Last week, I took some time to study Berkshire Hathaway's quarterly 13F filing, a regulatory report that shows what stocks institutional investors are buying and selling. In the case of Berkshire, I was curious to see what its leader, Warren Buffett, had been up to during the past few months.

During the second quarter, some of Buffett's more headline-grabbing moves included trimming his position in Apple by nearly half as well as completely exiting artificial intelligence (AI) software company Snowflake.

However, he made another investment that puzzled me at first glance. The Oracle of Omaha's company purchased 96.2 million shares in satellite radio service Sirius XM (NASDAQ: SIRI), increasing his position by 262%.

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Source Fool.com