Are insiders buying UMC?

This page tracks SEC Form 4 open-market insider purchases for UMC. We surface a cluster when 2 or more distinct insiders buy within 90 days.

What is an insider cluster buy?

A cluster buy is when two or more distinct company insiders make open-market purchases (SEC Form 4, transaction code P) of the same stock within a short window. Multiple insiders buying at once is a stronger conviction signal than a single purchase.

Where does InsiderCluster get insider data?

Directly from SEC EDGAR Form 4 filings. We track open-market purchases (code P); price and sentiment come from Yahoo Finance and StockTwits.

UMC

NYSE

United Microelectronics Corporation

$19.03

▲ 0.09 (+0.48%)

Price

-4.80% over 1D

Key statistics

Previous close$18.94

Day range18.82 – 20.08

52-week range6.56 – 28.96

Volume16.73M

CurrencyUSD

ExchangeNYSE

Crowd sentiment

91Bullish

Insider activity

SEC EDGAR ↗

Open-mkt buys

$0.00

Open-mkt sells

$296,004,000.00

Net flow

−296M

2 open-market trades

Showing 2 recent filings. 0 other (grants, option exercises, gifts, tax withholding) are listed below but excluded from buy/sell flow.

Insider	Type	Shares	Price	Value	Date
Liu Chitung CFO & SVP	Sell (open market)	1.9M	$154.89	$294,291,000.00	2026-07-13
HU CHE-JEN Vice President	Sell (open market)	10K	$171.30	$1,713,000.00	2026-06-30