Not everything Warren Buffett touches turns to gold, and he'll be the first to admit that he has made many mistakes. He said pretty bluntly in Berkshire Hathaway's most recent shareholder letter, "I make many mistakes." 

And even though he has said that his favorite holding period is forever, that doesn't mean he doesn't know when it's time to say goodbye to either underperforming stocks or those that aren't suitable for his current investing strategies. You don't need to look further than Berkshire's first-quarter 13F filing to see that it closed out four positions and trimmed another eight.

StoneCo (NASDAQ: STNE) is one stock he's holding on to. The Brazil-based fintech has been posting mixed operating results as it tries to grow its business, and its stock is down more than 50% from its first-day closing price in 2018. However, it's up 42% so far in 2023, and its valuation is climbing as well. What does that mean for investors?

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Source Fool.com