Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), the huge conglomerate run by legendary investor Warren Buffett, released its always anticipated 13F filing on Monday afternoon, detailing the company's portfolio moves from the third quarter of the year. We already knew from Berkshire's latest earnings report that it had purchased close to $9 billion in stock and sold $5.3 billion worth in the third quarter. But the 13F, which is required for large institutional investment managers, removes the mystery. Let's take a look.

Arguably the most notable move by Buffett and Berkshire in the quarter was their investment in the world's largest chipmaker, Taiwan Semiconductor Manufacturing Company (NYSE: TSM), also known as TSMC. Berkshire purchased roughly 60.06 million shares in the company, amounting to $4.1 billion at the time of the purchase. That equates to a roughly 1.2% stake in the company.

TSMC is a powerhouse in its own right, but it's also a key supplier for Apple. The consumer tech giant was TSMC's largest customer in 2021 and made up a quarter of the company's revenue last year. This year, that number is expected to be even higher, even as TSMC anticipates more room to grow in other sectors such as the auto market.

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Source Fool.com