC shares within two business days. Consistent buying by multiple insiders is often read as a confidence signal; large sales may reflect diversification or liquidity needs rather than negative conviction.

Form 144 — Proposed Insider Sales

Filed when a company affiliate intends to sell restricted or control shares. A Form 144 is a notice of intent, not confirmation — the actual sale is later confirmed via Form 4. It gives investors advance visibility into planned insider selling activity.

8-K — Material Events

The 8-K is an event-driven filing that United Microelectronics Corporation must submit within four business days of a significant development — including earnings results, mergers, executive changes, credit facility updates, or regulatory actions. Each 8-K item code maps to a specific event type.

10-Q & 10-K — Periodic Reports

The 10-Q (quarterly) and 10-K (annual) are comprehensive reports covering United Microelectronics Corporation's financial results, risk factors, management discussion, and business operations. The 10-K includes audited financials and is the most complete public disclosure the company makes each year.

Frequently Asked Questions — UMC SEC Filings

What SEC filings does United Microelectronics Corporation submit to the SEC?

United Microelectronics Corporation (UMC) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about UMC?

A Form 4 for UMC discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the date, number of shares bought or sold, the price, and the insider's updated total ownership. Consistent insider buying across multiple executives is often interpreted as a bullish signal.

How do I interpret an 8-K filing from United Microelectronics Corporation?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for UMC?

The 10-K is United Microelectronics Corporation's annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all UMC SEC filings directly on EDGAR?

You can view all historical United Microelectronics Corporation filings on the SEC EDGAR company page for UMC. Each filing card on this page links directly to the original SEC document.

How often does United Microelectronics Corporation file with the SEC?

United Microelectronics Corporation files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling UMC shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

More Tools for UMC

UMC Full Stock Analysis UMC Live Chart Institutional Ownership Earnings Calendar Options Flow Scanner Demand Zone Analyzer Sector Scanner Browse All Stocks

Want deeper UMC analysis?

View valuation, growth metrics, AI Strong Buy score, demand zones, peer comparison, and more — all on the UMC stock analysis page.

UMC Full Analysis
SEC filing data is sourced from SEC EDGAR. This page is updated automatically as new filings are detected. Content is for informational purposes only and does not constitute investment advice. Full Disclaimer.