Popular stocks aren't always good stocks to own, as counterintuitive as that sounds. Stocks can become hyped up for all sorts of reasons without actually having too much intrinsic value, or they might have massive opportunity, yet come with tons of risk. That doesn't always mean you shouldn't buy them, but you should definitely proceed with caution. For example, consider these five Popular stocks.

Upstart Holdings (NASDAQ: UPST) has been one of the most volatile stocks on the market since it went public, posting astronomical gains before losing more than 90% of them. This year alone, it had gained 420% before shedding 66% of its value. That extreme volatility is a red flag, right there. 

The financial technology company's potential has captured investor attention, but after posting several quarters of phenomenal growth, Upstart has been reporting extreme declines. While its artificial intelligence (AI) model appears to approve more borrowers for loans without adding risk to creditors, the model isn't working as well with sky-high interest rates. 

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Source Fool.com