Why Is TSMC Stock Rising In Premarket?

• U.S. President Donald Trump’s remarks that the Iran war could end within “two to three weeks” sparked optimism across the market.
• Major chip stocks NVDA, INTC, and AMD gained in Wednesday's premarket.
• TSMC plans to start mass production of 3 nm chips at its second Japan fab in 2028.

U.S.‑listed shares of Taiwan Semiconductor Manufacturing Co. climbed 1.2% in Wednesday’s premarket trading, mirroring gains across the broader chip sector as optimism grew around a potential end to the U.S.–Iran conflict and TSMC’s plans to expand 3-nanometer output from Japan. 

President Donald Trump said during an Oval Office briefing on Tuesday that the U.S. could wrap up its military campaign within two to three weeks, triggering sharp gains across the board in stocks.

Chip stocks jumped. Mega-cap stocks Nvidia, Intel, and Advanced Micro Devices were up around 0.5% in premarket. SanDisk rose 3%, while Micron gained nearly 1%.

Gains were driven by a risk-on macro shift, fresh AI catalysts such as Nvidia’s $2 billion deal with Marvell on Tuesday, and investors opening new positions at the start of a new quarter.

Meanwhile, TSMC plans to begin installing equipment and mass-produce 3 nm chips at its second Japanese fab in 2028, aiming for a monthly output of 15,000 12-inch wafers, Reuters reported.  This marks a shift from earlier, less-advanced technologies for the fabs in the region. TMSC’s ⁠first fab plant in Japan started volume production in late 2024. 

On Stocktwits, retail sentiment for TSMC shifted to ‘neutral’ from ‘bearish,’ with several users posting about adding to their positions.

“Smart Money Watching. Price dipped to $316.50, but order flow suggests a key pivot forming. Buyers stepping in quietly, tape looks healthy. Accumulation indicates potential for a bounce,” a user said.

As of the last close, TSMC shares were up 8.3% year to date.

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