MediaTek hit the limit-up for multiple days, forcing the “closed-door” punishment; today it was listed as a disposal stock, opening down nearly 4%.

MediaTek (2454) has shown strong momentum in its recent stock performance. After the earnings call, good news has kept coming one after another. In just two weeks, the stock has hit limit-up for six sessions. It has been designated as a “disposal stock” by the Taiwan Stock Exchange. The disposal period runs from May 7, 2026 to May 20, covering a total of ten business days. During this period, the way trades are matched for MediaTek will change from the original trade-by-trade matching to manual order matching about once every five minutes. At the same time, for orders that reach a certain transaction quantity, the exchange will implement a prepayment for securities measure. Driven by this news, MediaTek opened sharply lower today, dropping nearly 4%, falling back below 3,300 yuan.

Market backdrop of MediaTek being designated as a disposal stock

MediaTek’s stock has been performing strongly recently, with good news continuing after the earnings call. In just two weeks, it has hit limit-up for six sessions. As a key company in Taiwan’s semiconductor industry, its overall market capitalization has surpassed NT$5.5 trillion, firmly maintaining its position as the third-largest weighted stock on the Taiwan stock market.

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Because MediaTek (2454) hit the Taiwan Stock Exchange’s “announce and pay attention to trading information” threshold for three consecutive business days, it was listed as a disposal stock. The disposal period runs from May 7, 2026 to May 20, for a total of ten business days, with the aim of helping the market return to a rational evaluation of its fundamentals. This is also the largest market-cap company ever to be designated as a disposal stock in Taiwan’s stock market history.

Breakdown of the disposal stock mechanism

The so-called disposal stock refers to when a given security’s trading conditions become abnormal and overheated—for example, when daily price-change limits are exceeded for multiple consecutive days, trading volume grows abnormally, or the intraday trading (day trading) ratio becomes too high. The Taiwan Stock Exchange launches this kind of market cooling mechanism, commonly called “putting a company under lockdown.” During MediaTek’s disposal period, the trading system will switch to call auction matching conducted about once every five minutes instead of continuous matching. In addition, to manage the risk of default delivery and settlement, if an investor’s single order is 10 lots (inclusive) or more, or the investor’s cumulative orders in a single day reach 30 lots (inclusive) or more, the securities firm must collect all buy-side funds or sell-side securities in advance. These measures will directly raise the time and capital costs for short-term trading.

Impact on market liquidity and investment considerations

Implementing a disposal mechanism typically has a significant impact on the stock’s short-term liquidity, and trading volume is expected to shrink due to longer matching intervals and the prepayment-for-securities rules. For investors, MediaTek can still be bought and sold normally during the disposal period, but they must adapt to lower trading efficiency and stricter capital requirements. From a long-term investment perspective, disposal measures are only changes to short-term trading rules and do not affect the company’s real operational value. However, in situations where reduced liquidity may increase the risk of worse execution prices, investors should be more cautious when participating in trades.

This article, “Forced ‘lockdown’ after multiple limit-up days for MediaTek; designated as a disposal stock, opened down nearly 4% today,” first appeared on ABMedia News Chain.