apple inc AAPL Offerer Taiwan Semiconductor Manufacturing Co. TSM Shares rose nearly 8% on Tuesday after a billionaire investor Warren Buffett‘s Berkshire Hathaway (NYSE: BRK-A) (NYSE: BRK-B) disclosed a new $4.1 billion stake in the company.

What happened: The Omaha-based conglomerate said in a filing that it acquired about 60.1 million American depository receipts in TSMC in the most recent quarter ended Sept. 30.

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A rare foray into the tech sector by Buffett’s company sent TSMC shares soaring in Taiwan Tuesday after hitting a two-year low last month on a sharp slowdown in global chip demand.

The company also announced other investments: $297 million in a building materials company Louisiana-Pacific Corp. LPX and $13 million Jefferies Financial Group Inc. JEF.

Berkshire also exited an investment in a real estate company Store Capital Corpwho have agreed to go private in September.

This came after the Taiwan-based chip maker, which also resupplies Qualcomm QCOM and Nvidia Corp NVDA, posted an 80% jump in its latest quarterly earnings.

TSMC said so last week it looks for local sources of neon gas after Wladimir PutinThe war in Ukraine caused a major supply crisis. The chipmaker’s senior vice president said it is working with several Taiwan-based gas suppliers to explore local production of neon gas in three to five years.

Buffett was never a fan of tech stocks. But that has changed lately. Apple is by far the largest investment in his company’s $306.2 billion stock portfolio.

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