Warren Buffett knows how to keep a secret. He went months without identifying the "mystery stock" he began quietly adding to Berkshire Hathaway's portfolio in mid-2023. Berkshire secured U.S. Securities and Exchange Commission (SEC) approval to keep the purchases under wraps.

However, Berkshire spilled the beans in May. The giant conglomerate revealed that it had accumulated a 6.4% stake in property and casualty insurer Chubb (NYSE: CB) worth more than $6.7 billion at the end of the first quarter of 2024. It's now Berkshire's 10th-largest holding.

Chubb has been a big winner over the last 12 months, with its shares soaring nearly 40%. Should you buy Buffett's high-flying mystery stock?

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Source Fool.com